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13-103176 (2)
1\C.. Al RFrF1Vr:rj CITY 4F NUV 0 7 201' . BY:_... f Federal Allay November 4, 2013 CES NW, Inc Attn: Don Babineau 310 29"' St NE, Suite 101 Puyallup, WA 98372 CITY HALL 33325 8th Avenue South Federal Way, WA 98003-6325 (253) 835-7000 www. cityoffederalway. com RE: Permit #13-103176-00-EN; Federal Way Multifamily 2245 S 333rd St Dear Mr. Babineau, - RESUBMITTED NOV 2.7 2013 CITY OF FEDERAL WAY CDS The Public Works Department has reviewed the materials submitted for the above -referenced project. Prior to approval of the plans, the following shall be addressed: 1) Provide a temporary sediment pond or trap. Since it appears that clearing and grading of the site will occur during the wet season, the pond or trap shall be sized using the KCRTS 10-year, 15- minute peak flows. Provide the appropriate details on the plans, and provide the sizing calculations with your next submittal. 2) Provide temporary swales and/or conveyance system, showing how the runoff will be directed into the pond or trap. This is of particular concern along the western and southern edges of the site, adjacent to the developed properties. 3) Please verify that the new Type 2 CB (CB#1) knockouts can accommodate a 36-inch pipe. Our standards indicate that the maximum knock -out size in a 48-inch Type 2 is 36-inches. The existing 36-inch diameter pipe may not fit the `standard' knockout. 4) The new pipe between CB 1 and CB 2 shall be plain or reinforced concrete pipe. City policy states this for any new pipe that will become ours to maintain. 5) Remove the `leader' note that indicates the roof downspouts are to drain to splashblocks and routed to porous pavement, and identify what appear to be catch basins with short sections of pipe into the Reservoir course under the porous pavement. 6) Bond Quantities Worksheet - Please remove the (Quantity) I Catch basin insert listed under WATER QUALITY (page 2). I assume the insert is intended for sediment control (also listed under SITE STABILIZATION/EROSION CONTROL — page 3). I believe the CB insert listed on page 2 for water quality is intended for oil absorbent inserts allowed for Oil Control for water quality under Section 6.6 of the KCSWDM. Obviously, this will end up changing the bond totals on page 3 as well. Doc. I.D. 29492722047 7) We will still need a street lighting design for the on -site street lights. The private street lights shall be designed to City standards. Copies of these standards and details can be provided upon request. Please revise the plans as necessary, and re -submit 5 copies at. your earliest convenience. If you have any questions, please contact me at (253) 835-2734, or via e-mail at kevin. ep__ ters(�n itmal'fecleralway.c�P Sincerely, (Z,LV.w P - Kevin Peterson Engineering Plans Reviewer KP/mj cc: Project File Day File Doc I.D. 29492722047 RESU BMI-11 TED NOV 11202 CITY OF FEDERAL WAY November 4, 2013 CDS CES NW, Inc Attn: Don Babineau 310 29t` St NE, Suite 101 Puyallup, WA 98372 RE. Permit #13-103176-00-EN; Federal Way Multifamily 2245 S 333rd St Dear Mr. Babineau, The Public Works Department has reviewed the materials submitted for the above -referenced project. Prior to approval of the plans, the following shall be addressed: 1) Provide a temporary sediment pond or trap. Since it appears that clearing and grading of the site will occur during the wet season, the pond or trap shall be sized using the KCRTS 10-year, 15- minute peak flows. Provide the appropriate details on the plans, and provide the sizing calculations with your next submittal. The developed site flows predominantly to the southwest at approximately 2.5% and has a flowpath length of less than 150 feet. Based on these criteria as outlined in Section D.3.3, perimeter protection should be adequate to contain any sediment. Furthermore, due to the small size of the project, site grading will be completed in a very short time period. Also, infiltration is proposed, limiting suitable areas where sediment traps or ponds can be located on a small site. 2) Provide temporary swales and/or conveyance system, showing how the runoff will be directed into the pond or trap. This is of particular concern along the western and southern edges of the site, adjacent to the developed properties. For this project, sheet flow is the best BMP. 3) Please verify that the new Type 2 CB (CB#1) knockouts can accommodate a 36-inch pipe. Our standards indicate that the maximum knock -out size in a 48-inch Type 2 is 36-inches. The existing 36-inch diameter pipe may not fit the `standard' knockout. CB#1 has been revised to a 54-inch diameter to accommodate the existing 36-inch CPM. 4) The new pipe between CB 1 and CB 2 shall be plain or reinforced concrete pipe. City policy states this for any new pipe that will become ours to maintain. Plans revised per comment. 5) Remove the `leader' note that indicates the roof downspouts are to drain to splashblocks and routed to porous pavement, and identify what appear to be catch basins with short sections of pipe into the Reservoir course under the porous pavement. Plans revised per comment. Doc. I.D. 29492722047 6) Bond Quantities Worksheet - Please remove the (Quantity) 1 Catch basin insert listed under WATER QUALITY (page 2). I assume the insert is intended for sediment control (also listed under SITE STABILIZATION/EROSION CONTROL — page 3). I believe the CB insert listed on page 2 for water quality is intended for oil absorbent inserts allowed for Oil Control for water quality under Section 6.6 of the KCSWDM. Obviously, this will end up changing the bond totals on page 3 as well. Worksheet revised per comment. 7) We will still need a street lighting design for the on -site street lights. The private street lights shall be designed to City standards. Copies of these standards and details can be provided upon request. A street lighting design will be submitted separately. Please revise the plans as necessary, and re -submit 5 copies at your earliest convenience. If you have any questions, please contact me at (253) 835-2734, or via e-mail at kevin.peterson@cLtyoffederalway.com Sincerely, Kevin Peterson Engineering Plans Reviewer KP/mj cc: Project File Day File Doc. I.D. 29492722047 CITY OF �. Federal Way September 11, 2013 CES NW, Inc. Attn: Barbara. Napier 310 29"' ST NE, Suite 101 Puyallup, WA 98372 RE. Permit #13-103176-00-EN; Federal Way Multi -family 2245 S 333rd St Dear Ms. Napier, CITY HALL 33325 8th Avenue South Federal Way, WA 98003-6325 (253) 835-7000 www.cityoffederalway.com The Public Works Department has reviewed the materials submitted for the above -referenced project. Prior to approval of the plans, the following shall be addressed: All Sheets — 1) Add the Permit Number (noted above) to the space provided in the City approval block. 2) Revise the project name to Federal Way Multi family. Sheet C 1 — 1) It has been determined that the curb and gutter along the east edge of 241h Ave S, north of the site, should be eliminated. Please revise all plan sheets accordingly. Sheet C2 — 1) Add a note that a separate City permit is required for the demolition of the existing buildings. 2) Add a note in the `WSDOT Right of Way Notes' block — Prior to any work performed within the WSDOT right of way, provide to the City copies of any permits and/or approvals required by WSDOT for the work being performed. (This note should be added to all instances on all sheets where the WSDOT Right of Way Notes are provided.) Sheet C3 - No comments specific to this sheet as this time Sheet C4 — 1) Remove the note that indicates that the roof drains are to drain to the porous pavement. 2) With the addition of curb and gutter along the south edge of S 333`d St, it appears that all storm water runoff will be directed/discharged onto the property adjacent to the west of this project (where currently storm water disperses along that pavement edge). A catch basin should be provided at the west end of the curb and gutter, with a piped conveyance to the downstream conveyance system (either to the structures to the west, or, if grade and utilities don't allow for this connection, the conveyance may have to be directed to the ditch to the northwest). 3) Show 2 City Standard street trees and sod to be planted in the 333`d Planter strip. Street trees to be 2.5 inch caliper, and selected from the list on City detail sheet 3-48 (attached). Doc. I.D. 25089528087 4) Add a note that the existing monument case shall be raised to finish grade subsequent to the completion of the asphalt overlay. 5) Indicate the curb ramp is to be per City Standard Dwg. 3-11 and reference to sheet C7. 6) Show a 25-foot pavement grind at the west end of the overlay on S 333`d St, and indicate a butt - joint. 7) Show a 7-foot wide edge plan where the S 333`d St adjoins 24t" Ave S, and indicate a butt joint. Sheet C5 — 1) There's an existing utility pole in the SW corner of the intersection of 333`d and 24"' Ave S. Please indicate what happens to this pole, since it's location will be within the new roadway pavement. Sheet C6 — 1) On Detail 1, indicate that the saw -cut line is to be located 1-foot in to the existing edge of pavement. 2) Show the 3-foot dimension as `R-O-W Dedication'. 3) Revise the Class B pavement to HMA CL 1/z", PG 64-22. Sheet C7, C8, and C9 — No comments specific to these sheets at this time Other — 1) The street lights on the private roadway will be privately owned and maintained, however, the design shall be per City Standards. Please have an engineer with the electrical design capability provide a street light design, and submit the design to the City for review. The `first' (most northerly) street light should be located as close to the intersection as possible, while still located on the private property. 2) A performance/maintenance bond shall be provided for all street improvements within S 333`d St (including the asphalt overlay), as well as for all on- and off -site TESC measures. Please complete and return the enclosed Bond Quantities Worksheet, along with the completed Bond Information Sheet, so that City staff can prepare the bond agreement. 3) The 3-foot right of way dedication shall occur through a Statutory Warranty Deed. Please complete and return the warranty deed worksheet, including a legal description and exhibit prepared by a Licensed Surveyor. 4) A Declaration of Covenant (refer to the enclosed document) shall be recorded on the property. 5) In addition to the above declaration of covenant (or perhaps as a. part of it), the Text of Instructions for Non -Vegetated Permeable Pavement (Sec. C.2.6.7. of Appendix C of the 2009 KCSWDM) shall be recorded on the property. 6) Copies of any WSDOT Permits or Approval (for work in the WSDOT ROW) should be provided to the undersigned at your earliest convenience. Doc. I.D. 25089528087 Please revise the plans and provide the additional requested information. When re -submitting, please provide 4 copies of the revisions, as well as the red -line markups. If you have any questions, please feel free to contact me at (253)835-2734, or via e-mail at kepi n. peterso n(rr].c ityo ffederalway. corn . Sincerely, &'1k 0_� Kevin Peterson Engineering Plans Reviewer K: mj enclosure cc: Project File Day File Doc. I.D. 25089528087 CITYOF v& RECE. E® PERMI ..., APPLICA'TION Federal Way JUL 17 Z013 pF ED RAL WAY PERMIT NUMBER ' jca ��z / J I _ r [� TARGET DATE SITE ADDRESS SUITE/UNIT # 2245 S. 333rd St., Federal Way PROJECT VALUATION ZONING ASSESSOR'S TAX/PARCEL # $ 2,000,000.00 RM-2400 7 9 7 8 2 0 _ 0 1 8 0 TYPE OF PERMIT ❑ BUILDING ❑ PLUMBING ❑ MECHANICAL ❑ DEMOLITION ❑ ENGINEERING ❑ FIRE PREVENTION NAME OF PROJECT Federal Way Multi -Family Construction of three (3) three story multi -family buildings: one (1) four -unit (sprinklers), one (1) three - PROJECT DESCRIPTION Detailed description of work to unit (sprinklers), one two -unit (no sprinklers) along with storm system, sewer, water, curb- gutter, paving, and frontage improvements. be included on this permit only NAME PRIMARY PHONE PROPERTY OWNER RTI, LLC 253-693-4730 MAILING ADDRESS 310 29th St. NE, Ste 201 E-MAIL roberttrent@me.com CITY _TSTATE ZIP Puyallup WA 98372 NAME PHONE TBD MAILING ADDRESS E-MAIL CONTRACTOR CITY STATE I ZIP FAX WA STATE CONTRACTOR'S LICENSE # EXPIRATION DATE 1 FEDERAL WAY BUSINESS LICENSE # NAME PRIMARY PHONE Same as Owner MAILING ADDRESS E-MAIL APPLICANT CITY STATE ZIP FAX — - — NAME — _ PRIMARY PHONE PROJECT CONTACT CES NW Inc. 253-848-4282 MAILING ADDRESS 310 29th St NE, Ste 101 E-MAIL bnapier@cesnwinc.com (The individual to receive and respond to all correspondence CITY STATE ZIP FAX concerning this application) Puyallup WA78M 253-848-4278 PROJECT FINANCING NAME Same as Applicant ❑ OWNER -FINANCED MAILING ADDRESS, CITY, STATE, ZIP PHONE Required value of $5,000 or more (RCW 19.27095) I certify under penalty of perjury that I am the property owner or authorized agent of the property owner. I certify that to the best of my knowledge, the information submitted in support of this permit application is true and correct. I certify that I will comply with all applicable City of Federal Way regulations pertaining to the work authorized by the issuance of a permit. I understand that the issuance of this permit does not remove the owner's responsibility for compliance with local, state, or federal laws regulating construction or environmental laws. I further agree to hold harmless the City of Federal Way as to any claim (including costs, expenses, and attorneys' fees incurred in the investigation and defense of such ciutm), which may he made by any person, including the undersigned, and filed against the city, but only where such claim arises out of the reliance of the city, including its officers and employees, upon the accuracy of the information supplied to the city as apart of this application. / 9 SIGNATURE: /?.. _DATE 7/17/2013 PRINT NAME: arbara Napier Bulletin #100 — January 1, 2013 Page 1 of 3 k:\l-IandoutAPermit Application Recording Requested By: When Recorded Mail To: City of Federal Way Atlas: Kevin Peterson/Public Works 33325 8t' Ave S Federal Way, WA 98003 DECLARATION OF COVENANT Grantor (s): RTI, LLC. Grantee (s): CITY OF FEDERAL WAY, a Washington Municipal Corporation Property Legal Description (abbreviated): State Plat in SEC 16-21-4 Lot 3 KCSP No. 280049 Rev. Rec. No. 8110190295 SD Plat DAF-Tract 26 Less State Hwy Complete Legal Description indicated below. Assessor's Tax Parcel ID#(s): 7978200180 IN CONSIDERATION OF the approved City of Federal Way ("City") site development permit for Application No. 13-103176-00-EN relating to real property legally described as: LOT 3, KING COUNTY SHORT PLAT NUMBER 280049 REVISION, RECORDED UNDER RECORDING NUMBER 8110190295, IN KING COUNTY, WASHINGTON, SAID SHORT PLAT BEING A REVISION OF SHORT PLAT RECORDED UNDER RECORDING NUMBER 8009090741, KING COUNTY WASHINGTON, the undersigned as Grantor(s) declares that the above described Property is hereby subject to a perpetual easement for a natural or constructed storm water system ("System") and hereby dedicates, covenants, and agrees as follows: City shall have the right to ingress and egress over the Property to access such easement area for inspection of and to reasonably monitor the System for performance, operational flows or defects in accordance with City's Surface Water Management Divisions procedures. 2. If City determines that maintenance or repair work is required to be done to the System, the Manager of the Surface Water Management Division of the Department of Public Works ("Manager") shall give notice of the specific maintenance and/or repair required. The Manager shall also set a reasonable time in which such work must be completed by the Grantor, its heirs, successors or assigns. If the above required maintenance and/or repair is -1- not completed within the time set by the Manager, the City may perform the required maintenance and/or repair. Written notice will be sent to the Grantor stating the City's intention to perform such maintenance. Maintenance work will not commence until at least seven (7) days after such notice is mailed. If, within the sole discretion of the Manager, there exists an imminent or present danger, said seven (7) day notice period will be waived and maintenance and/or repair work will begin immediately. 3. If at any time the City reasonably determines that any existing retention/detention system creates any conditions detrimental to the receiving surface water system, public and/or private property, the Manager may take any measures pursuant to Federal Way Revised Code. 4. The Grantor shall assume all responsibility for the cost of any maintenance and for repairs to the System. Such responsibility shall include reimbursement to the City within thirty (30) days of the receipt of the invoice for any such work performed. Overdue payments will require payment of interest at the current legal rate as liquidated damages. If legal action ensues, the prevailing party is entitled to costs and/or fees. 5. The Grantor is hereby required to obtain written approval from the Manager prior to filling, piping, cutting, or removing vegetation (except in routine landscape maintenance) in open vegetated drainage facilities (such as swales, channels, ditches, ponds, etc.), or performing any alterations or modifications to the drainage facilities contained within Property as described previously. Any notice or consent required to be given or otherwise provided for by the provisions of this Declaration of Covenant shall be effective upon personal delivery, or three (3) days after mailing by Certified Mail, return receipt requested. 6. Grantor agrees to indemnify, defend, and hold City, its elected officials, officers, employees, agents, and volunteers harmless from any and all claims, demands, losses, actions and liabilities (including costs and all attorney fees) to or by any and all persons or entities, including, without limitation, their respective agents, licensees, or representatives, arising from, resulting from, or connected with this Declaration of Covenant except to the extent caused by the sole negligence of the City. 7. Grantor agrees to comply with the following instructions from the 2009 KSWDM, Appendix C, regarding non -vegetated permeable pavement: Your property contains a stormwater management flow control BMP (best management practice) called "permeable pavement," which was installed to minimize the stormwater quantity and quality impacts of some or all of the paved surfaces on your property. Permeable pavements reduce the amount of rainfall that becomes runoff by allowing water to seep through the pavement into a free -draining gravel or sand bed, where it can be infiltrated into the ground. The type(s) of permeable pavement used on your property is: ❑ porous concrete, X porous asphaltic concrete, ❑ permeable pavers, ❑ modular grid pavement. IWM The area covered by permeable pavement as depicted by the flow control BMP site plan and design details must be maintained as permeable pavement and may not be changed without written approval either from the Manager or through a future development permit from Grantee. Permeable pavements must be inspected after one major storm each year to make sure it is working properly. Prolonged ponding or standing water on the pavement surface is a sign that the system is defective and may need to be replaced. If this occurs, contact the pavement installer or the Manager for further instructions. A typical permeable pavement system has a life expectancy of approximately 25-years. To help extend the useful life of the system, the surface of the permeable pavement should be kept clean and free of leaves, debris, and sediment through regular sweeping or vacuum sweeping. The owner is responsible for the repair of all ruts, deformation, and/or broken paving units. This covenant is intended to protect the value and desirability of the Property, and shall inure to the benefit all the citizens of City of Federal Way, and shall run with the land, and shall touch and concern the land, and shall be binding on all heirs, successors, and assigns. -3- GRANTOR By: Name: Robert V. Trent Title: Manager STATE OF WASHINGTON ) ) ss. COUNTY OF ) On this day personally appeared before me Robert V . Trent , to me known to be the Manager of RTI, LLC , that executed the foregoing instrument, and acknowledged the said instrument to be the free and voluntary act and deed of said corporation, for the uses and purposes therein mentioned, and on oath stated that he/she was authorized to execute said instrument and that the seal affixed, if any, is the corporate seal of said corporation. GIVEN my Band and official seal this W day of , 20]�. r. r+ Awh�r 4. W�2 Mo.'s� W pus (typed/printed name of notary) ��a�b .._= Notary Public in and for the State of Washington. rf j.,il OF rW A My commission expires 1 -4- Return Address: City of Federal Way Atlas: Kevin Peterson, Public Works Dep't. 33325 8' Ave S Federal Way, WA 98003-6325 STATUTORY WARRANTY DEED Grantor (s): RTI, LLC, a limited liability company Grantee (s): CITY OF FEDERAL WAY, a Washington municipal corporation Property Legal Description (abbreviated): Prtn. of SE'/4 of SW '/4 S 16, TWP 21 N, R 4 E, W.M. Additional Legal(s) on Exhibit A Assessor's Tax Parcel ID#(s): 797820 0180 THE GRANTOR(S) RTI, LLC, a limited liability company, for and in consideration of The City of Federal Way's approval of permit No. 13-103176-00-EN for construction of a multi -family development and associated improvements and other good and valuable consideration, convey(s) and warrant(s) to the CITY OF FEDERAL WAY, a Washington municipal corporation, all of its right, title and interest, and any after -acquired interest therein, in and to the following described real property situated in County of King, State of Washington: Full legal description of Property attached hereto as Exhibit "A", and incorporated herein by this reference. DATED THIS day of 20 GRANTOR RTI, LLC (signature) Robert Trent, Manager 11104 238' St East Graham, WA 98338 STATE OF WASIHNGTON ) ) ss. COUNTY OF ) On this day personally appeared before me, Robert Trent, to me known to be the individual(s) described in and who executed the foregoing instrument, and on oath swore that he executed the foregoing instrument as his free and voluntary act and deed for the uses and purposes therein mentioned. GIVEN my hand and official seal this day of P 20 (notary signature) (typed/printed name of notary) Notary Public in and for the State of Washington. My commission expires L:\CSDC\docs\save\3926231085.doc G:\1awforms\deeddev.doc 08/04 "EXH l BIT A" 3' Right -of -Way Dedication Description That portion of the southeast quarter of the southwest quarter of Section 16, Township 21 North, Range 4 East, W.M., City of Federal Way, King County, Washington, more fully described as follows: Beginning at the northwest corner of Lot 3, King County Short Plat Number 280049 revision, recorded under recording number 8110190295, in King County, Washington; Thence S 00'14'01" W, along the west line of said Lot 3, 3.00 feet; Thence S 89'13'33" E, parallel to the north line of said Lot 3, 89.54 feet to a point of curve; Thence southeasterly along a curve to the right the center of which bears S 00°46'27" W 25.00 feet distant, through a central angle of 89027'49", an arc distance of 39.04 feet, to the westerly margin of 24th Avenue South; Thence N 00'14'16" E, along said westerly margin, 3.00 feet to a point of curve; Thence northwesterly along a curve to the left the center of which bears N 89'45'44" W, 25.00 feet distant, through a central angle of 89'27'49", an arc distance of 39.04 feet to the north line of said Lot 3; Thence N 89'13'33" W, along said north line, 89.54 feet to the true point of beginning. Containing 343 square feet, more or less. -16 -l3 3.t Page 1 of 2 CE, S:.1 W,WC.. CIVIL ENGINEERING 9 SURVEY/NO 310 — 29M Sr. NE, SUITE 101 Bus: (253) 848-4282 PUYAUUP, WA 98372 Fax: 253 848-4278 LRC — -7 ENT RESIDENCE RIGHT-OF-WAY DE ICATION POR-RON OF SE 1/4 OF THE SW 1/4, SECTION 16, TWN 21 N, RGE 4 E, W.M. CITY OF FEDERAL WAY, KING COUNTY, WA POINT OF BEGINNING S ]� S. 333.RD ST. A 89'27'49" S 89'13'33" E 89.54' R=25.00 -3.00 — — — L=39.04' N89'13'33"W 89.54' 1 o A=89"27'49" d R=25.00 o g L= 39.04' o �F oUl , "EXHIBIT A" 3' Right -of -Way Dedication Description That portion of the southeast quarter of the southwest quarter of Section 16, Township 21 North, Range 4 East, W.M., City of Federal Way, King County, Washington, more fully described as follows: Beginning at the northwest corner of Lot 3, King County Short Plat Number 280049 revision, recorded under recording number 8110190295, in King County, Washington; Thence S 00`14'01" W, along the west line of said Lot 3, 3.00 feet; Thence S 89`13'33" E, parallel to the north line of said Lot 3, 89.54 feet to a point of curve; Thence southeasterly along a curve to the right the center of which bears S 00°46'27" W 25.00 feet distant, through a central angle of 89`27'49", an arc distance of 39.04 feet, to the westerly margin of 24th Avenue South; Thence N 00'14'16" E, along said westerly margin, 3.00 feet to a point of curve; Thence northwesterly along a curve to the left the center of which bears N 89°45'44" W, 25.00 feet distant, through a central angle of 89'27'49", an arc distance of 39.04 feet to the north line of said Lot 3; Thence N 89'13'33" W, along said north line, 89.54 feet to the true point of beginning. Containing 343 square feet, more or less. - 16-13 zF -e .,,-ci �4$" nAL tans - Page 1 of 2 CIl1IL ENGINEERING & SURYEYING 310 - 29M ST. NE, SUITE 101 Bus: (253) 848-4282 PUYALLUP, WA 98372 Fax: 253 848-4278 POINT OF BEGINNING S. 333RD S 89'13'33" E deft ST. 89.54' N89'13'33"W 89.54' ENO 0 d- 0 0 co PRO,EC i 12074.0 TRENT RESIDENCE RIGHT -OF -WAY DEDICATION PORTION OF SE 1/4 OF THE SW 1/4, SECTION 16, TWN 21 N, RGE 4 E, W.M. CITY OF FEDERAL WAY, KING COUNTY, WA 0=89°27'49' R=25.00 L=39.04' d=89°27'49" R=25.00 L=39.04' o 0 o , CITY OF Federal Way Public Works Department STATUTORY WARRANTY DEED WORKSHEET Grantor (indicate whether an individual or corporation): RTI, LLC a limited liability corporation Abbreviated Legal Description: see attached Exhibit A Full Legal Description (attach and label as "Exhibit -A" if description is long): see attached Exhibit A Assessor's Tax Parcel ID #(s): 7978200180 Signator: Robert V. Trent Title: President 11104 - 238th Street East, Graham, WA 98338 Building Permit #:. 13-103176-00-EN Permit is for (single-family home, commercial retail building, church, etc.): townhouse development If owner is a corporation, attach Proof of Authority to sign (copy of corporate minutes). Enclose two site plans, 8.5" x 11", showing the right-of-way dedication area. RESUBMIT"ED S E P 19 2013 CITY OF FEDERAL WAY CDS K:\DEVELOPMENT SERVICES\DEVELOPMENT STANDARDS\2008 Development Standards-DRAFr\Checklists\Statutory Warranty Deed worksheet.doc Statutory Warranty Deed Worksheet Page 1 of 1 '3Q v*: aresraror r a�rw�v ipta r " �� 0AYAN y NVId UIS =e = V e J83WOHNMOL AVM 1VV303dCe �i 8 � � x 0- gig J 11 Mai 1,11,1����aka � IJOLL W l s kkk777 $ � e U � YO vi vi WN 5 Yg qR g a F b soaassssa Ike e� g Y gig r�s R f� r g qq a� re K®ENE 4 aaa "as ""gxgaa88 �8 a3 e ti; ~ C MR 2 Bg R{ a? €s m � o n� x �b °0 �m� �a� lit it i5 � o gt� 59 lie I 1' 1 ry '+♦ ,s 1 I I ----------- I I I 1 I'. yH� L* ♦ • a ♦ I L_------__J z � uiarsauws 'lltl" `07 - �!' ara"APW awy►"W" a : [r �71 rwnw US �NIrHV371J S3YIlL?14HMOl AVM 7Mk1303 w ; HIM gill. Wr. �— U.1- ------ ----- I OOY1 a�a Q ,c LL 0 LU � cct aI a wl W US W >3e r e@ cr h .av No Z R AIR�x mk;�ka� �' �3crr�nr I� M I 1 i, I y I � g-- I � I I STATE OF WYOMING Office of the Secretary of State I, MAX MAXFIELD, SECRETARY OF STATE of the STATE OF WYOMING, do hereby certify that the filing requirements for the issuance of this certificate have been fulfilled. CERTIFICATE OF ORGANIZATION R.TI LLC Accordingly, the undersigned, by virtue of the authority vested in me by law, hereby issues this Certificate. I have affixed hereto the Great Seal of the State of Wyoming and duly executed this official certificate at Cheyenne, Wyoming on this 10th day of November, 2009. Secreta o tate By: Macha Bowman Filed Date: 11/10/2009 Max Maxfield, WY Secretary of State FILED. 11/10/2009 04:11 PM ID:2009-000576629 ARTICLES OF ORGANIZATION OIL RTI LLC A LIMITED LIABILITY COMPANY I. The name of the limited liability company is RTI LLC, a Limited Liability Company. Il. The period of its duration is thin 30 ears from the date of filing Articles of Organization with the Wyoming Secretary of State. Ill. The purpose for which the limited liability company is organized,, is: any lawful u ose except for the purposes of bankiniz and insurance. IV. The name and address of its registered agent is: Wyoming Corporate Services, Inc. 2710 Thomes Ave. Cheyenne, WY 82001 (The registered agent may be an individual resident in 111is state or a donestic foreign corporation authorized to transact business in this state, having a business office identical with such registered office.) V. The total amount of cash and a description and agreed value of property other than cash contributed is: None at present. VI. The total additional contributions, if any, agreed to be made by aII members and fire times at which or events upon the happening of which they shall be made are: None at present. However, additional contributions may be made as agreed upon by the members in the future. VII. The right, if given, of the members to admit additional members, and the tenths and conditions of the admission are: The members of this limited liability company may admit additional members upon a unanimous vote approving such an admittance of additional members unless otherwise stated. VIII. The remaining members of the limited liability company shall have the right to continue the business on the death, retirement, resignation, expulsion, bankruptcy or dissolution of a member or occurrence of any other event which terminates tlrt�r�; continued membership of a member of the limited liability company: S�J+ }'7ram� IX. if the limited liability company is to be managed by a manager or managers the names and addresses of the manager or managers who are to serve as managers until the first annual meeting of members.or until their successors are elected and qualify are: Michael Dattilo 2710 Thomes Ave. Cheyenne, WY 82001 Dated this 6th day of November, 2009. yoming Corporate Services, Inc., Organizer CONSENT TO APPOINTMENT BY RE, GISTL+'RE' D AGENT 1. Wyoming Corporate Services, Inc., voluntarily consents to serve as the registered agent for RTI LLC on the date shown below; 2. The registered agent certifies that it is a domestic corporation or not -for -profit domestic corporation whose business office is identical with the registered office. 3. The undersigned by and on behalf of Wyoming Corporate Services, Inc., hereby Certify that I am in compliance with the requirements of W.S. 17-28-101 through W.S. 17-28-111. Dated this Cth day of November, 2009. Wyoming Corporate Services, Inc. DATE: PARTIES: OPERATING AGREEMENT MANAGER -MANAGED For RTI LLC RECITAL: The parties to this agreement (the "Members") are entering into this agreement for the purpose of forming a limited liability company that is to be managed by one or more managers (tine "Managers") under the Limited Liability Company Act of the state of Wyoming (the "Act"). AGREEMENTS: 1. FORMATION 1.1 Name. The name of this limited liability company (the "Company") is RTI LLC. 1.2 Articles of Organization. Articles of organization for the Company were filed with the Secretary of State for the state of Wyoming on November 10th, 2009. 1.3 Duration. The Company will exist until dissolved as provided in this agreement. 1.4 Principal Office. The Company's principal office will initially be at , but the Managers may relocate it at any time. 1.5 Designated Office and Agent for Service of Process. The Company's initial designated office will be at 2710 Thomes Ave., Cheyenne, WY 82001, and the name of its initial agent for service of process at that address will be Wyoming Corporate Services, Inc. The Company's designated office and its agent for service of process may only be changed by filing notice of the change with the Secretary of State of the state in which the articles of organization of the Company were filed. 1.6 Purposes and Powers. The Company is formed for the purpose of engaging in the business of t c..n d Z-AiW, -", (ot,;. The Company has the power to do all things necessary, incident, or in furtherance of that business. 1.7 Title to Assets. Title to all assets of the Company will be held in the narne of the Company. No Member has any right to the assets of the Company or any ownership interest in those assets except indirectly as a result of the Menmber's ownership of an interest in time Company. No Member has any right to partition any assets of the Company or any right to receive any specific assets upon liquidation of the Company or upon any other distribution from the Company. 2. MEMBERS, CONTRIBUTIONS AND INTERESTS 2.1 Initial Members. The names and addresses of the Members of the Company, the amounts of their initial capital contributions, and their initial Ownership Interests are: Nance and address Contribution Ownership Interest �" � / t- 1 ( L'A f- 'R !, U U 1 o o 41" Each Member's Ownership Interest at any time will be determined by the ratio of the Member's aggregate capital contributions to the aggregate capital contributions of all Members. 2.2 Initial Capital Contributions. The initial capital contributions of must be paid to the Company, in cash,, immediately after all parties have signed this agreement. The initial capital contribution of any assets listed on the attached Exhibit A must be made by transferring to the Company the assets listed on the attached Exhibit A. The transfer of the assets must be rnade immediately after all parties have signed this agreement by executing and delivering to the Company such documents as may be necessary to transfer the assets listed on the attached Exhibit A to the Company free and clear of all liens and encumbrances. The transfer documents must include warranties of title and good right to transfer. 2.3 AdditionaI Members. Additional members of the Company may be admitted with the consent of the Managers if the Managers have approved additional capital contributions, the Members have not contributed the maximum amount of such contributions, and the additional members do not contribute any more capital than the difference between the maximum set by the Managers and the arnount contributed by the Members. Additional members may also be admitted under the section of this agreement relating to substitution. Otherwise, additional members may not be admitted except with the approval of the Members. 2.4 Additional Contribu tions. Except as otherwise provided in the Act, no Member is required to contribute additional capital to the Company. Additional capital contributions to the Company may be made by the Members only with the approval of the Managers. If the Managers approve additional capital contributions, the Managers must set a maximum amount of such contributions that will be accepted from the Members. Each Member will then have the right, but not the obligation, to contribute a pro rats share of the maximum based upon the Member's Ownership Interest. If any Member elects to contribute less than the Member's pro rata share of the maximum, the other Members may contribute the difference on a pro rata basis in accordance with their Ownership Interests or on any other basis they may agree upon. 2.5 No Interest on Capital Contributions. No interest will be paid on capital contributions. 2.6 Capital Accounts. An individual capital account will be maintained for each Member. A Member's capital account will be credited with all capital contributions made by the Member and with all income and gain (including any income exempt from federal income tax) allocated to the Member. A Member's capital account will be charged with the amount of all distributions made to the Member and with all losses and deductions ('including deductions attributable to tax-exempt income) allocated to the Member. Members' capital -accounts must be maintained in accordance with the federal income tax accounting principles prescribed in Treasury Regulations 1.704-1(b)(2)(iv). 2.7 Outside Activities. Members may engage in business and investment activities outside the Company, and neither the Company nor the other Members have any rights to the property, profits, or benefits of such activities. But no Member may enter into any business or investment activity that is competitive with the business of the Company unless the activity was approved in advance by action of the Members. 3. ALLOCATION OF PROFITS AND LOSSES 3.1 Determination. The net profit or net loss of the Company for each fiscal year will be determined according to the accounting principles employed in the preparation of the Company's federal income tax information return for that fiscal year. In computing net profit or net loss for purposes of allocation between Members, no special provision will be made for tax-exempt or partially tax-exempt income of the Company, and all items of the Company's income, gain, loss, or deduction required to be separately stated under IRC 703(a)(1) will be included in the net profit or net loss of the Company. 3.2 Allocation of Net Profits and Net Losses. The net profit or net loss of the Company for a fiscal year will be allocated among the Members in proportion to their Ownership Interests. 3.3 Allocations Solely for Tax Purposes. In accordance with IRC 704(c) and the corresponding regulations, income, gain, loss, and deduction with respect to any property contributed to the capital of the Company will be allocated among the Members, solely for income tax purposes, so as to take into account any variation between the adjusted basis of such property for federal income tax purposes in the hands of the Company and the agreed value of such property as set forth in this agreement, or in any document entered into at the time an additional contribution is made to the Company. Any elections or other decisions relating to the allocations to be made under this section will be made by the Managers. The allocations to be made under this section are solely for purposes of federal, state, and local income taxes and will not affect, or in any way be taken into account in computing, any Member's capital account, allocable share of the net profits and net losses of the Company, or right to distributions. 3.4 Prorates. If a Member has not been a Member during a full fiscal year of the Company, or if a Member's Ownership Interest in the Company changes during a fiscal year, the net profit or net loss for the year will be allocated to the Member based only on the period of time during which the Member was a Member or held a particular Ownership Interest. In determining a Member's share of the net profit or net loss for a fiscal year, the Managers may allocate the net profit or net loss ratably on a daily basis using the Company's usual method of accounting. Alternatively, the Managers may separate the Company's fiscal year into two or more segments and allocate the net profits or net losses for each segment among the persons who were Members, or who held particular Ownership Interests, during each segment based upon their Ownership Interests during that segment. 4. DISTRIBUTIONS 4.1. Distributions to Pay Taxes. To enable the Members to pay tuxes on income of the Company that is taxable to the Members, the Company must make cash distributions to the Members, during each fiscal year, in an amount equal to the product of (a) the highest aggregate rate of federal, state, and local income and self-employment tax imposed on the Company's income for that fiscal year (taking into account the deductibility of state and local income taxes for federal income tax purposes) allocated to any Member who was a Member for the full fiscal year times (b) the amount of the taxable income of the Company allocated to all Members for that fiscal year. Distributions must be paid at least quarterly during each fiscal year at times that coincide with the Members' payment of estimated taxes, and the amount of each distribution will be based upon the anticipated taxable income of the Company for the fiscal year of the distribution and the anticipated tax rates of Members, as determined at the time the distribution is made. The Company's obligation to make distributions under this section is subject to the restrictions governing distributions under the Act. 4.2 Additional Distributions. Subject to the restrictions governing distributions un der the Act, additional distributions of cash or property may be made from time to time by the Company to the Members, lit such times and in such amounts as the Managers determine. 4.3 Allocation of Distributions. All distributions to pay taxes and additional distributions must be made to Members in proportion to their Ownership interests. 5. MANAGERS 5.1 Number and Qualifications. As provided in the articles of organization of the Company, the Company will be managed by Managers. The number of Managers serving at any given time will be the number elected by the Members, but the number may not be less than one nor more than three. Managers may be entities as well as individuals and need not be Members. Se lnr ial Managers. There will initisally be two Managers of the Company, �l c. and iG� 6 <r f faqZf - 5.3 Election and Term. Managers will be elected at meetings of the Members called for the purpose of electing Managers. The notice of any meeting of the Members at which Managers are elected must state that the purpose, or one of the purposes, of the meeting is the election of Managers. Each Manager, including each of the initials Manager named in this agreement, will serve for a term ending at the next meeting of Members called for the purpose of electing Managers, or until the Manager's earlier death, resignation, or removal. 5.4 Resignation and Removal. A Manager may resign at any time by delivering a written resignation to the Members. The resignation will be effective when received by all Members unless a later effective date is stated in the written resignation. The Members may remove any Manager at any time, with or without cause. But a Manager may be removed by the Members only at a meeting of the Members called for the purpose of removing the Manager, and the notice of the meeting must state that the purpose, or one of the purposes, of the meeting is the removal of a Manager. The resignation or removal of a Manager who is also a Member will not constitute a withdrawal or expulsion of the Manager as a Member of the Company or otherwise affect the Manager's rights as a Member. 5.5 Authority. Subject to the limitations imposed by this agreement or by action of the Managers or the Members, each Manager is an agent of the Company and has authority to bind the Company in the ordinary course of the Company's business. But no Manager has authority to engage in any of the following acts unless the act was approved in advance by action of the Members; 5.5.1 To sell, lease, exchange, mortgage, pledge, or otherwise transfer or dispose of all or substantially all of the property or assets of the Company; 5.5.2 To merge the Company with any other entity; 5.5.3 To amend the articles of organization of the Company; 5.5.4 To incur indebtedness by the Company other than in the ordinary course of business; 5.5.5 To authorize a transaction involving an actual or potential conflict of interest between a Manager or a Member and the Company; 5.5.6 To change the nature of the business of the Company; or 5.5.7 To commence a voluntary bankruptcy case for the Company. The Managers may, but are not required to, refer any other matter to a vote of the Members. 5.6 Other Agents. By action of the Managers, other agents may be authorized to act on behalf of the Company. The authority given such agents may be general or may be limited to specific matters. 5.7 Powers of Members. No Member who is acting solely in his or her capacity as a Member is authorized to act on behalf of the Company. 5.8 Devotion of Time; Outside Activities. Each of the Managers must devote so much time and attention to the business of the Company as the Managers agree is appropriate. Managers may engage in business and investment activities outside the Company, and neither the Company nor the Members have any rights to the property, profits, or benefits of such activities. But no Manager may enter into any business or investment activity that is competitive with the business of the Company unless the activity was approved in advance by action of the Members. No Manager may use any property or assets of the Company other than for the operation of the Company's business. For this purpose, the property and assets of the Company include, without limitation, information developed for the Company, opportunities offered to the Company, and other information or opportunities entrusted to a Manager as a result of being a Manager of the Company. 5.9 Compensation and Reimbursement. The Managers will be paid such salaries and other compensation as may be fixed from time to time by action of the Members. The fact that a Manager is also a Member will not prevent the Manager from receiving a salary or other compensation from the Company. Managers are also entitled to reimbursement from the Company for reasonable expenses incurred on behalf of the Company, including expenses incurred in the formation, dissolution, and liquidation of the Company. 5.10 Meetings of Managers. if there is more than one Manager serving, meetings of the Managers may be called by any Manager. Meetings of the Managers will be held at the principal office of the Company, unless another place is fixed by action of the Managers. Notice of the date, tune, and place of all meetings must be given to each Manager at least 24 hours prior to the meeting. The notice may be. oral or written. Oral notice will be effective when given. Written notice will be effective at the earliest of [lie following times; (a) when received by the Manager, (b) when sent by facsimile or other form of electronic communication reasonably expected to be received immediately at the Manager's place of business, or (c) three days after mailing. A majority of Managers comts[itutes a quorum for any meeting of the Managers. Each Manager is entitled to one vote, and a matter submitted to a vote at a meeting of the Managers will be approved if a majority of the Managers voting on the matter vote in favor of the matter. 6. MEMBER MEETINGS 6.1. Meetings. A meeting of Members may be called by the Managers or by Members holding at least 1.0 percent of the Ownership Interests. If a meeting is called by Members, the Members must deliver a written demand for a meeting addressed to the Managers at the Company's principal office, and the written demand trust state the purpose for which the meeting is to be held. Meetings of the Members will be held at the principal office of the Company, or at another place within 25 miles of the principal office that is fixed by action of the Managers and is set forth in the notice of the meeting. 6.2 Notice of Meetings. Notice of the date, time, and place of all meetings must be given to each Member in writing not earlier than 60 days nor less than 10 days before the meeting date. The notice must be mailed to each Member at the Member's address as shown on the Company's records and must include a description of the purpose or purposes for which the meeting is called. 6.3 Record Date. The Members who are entitled to notice of a meeting of Members and to vote at the meeting, and their respective Ownership Interests; will be determined as of the record date for the meeting. The record date may be selected by the Managers and may not be more than 70 days not less than 10 days before the meeting. If the Managers do not select a record date for a meeting of Members, the record date will be the date on which the initial notice of the meeting was mailed to the Members. 6.4 Quorum and Voting. A Member may be represented at a meeting of Members, and may vote, in person or by written proxy. The presence at a meeting of Members, in person or by proxy, of Members holding more than 50 percent of the Ownership Interests constitutes a quorum. Each Member is entitled to vote the Member's Ownership Interest. Except as otherwise provided in the articles of organization, this agreement, or the Act, a matter submitted to a vote at a meeting of the Members will be approved if a majority of the Ownership Interests voted on the matter are voted in favor of the matter. 6.5 Self Interest. A Member does not violate any duty or obligation to the Company merely as a result of engaging in conduct that furthers the interest of the Member. A Member may lend money or transact other business with the Company, and, in this case, the rights and obligations of the Member will be the same as those of a person who is not a Member, so long as the loan or other transaction has been approved or ratified by the Managers, or has been approved or ratified by the Members if the loan or other transaction involves a Manager. Unless otherwise provided by applicable law, a Member with a financial interest in the outcome of a particular action is nevertheless entitled to vote on such action. 7. ACTION BY MANAGERS OR MEMBERS 7.1 Meetings Without Notice. Notwithstanding any other provision of this agreement, if all of the Managers or all of the Members hold a meeting at any time or place and no Manager or Member objects to the lack of notice, the meeting will be valid even if there was no notice or the notice given was insufficient, and any action taken at the meeting will be the action of the Managers or Members, as the case may be. 7.2 Actions Without Meeting. Any action required or permitted to be taken by the Managers or by die Members at a meeting may be taken without a meeting if a written consent setting forth the action taken is signed by all of the Managers or Members, as the case may be. All written consents of the Managers and Members must be retained as part of the Company's records of meetings. 7.3 Meetings by Telephone. Meetings of the Managers or Members may be Held by conference telephone or by any other means of communication by which all participants can bear each other simultaneously during the meeting. If a Manager or Member participates in a meeting; by conference telephone or by other means authorized by this section, the Manager or Member will be considered to be present at the meeting in person. 8. ACCOUNTING AND RECORDS 8.1 Books of Account. The Managers must keep such books and records relating to the operation of the Company as are appropriate and adequate for the Company's business and for the carrying out of this agreement. At a minimum, the following must be maintained at the principal office of the Company: (a) financial statements for the three most recent fiscal years; (b) federal, state, and local income tax returns for the three most recent fiscal years; (c) a register showing the current names and addresses of the Members; (d) a copy of the Company's articles of organization and any amendments thereto; (e) this agreement and any amendments thereto; (f} minutes of any meetings of Managers or Members; and (g) consents to action by Managers or Members. Each Member will have access to all such books and records at all times. 8.2 Fiscal Year. The fiscal year of the Company will be the calendar year. 8.3 Accounting Reports. Within 90 days after the close of each fiscal year, Company must deliver to each Member an unaudited report of the activities of the Company for the preceding fiscal year, including a copy of a balance sheet of the Company as of the and of the year and a profit and loss statement for the year. 8.4 Tax Returns. The Company must prepare and file all required federal, state, and local income tax and other tax returns on a timely basis. Within 90 days after the end of each fiscal year, the Company must deliver to each Member a Schedule K-1, showing the amounts of any distributions, contributions, income, gain, loss, deductions, or credits allocated to the Member during the fiscal year. 8.5 Tax Matters Partner. Anytime the Company has more than 10 Members, any Member is an entity other than an estate or a C corporation, or any Member is a nonresident alien individual, the Managers must designate one of the Members as the tax matters partner of the Company in accordance with IRC §6231(a)(7) and keep such designation in effect at all times. In making this designation, preference must be given to Members who are also Managers. 9. DISSOCIATION AND DISSOLUTION 9.1 Withdrawal. A Member may not withdraw from the Company. 9.2 Events of Dissolution. Except as otherwise provided in this agreement, the Company will dissolve upon the earliest of: (a) the death, incompetence, expulsion, bankruptcy, or dissolution of any Member; (6)approval of a dissolution of the Company by action of the Members; or (c) at such time as the Company has no Members. 9.3 Effect of Member's Dissociation. Within 120 days of the death, incompetence, expulsion, bankruptcy, or dissolution of a Member, the other Members (whether one or more) may elect to continue the Company by themselves or with others, and to cause the Company to purchase the interest of the dissociating Member pursuant to the provisions of the sections of this agreement relating to purchase price and payment for member's interest. Making the election is in the sole discretion of the other Members and requires the consent of other Members holding a majority of the Ownership Interests held by the other Members. Notice of the election must be given in writing to the dissociating Member or the dissociating Member's successor in interest promptly after the election is made. If the other Members do not so elect, the Company will be dissolved. 9.4 Purchase Price. If the other Members elect to cause the Company to purchase the interest of a dissociating Member under the section of this agreement relating to effect of member's dissociation, the purchase price of the dissociating Member's interest in the Cornpainy will be determined by agreement between the Managers and the dissociating Member. If all agreement on the purchase price is not reached within 30 days following tine election to purchase the interest of the dissociating Member, the interest must be valued by a third party appraiser selected by the Managers who is reasonably acceptable to the dissociating Member, and the purchase price will be the value determined in that appraisal. In appraising the interest to be purchased, the appraiser must determine the fair market value of the interest as of the date of the event of dissociation. In determining the value, the appraiser rust consider the greater of the liquidation value of the Company or the value of the Company based upon sale of the entire Company as a going concern. The appraiser must also consider appropriate minority interest, lack of marketability, and other discounts. If the appraisal is not completed within 120 days following the election to purchase the interest of the dissociating Member, either the Managers or the dissociating Mermber may apply to a court of competent jurisdiction for the appointment of another appraiser, in which case the court -appointed appraiser must appraise tlae interest of the dissociating Member in accordance with the standards set Portia in this section, and the purchase price will be the value determined in that appraisal. 9.5 Payment for Member's Interest. The purchase price for the interest of a Member purchased under the section of this agreement relating to effect of member's dissociation will be paid as follows: 9.5.1 The purchase price will bear interest from the date of the election of the other Members to purchase the dissociating Member's interest at the prune rate of interest in effect oil the date of the election as quoted in The Wall Street Journal or, if that publication is not available, another reputable national publication selected by the Managers that is reasonably acceptable to the dissociating Member. 9.5.2 The purchase price will be payable in accordance with the terms of a promissory. note of the Company providing for die payment of the principal amount in 60 equal monthly installments, including interest on the unpaid balance, with the first installment to be due one month after the date of closing and an additional installment to be due on the same day of each month thereafter until the promissory note is paid in full. The promissory note will bear interest from the date of the closing at the rate specified above. The promissory note must provide that if any installment is not paid when due, the holder may declare the entire remaining balance, together with all accrued interest, immediately due and payable. Partial or complete prepayment of file remaining balance due under the promissory note will be permitted at any time without penalty, provided that any partial prepayment will not affect the amount or regularity of payments coming due thereafter. 9.5.3 The purchase must be closed within 30 days following the determination of the purchase price. At the closing, the dissociating Member must sign and deliver to the Company a written assignment transferring the entire interest of the dissociating Member in the Company to the Company free and clear of all encumbrances. Such assignment must contain warranties of title and good right to transfer. At the closing, the Company must pay the accrues] interest on the purchase price then due to the dissociating Member, and the Company must also deliver its promissory note to the dissociating Member. Each of the other Members must sign and deliver to the dissociating Member a security agreement granting a security interest to the dissociating Member in that percentage of the interest of each of the other Members in the Company equal to the Ownership Interest of the dissociating Member being purchased by the Company. The security agreement must be in a form reasonably acceptable to the attorney for the dissociating Member and will secure payment of the promissory note by the Company. The security agreement must provide that if there is a default in the payment of the promissory note by the Company and the: security interest is foreclosed or the interest in the Company is retained by the secured party in satisfaction of the indebtedness, the interest may be transferred without the necessity of tendering the interest to the Company under the section of this agreement relating to tender of interest and the person acquiring the interest in the Company will be admitted as a member of the Company without further consent of the Members being required. As an example of the operation of this provision, if the Ownership Interest of a dissociating Member was 25% and there are three other Members, each with an Ownership Interest of 33-1/3% after the purchase of the dissociating Member's Ownership Interest by the Company, each of the other Members would be required to,grant the dissociating Member a security interest in an Ownership Interest of 8-1/3%. 9.6 Effect of Purchase of Member's Interest. A dissociating Member will cease to be a Member upon the election of the other Members to cause the Company to purchase the dissociating Member's interest pursuant to the section of this agreement relating to effect of member's dissociation. Thereafter, the dissociating Member will have no rights as a Member in the Company, except the right to have the dissociating Member's interest purchased in accordance with the terms of this agreement. 9.7 Successor in Interest. For purposes of this section relating to dissociation and dissolution, the term "dissociating Member" includes the dissociating Member's successor in interest. 10. WINDING UP AND LIQUIDATION 10.1 Liquidation Upon Dissolution. Upon the dissolution of the Company, the Managers must wind up the affairs of the Company unless the dissolution results from the dissociation of a Member and the other Members elect to continue the Company under the provisions of this agreement relating to effect of member's dissociation. If the affairs of the Company are wound up, a full account must be taken of the assets and liabilities of the Company, and the assets of the Company must be promptly liquidated. Following liquidation of the assets of the Company, the proceeds thereof must be applied and distributed in the following order of priority: 10.1.1 To creditors of the Company in satisfaction of liabilities and obligations of the Company, including, to the extent permitted by law, liabilities and obligations owed to Members as creditors (except liabilities for unpaid distributions); 10.1..2 To any reserves set up for contingent or unliquidated liabilities or obligations of the Company deemed reasonably necessary by the Managers, which reserves may be paid over to an escrow agent by the Managers to be held by such escrow agent for disbursement in satisfaction of the liabilities and obligations of the Company, with any excess being distributed to the Members as provided below; and 10.1.3 To Members in proportion to the positive balances of their capital accounts, after taking into account all adjustments made to capital accounts for the fiscal year during which the distributions to Members are made. 10.2 Distribution of Property in Kind. With approval of the Members, property of the Company may be distributed in kind in the process of winding up and liquidation. Ally property distributed in kind will be valued and treated for the Company's accounting purposes, ill accordance with Treasury Regulations §1.704-1(b)(2)(iv)(e)(1), as though the property distributed had been sold at fair market value on the date of distribution. If property is distributed in kind, the difference between the fair market value of the property and its adjusted tax basis will, solely for the Company's accounting purposes and to adjust the Members' capital accounts, be treated as a gain or loss on the sale of the property and will be credited or charged to the Members' capital accounts in the manner specified in the section of this agreement relating to capital accounts, 10.3 Negative Capital Accounts. If any Member has a negative balance in the Member's capital account upon liquidation of the Company, the Member will have no obligation to make any contribution to the capital of the Company to make up the deficit, and the deficit will not be considered a debt owed to the Company or any other person for any purpose. 11. TRANSFER OF MEMBERS' INTERESTS 11.1 General Restrictions. No Member may transfer all or any part of such Member's interest as a member of the Company except as permitted in this agreement. Any purported transfer of an interest or a part of an interest in violation of the terms of this agreement will be null and void and of no effect. For purposes of this section a "transfer" includes a sale, exchange, pledge, or other disposition, voluntarily or by operation of law. 11.2 Securities Law Restriction. Each Member acknowledges that the interest of the Member in the Company has not been registered under the Securities Act of 1933 or applicable state securities Iaws in reliance upon exemptions from registration and that the resale or other transfer of the interests of Members is restricted by applicable provisions of the Securities Act of 1933 and applicable state securities laws. Each Member agrees that the Member's interest may not be offered for sale, sold, transferred, pledged, or otherwise disposed of unless the interests of the Members in the Company are registered under the Securities Act of 1933 and applicable state securities laws or unless an exemption from registration is otherwise available. NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT, THE INTEREST OF A MEMBER IN THE COMPANY MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED, PLEDGED, OR OTHERWISE DISPOSED OF BY A MEMBER IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS OR AN OPINION OF COUNSEL SATISFACTORY TO THE MANAGERS THAT REGISTRATION UNDER THE SECURITIES ACT OF 1933 AND APPLICABLE STATE SECURITIES LAWS IS NOT REQUIRED. 11.3 Permitted Transfers. Subject to the restrictions contained in the section of this agreement relating to securities law restrictions, a Member may transfer all or a part of the Member's interest in the Company with the prior written consent of all other Members. If the other Members do not consent to a particular transfer and if the transfer does not violate the securities Iaw restriction, the Member may transfer all or a part of the Member's interest if such interest or part has been tendered for sale to the Company in accordance with the section of this agreement relating to tender of interest, the tender has not been accepted within the time limit set forth in that section, the transfer is made to the transferee named in the notice of tender within 180 days after the notice of tender is effective, and the transfer is at a price and upon terms no more favorable to the transferee than those set forth in the notice of tender. 11.4 Tender of Interest. If a Member wishes to transfer all or part of the Member's interest in the Company and the other Members do not consent, the interest or the part of all interest to be transferred must be tendered to the Company by giving written notice of such tender to the Company. Such notice must contain the name and address of the proposed transferee, the price to be paid by the proposed transferee for the interest, if any, and the terms of the proposed transfer. If a Member's interest is transferred by operation of law, the successor in interest to the transferring Member may give the required notice of tender to the other Members at any time following the transfer, and such successor in interest will be deemed to have given the notice of tender at the time any other Member gives notice to the successor in interest and to all other Members of the failure to give the notice of tender. Within 30 days after a notice of tender is given, the other Members may accept the tender on behalf of the Company and have the Company purchase the interest tendered for the lesser of the price set forth in the notice of tender (if the proposed transfer is to be by sale) or the price applicable to the purchase of a Member's interest pursuant to the section of this agreement relating to the effect of member's dissociation. The tender must be accepted on behalf of the Company by giving written notice of acceptance to the transferring Member or the transferring Member's successor in interest. The purchase may, at the option of the other Members, be on the terrns set forth in the notice of tender, if any, or the terms set forth in the section of this agreement relating to payment for member's interest. For purposes of those provisions, the date of the acceptance of the tender will be deemed to be the date on which the other Members elected to purchase the interest of the dissociating Member. 11.5 Effect of Tender. The Member tendering the interest will cease to be a Member with respect to the tendered interest upon an acceptance of the tender by the Company. Thereafter, the Member tendering the interest will have no rights as a Member in the Company, except the right to have the tendered interest purchased in accordance with the terries of this agreement. 11.6 Substitution. If the interest of a Member is transferred, with the consent of the other Members or after the interest has been tendered for sale to the Company in accordance with the section of this agreement relating to tender of interest, the transferee of the interest will be admitted as a Member of the Company effective upon the execution by the transferee and delivery to the Company of a written agreement to be bound by all of the terns and provisions of this agreement. If a Member who is the only member of the Company assigns die Member's entire interest, the transferee will be admitted as a Member of the Company effective upon the transfer. If the transferee is not admitted as a Member, the transferee will only have the right to receive, to the extent assigned, the distributions from the Company to which the transferor would be entitled. The transferee will not have the right to exercise the rights of a Member, including, without limitation, the right to vote or inspect or obtain records of the Company. 12. REPRESENTATIONS AND WARRANTIES OF MEMBERS Each Member represents and warrants to the Company and the other Members that such Member has acquired an interest in the Company for such Member's own account for investment and not with a view to distribution of the interest. 13. INDEMNIFICATION AND LIABILITY LIMITATION 13.1. Indemnification. Except as otherwise provided in this section, the Company must indemnify each of the Managers to the fullest extent permissible under the law of the state in which the Company is organized, as the same exists or may hereafter be amended, against all liability, loss, and costs (including, without limitation, attorneys' fees) incurred or suffered by the Manager by reason of or arising from the fact that the Manager is or was a manager of the Company, or is or was serving at the request of the Company as a manager, member, director, officer, partner, trustee, employee, or agent of another foreign or domestic limited liability company, corporation, partnership, joint venture, trust, benefit plan, or other enterprise. The Company may, by action of the Managers, provide indemnification to employees and agents of the Company who are not Managers. The indemnification provided in this section is not exclusive of any other rights to which any person may be entitled under any statute, agreement, resolution of Managers or Members, contract, or otherwise, But despite any other provision of this agreement, [lie Company has no obligation to indemnify a Manager for: 13.1.1: Any breach of the Manager's duty of loyalty to the Company; 13.1.2 Acts or omissions not in good faith that involve intentional misconduct or a knowing violation of law; 13.1.3 Any unlawful distribution under the Act; or 13.1.4 Any transaction in which the Manager derives improper personal benefit. 1.3.2 Limitation of Liability. No Manager of the Company is liable to the Company or to the Members for monetary damages resulting from the Manager's conduct as a Manager except to the extent that the Act, as it now exists or may be amended in the future, prohibits the elimination or limitation of liability of managers of limited liability companies. No repeal or amendment of this section or of the Act will adversely affect any right or protection of a Manager for actions or omissions prior to the repeal or amendment. 14. MISCELLANEOUS PROVISIONS 14.1 Amendment. The Members may amend or repeal all or part of this agreement by action of the Members, provided that such action is memorialized in writing. This agreement may not be amended or repealed by oral agreement of the Members or by oral or written agreement of the Managers. 14.2 Binding Effect. The provisions of this agreement will be binding upon and will inure to the benefit of the heirs, personal representatives, successors, and assigns of the Members. But this section may not be construed as a modification of any restriction on transfer set forth in this agreement. 14.3 Notice. Except as otherwise provided in other sections of this agreement, any notice or other communication required or permitted to be given under this agreement must be in writing and must be mailed by certified mail, return receipt requested, with postage prepaid. Notices addressed to a Member must be addressed to the Member's address listed in the section of this agreement relating to initial members, or if there is no such address listed fora Member, the address of the Member shown on the records of the Company. Notices addressed to the Company or a Manager must be addressed to the principal office of the Company. The address of a Member, the Company, or a Manager to which notices or other communications are to be mailed may be changed from time to time by the Member's, the Company's, or the Manager's giving written notice to the Members, the Company, and the Managers. All notices and other communications will be deemed to be given at the expiration of three days after the date of mailing. 14.4 Litigation Expense. If any legal proceeding is commenced for the purpose of interpreting or enforcing any provision of this agreement, including any proceeding in the United States Bankruptcy Court, the prevailing party in such proceeding will be entitled to recover a reasonable attorney's fee in such proceeding, or any appeal thereof, to be set by the court without the necessity of hearing testimony or receiving evidence, in addition to the costs and disbursements allowed by Iaw. 14.5 Additional Documents. Each Member must execute such additional documents and take such actions as are reasonably requested by the Managers in order to complete or confirm the transactions contemplated by this agreement. 14.6 Counterparts. This agreement may be executed in two or more counterparts, which together will constitute one agreement. 14.7 Governing Law. This agreement will be governed by the law of the state in which the articles of organization of the Company have been filed. 14.8 Severability. If any provision, of this agreement is invalid or unenforceable, this will not affect the remaining provisions. 14.9 Third -Party Beneficiaries. The provisions of this agreement are intended solely for the benefit of the Members and Managers and create no rights or obligations enforceable by any third party, including creditors of the Company, except as otherwise provided by applicable law. 14,10 Authority. Each individual executing this agreement on behalf of a corporation or other entity warrants that he or she is authorized to do so and that this agreement will constitute the legally binding obligation of the corporation or other entity that the individual represents. IN WITNESS WHEREOF, the parties hereto, have executed the Agreement effective as of the day and�r/first above ritten. 0j IRSDEPARTmENT OF ETREASURY T INTERNAL REVENUESERVICIRY E CINCINNATI OH 45999-0023 RTI LLC ROBERT V TRENT SOLE MBR 424 29TH ST NE STE B PUYALLUP, WA 98372 Date of this notice: 12-02-2009 Employer Identification Number: 27-1404263 Form: SS-4 Number of this notice: CP 57S G For assistance you may call us at: 1-800-829-4933 IF YOU WRITE, ATTACH THE STUB AT THE END OF THIS NOTICE. WE ASSIGNED YOU AN EMPLOYER IDENTIFICATION NUMBER Thank you for applying for an Employer Identification Number (EIN). We assigned you EIN 27-1404263. This EIN will identify you, your business accounts, tax returns, and documents, even if you have no employees. Please keep this notice in your permanent records_ when filing tax documents, payments, and related correspondence, it is very important that you use your EIN and complete name and address exactly as shown above. Any variation may cause a delay in processing, result in incorrect information in your account, or even cause you to be assigned more than one EIN. If the information is not correct as shown above, please make the correction using the attached tear off stub and return it to us. A limited liability company (LLC) may file Form 8832, Entity Classification Election, and elect to be classified as an association taxable as a corporation. If the LLC is eligible to be treated as a corporation that meets certain tests and it will be electing S corporation status, it must timely file Form 2553, Election by a Small Business Corporation. The LLC will be treated as a corporation as of the effective date of the S corporation election and does not need to file Form 8632. To obtain tax forms and publications, including those referenced in this notice, visit our Web site at www.irs.gov. If you do not have access to the Internet, call 1-800-829-3676 (TTY/TDD 1-800-829-4059) or visit your local IRS office. IMPORTANT REMINDERS: * Keep a copy of this notice in your permanent records. This notice is issued only one time and the IRS will not be able to generate a duplicate copy for you. * Use this EIN and your name exactly as they appear at the top of this notice on all your federal tax forms. * Refer to this EIN on your tax -related correspondence and documents. If you have questions about your EIN, you can call us at the phone number or write to us at the address shown at the top of this notice. If you write, please tear off the stub at the bottom of this notice and send it along with your letter. If you do not need to write us, do not complete and return the stub. Thank you for your cooperation. Designated Contact and Officers/Directors/Managers Company Name: RTI LLC Designated Contact: Robert Trent Mailing Address: 424 29t' Street NE Ste B City/State/Zip: Puyallup, WA 98372 Physical Address: Telephone: 253-439-8000 E-Mail Address: roberttrenl@me.com AND the names and physical addresses of its Manager(s)/Member(s) are: Michael Dattilo The above information will be kept current with the Registered Agent annually. I hereby agree and also certify that this information is true and correct to the best of my knowledge. Dated this day of 1V6 v- Signature Title Printed Name CONSENT OF SOLE MEMBER IN LIEU OF SPECIAL MEETING OF RTI LLC The undersigned, being the sole member of RTI LLC, a Wyoming limited liability company (the "Company"), acting without a meeting DOES HEREBY UNANIMOUSLY ADOPT the following resolutions and DOES HEREBY UNANIMOUSLY CONSENT to the taking of the action therein set forth: RESOLVED: that all of the acts and doings of the Members of the Company since the last meeting of the Members, be, and the same hereby are, in all respects ratified, confinned and approved. EURTI ER RESOLVED: that the Members hereby elect the following individual a Manager of the Company, to serve in such capacity until the next annual meeting of the Members of the Company and until successors are elected and qualified. Robert V. Trent The execution of this Consent shall constitute a written waiver of any notice required under the Operating Agreement for RTI LLC. The actions set forth herein shall be effective when this conscnt is executed and in the possession of the Company. Date: April la-_, 2011 Robert V. Trent 00179270.doe TECHNICAL INFORMATION REPORT FOR Federal Way Townhomes Federal Way, Washington August 2013 Prepared for: RTi, LLC 310 29'4 Street NE Puyallup, WA 98372 Prepared by: Steve T. Nelson, PE Project Engineer Reviewed by: ` Craig Deaver, Principal REPORT ,#12074.0 This analysis is based on data and records either supplied to, or obtained by, CES NW INC. These documents are referenced within the text of the analysis. This analysis has been prepared utilizing procedures and practices within the standard accepted practices of the industry. TABLE OF CONTENTS PAGE 1.0 PROJECT OVERVIEW.................................................................................................................................1 1.1 PURPOSE AND SCOPE...................................................................................................................................... 1 1.2 PRE -DEVELOPED CONDITIONS........................................................................................................................ 1 1.3 DEVELOPED CONDITIONS...................................................................... ....................................................... 2 FigureI - TIR Worksheet..................................................................................................................................... 4 Figure 2 - Site Location Exhibit......................................•......................................................................,.......---.10 Figure3 - Basin Exhibits.............................................. ......... .............................. ................................................ 12 Figure4 - Soil Exhibits.......................................................................................................................................1 S 2.0 CONDITIONS AND REQUIREMENTS SUMMARY.............................................................................. 20 +• 2.1 CORE REQUIREMENTS......................................................................................................................... ..... 20 2.1.1 CORE REQUIREMENT # 1 DISCHARGE AT THE NATURAL LOCATION.......................................................... 20 2.1.2 CORE REQUIREMENT #2 OFFSITE ANALYSIS............................................................................................. 20 2.1.3 CORE REQUIREMENT #3 FLOW CONTROL................................................................................................. 20 2.1.4 CORE REQUIREMENT #4 CONVEYANCE....................................................................................................21 2.1.5 CORE REQUIREMENT #5 EROSION AND SEDIMENT CONTROL................................................................... 21 1 2.1.6 CORE REQUIREMENT #6 MAINTENANCE AND OPERATIONS...................................................................... 21 2.1.7 CORE REQUIREMENT #7 FINANCIAL GUARANTEES AND LIABILITY........................................................... 21 2.1.8 CORE REQUIREMENT #8 WATER QUALITY....................................:.......:.......:.........:................................21 j 2.2 SPECIAL REQUIREMENTS..............................................................................................................................22 I I j 3.0 OFFSITE ANALYSIS...................................................................................................................................22 4.0 FLOW CONTROL & WATER QUALITY FACILITY ANALYSIS AND DESIGN .............................26 4.1 EXISTING SITE HYDROLOGY (PART A)......................................................................................................... 26 4.2 DEVELOPED SITE HYDROLOGY (PART B).....................................................................................................27 4.3 PERFORMANCE STANDARDS (PART C)......................................................................................................... 31 4.4 FLOW CONTROL SYSTEM (PART D)..............................................................................................................31 4.5 WATER QUALITY SYSTEM (PART E).............................................................................................................31 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN.............................................................................32 6.0 SPECIAL REPORTS AND STUDIES.........................................................................................................32 7.0 OTHER PERMITS.......................................................................................................................................32 8.0 TESC ANALYSIS AND DESIGN................................................................................................................33 9.0 BOND QUANTITIES, FACILITY SUMMARIES & DECLARATION OF COVENANT....................37 9.1 BOND QUANTITY SHEETS.............................................................................................................................37 9.2 FLOW CONTROL AND WATER QUALITY FACILITY SUMMARY SHEET AND SKETCH ...................................... 38 9.3 DECLARATION OF COVENANT................................................................................................... .42 ................ 10.0 MAINTENANCE AND OPERATIONS MANUAL...................................................................................43 Appendix `A" Stormwater Calculations Appendix `B" Geotechnical Information Geotechnical Report December 20, 2012 Geotechnical Engineering Analysis: Stormwater Infiltration Report June 10, 2013 1.0 PROJECT OVERVIEW 1.1 Purpose and Scope This report accompanies the Civil Engineering Plan submittal for the Federal Way Townhomes as submitted to the City of Federal Way. This document provides site I information and the analysis used for the preliminary storm drainage design. Manuals used to establish the the methodology and design criteria for this project include the 2009 King County Surface Water Design Manual (KCSWDM), the City of Federal Way Addendum to the KCS WDM, the City of Federal Way design standards, and the Low Impact Development Technical Guidance Manual for Puget Sound (December 2012). Figure 1 provides the completed TIR Worksheet for this project. 1.2 Pre -Developed Conditions The project site is located at 2245 S. 333rd Street in the City of Federal Way and is 1 generally rectangular in shape with a slight taper to the eastern property line. Access to J the property is from S 333rd Street located along the northern property line and from a iprivate road easement located along the eastern property line. The site is comprised of a single parcel of approximately 0.64 acres in size and is located in the Residential Multifamily (RM 2400) zoning district. Currently the site contains two single family residences of which one is occupied. The site is sparsely forested with a small stand of cottonwood trees centrally located along the western property line and a mix of deciduous and fir trees located at the north-east corner of the property near the existing residences. Overall the existing site is fairly level with a general slope downward from the north-east to the south-west _ at approximately 0 to 6%. Existing elevations range between Japproximately 370-ft. to 378-ft. The project site is located in the NE'/4 of Section 36, Township 26 North, Range 4 East, W.M., King County, Washington (See Site Location — Figure 2). Total area of the site is 0.64 acres and is bordered to the north by S 333rd Street, to the east by Interstate 5, to the south and west by single family residences also zoned RM 2400 and is located within the Hylebos Drainage Basin. The site is not located within a floodway or flood plain and we are not aware of any known drainage problems associated with the existing site. The USDA Natural Resources Conservation Service (MRCS) Web Soil Survey of King County identifies the onsite soils as Alderwood gravelly, sandy, loam (AgB) ranging from 0-6% slopes and is listed as being in hydrologic class C. A soils report was prepared by GeoResources, LLC in April of 2008 and updated on December 201h, 2012 (see Appendix B) which provides further evaluation of the onsite soils. GeoResources, LLC also provided an additional Stormwater Infiltration Report on June 10, 2013 to specifically address the use of porous asphalt for storm water management. According to the geotechnical report the top layer of onsite soils is a mix of sod/topsoil and forest duff and is approximately one foot thick. Underlying this upper layer is 3 to 4 feet of medium dense weathered till and below that extends very dense glacial till to at least 12 feet below the surface. Isolated minor groundwater seepage was noted at approximately 3.5 to 4.5 feet deep; this was interpreted in the geotechnical report to be Iperched groundwater. The required geotechnical reports have been provided in Appendix 1.3 Developed Conditions _J The proposed Federal Way Townhomes project consists of developing 9 multifamily .� residential townhome units (Building 1 — four unit, Building 2 — three unit, and Building I J- 3 — two unit) on one 0.64 acre parcel. It is anticipated that the project will require approximately 2,100 cubic yards of fill and create only 60 cubic yards of cut. Access to the proposed units will be provided by a paved private drive which runs southerly from the intersection of 24th Avenue South 333rd Street. The project also proposes to dedicate three additional feet of right-of-way along the S 333`d Street frontage as well as providing an additional three feet to the existing 24-foot wide access and utility easement located along the east property line. Curb and sidewalk are proposed to be constructed along the north and east sides of the property to provide pedestrian access. Each proposed townhome unit will contain a two car garage providing 18 parking spaces. Two compact stalls have also been provided for a total of 20 parking spaces. Water and sanitary sewer service to the project will be provided by the existing Lakehaven Utility District (LUD) mains located along the north and south property boundaries. The project proposes to utilize porous asphalt and infiltration to control stormwater runoff. Porous asphalt is proposed to be located in the drive aisle to each building as well P as the private roadway. Proposed roof runoff will be conveyed to a roof downspout system which will direct the stormwater into the crushed stone reservoir located under the drive aisles, where it will be infiltrated back into the ground. Proposed recreation and _ I grassed areas will be graded to collect stormwater runoff to yard drains where the u J stormwater will be directed to small underground infiltration trenches. A small bypass area is located along the north, west and south sides of the property. 13e2 Figure 'I - TIR Worksheet l l l l l -:: 4 - KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL IFIGURE 1 TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1:: PROJECT QWN.�R,:AND PROJECT ENGINEER Project Owner RTI, LLC Phone 253-446-7277 Address 310 29th St. NE, Ste. 101 Puyallup, WA 98372 Project EngineerSteve T. Nelson, PE Company CES NW Inc. Phone 253-848-4282 Pa TY ?&OF PERMIT APPL CATION ❑ Landuse Services Subdivison / Short Subd. / UPD 0 Building Services M/F / Commerical / SFR 0 Clearing and Grading 0 Right -of -Way Use ❑ Other Part.2 PROJECT LOCATION AND DESCRIPTIQN . Project Name Federal Way Townhornes DDES Permit # N/A Location Township 21 N Range 4E Section 16 Site Address 2245 S 333rd St. Federal Way, WA -Part 4 OTHER REVIEWS AND PERMITS ❑ DFW HPA ❑ Shoreline ❑ COE 404 Management ❑ DOE Dam Safety ❑ Structural ❑ RockeryNault/ FEMA Floodplain ❑ ESA Section 7 ❑ COE Wetlands ❑ Other Part-5 PLAN AND'REPORT INFORMATION Technical Information Report Site Improvement Plan (Engr. Plans) Type of Drainage Review Full Targeted / Type (circle one): Full Modified / (circle): Large Site mall Site Date (include revision Date (include revision dates): dates): Date of Final: Date of Final: ';Part E i:-AG7J0STMENT APPROVALS Type (circle one): CStandard Complex / Preapplication / Experimental / Blanket Description: (include conditions in TIR Section 2) Date of Approval: 2009 Surface Water Design Manual 5 1 /9/2009 I KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 7 MONITORING REQUJREMENTS Monitoring Required: Yes / No Describe: Start Date: Completion Date: Part, 8. SITE-.CC)MMUNITY AND PRAINAGE BASIN Community Plan: _City of Federal Way Special District Overlays: Drainage Basin: Hylebos Creek Stormwater Requirements: Conservation Flow Control Area Part 9 .0NSiTE AND ADJACENT SENSITIVE AREAS . ® River/Stream ❑ Steep Slope ❑ Lake ❑ Erosion Hazard ❑ Wetlands _ ❑ Landslide Hazard ❑ Closed Depression ❑ Coal Mine Hazard ❑ Floodplain ❑ Seismic Hazard ❑ Other ❑ Habitat Protection .Pa .1 SOILS L .Part 0 S S Soil Type Slopes Erosion Potential AgB 0-6% Slight 0 High Groundwater Table (within 5 feet) ❑ Sole Source Aquifer ❑ Other ❑ Seeps/Springs ❑ Additional Sheets Attached 2009 Surface Water Design Manual 0 1/9/2009 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 11.: PD AINA..GE. DESIGN LIMITATIONS, REFERENCE 0 Core 2 — Offsite Analysis ❑ Sensitive/Critical Areas 0 SEPA ❑ Other LJ ❑ Additional Sheets Attached LIMITATION / SITE CONSTRAINT Part 12 TIR SUMMARY SHEET r rovlde one TIR Summary Sheet perThreshold Discharge Area Threshold Discharge Area: name or description) Core Requirements (all 8 apply) Discharge at Natural Location Number of Natural Discharge Locations- Offsite Analysis Level: 1 / 2 / 3 dated: Flow Control Level: 1 / 2 / 3 or Exemption Number, Incl. facility summa sheet) Small Site BMPs Conveyance System Spill containment located at: Erosion and Sediment Control ESC Site Supervisor: Arne Michaelsen Contact Phone: 253-279-1371 After Hours Phone: 253-279-1371 Maintenance and Operation Responsibility: rivets / Public If Private, Maintenance Log Required: Yes / No Financial Guarantees and Provided: es / No Liability Water Quality Type: Basic / Sens. Lake / nhanced Basic / Bog (include facility summary sheet) or Exemption No. Landscape Management Plan: Yes / No Special Requirements as a licable Area Specific Drainage Type: CDA / SDO / MDP / BP / LMP / Shared Fac. / one Requirements Name: Floodplain/Floodway Delineation Type: Major / Minor / Exemption 1 None 100-year Base Flood Elevation (or range): Datum: Flood Protection Facilities Describe: N/A Source Control Describe landuse: Commercial (comm./industrial landuse) Describe any structural controls: None 2009 Surface Water Design Manual _7 1/9/2009 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL i TECHNICAL INFORMATION REPORT (TIR) WORKSHEET j I Oil Control High -use Site: Yes / No Treatment BMP: Maintenance Agreement: es)/ No with whom? -City of FederaTWay Other Drainaae Structures Describe: Porous Asphalt/Infiltration Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION 0 Clearing Limits 0 Stabilize Exposed Surfaces 0 Cover Measures 0 Remove and Restore Temporary ESC Facilities 0 Perimeter Protection 0 Clean and Remove All Silt and Debris, Ensure ❑ Traffic Area Stabilization Operation of Permanent Facilities ❑ Sediment Retention ❑ Flag Limits of SAO and open space 0 preservation areas Surface Water Collection ❑Other ❑ Dewatering Control 0 Dust Control 0 Flow Control Part 14 STORMWATI=R FACILITY DESCRIPTIONS Nate: include Facilit Summa and.Sketch Flow Control Type/Description Water Quality Type/Description ❑ Detention 0 Infiltration ❑ Regional Facility ❑ Shared Facility ❑ Flow Control BMPs ❑ Other ❑ Biofiltration ❑ Wetpool ❑ Media Filtration ❑ Oil Control ❑ Spill Control ❑ Flow Control BMPs 0 Other Porous Asphalt 2009 Surface Water Design Manual 6 1/9/2009 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 15 EASEMENTS/TRACTS ❑ Drainage Easement ❑ Covenant ❑ Native Growth Protection Covenant ❑ Tract ❑ Other ;Part 16 -STRUCTURALANALYSIS ❑ Cast in Place Vault 0 Retaining Wall ❑ Rockery > 4' High ❑ Structural on Steep Slope ❑ Other I Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached Technical Information Report. To the best of my knowledge the information provided here is accurate. Sigacd Date 2009 Surface Water Design Manual 1/9/2009 1 Figure 2 - Site Location Exhibit 17 l I I I _10_ 1� I EXHIBIT �;�,. ,,rC FEDERAL WAY TOWNHOMES FIG. 2 CIYlL EHC�lN��i9/Ha �f SUAL'EY/N© null;(2 M 040 aznx mo 29TH ST NE, SUITS rot Fez, ESS 04 -4e70 SITE LOCATION EXHIBIT PUYALLUP. WA 98372 OCPCT4�CPP8gF.I1tlIAF.007A 10o0 ] 5000 1000 2000 1 inch = 1000 it. PROJECT SITE 2245 S 333RD ST FEDERAL WAY, WA. 98003 � O W Q 5� rD 6-11-13 Fiuure 3 - Basin Exhibits -12- SOIL TYPE: ALDERWOOD (AgB) TOTAL BASIN AREA: GRAVELLY SANDY LOAM, 0 TO 6 36,146 SQ. FT. PERCENT SLOPES EXISTING: EX. PGIS (PUBLIC) = 5,538 SQ. FT. EX. PGIS (PRIVATE) = 3,919 SQ. FT r — EX. IMP SURF = 2,410 SQ. FT. I 1 PERV = 24,279 SQ. FT. I ! I I I 1 ICn I I t I I € � I I l - IL — — — — — — J 1 Ir EXISTING BASIN -}66J /III soa i 4 al'BASIN--,, w xsa.ol' -4/To _ .— 1 —31A� J � S / n 11 r�1�1 / �� I I • .. 1 p•. L— m e — ---IV, O / .1PROPOSED EDGE OF • I' I PRIVATE DRIVE p y 4 • �+ S 9014'1_ p.20' EX. PAVING IN THIS AREA TO BE REMOVED AND REPLANTED WITH SOD Imm� 4 GRAPHIC SCALE N Z I - ,`oI 60 C 30 60 V OHi 1 •' _ — _ IN FEET F 1 inch = 30 ft. 1 - I 1 mil a NCI 0 I col I I L� —_ Igo i� I� oca I� I� I � I I � I a I I o I I � I O I L_ �I I 247H AVE S. (009% 60' R.O.W.) FIGURE 3 LLJ N ��N� �j u � 4 ON W y z W N� a Ma V C n N ti W er d N � a a V -' � m � Z � W o W W W W Z LL W -• o1 N O N O C O C] a` V Designed: STN Drawn: STN Checked: CAD Scale: 1" = 30' Date: 7-15-13 Job No.: 12074 Sheet No.: 131 1 of 2 Sheets 13 TOTAL DEVELOPED BASIN AREA: 32,920 SQ. FT. BASIN BLDG A & B (POROUS ASPHALT): ROOF = 4,872 SQ. FT. (0.1118 AC) DRI VE AISLE = 2,781 SQ. FT. (0.0638 AC) TOTAL = 7,653 SQ. FT. (0.1723 AC) BASIN BLDG C (POROUS ASPHALT): ROOF = 1,428 SQ. FT. (0.0328 AC) DRI VE AISLE = 957 SQ. FT. (0,0220 AC) TOTAL = 2,385 SQ. FT. (0.0548 AC) co BYPASS BASIN BASIN BLDG C r INFILTRATION AREA (640 SQ. FT.) PRIVATE DRIVE BASIN (POROUS ASPHAL): STANDARD PAVING = 757 SQ. FT. (0.0174 AC) SIDEWALK/CURB = 1,316 SQ. FT. (0.0302 AC) POROUS ASPHALT = 4,495 SQ. FT. (0.1032 AC) TOTAL = 6,568 SQ. FT. (0,1508 AC) BYPASS BASIN: STANDARD PAVING = 3,987 SQ. FT. (0.0915 AC) GRASS = 307 SQ. FT. (0.007 AC) SIDEWALK = 810 SQ. FT. (0.0186 AC) LANDSCAPE = 3,658 SQ. FT. (0.0840 AC) TOTAL = 8,762 SQ. FT. (0.2011 AC) SIN BLDG C m i • PRIVATE DRIVE BASIN REC SPACE S BASIN: 2'" PATIO = 1,000 SO. FT. (0.0230 AC) GRASS/PLANTER = 3,621 SQ. FT. (0,0831 AC) o 1 TOTAL = 4,621 SQ. FT. (0.1061 AC) REC SPACE N BASIN: PATIO = 800 SQ. FT. (0.0184 AC) GRASS/PLANTER = 2,131 SQ. FT. (0.0490 AC) TOTAL = 2,931 SQ. FT. (0.0673 AC) �'T�� x I �Z�=s m�Vvn' �p pW W Oo C b r-------� a�Nir tim0�2 s�v i I 1 I ! I I I I r I I REC SPACE N BASIN INFILTRATIO AREA I REC SPACE S BASIN 600 SQ. FT.) I INFILTRA110N AREA — — — — — — -' (960 SQ. FT.) BYPASS BASIN BASIN BLDG A & B INFILTRATION AREA BASIN LDG i (1,680 SQ. FT.) A & B� 7 i N' o 1TR z n A710 EX. PAVING IN THIS AREA TO BE REMOVED AND REPLANTED WITH SOD SPACE N BASIN A AL T Ijilliliplill f - � f I �m GRAPHIC SCALE C �g 30 0 15 30 g� i� D{� S ( IN FEET) M - �_� 1 inch = 30 ft. M I "' f N SOIL TYPE: ALDERWOOD (AgB) GRAVELLY SANDY LOAM, 0 TO 6 PERCENT SLOPES f I I I I i I I I I I L--- I I all - - I BYPA S BASIN F I i � � I I , I I , 1 I , l L I I ! PRIVATE oN0 h y Ic � su • W 0n Z� W �a s � LYl/1 N n W `° 0 N = 0- Z 0 Z cry U m J � o Q a O W W o a cm W w � z W w W U. H U) 0) N U m - o O a` � M U Designed: STN Drawn: STN Checked: CAD Scale: 1" = 30' Date: 7-15-13 Job No.: 12074 Sheet No.: PIO FIGURE 3 2 of 2 Sheets I- Figure 4 - Soil Exhibits - 15 - W CD LL m E 0 r C 0 0 H V.BL .ZZL .8 L .BL .ZZL N 1. p 'Al ML .ZZL W O 0 Z W a W J a Ca C O O C cma — w O CI N E l0 �j L N y �i �$ �' c v 0. a�iv o ymE cy� N y d E E x �a) am �1 N C C (n O O y LO 3 U E l ocEE Ly C • p0 i iaN E ao Y C A Q � �Nar1O E U) � mc�i P! 0 c�' m �� y ¢ 'o m 'U m (D E o a� m a) ¢� o o �'v am 0 m EE o N 3o af0i c 0 o moo. ; cry r E� 0 w aoC N N p 0 a NO >, a a E�N E v-- y 0- N Ia -� in X N t .CD C C m 'p E E ,� o Mp a Z� m=_ a> 0�0 'o m E rn E aEi a m 'a :° 1° i Z _ O E f0 � 7 O� N (n N V Q la t C a .O N E �'� N {a E � o� m O a aTi Z¢ oa-1p0�'c L O .0 0 c E N 0 me EL m y a) � m m C �Nv O CL(D ' > Z h °� O �• tf• N a E E a F N$ w E nai a E �a o in�C) y IL-« wU) o m m ff y O C {a 0 o M C Ti U co (n y a O1 y 0 >. a C = y N D C B N ram.. O M b w E o 0tf �p LL =, O L_ p y a) N y U > O J t9 N O U (n c a 5 LL A q N ` I0 O t a a. 3 p m n y O_ �p N O w 3 w m 3 ci o. ua o m o O C. a n C a >, o o d m U U >, w c m rn Q o LL 00 3 �i d LL L o c O d o `o O Q Rqt > la w N U C e C 'a N Y y O C O Zr O O O > �a > la C y y O 10 N N C O O- O Q rn o m m L) U c� c� � 3 a rr m m co m m rn CO) in d a c m o d 3 ® X • k @ < Qc O O > + .. I�I o, ty !ff 1 !A WA vF�- m 'o W 7 N U fa O Ena C O U i0 0 M Z Soil Mao --Kind Countv Area. Washington Map Unit Legend FIGURE 4 1 FWTownhomes King County Area, Washington (WA633) Map Unit Symbol Map Unit Name Acres In AOI Percent of AOI AgB Alderwood gravelly sandy loam, 0 to 6 6.0 100.0% percent slopes Totals for Area of Interest 6.0 100.0% USDA Natural Resources ma" Conservation Service Web Soil Survey National Cooperative Soil Survey l'0 6/10/2013 Page 3 of 4 F7(FdBIT C�,, . ,0VC FEDERAL WAY TOWNHOMES FIG. 4 CIP& AMP"RINa J O ° IFRn d-4P 310 207N ST NE, SU17E 101 p.x� t63 $40_437a SOIL DESCRIPTION PUYALLUP. WA 00372 oaeariraae�aewxWa.aam Alderwood gravelly sandy loam, 0 to 6 percent slopes (Ag)3) This soil is nearly level and undulating. II is similar to Alderwood gravelly sandy loam, 6 to 15 percent slopes, but in places, its surface layer is 2 to 3 inches thicker. Areas are irregular in shape and range from 10 acres to slightly more than 600 acres in size. Some areas .arc as much as 15 percent included Norma, Bellingham, Tukwila, and Shalcar soils, all of which are poorly drained; and some area,; in the vicinity of Enumclaw are as much as 10 percent Buckley soils. Runoff is slow, and the erosion hazard is slight. This Alderwood soil is used for timber, pasture, berries, row crops, and urban development. Capability unit IVe-2; woodland group 3d2. 6-10-13 Page 4 of 4 'I 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Core Requirements The storm water facilities for this project were evaluated in accordance with the 2009 King County Surface Water Design Manual (KCSWDM) as supplemented by the Federal Way Surface Water Design Manual (FWSWDM). Compliance with these manuals is outlined below. 2.1.1 Core Requirement #1 Discharge at the Natural Location The project site has natural or existing grades that slope very moderately southerly and westerly. Site discharge travels as sheet and shallow flow toward the southwest. No channeling or concentrated flows were observed. A small area covering the southeastern portion of the access drive drains southerly toward an existing off -site development. The proposed development of the property will maintain this general natural discharge pattern in general accordance with FWSWDM standards. The existing site conditions are further described in Section 3 of this report. 2.1.2 Core Requirement #2 Offsite analysis. The offsite analysis is provided in Section 3.0 later in this report. 2.1.3 Core Requirement #3 Flow Control. Level 2 Flow Control standards are proposed for the project in accordance with FWSWDM criteria. The project is located in an area that the City of Federal Way has designated as a Conservation Flow Control Area. -20- -1 1 2.1.4 Core Requirement #4 Conveyance Summarized in Section 5 - The project proposes to utilize porous asphalt and infiltration, therefore no conveyance piping is proposed. Proposed drainage systems are designed to convey the 100-year peak flows for the proposed development. 2.1.5 Core Requirement #5 Erosion and Sediment Control Described in Section 8 - The erosion control plan has been designed to meet or exceed the applicable requirements of the City of Federal Way. Proper ongoing monitoring and I maintenance will be required. An erosion and sediment control plan will be provided during the formal engineering plan review. 2.1.6 Core Requirement #6 Maintenance and Operations The proposed on -site private drainage facilities will be privately maintained and operated. Facility maintenance and operations information is located in Section 10 of this report. 2.1.7 Core Requirement #7 Financial Guarantees and Liability See Section 9 - Bond Quantity Worksheet City of Federal Way requirements for financial guarantees and liability will be met. 2.1.8 Core Requirement #8 Water Quality The project proposes to utilize Low Impact Development (LID) Techniques for quantity and quality mitigation. Porous asphalt and subsurface infiltration is proposed to be utilized. Enhanced water quality treatment will be achieved by infiltrating 100% of the annual stormwater runoff from the patios, and paving through porous asphalt into the subgrade below. Stormwater that does not infiltrate directly into the recreation spaces and landscape buffers will flow overland to yard drains where the stormwater will be -21- infiltrated via gravel trench beds. Test results from onsite sampling show the soils contain a cation exchange capacity between 16.4 and 22.2 milliequivalents (mEq)/100 grams dry soil (required minimum 5 mEq/100 grams), organic matter between 5.1 and 9.6 percent (required minimum 0.5 percent) and a measured onsite infiltration rate of 2 inches/hr (maximum allowed 12 inches/hr). Several small bypass areas located on the north, west and south sides of the project will be allowed to be released undetained and untreated. Total release of the bypass areas is less than 0.10 cfs for the 100 year return period. 2.2 Special requirements #1. As previously mentioned, the site is within the City of Federal Way Hylebos Creek Drainage basin and is inside of the Conservation Flow Control Area. #2. The site does not lie within a floodway or floodplain. #3. Flood protection Facilities are not applicable. #4. Enhanced Basic Water Quality Treatment is required since this is a multi -family J development. J#5. Oil control will be provided by the porous asphalt and subgrade configuration. Additional City of Federal Way Project Requirements: 1. Road Modification: The City of Federal Way granted a roadway modification for Jthe project (Permit No.: 07-100630-00-SM) in February 25, 2008. This Road Modification has since expired. It is the applicants desire to obtain re -approval of Jthis Road Modification. The project site has been designed based upon the previous approval of this modification. The modification will allow a non- standard street section along the private drive that runs north -south along the eastern boundary of the project. 3.0 OFFSITE ANALYSIS A Task 1: Study Area Definition and Maps -22- J The project site is fronted by South 333rd Street along its north property line and is located west of 24th Ave South. There are two existing single family residences located on the parcel near the northern property boundary. The properties south and west of the 1� site are developed. Interstate 5 borders the property on the east. More generally, the site is located in the SW 1/4 of Section 16, Township 21 North, Range 4 East of King County, Washington (see Figure 2, Vicinity Map). The project site has a total area of 0.64 acres. Task 2: Resource Review I No wetland or stream resources are located on the g project site according to observations p J and available data. The project lies in an area that has a low probability of ground water contamination per current King County GIS-resources. No drainage complaints are listed for the project site or the surrounding properties. The project site is not located within a delineated 100-year flood plain area. An unnamed stream flows north to south and is located approximately 100 feet west of the property. The stream enters a 42 inch pipe located on the north side of S 333`d Street and flows south underground for approximately 450 feet where it daylights back into the stream channel. - Task 3: Field Inspection A field investigation of the site was conducted on Wednesday January 3.0, 2013. The Jweather was overcast with light rain and an approximate temperature of 50' F. This investigation included observation's of current land use, ground cover, existing drainage -� patterns and topography. - 23 - r J Two single-family residences are located on the subject property, but only one residence ti is inhabited. Properties neighboring on the west and south are developed with single- family residences. 1 The site is sparsely forested with a small stand of cottonwood trees centrally located along the western property line and a mix of deciduous and fir trees located at the north- east corner of the property near the existing residences. Overall the existing site is fairly level but generally slopes downward from the north-east to the south-west at approximately 0 to 6%. These existing site conditions are shown in Figure 3 — Pre - developed Basin Map. Downstream Basin ' Storm water runoff from the existing site flows as sheet flow toward an unnamed stream. 1 This stream flows north to south and is located approximately 100 feet west of the property. The stream enters a 42 inch pipe located on the north side of S 333`a Street and flows south, underground for approximately 450 feet where it daylights back into the stream channel. 5 The surface water runoff travels in a southwesterly direction onto the neighboring properties before eventually entering unnamed stream mentioned above. The neighboring properties are currently developed with multi -family residential lots and are mostly cleared with moderate landscape cover and paved driveway areas. Upstream Basin C I Topography and the improved conditions of South 333rd Street limit off -site, upstream runoff contributions to a portion of the paved roadway area north of the site. The area east of the site contains the shoulder and slope areas of Interstate 5. This area is covered in grass, shrubs and small trees and contains a drainage swale which prevents stormwater from entering the project site. 1 Task 4: Drainage System Description The on -site storm water collection and water quality systems supporting this project are proposed igeneral accordance with the provisions of the Federal Way Surface Water p n Design Manual (FWSWDM). The project proposes to utilize Low Impact Development (LID) Techniques for quantity and quality mitigation. Porous asphalt and subsurface infiltration is proposed to be utilized. Enhanced water quality treatment will be achieved by infiltrating 100% of the annual stormwater runoff from patios, and paving through porous asphalt into the subgrade below. Roof runoff will be conveyed to a roof downspout system which will direct the stormwater into the crushed stone reservoir located under the drive aisles, where it will be infiltrated back into the ground. Stormwater that does not infiltrate directly into the recreation spaces and landscape buffers will flow overland to yard drains where the stormwater will be infiltrated via gravel trench beds. Test results from onsite sampling show the soils contain a cation exchange capacity between 16.4 and 22.2 milliequivalents (mEq)/100 grams dry soil (required minimum 5 mEq/100 grams), organic matter between 5.1 and 9.6 percent (required minimum 0.5 percent) and a measured onsite infiltration rate of 2 inches/hr (maximum allowed 12 inches/hr). - 25 - 4 ._ J " l Several small bypass areas located on the north, west and south sides of the project will be allowed to be released undetained and untreated. Total release of the bypass areas is less than 0.10 cfs for the 100 year return period. The proposed site drainage improvements are shown on Figure 3 — Developed Basin Map B-2 of this report Task 5: Mitigation of Existing or Potential Problems i There are no documented downstream flooding or drainage system problems that would require specific mitigation by the proposed project. Temporary Erosion and Sedimentation Control (TESC) measures will be implemented during construction operations in accordance with development standards. All TESC facilities will be actively inspected and maintained by the contractor during construction to minimize l impacts to the downstream system as described in Section 8 of this report and the project J plans. 4.0 FLOW CONTROL & WATER QUALITY FACILITY ANALYSIS AND DESIGN 4.1 Existing Site Hydrology (Part A) The hydrologic analysis for the project site is based on drainage characteristics such as a basin area, soil type, and land use (i.e., pervious, impervious, density). The Western Washington Hydrology Model 2012 (WWHM2012) software was used to evaluate the Jstorm water runoff conditions for the project site and design the stormwater facilities. The USDA Natural Resources Conservation Service (MRCS) Web Soil Survey of King County identifies the onsite soils as Alderwood gravelly, sandy, loam (AgB) ranging from 0-6% slopes and is listed as being in hydrologic class C. In order to model the existing -26- J site conditions pervious surfaces were considered to be flat, Type "C", Pasture land cover. The project site is located in the SeaTac Rainfall Region therefore a modeling scale factor of 1.0 was used. Following is a summary of the analysis: Existing and proposed drainage basins are shown on Figure 3 basin maps B-1 (Pre - developed) and B-2 (Developed). Since this project proposes to infiltrate the stormwater onsite the Pre -developed conditions are provided only to compare the existing flows to the proposed Bypass Basin. Pre -developed conditions were considered to be cleared and partially improved. Table 1 4.1.1 summarizes the Existing Basin area and the WWHM2012 input parameters used in 1 the analysis. Table 4.1.2 summarizes the discharge generated under pre -developed conditions. Table 4.1.1 - Existing Drainage Area Summary Land Cover (acres) Basin ID Total Area Impervious Impervious C, Pasture, Flat (acres) Roads, Flat Roof, Flat Existing 0.8296 0.217 0.0553 1 0.5573 Appendix A of this TIR contains the W WHM2012 model results Table 4.1.2 — Predeveloped Basin Discharge Rates Basin ID 2 r cfs 5 r cfs 10yr (cfs) 25yr (cfs) 50yr cfs) 100yr (cfs Existing 0.081554 0.105627 0.122645 0.145426 0.163354 1 0.182127 4.2 Developed Site Hydrology (Part B) The site will be re -graded and existing services/facilities will be extended to + accommodate the proposed multi -family residential improvements. The proposed porous asphalt, Recreation Spaces and landscape buffers are designed to generally maintain the existing discharge patterns of the project site by infiltrating the majority of the stormwater -27- runoff. Figure 3 Basin Map B-2 shows the proposed grading and drainage improvements and sub -basin delineation for the developed site. i Table 4.2.1 summarizes the Developed Bypass Basin area and the WWHM2012 input parameters used in the analysis. Table 4.2.2 summarizes the discharge generated under 1 developed conditions. Table 4.2.1— Developed Bypass Drainage Area Summary Land Cover (acres) Basin ID Total Area Imp. Roads, Imp. SW, C, Lawn, C, Lawn, (acres) Flat Flat Flat Mod Bypass 0.2011 0.0915 0.0186 0.007 0.084 Table 4.2.2 — Developed Bypass Basin Discharge Rates Basin ID 2 r cfs 5 r cfs 10 r cfs 25 r cfs 50 r (cfs) 100 r cfs) Bypass 0.033176 0.043314 0.050526 0.060228 0.067896 0.075955 It is important to note that under developed conditions the bypass basin will discharge less than 0.10 cfs under the 100 year return period as compared to the current existing condition of 0.18 cfs. Table 4.2.3 summarizes the Developed Basin areas and the WWHM2012 input parameters used in the analysis. Areas of porous asphalt were modeled as C, Lawn, Flat. Table 4.2.3 — Developed Drainage Area Summary - 28 - Basin ID Total Area (acres) Land Cover (acres) Imp. Roads, Flat Imp. SW, Flat Imp. Roof, Flat Porous Asphalt, Flat* C, Lawn, Flat FWTB Bldg A-B 0.1118 0.1118 0.0638 FWTH Bldg C 0.055 0.0328 0.022 FWTH PriRoad 0.1508 0.0174 0.0302 0.1032 FWTH Rec Sp N 0.0674 0.0184 0.049 FWTH Rec Sp S 0.1061 0.0230 0.0831 Porous Asphalt was modeled as C, Lawn, Flat in the W WHM2012 modeling. 1 The project proposes to infiltrate 100% of the stormwater utilizing porous paving and gravel trench beds. Quantity mitigation and enhanced water quality treatment will be achieved by infiltrating 100% of the annual stormwater runoff from patios, and paving through porous asphalt into the subgrade below. Roof runoff will be conveyed to a roof downspout system which will direct the stormwater into the crushed stone reservoir located under the drive aisles, where it will be infiltrated back into the ground. Stormwater that does not infiltrate directly into the recreation spaces and landscape buffers will flow overland to yard drains where the stormwater will be infiltrated via gravel trench beds. Onsite Infiltration testing was performed by GeoResources, LLC on May 28, 2013 (see Appendix B, Stormwater Infiltration Report, dated June 10, 2013). Test results from 1 onsite sampling show the soils contain a cation exchange capacity between 16.4 and 22.2 r milliequivalents (mEq)/100 grams dry soil (required minimum 5 mEq/100 grams), organic matter between 5.1 and 9.6 percent (required minimum 0.5 percent) and a __l measured onsite infiltration rate of 2 inches/hr (maximum allowed 12 inches/hr). Therefore, the existing on -site soils gualify for enhanced water qu&V treatment and no soil amendment is necessary. =29- According to the infiltration report, storm water infiltration rates were determined in accordance with the 2009 King County Surface Water Design Manual (KCSWDM) and Appendix C Section 2.6 for Permeable Pavement. After application of the appropriate formula the long term infiltration rate was determined to be 0.42 inches per hour. Due to the high percentage of fines the long term design infiltration rate recommended by the report is 0.22 inches per hour (including the factor of safety). However, the southern portion of the site contains a higher percentage of fines; therefore the report recommends Ian approximate factor of safety of 4 which provides an infiltration rate of 0.11 inches per hour for Basin ID FWTHBldg C. While the 0.22 inches per hour may be used for the rest of the project site. Utilizing the above mentioned infiltration rates and basins the porous asphalt road sections are as follows per the WWHM2012 calculations: Table 4.2.4 — Porous Asphalt Road Section Design Basin ID Porous Asphalt Thickness (inches) Choker Layer Thickness (inches) Reservoir Layer Thickness inches Bldg. A & B 4 2 25 Bldg. C 1 4 2 30 Private Drive 1 4 1 2 8 Assumptions utilized in the design of these paving sections include: 1. 15% pour space for the porous asphalt. t 2. 35% pours space for the choker and reservoir layers. 3. Ponding depth of 0.1 foot (maximum). 4. Pavement slope of 1 %. Under the design as shown above it is anticipated that the porous asphalt and underlying reservoir layer will be able to stor and infiltrate 100% of the stormwater. All of the WWHM2012 calculations have been provided in Appendix A. -30- 4.3 Performance Standards (Part C) Storm drainage facilities for this project are designed in accordance with the current FWSWDM. Required performance standards are outlined below: Table 4.3.1 - Performance Standards Facility Flow Control Standard Water Quality Treatment Standard Porous Asphalt/ Level 2 (Conservation Enhanced Basic Water Infiltration Flow Control) Quality 4.4 Flow Control System (Part D) Conservation Flow Control is required for this project and is being mitigated for by the construction of porous asphalt and subsurface infiltration. All of the WWHM2012 calculations have been provided in Appendix A. 4.5 Water Quality System (Part E) Enhanced water quality treatment will be achieved by infiltrating 100% of the annual stormwater runoff from patios, and paving through porous asphalt into the subgrade below. Roof runoff will be conveyed to a roof downspout system which will direct the stormwater into the crushed stone reservoir located under the drive aisles, where it will be infiltrated back into the ground. Stormwater that does not infiltrate directly into the recreation spaces and landscape buffers will flow overland to yard drains where the stormwater will be infiltrated via gravel trench beds. Onsite Infiltration testing was performed by GeoResources, LLC on May 28, 2013 (see Appendix B, Stormwater Infiltration Report, dated June 10; 2013). Test results from onsite sampling show the soils contain a cation exchange capacity between 16.4 and 22.2 -31- milliequivalents (mEq)/100 grams dry soil (required minimum 5 mEq/100 grams), organic matter between 5.1 and 9.6 percent (required minimum 0.5 percent) and a measured onsite infiltration rate of 2 inches/hr (maximum allowed 12 inches/hr). Therefore the existing on -site soils qualify for enhanced water uali treatment and no soil amendment is necesss +_. All of the WWHM2012 calculations have been provided in Appendix A. 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN The project is proposing no underground conveyance piping therefore no conveyance Ianalysis has been provided. It is however, important to note that the project proposes to infiltrate 100% of the onsite stormwater utilizing porous asphalt. 6.0 SPECIAL REPORTS AND STUDIES Along with this preliminary storm drainage report (TIR) we are providing a Geotechnical Engineering Study and Stormwater Infiltration Report both prepared by GeoResources, ILLC. There are no other known special reports or studies. JThis drainage analysis and the future site construction documents will ultimately need to meet all the conditions of the project approval. 7.0 OTHER PERMITS Permits to be obtained prior to site development approval for the project include: JCommercial Site Development Permit — City of Federal Way • Right-of-way Use Permit — City of Federal Way • Multi -family Building Permit — City of Federal Way JThe following permits/entitlements exist for the project: • Use Process II Site Plan Review — City of Federal Way J -32- J I Water and Sewer Developer Extension Agreement — Lakehaven Water and J Wastewater District Landscape plans, street light plans, and retaining wall design will all require approval as part of the engineering permit approval. No other known permits are required at this time. 8.0 TESC ANALYSIS AND DESIGN Site specific details and provisions for temporary erosion and sediment control (TESC) facilities are provided with the site improvement plans that accompany this TIR. The proposed facilities have been selected in accordance with FWSWDM standards. In addition to these site -specific TESC measures, the following general Best Management i Practices (BMPs) for sediment control shall also be implemented: Measures Taken to Control Sediment: 1 1. Clearing Limits J Construction clearing limits fence or silt fence will be installed by the contractor along the entire project corridor to prevent disturbance of project areas not designated for construction. These fences will be installed prior to clearing and grading activities where appropriate. J 2. Cover Measures Temporary and permanent cover measures will be provided by the contractor to protect disturbed areas. Disturbed areas will be seeded and mulched to provide permanent cover Jmeasure and to reduce erosion within seven days, if those areas not scheduled for immediate work. J 3. Perimeter Protection J -33- J The contractor will install silt fences as indicated on the drawings prior to any up slope clearing, grading and trenching activities in order to reduce the transport of sediment 1 offsite. 4. Traffic Area Stabilization Stabilized pads of quarry spalls will be installed by the contractor at all egress points from the project site as required to reduce the amount of sediment transported onto paved roads or other offsite areas by motor vehicles. 5. Sediment Retention 1 Sediment retention will be provided by silt fencing and catch basin inlet protection at the 1 locations and dimensions shown on the project drawings. 1 6. Surface Water Control i Surface water control will include ditches, temporary culverts check dams, and/or other inlet and outlet protection as required and/or at the locations and dimensions shown on the drawings. J7. Dust Control JWater and/or street sweeping equipment will be used by the contractor to control dust emissions during construction operations as required. J 8. Wet Season Requirements JIf soils are exposed during the period of October 1 to March 31, the contractor will mulch Jand seed or otherwise cover as much disturbed area as possible by the first week of October, in order to provide protective ground cover for the wet season. The contractor Jwill also conform to the following wet season special provisions: A. Apply cover measures to disturbed areas that are to remain unworked for Jmore than two days. I -34- J B. Protect stockpiles that are to remain unworked for more than 12 hours. No area is to be left uncovered/denuded longer than 12 hours during the winter months. C. Provide onsite stockpiles of cover materials sufficient to cover all disturbed areas. D. Seed all areas that are to be unworked during the wet season by the end of the first week of October. E. Apply mulch to all seeded areas for protection. F. Provide onsite storage of 50 linear feet of silt fence (and the necessary stakes) for every acre of disturbed area. Straw bales are to be stockpiled onsite for use in an emergency. G. Provide construction road and parking lot stabilization areas for all sites. H. Provide additional sediment retention as required by the City of Federal Way Engineer. 1 I. Provide additional surface water controls as required by the City of Federal Way JEngineer. J. Implement construction phasing and more conservative BMPs for construction Jactivity near surface waters (to be evaluated). 1 K. Review and maintain TESC measures on a weekly basis and within 24-hours after J any runoff -producing event. J9. Sensitive Areas Restrictions JThe project site lies in proximity to a Type 2S stream. The project also lies within an area that has a low susceptibility to ground water contamination. In accordance with current JCity of Federal Way standards, the project will not be subject to any additional sensitive Jarea restrictions/requirements. The project does not require any disturbance of soils within steep slope or erosion hazard Jareas. Construction shall be limited to the dry season (April 1 to September 30). If -35- J .I l weather or construction conditions result in erosion or sediment discharge, or if additional I sensitive areas are identified during construction, the Contractor will install additional controls to meet the requirements of Section D.5.3, and as approved by the Engineer. 10. Maintenance Requirements All TESC measures will be maintained and reviewed on a regular basis following the standard maintenance requirements identified in the project drawings. A TESC supervisor will be designated by the contractor and the name, address and phone number of the TESC supervisor will be given to the City prior to the start of construction. A sign will be posted at the primary entrance to the project site identifying the TESL supervisor and his/her phone number. The TESC supervisor will inspect the site at least once a month during the dry season, weekly during the wet season, and within 24 hours of each runoff -producing storm. A standard TESC maintenance report will be used as a written record of all maintenance. J The contractor will be responsible for phasing of erosion and sediment controls during construction so that they are coordinated with construction activities. The contractor will l also be responsible for maintenance of temporary controls during construction, including J removal of accumulated sediment, and for the removal of the controls and remaining accumulated sediment at the completion of construction. 11. Final Stabilization Prior to obtaining final construction approval, the site shall be stabilized, the structural JESC measures removed and drainage facilities cleaned. To obtain final construction approval, the following conditions must be met: JAll disturbed areas of the site should be vegetated or otherwise permanently stabilized in Jaccordance with project BMPs. At a minimum, disturbed areas should be seeded and mulched to provide a high likelihood that sufficient cover will develop shortly after final I -36- J approval. The plans include erosion control notes and specifications for hydro -seeding and mulching disturbed areas. Structural measures such as silt fences, pipe slope drains, storm drain inlet protection and - sediment traps shall be removed once the proposed improvements are complete and I vegetated areas are stabilized. All permanent surface water facilities shall be cleaned completely and restored to working order prior to removal of TESC facilities. 9.0 BOND QUANTITIES, FACILITY SUMMARIES & DECLARATION OF COVENANT 9.1 Bond Quantity Sheets Bond quantity sheets will be provided prior to engineering approval. -37- 9.2 Flow Control and Water Quality Facility Summary Sheet and Sketch Level 2 Flow Control and Enhanced Water Quality are required for this project. Low Impact Development (LID) Techniques are proposed to provide quantity and quality mitigation. Porous pavement and infiltration have been proposed to provide mitigation. See the following for the stormwater facility summary sheet and sketch. The project is within the City of Federal Way designated Hylebos drainage basin. -38- J I I J KING COUNTY, WASHING'TON, SURFACE; WATER DESIGN MANUAL STORMWATER FACILITY SUMMARY SHEET DDES Permit Number 1 (provide one Stormwater Facility Summary Sheet per Natural Discharge Location) Overview: Project Name Federal Way Townhomes Date Downstream Drainage Basins Major Basin Name Puyallup/White (WRIA 10) Immediate Basin Name Hylebos Creek Flow Control: Flow Control Facility Naine/Number __ Infiltration Facility Location Onsite If none, Flow control provided in regional/shared facility (give location) No flow control required Exemption number General Facility Information: Type/Number of detention facilities: Type/Number of infiltration facilities: ponds ponds vaults v —tanks tanks 2 trenches 3 Porous Asphalt Control Structure Location N/A Type of Control Structure Porous Asphalt N/A J Size of Orifice/Restriction: No. 1 No. 2 No. 3 J No. 4 Flow Control Performance Standard 2009 King Co SWDM/Federal Way Addendum to SWDM J 2009 Surface Water Desi n Manual 3�% g Number of Orifices/Restrictions 1/9/2009 J KING COUNTY, WASHINGTON, SURFACE. WATER DL'S1GN MANUAL Live Storage Volume N/A Depth N/A Volume Factor of Safety Number of Acres Served 0.83 Number of Lots N/A Dam Safety Regulations (Washington State Department of Ecology) Reservoir Volume above natural grade N/A Depth of Reservoir above natural grade N/A Facility Summary Sheet Sketch All detention, infiltration and water quality facilities must include a detailed sketch. (11 "x17" reduced size plan sheets may be used) 2009 Surface Water Design Manual I-q 1/9/2009 DRAINAGE NOTES I. PROOF OF LIABILITY INSURANCE SHALL BE SUBMITTED TO THE CITY PRIOR 1'G OR AT, THE PRECONSTRUC110N MOM 2. ALL PIPE ND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED FOUNDATION N ACCORDANCE WITH WSDOT SPECFICATONS. THIS SHALL waDOE LEam AND COMPACTING THE TRENCH BOTTOM, THE TOP OF FOUNDATION MATERIAL, AHD REQUIRED PPE BEDOPIG, TO A UNFCIW GRADE SO THAT THE ENTIRE PPE IS SUPPORTED BY A INIFORNLY DENSE UNYIELDING BASE: I ALL PPE N THE ROW THAT IS N EXCESS OF WIN 014M MUST BE FLAN OR REINFORCED COMM ADDITIONALLY, F MOM THAN 100' OF NON- ONCEIE PPE IS INSTALLED, THE PPE MUST BE VDEOED TO VERIFY TIE KTEBRITY OF THE COMPLETED SYMM THE CONTRACTOR SHALL PROVIDE A COPY 0' THE VIDEO TO THE CRY. 4. STORM PIPE WITHIN THE PUBLIC RIGHT OF WAY SHALL HAM£ A MNNW DIAMETER OF 1T (I' DI"TER DUM IRON PPE MAY BE PaUTTED ON CROSS STREET IATRAS LESS THAN 66 FEET LING ONLY TO AVOID VWMTY MR = OR MEET SHALLOW OIADEAT AS APPROVED BY THE PUBLIC WORKS DEPARTWNrL 5. STU PIPE SHALL BE GALVAHIVFD AND HAVE ASPHALT TREATMENT 11 OR BETTER NSDE AND OUTSIDE. 6. ALL DRAINAGE SIRUCRI110, SUCH AS CATCH BASINS AND MANHOLES, NOT LOCATED WITHIN A TRAVELED ROADWAY CR SIDEWALK SHALL HAZE SOLID LOOCO LIM ALL DRAINAGE SmucTNES ASSOCIATED WTH A PEIOIAND11' fEDENTON/DETNTION FACILITY SHALL HAVE SOLD LACIOD LIDS. 7. ALL. DRIVEWAY CULVERTS LOCATED WITHIN THE RIGHT-OF-WAY SHALL BE OF SUFFICIENT LENGTH TO PROVIDE A MIR" 11 SLOPE FROM THE LOGE OF THE OIVEM'AY TO THE BOTTOM OF THE DITCH. CLWRTS SNAIL HALE BEYEIED ETA SWPOHS TO MATCH THE SIDE ROPES & ROCK FOR EROSION PROTECTION OF MM LINNETS NO SWALES, WHERE REQUIRED, WM BE OF =110 WARRY ROM PLACED TO A DEPTH OF ONE FOOT AND WST FEi7 TIE FOLLOWREG MX7FTCATION& f-0" ROCIc/40Y,-MX PAS&NG Y-0- ROCKI30-401 PASSMP AND -Y TDC14/10 -M PASSING MSENIATWTK SHALL BE N N)COMAHcT NTH KLS, OR AS NUIIOF'0'D BY 1HE APPwo PLANS Fi1Cv= ASPHALT OR CONCRETE RUBBLE SHALL NOT BE M. A FITS NOT APPROVED FOR INFILTRATION SHALL BE PROVIDED NTH "AGE WT ETS NTU8-OUTBk STUB-MM SAL OOLFaW TO THE MiOWNQ A EACH OUTLET SHALL BE SUITABLY LOCATED AT THE LOKSTT allATION ON TIE LOT SO AS TO SERVICE ALL FUTURE ROOF DOWNSPOUTS AND FOOTING BRANS, DRIVEWAY'S, YAFU L. WS. A'[ My OFVf.R SA ACE OR SU8-.:✓C N.E CRANSNECESSARY TO FEMME O E MOTS S�,IFALILF FOR TIDR INTEHYD UOL EACRR WT,$W SLA(L FOIE FREE-FLOWANG, POSTTE DRAINAGE TO AN APPROVED SIOR MWATER CONVEYANCE SYSICN OR TO AN APPROVED WIFALL LOCATION. B. WILETS ON EACH LOT SHALL BE LOCATED WM A FIW-FODT HILL 2 X 4 STAKE VARIED 'SIGN'. THE STUB -OUT SHALL EXTEND ABOVE SURFACE LEVEL, BE VISIBLE AEG BE SWAU 10 TIC STA*Z C. PIPE MATERIAL SHALL CONFORM TO 1UIDEIDRAIH SPECIFICATIONS L�Ey'?1T N THE KCRS AND, F NON-METALLIC, IE PPE SHALL CONTAIN WE OR OTTER ACCEPTABLE DETECTION. D. DRARIAL£ EASEMENTS ARE REQUIRED FOR DRAINAGE SISIENS DESIGNED TO CONVEY nm T IMUCFL N x"DUAL LOTS. E TIE AtLrW/COHIRACTW IS RESPONSIBLE FOR CdOPDNATI. It LOCATIONS OF ALL STD -OUT CONVEYANCE M W71N RESPECT TO THE URITFS (LE PdYI]L GAY, TELEPHONE, TELEHSICN} F. ALL NLNIXFAL STUD-OU S SHALL BE PRIVATELY OWNED NO MAINTAINED BY THE LOT HOMEOWNER STREET LIGHTING NOTES 1. THE CONTRACTOR SHALL ACO IRE AN ELECTRICAL PFAIIT RM THE CITYS RUM DEPARTMENT. THE ELECTRICAL PERMIT SOUL BE KEPT N THE UPPER BAY OF THE SERVICE CABIET. 2 UPON COMPLETION OF UNDERGROUND INSTALLATION OF POWER FROM POWR VAULT OR POLE TO SERVICE CABNEP. COINUMTOR SHALL NOTIFY THE BUILDING DEPARTMENT. UPON FINAL ELECTRIC& PERMIT APPROVAL, THE ELECIRFCAL INSPECTOR WILL PLACE AN APPROVAL TAG NEXT TO THE WIER BASE SO THAT ELECTRICAL SRMCE CAN BE AUTHORIZED. 3. THE CONTRACTOR SHALL COORONATE POWER SOURCE AID STRVILE LOCATION WITH THE UTILITY COMPANY: 4. TIE CONTRACTOR MULL CONTACT THE UTILITIES UNDERGROUND LOCATION CENTER (1-ODD-424-5555) AT LEAST 3 DAYS EEFULE DIGGING. 5. F11D MAST POE BASS TO RE LEVEL WITH SIDEWALK SURFACE (SE CITY STANDARD DRAWINGS 3-39A AND 343} & LOCATE LIGHT POLES 50 THAT THE POE IS A W KIIA OF SO (6) FEET BOW THE FACE OF CAB, AND THE LUFNAIE MUDS TWO (2) FEET BEYOND THE FACE OF CAB. LIGHT POLES SHALL NOT BE LOCATED WITHIN THE SIDEWALK. POE BASES MAY BE LOCATED WTHWN THE SIDEWALK O LY WIN CRY APPROVAL 7. A RON BOXES MALL BE LOCATED BEHIND THE SDEWALK AND WTHN FINE (5) FEET 1F TIE POLE & COIDUIT MEAL BE SCHEDULE ICI PVC UNDER ALL STREET NO DRIVEWAY CROSSINGS. SLEDUE 40 PVC CONDUIT IS ACCEPTABLE LIM LANDSCAPED AREA& & NMEDIATELY FCIDWHC FINAL NS'EL110N OF THE STREET LIGHT SYSLEIN BY KING COUNTY, ALL STREET UGHT SYSTEM J-00ES MEAL BE SPOT WELDED SHUT USING A I'W1D ON OPPOSITE COPIERS. FEDERAL WAY TOWNHOMES A PORTION OF SW V4 OF SEC. 16, TWP. 21N, ROE. 4E WILLAMETTE MERIDIAN, KING COUNTY, WASHINGTON I I I I I I I I � EXISTING At, PAIOEIIT 70 �,(,T' I _ r�pTGi L__.—_-------"-J + PROPOSED IINIGAIRON &la NEM�YS I.E. 369-60' M 36942' N 11' CONE M. CMP I / Kit STA: 2".75 ATE ---Y —._—.—.—.--- --/ _-----------.__-- STA T24i1I.75 33Y0 I DOSING M PAIOON 10 EOw"YTO — �F�HTIRANT "DAL l IwPT / I IAPP9M RAIP. `W w w w w w , • `JF• fam WILL A5 - su ��s�s E% STORN CB ELEV.=373.20' STORM N.H—PElt AM ELEV..373,61' i M ft 3-4.RIM IE(N) 359.66'. 18•CMP IE j ]68,368.Z954; 36 CMP 'I MILM 3MIO 359.76', 18-CMP E 5] ', 36'CMP AID GRTER AM]:IIRI ` PARIIE71 SIW FM 1Mj 366.64; $6 CUM W.AM& 3 on C" onVA 5-20 R L+U➢ -FAST VEAL '-�' STOP SIDE PER COPY VM ROFIE f NOS 3-03 AID 3--X SIOONWYK % QIB SFCIIOI PFR C07 Dot 3-12 C • I FD.3-4. TO L TCI 4 YS I T FF (GARA f-�377.0 l T I WM IUAN DO EIM t POROUS R RNALT r J7IAtl77 j : am-WAO TD r SEE DEVL� I s,.r•... .,./ �.•ram•. �!•. I V - , •• HiC4'O�TO PENOI>s AY'IW.1' WAIN •i ,37&Aq' ! CUM OWILTNY SECTION .;•i. '•:: .i, t PER COFi DWG. N(. 3-0. Sw PLR LpAI 1 • 3 RACES) I I R AID PRIVAE OWVEjI ON MEET FL t 3►F.00 L------------- e11 aZuJ \ V 'rITIN41004 NS1i1LL CONdEIE SPLASH NACILS I 3 iNlF7S AT ALL DOMMSM LOCATION. `' VFF I CAPA66)4 VZO � 100-MEANT •1 ROUE DOWISPWR 10 DRAM V $ vwmm1 OM POROUS ASPHALT. 1 I > > OIIYE AIS E 40 (TWA J I T PER DETAL NA I 440'L X1224V X Vft I PRIVATE KALE SFffT C& IFL1RATO TRENCH WWI r FELT PPE PER I DEu1L® _ - _ 1OQ-TEAR N Ia LONr caNaElE mLrALx ; PER an DEC, NR 3-M OMERRION ROUIXIBM T1PE 1 02 _ l,l r f.J T 1 U�•CKrI 700 40kcs 1 .f VEIN 7UN DOWN UK P FF ( J74.0 EXPl CURB ER � COHLTEIE Sm 3-4A. (Twd A4a001 � I I C �% ,. , ,! R00-YEAR OE1FM [REIOPOSID PWIUS ASPW WIi }. f -' ' �• RUE 2414 AVE S MM F=xER FM DINAR .f % '<r_' . i '%i PAVBEIR S NO TE MYW ON SEEN CT. - f ; -r< ' � �'. - •. � •�`••!' •: PACIAM AC, �T NY!lICAEIE BNINFR an SECTION m 0" DWG SS 7R68 V WE BY 1' HIGH ASPHALT BOW ~ V CURB & WrITR OIViRAY Sm" o• 1 CHID OCY W.140. ]-& I I I I I I T I I I U A GRAPHIC SCALE w a r r ( Dr Isar ) L L-h - 20 m BENCH MARK SITE BENOFIMW,., NAVO NW THE TCP OF THE BRASS MNNENT AT THE NIFNSEC110N OF SOUTH 333PD STREET AO 24TH AVENUE SOUTH IS 381.70, HMO CI. W RTICN. DATUM: CONVERTED 70 NGVO 29 USING NATIONAL. fE00EPC SURYEY (NOS) VER100N WEEIWE CCRVQt510N IS NA%o U - 3LS5. SITE BENOiNARIC THE TOP OF THE BRASS MONINIFNT AT THE INTERSECTION OF SOUTH 3.TJFO STREET AND 241H AVENUE SOUTH - 37&2Y HAW 29 SITE IMPERVIOUS SURFACE AREAS EXISTING: CM SF DEVELOPER 11,073 SF 7,900 S" POROUS ASPHALT OUANTTES INCLUDE ROOFS, SIDEWNICS, ROAD SURFACES AND DRIVEWAYS LOCATED WTHN THE STE PROPERTY DOUHOA IES. NOTES' I. AC PAIELIENT AND FENCE ASSOCIATED NTH THE E70STNG PRIVATE DRIVE AND LOCATED WITHIN THE STATES RfGHT-OF-WAY FOR INTERSM TE 5 �"-P`f NAY BE 8E3 I 0 "Y TWIN PRTLw APPROVAL OF THE IIASRM4GTCW STATE DEFARTTHEHT Or TRANSPORTANION (MSDO4 NO MM SMALL 0MR NWMN THE H-S RWT-OF-WAY KRHOVi THE APPROVAL OF ISDoT. 2. ALL NOW SHORN ON THIS PLAN OR OTHFFRMSE NECESSARY TO COMPLETE WGVIC WM HOOT (NTTEM7ATE 5) RCNT=OF-WAY SNARL REOEDHE COC OOMRON AAD APPROVAL BY WSODT UNDER SEPARATE PERMIT. OMER OR CONTRACTOR SHALL SECLW ANY NECESSARY WSDOT PERMITS PWOR TO WORK WI M THE INTERSTATE 5 MGHT--OF-WAY. CALL 48 HOURS BEFORE YOU DIG DIAL 811 PERMIT NO. 13— —= EN APPRO DATE 9.3 Declaration of Covenant Covenant will be recorded prior to engineering plan approval. I I I I I I J I J - 42 - 10.0 MAINTENANCE AND OPERATIONS MANUAL The storm drainage facilities for the proposed Federal Way Townhomes project include porous asphalt. Since the proposed storm drainage system is private maintenance will be Ithe responsibility of the owner. IMaintenance checklists will be provided during the formal engineering plan review. J I I I I J 1 1 - 43 - 1 APPENDIX A Stormwater Calculations j I I j j WWHM2012 PROJECT REPORT Project Name: FWTH Bldg A-B Site Name: FW Townhomes Site Address: 2245 S 333rd St City : Federal Way Report Date: 7/15/2013 Gage : Seatac Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 1.00 Version : 2013/06/06 Low Flow Threshold for POC 1 50 Percent of the 2 Year High Flow Threshold for POC 1: 50 year Hourly Time -step PREDEVELOPED LAND USE Name : Basin 1 Bypass: No Groundwater: No Pervious Land Use C, Lawn, Flat .17 Pervious Total 0.17 Impervious Land Use Acres Impervious Total 0 Basin Total 0.17 Element Flows To: Surface Interflow MITIGATED LAND USE Name : Bldg A and B Roofs Bypass: No Groundwater GroundWater: No Pervious Land Use Acres Pervious Total 0 _Impervious Land Use Acres ROOF TOPS FLAT 0.1118 Impervious Total 0.1118 Basin Total 0.1118 Element Flows To: Surface Interflow Gravel Trench Bed 1 Name : Porous Asphalt Bypass: No GroundWater: No Pervious Land Use Acres C, Lawn, Flat .0638 Pervious Total 0.0638 pervious Land Use Acres Impervious Total 0 Basin Total 0.0638 Element Flows To: Surface Gravel Trench Bed 1 Groundwater Interflow Groundwater Gravel Trench Bed 1 Name Gravel Trench Bed 1 Bottom Length: 70.00 ft. Bottom Width: 24.00 ft. Trench bottom slope 1: 0.00001 To 1 Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 0.33 Pour Space of material for first layer: 0.15 Material thickness of second layer: 0.17 Pour Space of material for second layer: 0.35 Material thickness of third layer: 2.1 Pour Space of material for third layer: 0.35 Infiltration On Infiltration rate: 0.44 Infiltration safety factor: 0.5 Discharge Structure Riser Height: 0 ft. Riser Diameter: 0 in. Element Flows To: Outlet 1 Outlet 2 Gravel Trench Bed Hydraulic Table Sta e(ft Area ac Volume(ac-ft) Disoharge(cfs) Infilt(cfs) 0.0000 0.038 0.000 0.000 0.000 0.0289 0.038 0.000 0.000 0.008 0.0578 0.038 0.000 0.000 0.008 0.0867 0.038 0.000 0.000 0.008 0.1156 0.038 0.000 0.000 0.008 0.1444 0.038 0.000 0.000 0.008 0.1733 0.038 0.001 0.000 0.008 0.2022 0.038 0.001 0.000 0.008 0.2311 0.038 0.001 0.000 0.008 0.2600 0.038 0.001 0.000 0.008 0.2889 0.038 0.001 0.000 0.008 0.3178 0.038 0.001 0.000 0.008 0.3467 0.038 0.002 0.000 0.008 0.3756 0.038 0.002 0.000 0.008 0.4044 0.038 0.003 0.000 0.008 0.4333 0.038 0.003 0.000 0.008 0.4622 0.038 0.003 0.000 0.008 0.4911 0.038 0.004 0.000 0.008 0.5200 0.038 0.004 0.000 0.008 0.5489 0.038 0.005 0.000 0.008 0.5778 0.038 0.005 0.000 0.008 0.6067 0.038 0.005 0.000 0.008 0.6356 0.038 0.006 0.000 0.008 0.6644 0.038 0.006 0.000 0.008 0.6933 0.038 0.006 0.000 0.008 0.7222 0.038 0.007 0.000 0.008 0.7511 0.038 0.007 0.000 0.008 0.7800 0.038 0.008 0.000 0.008 0.8089 0.038 0.008 0.000 0.008 0.8378 0.038 0.008 0.000 0.008 0.8667 0.038 0.009 0.000 0.008 0.8956 0.038 0.009 0.000 0.008 0.9244 0.038 0.010 0.000 0.008 0.9533 0.038 0.010 0.000 0.008 0.9822 0.038 0.010 0.000 0.008 1.0111 0.038 0.011 0.000 0.008 1.0400 0.038 0.011 0.000 0.008 1.0689 0.038 0.012 0.000 0.008 1.0978 0.038 0.012 0.000 0.008 1.1267 0.038 0.012 0.000 0.008 1.1556 0.038 0.013 0.000 0.008 1.1844 0.038 0.013 0.000 0.008 1.2133 0.038 0.013 0.000 0.008 1.2422 0.038 0.014 0.000 0.008 1.2711 0.038 0.014 0.000 0.008 1.3000 0.038 0.015 0.000 0.008 1.3289 0.038 0.015 0.000 0.008 1.3578 0.038 0.015 0.000 0.008 1.3867 0.038 0.016 0.000 0.008 1.4156 0.038 0.016 0.000 0.008 1.4444 0.038 0.017 0.000 0.008 1.4733 0.038 0.017 0.000 0.008 1.5022 0.038 0.017 0.000 0.008 1.5311 0.038 0.018 0.000 0.008 1.5600 0.038 0.018 0.000 0.008 1.5889 0.038 0.019 0.000 0.008 1.6178 0.038 0.019 0.000 0.008 1.6467 0.038 0.019 0.000 0.008 1.6756 0.038 0.020 0.000 0.008 1.7044 0.038 0.020 0.000 0.008 1.7333 0.038 0.020 0.000 0.008 1.7622 0.038 0.021 0.000 0.008 1.7911 0.038 0.021 0.000 0.008 1.8200 0.038 0.022 0.000 0.008 1.8489 0.038 0.022 0.000 0.008 1.8778 0.038 0.022 0.000 0.008 1.9067 0.038 0.023 0.000 0.008 1.9356 0.038 0.023 0.000 0.008 1.9644 0.038 0.024 0.000 0.008 1.9933 0.038 0.024 0.000 0.008 2.0222 0.038 0.024 0.000 0.008 2.0511 0.038 0.025 0.000 0.008 2.0800 0.038 0.025 0.000 0.008 2.1089 0.038 0.026 0.000 0.008 U 2.1378 0.038 0.026 0.000 0.008 2.1667 0.038 0.026 0.000 0.008 2.1956 0.038 0.027 0.000 0.008 2.2244 0.038 0.027 0.000 0.008 2.2533 0.038 0.028 0.000 0.008 2.2822 0.038 0.028 0.000 0.008 2.3111 0.038 0.028 0.000 0.008 J 2.3400 0.038 0.029 0.000 0.008 2.3689 0.038 0.029 0.000 0.008 2.3978 0.038 0.029 0.000 0.008 2.4267 0.038 0.030 0.000 0.008 J 2.4556 0.038 0.030 0.000 0.008 2.4844 0.038 0.031 0.000 0.008 2.5133 0.038 0.031 0.000 0.008 2.5422 0.038 0.031 0.000 0.008 JI 1 2.5711 0.038 0.032 0.000 0.008 ANALYSIS RESULTS I j Stream Protection Duration Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.17 Total Impervious Area:O Mitigated Landuse Totals for POC #1 Total Pervious Area:0.0638 Total Impervious Area:0.1118 Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.009253 5 year 0.015318 10 year 0.02005 25 year 0.026829 50 year 0.03246 100 year 0.038589 Flow Frequency Return Periods for Mitigated. Return Period Flow(cfs) 2 year 0.0318 5 year 0.0409 10 year 0.0474 25 year 0.0559 50 year 0.0627 100 year 0.0697 Flow Frequency Return Periods for Mitigated. Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. Year Predeveloped. Mitigated 1949 0.011 0.000 1950 0.028 0.000 1951 0.014 0.000 1952 0.006 0.000 1953 0.005 0.000 1954 0.008 0.000 1955 0.011 0.000 1956 0.011 0.000 1957 0.012 0.000 1958 0.007 0.000 1959 0.006 0.000 1960 0.013 0.000 POC #1 POC #1 POC #1 1961 0.007 0.000 1962 0.004 0.000 } 1963 0.007 0.000 1964 0.008 0.000 1965 0.006 0.000 1966 0.007 0.000 1967 0.013 0.000 1968 0.009 0.000 1969 0.007 0.000 1970 0.007 0.000 1971 0.008 0.000 1972 0.017 0.000 1973 0.006 0.000 1974 0.008 0.000 j 1975 0.014 0.000 1976 0.008 0.000 1977 0.003 0.000 1978 0.009 0.000 1979 0.004 0.000 1980 0.011 0.000 1981 0.010 0.000 1982 0.020 0.000 1983 0.008 0.000 1 1984 0.008 0.000 f 1985 0.004 0.000 1986 0.015 0.000 1987 0.013 0.000 1988 0.005 0.000 1989 0.004 0.000 1990 0.029 0.000 1991 0.024 0.000 1992 0.007 0.000 - 1993 0.006 0.000 1994 0.003 0.000 1995 0.008 0.000 1996 0.018 0.000 1997 0.013 0.000 1998 0.009 0.000 1999 0.020 0.000 i 2000 0.010 0.000 2001 0.002 0.000 2002 0.012 0.000 2003 0.010 0.000 2004 0.027 0.000 2005 0.009 0.000 i 2006 0.010 0.000 2007 0.040 0.000 2008 0.024 0.000 2009 0.013 0.000 Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0403 0.0000 2 0.0292 0.0000 j3 0.0279 0.0000 4 0.0267 0.0000 5 0.0240 0.0000 6 0.0240 0.0000 7 0.0204 0.0000 8 0.0203 0.0000 9 0.0181 0.0000 10 0.0175 0.0000 11 0.0147 0.0000 12 0.0144 0.0000 13 0.0143 0.0000 14 0.0134 0.0000 15 0.0134 0.0000 16 0.0130 0.0000 17 0.0129 0.0000 18 0.0128 0.0000 19 0.0122 0.0000 20 0.0118 0.0000 21 0.0113 0.0000 22 0.0110 0.0000 23 0.0108 0.0000 24 0.0106 0.0000 25 0.0103 0.0000 26 0.0102 0.0000 27 0.0099 0.0000 28 0.0096 0.0000 29 0.0092 0.0000 30 0.0088 0.0000 31 0.0087 0.0000 32 0.0086 0.0000 33 0.0084 0.0000 34 0.0082 0.0000 35 0.0081 0.0000 36 0.0080 0.0000 37 0.0080 0.0000 38 0.0080 0.0000 39 0.0076 0.0000 40 0.0076 0.0000 41 0.0075 0.0000 42 0.0075 0.0000 43 0.0,074 0.0000 44 0.0073 0.0000 45 0.0072 0.0000 46 0.0072 0.0000 47 0.0070 0.0000 48 0.0064 0.0000 49 0.0061 0.0000 50 0.0061 0.0000 51 0.0057 0.0000 52 0.0057 0.0000 53 0.0051 0.0000 54 0.0046 0.0000 55 0.0042 0.0000 56 0.0042 0.0000 57 0.0038 0.0000 58 0.0036 0.0000 59 0.0030 0.0000 60 0.0027 0.0000 61 0.0025 Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(c£s) Predev Mit Percentage Pass/Fail 0.0046 2421 0 0 Pass 0.0049 2091 0 0 Pass 0.0052 1814 0 0 Pass 0.0055 1555 0 0 Pass 0.0058 1360 0 0 Pass 0.0060 1192 0 0 Pass 0.0063 1038 0 0 Pass 0.0066 910 0 0 Pass 0.0069 801 0 0 Pass 0.0072 698 0 0 Pass 0.0074 616 0 0 Pass 0.0077 548 0 0 Pass 0.0080 491 0 0 Pass 0.0083 432 0 0 Pass 0.0086 393 0 0 Pass 0.0088 348 0 0 Pass 0.0091 318 0 0 Pass 0.0094 290 0 0 Pass 0.0097 254 0 0 Pass 0.0100 224 0 0 Pass 0.0102 200 0 0 Pass 0.0105 173 0 0 Pass 0.0108 154 0 0 Pass 0.0111 133 0 0 Pass 0.0114 120 0 0 Pass 0.0117 109 0 0 Pass 0.0119 99 0 0 Pass 0.0122 88 0 0 Pass 0.0125 80 0 0 Pass 0.0128 72 0 0 Pass 0.0131 65 0 0 Pass 0.0133 58 0 0 Pass 0.0136 54 0 0 Pass 0.0139 53 0 0 Pass 0.0142 48 0 0 Pass 0.0145 42 0 0 Pass 0.0147 41 0 0 Pass. 0.0150 40 0 0 Pass 0.0153 38 0 0 Pass 0.0156 37 0 0 Pass 0.0159 36 0 0 Pass 0.0162 33 0 0 Pass 0.0164 33 0 0 Pass 0.0167 31 0 0 Pass 0.0170 30 0 0 Pass 0.0173 30 0 0 Pass 0.0176 28 0 0 Pass I I 0.0178 26 0 0 Pass 0.0181 24 0 0 Pass -`� 0.0184 22 0 0 Pass 0.0187 21 0 0 Pass 0.0190 20 0 0 Pass 0.0192 20 0 0 Pass 0.0195 20 0 0 Pass 0.0198 19 0 0 Pass 0.0201 18 0 0 Pass 0.0204 17 0 0 Pass 0.0207 14 0 0 Pass 0.0209 13 0 0 Pass 0,0212 13 0 0 Pass 0.0215 13 0 0 Pass 0.0218 13 0 0 Pass 0.0221 12 0 0 Pass 0.0223 12 0 0 Pass 0.0226 12 0 0 Pass JI 0.0229 11 0 0 Pass 0.0232 10 0 0 Pass 0.0235 10 0 0 Pass 0.0237 9 0 0 Pass 0.0240 8 0 0 Pass 0.0243 7 0 0 Pass 0.0246 7 0 0 Pass 0.0249 7 0 0 Pass 0.0252 7 0 0 Pass 0.0254 7 0 0 Pass 0.0257 6 0 0 Pass 0,0260 6 0 0 Pass 0.0263 6 0 0 Pass 0.0266 5 0 0 Pass J J 0.0268 3 0 0 Pass 0.0271 3 0 0 Pass 0.0274 3 0 0 Pass J 0.0277 3 0 0 Pass 0.0280 2 0 0 Pass 0.0282 2 0 0 Pass 0.0285 2 0 0 Pass J 0.0288 2 0 0 Pass 0.0291 2 0 0 Pass J 0.0294 0.0296 1 1 0 0 0 0 Pass Pass 0.0299 1 0 0 Pass 0.0302 1 0 0 Pass 0.0305 1 0 0 Pass J 0.0308 1 0 0- Pass 0.0311 1 0 0 Pass 0.0313 1 0 0 Pass J 0.0316 1 0 0 Pass 0.0319 1 0 0 Pass 0.0322 1 0 0 Pass J0.0325 1 0 0 Pass j J l 1 Water Quality HMP Flow and Volume for POC #1 On-line facility volume: 0 acre-feet On-line facility target flow: 0 cfs. 'r Adjusted for 15 min: 0 efs. off-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs. Perind and Impind Changes 1 No changes have been made. This program and accompanying documentation are provided 'as -is' without warranty of any kind. The ` entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages'. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2013; All Rights Reserved. I I I I'J WWHM2012 PROJECT REPORT Project Name: FWTH Bldg C Site Name: FW Townhomes Site Address: 2245 S 333rd St City : Federal Way Report Date: 7/15/2013 Gage : Seatac Data Start : 1948/10/01 00:00 Data End : 2009/09/30 00:00 Precip Scale: 1.00 Version : 2013/06/06 Low Flow Threshold for POC � 50 Percent of the 2 Year High Flow Threshold for POC 1: 50 year Hourly Time -step PREDEVELOPED LAND USE Name : Basin Bldg C Bypass: No Groundwater: No Pervious Land Use Acres C, Lawn, Flat .055 Pervious Total 0.055 Impervious Land Use Acres Impervious Total 0 Basin Total 0.055 Element Flows To: Surface Interflow MITIGATED LAND USE Name : Gravel Trench Bed 1 Bottom Length: 32.00 ft. Bottom Width: 20.00 ft. Groundwater I Trench bottom slope 1: 0.00001. To ]. Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 0.33 r Pour Space of material for first layer: 0.15 Material thickness of second layer: 0.17 Pour Space of material for second layer: 0.35 Material thickness of third layer: 2.5 Pour Space of material for third layer: 0.35 Infiltration On Infiltration rate: 0.44 Infiltration safety factor: 0.25 Discharge Structure Riser Height: 0 ft. Riser Diameter: 0 in. 1� Element Flows To: Outlet 1 Outlet 2 Stage(£t)_ Gravel Trench Bed Hydraulic Area(ac) Volume(ac-ft) Discharge(cfs) Table Infilt(cfs) 0.0000� 0.014 0.000 0.000 0.000 0.0333 0.014 0.000 0.000 0.001 0.0667 0.014 0.000 0.000 0.001 0.1000 0.014 0.000 0.000 0.001 0.1333 0.014 0.000 0.000 0.001 0.1667 0.014 0.000 0.000 0.001 0.2000 0.014 0.000 0.000 0.001 0.2333 0.014 0.000 0.000 0.001 0.2667 0.014 0.000 0.000 0.001 0.3000 0.014 0.000 0.000 0.001 0.3333 0.014 0.000 0.000 0.001 0.3667 0.014 0.001 0.000 0.001 0.4000 0.014 0.001 0.000 0.001 0.4333 0.014 0.001 0.000 0.001 0.4667 0.014 0.001 0.000 0.001 0.5000 0.014 0.001 0.000 0.001 0.5333 0.014 0.001 0.000 0.001 0.5667 0.014 0.002 0.000 0.001 0.6000 0.014 0.002 0.000 0.001 0.6333 0.014 0.002 0.000 0.001 0.6667 0.014 0.002 0.000 0.001 0.7000 0.014 0.002 0.000 0.001 0.7333 0.014 0.002 0.000 0.001 0.7667 0.014 0.003 0.000 0.001 0.8000 0.014 0.003 0.000 0.001 0.8333 0.014 0.003 0.000 0.001 0.8667 0.014 0.003 0.000 0.001 0.9000 0.014 0.003 0.000 0.001 0.9333 0.014 0.003 0.000 0.001 0.9667 0.014 0.004 0.000 0.001 1.0000 0.014 0.004 0.000 0.001 1.0333 0.014 0.004 0.000 0.001 1.0667 0.014 0.004 0.000 0.001 1.1000 0.014 0.004 0.000 0.001 1.1333 0.014 0.004 0.000 0.001 1.1667 0.014 0.005 0.000 0.001 1.2000 0.014 0.005 0.000 0.001 1.2333 0.014 0.005 0.000 0.001 1.2667 0.014 0.005 0.000 0.001 1.3000 0.014 0.005 0.000 0.001 1.3333 0.014 0.006 0.000 0.001 1.3667 0.014 0.006 0.000 0.001 1.4000 0.014 0.006 0.000 0.001 1.4333 0.014 0.006 0.000 0.001 1.4667 0.014 0.006 0.000 0.001 1.5000 0.014 0.006 0.000 0.001 1.5333 0.014 0.007 0.000 0.001 1.5667 0.014 0.007 0.000 0.001 1.6000 0.014 0.007 0.000 0.001 1.6333 0.014 0.007 0.000 0.001 1.6667 0.014 0.007 0.000 0.001 1.7000 0.014 0.007 0.000 0.001 1.7333 0.014 0.008 0.000 0.001 1.7667 0.014 0.008 0.000 0.001 1.8000 0.014 0.008 0.000 0.001 1.8333 0.014 0.008 0.000 0.001 1.8667 0.014 0.008 0.000 0.001 1.9000 0.014 0.008 0.000 0.001 1.9333 0.014 0.009 0.000 0.001 1.9667 0.014 0.009 0.000 0.001 2.0000 0.014 0.009 0.000 0.001 2.0333 0.014 0.009 0.000 0.001 2.0667 0.014 0.009 0.000 0.001 2.1000 0.014 0.009 0.000 0.001 2.1333 0.014 0.010 0.000 0.001 2.1667 0.014 0.010 0.000 0.001 2.2000 0.014 0.010 0.000 0.001 2.2333 0.014 0.010 0.000 0.001 2.2667 0.014 0.010 0.000 0.001 2.3000 0.014 0.010 0.000 0.001 2.3333 0.014 0.011 0.000 0.001 2.3667 0.014 0.011 0.000 0.001 2.4000 0.014 0.011 0.000 0.001 2.4333 0.014 0.011 0.000 0.001 2.4667 0.014 0.011 0.000 0.001 2.5000 0.014 0.012 0.000 0.001 2.5333 0.014 0.012 0.000 0.001 2.5667 0.014 0.012 0.000 0.001 2.6000 0.014 0.012 0.000 0.001 2.6333 0.014 0.012 0.000 0.001 2.6667 0.014 0.012 0.000 0.001 2.7000 0.014 0.013 0.000 0.001 2.7333 0.014 0.013 0.000 0.001 2.7667 0.014 0.013 0.000 0.001 2.8000 0.014 0.013 0.000 0.001 2.8333 0.014 0.013 0.000 0.001 2.8667 0.014 0.013 0.000 0.001 2.9000 0.014 0.014 0.000 0.001 2.9333 0.014 0.014 0.000 0.001 2.9667 0.014 0.014 0.000 3.0000 0.014 0.014 0.000 Name Bldg C Roof Bypass: No Groundwater: No Pervious Land Use Acres Pervious Total 0 Impervious Land Use Acres ROOF TOPS FLAT 0.0328 Impervious Total 0.0328 Basin Total 0.0328 Element Flows To: Surface Interf low Gravel Trench Bed 1 Name : Porous Asphalt Bypass: No Groundwater: No Pervious Land Use C, Lawn, Flat Pervious Total Impervious Land Use Impervious Total Basin Total Acres .022 0.022 Acres 0 0.022 0.001 0.001 Groundwater Element Flows To: Surface Interflow Groundwater Gravel Trench Bed 1 Gravel Trench Bed 1 Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.055 Total Impervious Area:O Mitigated Landuse Totals for POC #1 Total Pervious Area:0.022 Total Impervious Area:0.0328 Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.002994 5 year 0.004956 10 year 0.006487 25 year 0.00868 50 year 0.010502 100 year 0.012485 Flow Frequency Return Periods for Un-Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.0095 j 5 year 0.0123 yf 10 year 0.0142 25 year 0.0169 50 year 0.0189 J 100 year 0.0211 Flow Frequency Return Periods for Mitigated. POC #1 J Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.003 0.000 1950 0.009 0.000 1951 0.005 0.000 1952 0.002 0.000 1953 0.001 0.000 1954 0.003 0.000 1955 0.004 0.000 -� 1956 0.004 0.000 1957 0.004 0.000 1958 0.002 0.000 1959 0.002 0.000 1960 0.004 0.000 1961 0.002 0.000 1962 0.001 0.000 1963 0.002 0.000 1964 0.003 0.000 1965 0.002 0.000 1966 0.002 0.000 1967 0.004 0.000 1968 0.003 0.000 1969 0.002 0.000 1970 0.002 0.000 1971 0.003 0.000 1972 0.006 0.000 1973 0.002 0.000 1974 0.003 0.000 1975 0.005 0.000 1976 0.003 0.000 1977 0.001 0.000 1978 0.003 0.000 1979 0.001 0.000 1980 0.004 0.000 1981 0.003 0.000 1982 0.007 0.000 1983 0.003 0.000 1984 0.002 0.000 1985 0.001 0.000 1986 0.005 0.000 1987 0.004 0.000 1988 0.002 0.000 1989 0.001 0.000 J 1990 0.009 0.000 1991 0.008 0.000 1992 0.002 0.000 1993 1994 0.002 0.001 0.000 0.000 1995 0.002 0.000 1996 0.006 0.000 l 1997 0.004 0.000 J 1998 0.003 0.000 1999 0.007 0.000 J 2000 2001 0.003 0.001 0.000 0.000 2002 0.004 0.000 2003 0.003 0.000 2004 0.009 0`.000 J 2005 0.003 0.000 2006 0.003 0.000 2007 0.013 0.000 J 2008 0.008 0.000 2009 0.004 0.000 �1 Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated J1 0.0130 0.0000 j 7 2 0.0095 0.0000 3 0.0090 0.0000 4 0.0086 0.0000 5 0.0078 0.0000 6 0.0078 0.0000 7 0.0066 0.0000 8 0.0066 0.0000 9 0.0059 0.0000 10 0.0057 0.0000 11 0.0048 0.0000 12 0.0047 0.0000 13 0.0046 0.0000 14 0.0043 0.0000 15 0.0043 0.0000 16 0.0042 0.0000 17 0.0042 0.0000 18 0.0041 0.0000 19 0.0040 0.0000 20 0.0038 0.0000 21 0.0036 0.0000 22 0.0036 0.0000 23 0.0035 0.0000 24 0.0034 0.0000 25 0.0033 0.0000 26 0.0033 0.0000 27 0.0032 0.0000 28 0.0031 0.0000 29 0.0030 0.0000 30 0.0029 0.0000 31 0.0028 0.0000 32 0.0028 0.0000 33 0.0027 0.0000 34 0.0027 0.0000 35 0.0026 0.0000 36 0.0026 0.0000 37 0.0026 0.0000 38 0.0026 0.0000 39 0.0024 0.0000 40 0.0024 0.0000 41 0.0024 0.0000 42 0.0024 0.0000 43 0.0024 0.0000 44 0.0023 0.0000 45 0.0023 0.0000 46 0.0023 0.0000 47 0.0023 0.0000 48 0.0021 0.0000 49 0.0020 0.0000 50 0.0020 0.0000 51 0.0018 0.0000 52 0.0018 0.0000 53 0.0017 0.0000 54 0.0015 0.0000 55 0.0014 0.0000 56 0.0014 0.0000 57 0.0012 0.0000 58 0.0012 0.0000 0 0.0056 30 0 0 Pass 0.0057 28 0 0 Pass 0.0058 26 0 0 Pass 0.0059 24 0 0 Pass 0.0060 22 0 0 Pass 0.0060 21 0 0 Pass 0.0061 20 0 0 Pass 0.0062 20 0 0 Pass 0.0063 20 0 0 Pass 0.0064 19 0 0 Pass 0.0065 18 0 0 Pass 0.0066 17 0 0 Pass 0.0067 14 0 0 Pass 0.0068 13 0 0 Pass 0.0069 13 0 0 Pass 0.0070 13 0 0 Pass 0.0070 13 0 0 Pass 0.0071 12 0 0 Pass 0.0072 12 0 0 Pass 0.0073 12 0 0 Pass 0.0074 11 0 0 Pass 0.0075 10 0 0 Pass 0.0076 10 0 0 Pass 0.0077 9 0 0 Pass 0.0078 8 0 0 Pass 0.0079 7 0 0 Pass 0.0080 7 0 0 Pass 0.0080 7 0 0 Pass 0.0081 7 0 0 Pass 0.0082 7 0 0 Pass 0.0083 6 0 0 Pass 0.0084 6 0 0 Pass 0.0085 6 0 0 Pass 0.0086 5 0 0 Pass 0.0087 3 0 0 Pass 0.0088 3 0 0 Pass 0.0089 3 0 0 Pass 0.0090 3 0 0 Pass 0.0090 2 0 0 Pass 0.0091 2 0 0 Pass 0.0092 2 0 0 Pass -0.0093 2 0 0 Pass 0.0094 2 0 0 Pass 0.0095 1 0 0 Pass 0.0096 1 0 0 Pass 0.0097 1 0 0 Pass 0.0098 1 0 0 Pass 0.0099 1 0 0 Pass 0.0100 1 0 0 Pass 0.0100 1 0 0 Pass 0.0101 1 0 0 Pass 0.0102 1 0 0 Pass 0.0103 1 0 0 Pass 0.0104 1 0 0 Pass 0.0105 1 0 0 Pass Water Quality HMP Flow and Volume for POC fl On-line facility volume: 0 acre-feet On-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs, off-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs. Perind and Impind Changes No changes have been made. This program and accompanying documentation are provided 'as -is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2013; All Rights Reserved. M WWHM2 012 PROJECT REPORT Project Name: FWTH PriRoad Site Name: FW Townhomes Site Address: 2245 S 333rd St City : Federal Way Report Date: 7/15/2013 Gage : Seatac Data Start : 1948/10/01 00:00 Data End : 2009/09/30 00:00 Precip Scale: 1.00 Version : 2013/06/06 Low Flow Threshold for POC 1 : 50 Percent of the 2 Year High Flow Threshold for POC 1: 50 year Hourly Time -step PREDEVELOPED LAND USE Name : Basin 1 Bypass: No Groundwater: No Pervious Land Use Acres C, Lawn, Flat .1508 Pervious Total 0.1508 Impervious Land Use Acres Impervious Total 0 Basin Total 0.1508 Element Flows To: Surface MITIGATED LAND USE Name : Basin 1 Bypass: No Interflow Groundwater GroundWater: No Pervious Land Use Acres Pervious Total 0 Impervious Land Use Acres ROADS FLAT 0.0174 SIDEWALKS FLAT 0.0302 Impervious Total 0.0476 Basin Total 0.0476 Element Flows To: Surface Interflow Gravel Trench Bed 1 Name - : Gravel Trench Bed 1 Bottom Length: 224.75 ft. Bottom Width: 20.00 ft. Trench bottom slope 1: 0.01 To 1 Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 0.33 Pour Space of material for first layer: 0.15 Material thickness of second layer: 0.17 Pour Space of material for second layer: 0.35 Material thickness of third layer: 0.67 Pour Space of material for third layer: 0.35 Infiltration On Infiltration rate: 0.44 Infiltration safety factor: 0.5 Dischar a Structure Riser Height: 0 ft. Riser Diameter: 0 in. Element Flows To: Outlet 1 Outlet 2 Groundwater Gravel Trench Bed Hydraulic Table stage(ft) Area(ac) volume(as-ft) Discharge(cfs) Infilt(efs) 0.0000 0.103 0.000 0.000 0.000 0.0130 0.103 0.000 0.000 0.022 0.0260 0.103 0.000 0.000 0.022 0.0390 0.103 0.000 0.000 0.022 0.0520 0.103 0.000 0.000 0.022 0.0650 0.103 0.001 0.000 0.022 0.0780 0.1.03 0.001 0.000 0.022 0.0910 0.103 0.001 0.000 0.022 0.1040 0.103 0.001 0.000 0.022 0.1170 0.103 0.001 0.000 0.022 0.1300 0.103 0.002 0.000 0.022 0.1430 0.103 0.002 0.000 0.022 0.1560 0.103 0.002 0.000 0.022 0.1690 0.103 0.002 0.000 0.022 0.1820 0.103 0.002 0.000 0.022 0.1950 0.103 0.003 0.000 0.022 0.2080 0.103 0.003 0.000 0.022 0.2210 0.103 0.003 0.000 0.022 0.2340 0.103 0.003 0.000 0.022 0.2470 0.103 0.003 0.000 0.022 0.2600 0.103 0.004 0.000 0.022 0.2730 0.103 0.004 0.000 0.022 0.2860 0.103 0.004 0.000 0.022 0.2990 0.103 0.004 0.000 0.022 0.31.20 0.103 0.004 0.000 0.022 0.3250 0.103 0.005 0.000 0.022 0.3380 0.103 0.005 0.000 0.022 0.3510 0.103 0.006 0.000 0.022 0.3640 0.103 0.006 0.000 0.022 0.3770 0.103 0.006 0.000 0.022 0.3900 0.103 0.007 0.000 0.022 0.4030 0.103 0.007 0.000 0.022 0.4160 0.103 0.008 0.000 0.022 0.4290 0.103 0.008 0.000 0.022 0.4420 0.103 0.009 0.000 0.022 0.4550 0.103 0.009 0.000 0.022 0.4680 0.103 0.010 0.000 0.022 0.4810 0.103 0.010 0.000 0.022 0.4940 0.103 0.011 0.000 0.022 0.5070 0.103 0.011 0.000 0.022 0.5200 0.103 0.012 0.000 0.022 0.5330 0.103 0.012 0.000 0.022 0.5460 0.103 0.013 0.000 0.022 0.5590 0.103 0.013 0.000 0.022 0.5720 0.103 0.014 0.000 0.022 0.5850 0.103 0.014 0.000 0.022 0.5980 0.103 0.014 0.000 0.022 0.6110 0.103 0.015 0.000 0.022 0.6240 0.103 0.015 0.000 0.022 0.6370 0.103 0.016 0.000 0.022 0.6500 0.103 0.016 0.000 0.022 0.6630 0.103 0.017 0.000 0.022 0.6760 0.103 0.017 0.000 0.022 0.6890 0.103 0.018 0.000 0.022 0.7020 0.103 0.018 0.000 0.022 0.7150 0.103 0.019 0.000 0.022 0.7280 0.103 0.019 0.000 0.022 0.7410 0.103 0.020 0.000 0.022 0.7540 0.103 0.020 0.000 0.022 0.7670 0.103 0.021 0.000 0.022 0.7800 0.103 0.021 0.000 0.022 0.7930 0.103 0.021 0.000 0.022 0.8060 0.103 0.022 0.000 0.022 11 y ri 0.8190 0.103 0.022 0.000 0.022 0.8320 0.103 0.023 0.000 0.022 0.8450 0.103 0.023 0.000 0.022 0.8580 0.103 0.024 0.000 0.022 0.8710 0.103 0.024 0.000 0.022 0.8840 0.103 0.025 0.000 0.022 1 0.8970 0.103 0.025 0.000 0.022 0.9100 0.103 0.026 0.000 0.022 0.9230 0.103 0.026 0.000 0.022 0.9360 0.103 0.027 0.000 0.022 0.9490 0.103 0.027 0.000 0.022 0.9620 0.103 0.028 0.000 0.022 0.9750 0.103 0.028 0.000 0.022 0.9880 0.103 0.029 0.000 0.022 1.0010 0.103 0.029 0.000 0.022 1.0140 0.103 0.029 0.000 0.022 1.0270 0.103 0.030 0.000 0.022 1.0400 0.103 0.030 0.000 0.022 1.0530 0.103 0.031 0.000 0.022 1.0660 0.103 0.031 0.000 0.022 1.0790 0.103 0.032 0.000 0.022 1.0920 0.103 0.032 0.000 0.022 1.1050 0.103 0.033 0.000 0.022 1.1180 0.103 0.033 0.000 0.022 1.1310 0.103 0.034 0.000 0.022 1.1440 0.103 0.034 0.000 0.022 1.1570 0.103 0.035 0.000 0.022 1.1700 0.103 0.035 0.000 0.022 Name Porous Asphalt Bypass: No Groundwater: No Pervious Land Use Acres C, Lawn, Flat .1032 Pervious Total 0.1032 Impervious Land Use Acres Impervious Total 0 Basin Total 0.1032 Element Flows To: Surface Interflow Groundwater Gravel Trench Bed 1 Gravel Trench Bed 1 ANALYSIS RESULTS Stream Protection Duration Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.1508 Total Impervious Area:O Mitigated Landuse Totals for POC #1 Total Pervious Area:0.1032 Total Impervious Area:0.0476 Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.008208 5 year 0.0135,88 10 year 0.017785 25 year 0.023799 50 year 0.028794 100 year 0.03423 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.009 0.000 1950 0.025 0.000 1951 0.013 0.000 1952 0.006 0.000 1953 0.004 0.000 1954 0.007 0.000 1955 0.010 0.000 1956 0.010 0.000 1957 0.010 0.000 1958 0.007 0.000 1959 0.005 0.000 1960 0.011 0.000 1961 0.006 0.000 1962 0.004 0.000 1963 0.007 0.000 1964 0.007 0.000 1965 0.005 0.000 1966 0.006 0.000 1967 0.012 0.000 1968 0.008 0.000 1969 0.006 0.000 1970 0.007 0.000 1971 0.007 0.000 1972 0.015 0.000 1973 0.005 0.000 1974 0.007 0.000 1975 0.013 0.000 • 1976 0.007 0.000 1977 0.003 0.000 1978 0.008 0.000 1979 0.003 0.000 1980 0.010 0,000 1981 0.009 0.000 1982 0.018 0.000 1983 0.007 0.000 1984 0.007 0.000 1985 0.004 0.000 1986 0.013 0.000 1987 0.012 0.000 1988 0.005 0.000 1989 0.003 0.000 1990 0.026 0.000 1991 0.021 0.000 1992 0.006 0.000 1993 0.005 0.000 1994 0.002 0.000 1995 0.007 0.000 1996 0.016 0.000 1997 0.012 0,000 1998 0.008 0.000 1999 0.018 0.000 2000 0.009 0.000 2001 0.002 0.000 2002 0.011 0.000 2003 0.009 0.000 2004 0.024 0.000 2005 0.008 0.000 2006 0.009 0.000 2007 0.036 0.000 2008 0.021 0.000 2009 0.011 0.000 Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 •� Rank Predeveloped Mitigated 1 0.0358 0.0000 2 0.0259 0.0000 3 0.0247 0.0000 4 0.0237 0.0000 5 0.0213 0.0000 6 0.0213 0.0000 J 7 0.0181 0.0000 8 0.0180 0.0000 9 0.0160 0.0000 10 0.0155 0.0000 Ij 11 0.0130 0.0000 12 0.0128 0.0000 13 0.0127 0.0000 14 0.0119 0.0000 15 0.0119 0.0000 16 0.0115 0.0000 17 0.0115 0.0000 18 0.0113 0.0000 19 0.0109 0.0000 20 0.0105 0.0000 21 0.0100 0.0000 22 0.0097 0.0000 23 0.0096 0.0000 24 0.0094 0.0000 25 0.0091 0.0000 26 0.0090 0.0000 27 0.0087 0.0000 28 0.0085 0.0000 29 0.0082 0.0000 30 0.0078 0.0000 31 0.0078 0.0000 32 0.0076 0.0000 33 0.0075 0.0000 34 0.0073 0.0000 35 0.0071 0.0000 36 0.0071 0.0000 37 0.0071 0.0000 38 0.0071 0.0000 39 0.0067 0.0000 40 0.0067 0.0000 41 0.0067 0.0000 42 0.0066 0.0000 43 0.0066 0.0000 44 0.0064 0.0000 45 0.0064 0.0000 46 0.0064 0.0000 47 0.0062 0.0000 48 0.0057 0.0000 49 0.0055 0.0000 50 0.0054 0.0000 51 0.0051 0.0000 52 0.0051 0.0000 53 0.0046 0.0000 54 0.0041 0.0000 55 0.0038 0.0000 56 0.0037 0.0000 57 0.0034 0.0000 58 0.0032 0.0000 59 0.0027 0.0000 60 0.0024 0.0000 61 0.0022 0.0000 Stream Protection Duration POC #1 The Facility PASSED I I j I j j j The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0041 2420 0 0 Pass 0.0044 2091 0 0 Pass 0.0046 1814 0 0 Pass 0.0049 1554 0 0 Pass 0.0051 1360 0 0 Pass 0.0054 1193 0 0 Pass 0.0056 1038 0 0 Pass 0.0058 910 0 0 Pass 0.0061 801 0 0 Pass 0.0063 698 0 0 Pass 0.0066 616 0 0 Pass 0.0068 548 0 0 Pass 0.0071 492 0 0 Pass 0.0073 432 0 0 Pass 0.0076 393 0 0 Pass 0.0078 348 0 0 Pass 0.0081 318 0 0 Pass 0.0083 290 0 0 Pass 0.0086 254 0 0 Pass 0.0088 224 0 0 Pass 0.0091 199 0 0 Pass 0.0093 173 0 0 Pass 0.0096 154 0 0 Pass 0.0098 133 0 0 Pass 0.0101 120 0 0 Pass 0.0103 109 0 0 Pass 0.0106 99 0 0 Pass 0.0108 88 0 0 Pass 0.0111 80 0 0 Pass 0.0113 71 0 0 Pass 0.0116 65 0 0 Pass 0.0118 58 0 0 Pass 0.0121 54 0 0 Pass 0.0123 53 0 0 Pass 0.0126 48 0 0 Pass 0.0128 42 0 0 Pass 0.0131 41 0 0 Pass 0.0133 40 0 0 Pass 0.0136 38 0 0 Pass 0.0138 37 0 0 Pass 0.0141 36 0 0 Pass 0.0143 33 0 0 Pass 0.0146 33 0 0 Pass 0.0148 31 0 0 Pass 0.0151 30 0 0 Pass 0.0153 30 0 0 Pass 0.0156 28 0 0 Pass 0.0158 26 0 0 Pass 0.0161 24 0 0 Pass 0.0163 22 0 0 Pass 0.0166 21 0 0 Pass 0.0168 20 0 0 Pass 0.0171 20 0 0 Pass 0.0173 20 0 0 Pass j _1 0.0176 19 0 0 Pass 0.0178 18 0 0 Pass 0.0181 17 0 0 Pass 0.0183 14 0 0 Pass 0.0186 13 0 0 Pass 0.0188 13 0 0 Pass 0.0191 13 0 0 Pass 0.0193 13 0 0 Pass 0.0196 12 0 0 Pass -� 0.0198 12 0 0 Pass 0.0201 12 0 0 Pass 0.0203 11 0 0 Pass 0.0206 10 0 0 Pass 0.0208 10 0 0 Pass 0.0211 9 0 0 Pass 0.0213 8 0 0 Pass 0.0216 7 0 0 Pass 0.0218 7 0 0 Pass 0.0221 7 0 0 Pass 0.0223 7 0 0 Pass 1 0.0226 7 0 0 Pass J 0.0228 6 0 0 Pass 0.0231 6 0 0 Pass l 0.0233 6 0 0 Pass I 0.0236 5 0 0 Pass 0.0238 3 0 0 Pass 0.0241 3 0 0 Pass 0.0243 3 0 0 Pass 0.0246 3 0 0 Pass 0.0248 2 0 0 Pass 0.0251 2 0 0 Pass 0.0253 2 0 0 Pass 1 0.0256 2 0 0 Pass 0.0258 2 0 0 Pass 0.0261 1 0 0 Pass 0.0263 1 0 0 Pass 0.0265 1 0 0 Pass 0.0268 1 0 0 Pass 0.0270 1 0 0 Pass -1 0.0273 1 0 0 Pass 0.0275 1 0 0 Pass 0.0278 1 0 0 Pass 0.0280 1 0 0 Pass 0.0283 1 0 0 Pass 0.0285 1 0 0 Pass 0.0288 1 0 0 Pass Water Quality BMP Flow and volume for POC ski On-line facility volume: 0 acre-feet On-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs. Off-line facility target flow: 0 cfs. -� Adjusted for 15 min: 0 cfs. Perl.nd and Impind Changes No changes have been made. This program and accompanying documentation are provided 'as -is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright m by : Clear Creek Solutions, Inc. 2005-2013; All Rights Reserved. j WWHM2012 PROJECT REPORT Project Name: FWTH Rec Sp N Site Name: FW Townhomes Site Address: 2245 S 333rd St City : Federal Way Report Date: 7/15/2013 Gage : Seatac Data Start : 1948/10/01 00:00 Data End : 2009/09/30 00:00 Precip Scale: 1.00 Version : 2013/06/06 Low Flow Threshold for POC 1 : 50 Percent of the 2 Year High Flow Threshold for POC 1: 50 year Hourly Time -Step PREDEVELOPED LAND USE Name : Rec Space N Basin Bypass: No Groundwater: No Pervious Land Use Acres C, Lawn, Flat .0674 Pervious Total 0.0674 Impervious Land Use Acres Impervious Total 0 Basin Total 0.0674 Element Flows To: Surface Interflow MITIGATED LAND USE Name : Gravel Trench Bed 1 Bottom Length: 60.00 ft. Bottom Width: 10.00 ft. Groundwater Trench bottom slope 1: 0.00001 To 1 Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 1.75 Pour Space of material for first layer: 0.35 Material thickness of second layer: 0 Pour Space of material for second layer: 0 Material thickness of third layer: 0 Pour Space of material for third layer: 0 Infiltration On Infiltration rate: 0.44 Infiltration safety factor: 0.5 Discharge Structure Riser Height: 0 ft. Riser Diameter: 0 in. Element Flows To: Outlet 1 Outlet 2 Gravel Trench Bed Hydraulic Table stage(ft) Area(ac) Volume(ac-ft) Discharge(c£s) Infilt(cfs) 0.0000 0.013 0.000 0.000 0.000 0.0194 0.013 0.000 0.000 0.003 0.0389 0.013 0.000 0.000 0.003 0.0583 0.013 0.000 0.000 0.003 0.0778 0.013 0.000 0.000 0.003 0.0972 0.013 0.000 0.000 0.003 0.1167 0.013 0.000 0.000 0.003 0.1361 0.013 0.000 0.000 0.003 0.1556 0.013 0.000 0.000 0.003 0.1750 0.013 0.000 0.000 0.003 0.1944 0.013 0.000 0.000 0.003 0.2139 0.013 0.001 0.000 0.003 0.2333 0.013 0.001 0.000 0.003 0.2528 0.013 0.001 0.000 0.003 0.2722 0.013 0.001 0.000 0.003 0.2917 0.013 0.001 0.000 0.003 0.3111 0.013 0.001 0.000 0.003 0.3306 0.013 0.001 0.000 0.003 0.3500 0.013 0.001 0.000 0.003 0.3694 0.013 0.001 0.000 0.003 0.3889 0.013 0.001 0.000 0.003 0.4083 0.013 0.002 0.000 0.003 0.4278 0.013 0.002 0.000 0.003 0.4472 0.013 0.002 0.000 0.003 0.4667 0.013 0.002 0.000 0.003 0.4861 0.013 0.002 0.000 0.003 0.5056 0.013 0.002 0.000 0.003 0.5250 0.013 0.002 0.000 0.003 0.5444 0.013 0.002 0.000 0.003 0.5639 0.013 0.002 0.000 0.003 0.5833 0.013 0.002 0.000 0.003 0.6028 0.013 0.002 0.000 0.003 0.6222 0.013 0.003 0.000 0.003 0.6417 0.013 0.003 0.000 0.003 0.6611 0.013 0.003 0.000 0.003 0.6806 0.013 0.003 0.000 0.003 0.7000 0.013 0.003 0.000 0.003 0.7194 0.013 0.003 0.000 0.003 0.7389 0.013 0.003 0.000 0.003 0.7583 0.013 0.003 0.000 0.003 0.7778 0.013 0.003 0.000 0.003 0.7972 0.013 0.003 0.000 0.003 0.8167 0.013 0.003 0.000 0.003 0.8361 0.013 0.004 0.000 0.003 0.8556 0.013 0.004 0.000 0.003 0.8750 0.013 0.004 0.000 0.003 0.8944 0.013 0.004 0.000 0.003 0.9139 0.013 0.004 0.000 0.003 0.9333 0.013 0.004 0.000 0.003 0.9528 0.013 0.004 0.000 0.003 0.9722 0.013 0.004 0.000 0.003 0.9917 0.013 0.004 0.000 0.003 1.0111 0.013 0.004 0.000 0.003 1.0306 0.013 0.005 0.000 0.003 1.0500 0.013 0.005 0.000 0.003 1.0694 0.013 0.005 0.000 0.003 1.0889 0.013 0.005 0.000 0.003 1.1083 0.013 0.005 0.000 0.003 1.1278 0.013 0.005 0.000 0.003 1.1472 0.013 0.005 0.000 0.003 1.1667 0.013 0.005 0.000 0.003 1.1861 0.013 0.005 0.000 0.003 1.2056 0.013 0.005 0.000 0.003 1.2250 0.013 0.005 0.000 0.003 1.2444 0.013 0.006 0.000 0.003 1.2639 0.013 0.006 0.000 0.003 1.2833 0.013 0.006 0.000 0.003 1.3028 0.013 0.006 0.000 0.003 1.3222 0.013 0.006 0.000 0.003 1.3417 0.013 0.006 0.000 0.003 1.3611 0.013 0.006 0.000 0.003 1.3806 0.013 0.006 0.000 0.003 1.4000 0.013 0.006 0.000 0.003 1.4194 0.013 0.006 0.000 0.003 1.4389 0.013 0.006 0.000 0.003 1.4583 0.013 0.007 0.000 0.003 1.4778 0.013 0.007 0.000 0.003 1.4972 0.013 0.007 0.000 0.003 1.5167 0.013 0.007 0.000 0.003 1.5361 0.013 0.007 0.000 0.003 1.5556 0.013 0.007 0.000 0.003 1.5750 0.013 0.007 0.000 0.003 1.5944 0.013 0.007 0.000 0.003 1.6139 0.013 0.007 0.000 0.003 1.6333 0.013 0.007 0.000 0.003 1.6528 0.013 0.008 0.000 0.003 1.6722 0.013 0.008 0.000 0.003 1.6917 0.013 0.008 0.000 0.003 1.7111 0.013 0.008 0.000 0.003 1.7306 0.013 0.008 0.000 0.003 1.7500 0.03.3 0.008 0.000 0.003 Name Rec Space N Basin Bypass: No GroundWater: No Pervious Land Use Acres C, Lawn, Flat .049 Pervious Total 0.049 Impervious Land Use Acres SIDEWALKS FLAT 0.0184 Impervious Total 0.0184 Basin Total 0.0674 Element Flows To: Surface Interflow Groundwater Gravel Trench Bed 1 Gravel Trench Bed 1 ANALYSIS RESULTS Stream Protection Duration Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.0674 Total Impervious Area:O Mitigated Landuse Totals for POC #1 Total Pervious Area:0.049 Total Impervious Area:0.0184 Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.003668 5 year 0.006073 10 year 0.007949 25 year 0.010637 50 year 0.012869 100 year 0.015299 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.0072 5 year 0.0100 10 year 0.0120 25 year 0.0149 50 year 0.0172 100 year 0.0197 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow (cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.004 0.000 1950 0.011 0.000 1951 0.006 0.000 1952 0.003 0.000 1953 0.002 0.000 1954 0.003 0.000 1955 0.004 0.000 1956 0.004 0.000 1957 0.005 0.000 1958 0.003 0.000 1959 0.002 0.000 1960 0.005 0.000 1961 0.003 0.000 1962 0.002 0.000 1963 0.003 0.000 1964 0.003 0.000 1965 0.002 0.000 1966 0.003 0.000 1967 0.005 0.000 1968 0.004 0.000 1969 0.003 0.000 1970 0.003 0.000 1971 0.003 0.000 1972 0.007 0.000 1973 0.002 0.000 1974 0.003 0.000 1975 0.006 0.000 1976 0.003 0.000 1977 0.001 0.000 1978 0.003 0.000 1979 0.001 0.000 1980 0.004 0.000 1981 0.004 0.000 1982 0.008 0.000 1983 0.003 0.000 1984 0.003 0.000 1985 0.002 0.000 1 1986 0.006 0.000 1987 0.005 0.000 1988 0.002 0.000 1989 0.001 0.000 1990 0.012 0.000 1991 0.010 0.000 1992 0.003 0.000 1 1993 0.002 0.000 IJ 1994 0.001 0.000 1995 0.003 0.000 1996 0.007 0.000 1 1997 0.005 0.000 1998 0.004 0.000 1999 0.008 0.000 } 2000 0.004 0.000 l 2001 0.001 0.000 2002 0.005 0.000 2003 0.004 0.000 1 2004 0.011 0.000 J 2005 0.003 0.000 2006 0.004 0.000 1 2007 0.016 0.000 2008 0.010 0.000 fj 2009 0.005 0.000 I f J I I I j Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0160 0.0000 2 0.0116 0.0000 3 0.0110 0.0000 4 0.0106 0.0000 5 0.0095 0.0000 6 0.0095 0.0000 7 0.0081 0.0000 8 0.0081 0.0000 9 0.0072 0.0000 10 0.0069 0.0000 11 0.0058 0.0000 12 0.0057 0.0000 13 0.0057 0.0000 14 0.0053 0.0000 15 0.0053 0.0000 16 0.0052 0.0000 17 0.0051 0.0000 18 0.0051 0.0000 19 0.0049 0.0000 20 0.0047 0.0000 21 0.0045 0.0000 22 0.0044 0.0000 23 0.0043 0.0000 24 0.0042 0.0000 25 0.0041 0.0000 26 0.0040 0.0000 27 0.0039 0.0000 28 0.0038 0.0000 29 0.0037 0.0000 30 0.0035 0.0000 31 0.0035 0.0000 32 0.0034 0.0000 33 0.0033 0.0000 34 0.0033 0.0000 35 0.0032 0.0000 36 0.0032 0.0000 37 0.0032 0.0000 38 0.0032 0.0000 39 0.0030 0.0000 40 0.0030 0.0000 41 0.0030 0.0000 42 0.0030 0.0000 43 0.0030 0.0000 44 0.0029 0.0000 45 0.0028 0.0000 46 0.0028 0.0000 47 0.0028 0.0000 48 0.0025 0.0000 49 0.0024 0.0000 50 0.0024 0.0000 51 0.0023 0.0000 52 0.0023 0.0000 53 0.0020 0.0000 54 0.0018 0.0000 55 0.0017 0.0000 56 0.0017 0.0000 57 0.0015 0.0000 58 0.0014 0.0000 59 0.0012 0.0000 60 0.0011 0.0000 61 0.0010 0.0000 Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0018 2421 0 0 Pass 0.0019 2092 0 0 Pass 0.0021 1817 0 0 Pass 0.0022 1557 0 0 Pass 0.0023 1361 0 0 Pass 0.0024 1193 0 0 Pass 0.0025 1038 0 0 Pass 0.0026 911 0 0 Pass 0.0027 801 0 0 Pass 0.0028 698 0 0 Pass 0.0029 616 0 0 Pass 0.0031 548 0 0 Pass 0.0032 492 0 0 Pass 0.0033 432 0 0 Pass 0.0034 393 0 0 Pass 0.0035 348 0 0 Pass 0.0036 318 0 0 Pass 0.0037 290 0 0 Pass 0.0038 254 0 0 Pass 0.0040 224 0 0 Pass 0.0041 199 0 0 Pass 0.0042 173 0 0 Pass 0.0043 154 0 0 Pass 0.0044 133 0 0 Pass 0.0045 119 0 0 Pass 0.0046 109 0 0 Pass 0.0047 99 0 0 Pass 0.0048 88 0 0 Pass 0.0050 80 0 0 Pass 0.0051 71 0 0 Pass 0.0052 65 0 0 Pass 0.0053 58 0 0 Pass 0.0054 54 0 0 Pass 0.0055 53 0 0 Pass 0.0056 48 0 0 Pass 0.0057 42 0 0 Pass 0.0058 41 0 0 Pass 0.0060 40 0 0 Pass 0.0061 38 0 0 Pass 0.0062 37 0 0 Pass 0.0063 36 0 0 Pass 0.0064 33 0 0 Pass 0.0065 33 0 0 Pass 0.0066 31 0 0 Pass 0.0067 30 0 0 Pass 0.0068 30 0 0 Pass 0.0070 28 0 0 Pass 0.0071 26 0 0 Pass 0.0072 24 0 0 Pass 0.0073 22 0 0 Pass 0.0074 21 4 0 Pass 0.0075 20 0 0 Pass 0.0076 20 0 0 Pass 0.0077 20 0 0 Pass 0.0079 19 0 0 Pass 0.0080 18 0 ❑ Pass 0.0081 17 0 0 Pass 0.0082 14 0 ❑ Pass 0.0083 13 0 0 Pass 0.0084 13 0 0 Pass 0.0085 13 0 0 Pass 0.0086 13 0 0 Pass 0.0087 12 0 0 Pass 0.0089 12 0 0 Pass 0.0090 12 0 0 Pass 0.0091 11 0 0 Pass 0.0092 10 0 0 Pass 0.0093 10 0 0 Pass 0.0094 9 0 0 Pass 0.0095 8 0 0 Pass 0.0096 7 0 0 Pass 0.0097 7 0 0 Pass 0.00.99 7 0 0 Pass 0.0100 7 0 0 Pass 0.0101 7 0 0 Pass 0.0102 6 0 0 Pass 0.0103 6 0 0 Pass 0.0104 6 0 0 Pass 0.0105 5 0 0 Pass 0.0106 3 0 0 Pass 0.0108 3 0 0 Pass 0.0109 3 0 0 Pass 0.0110 3 0 0 Pass 0.0111 2 0 0 Pass 0.0112 2 0 0 Pass 0.0113 2 0 0 Pass 0.0114 2 0 0 Pass 0.0115 2 0 0 Pass 0.0116 1 0 0 Pass 0.0118 1 0 0 Pass l 0.0119 1 0 0 Pass J 0.0120 1 0 0 Pass 0.0121 1 0 0 Pass 0.0122 1 0 0 Pass 0.0123 1 0 0 Pass 0.0124 1 0 0 Pass 0.0125 1 0 0 Pass 0.0126 1 0 0 Pass 0.0128 1 0 0 Pass 0.0129 1 0 0 Pass Water Quality BMP Flow and Volume for POC #1 on-line facility volume: 0.0000 acre-feet on-line facility target flow: 0.0000 cfs. Adjusted for 15 min: 0.0000 cfs. Off-line facility target flow: 0.0000 cfs. ( Adjusted for 15 min: 0.0000 cfs. J Perind and Impind Changes No changes have been made. �J This program and accompanying documentation are provided 'as -is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek _J Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed J or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business J interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2013; All Rights Reserved. J J 1 J J W 'HM2012 PROJECT REPORT Project Name: FWTH Rec Sp S Site Name: FW Townhomes Site Address: 2245 S 333rd St City : Federal Way Report Date: 7/16/2013 Gage : Seatac Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 1.00 Version : 2013/06/06 Low Flow Threshold for POC 1 : 50 Percent of the 2 Year High Flow Threshold for POC 1: 50 year Hourly Time -Step PREDEVELOPED LAND USE Name : Rec Space S Basin Bypass: No GroundWater: No Pervious Land Use Acres C, Lawn, Flat .1061 Pervious Total 0.1061 Impervious Land Use Acres Impervious Total 0 Basin Total 0.1061 Element Flows To: Surface Interflow MITIGATED LAND USE Name : Gravel Trench Bed 1 Bottom Length: 40.00 ft. Bottom Width: 24.00 ft. Groundwater J Trench bottom slope 1: 0.0001 To 1 Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 1.75 Pour Space of material for first layer: 0.35 Material thickness of second layer: 0 Pour Space of material for second layer: 0 Material thickness of third layer: 0 Pour Space of material for third layer: 0 Infiltration On Infiltration rate: 0.44 Infiltration safety factor: 0.5 Discharge Structure Riser Height: 0 ft. Riser Diameter: 0 in. Element Flows To: Outlet 1 Outlet 2 Gravel Trench Bed Hydraulic Table stage(£t) Area(ac) Volume(ac-ft) Discharge(cfs) Infilt(cfsl 0.0000 0.022 0.000 0.000 0.000 0.0194 0.022 0.000 0.000 0.004 0.0389 0.022 0.000 0.000 0,004 0.0583 0.022 0.000 0.000 0.004 0.0778 0.022 0.000 0.000 0.004 0.0972 0.022 0.000 0.000 0.004 0.1167 0.022 0.000 0.000 0.004 0.1361 0.022 0.001 0.000 0.004 0.1556 0.022 0.001 0.000 0.004 0.1750 0.022 0.001 0.000 0.004 0.1944 0.022 0.001 0.000 0.004 0.2139 0.022 0.001 0.000 0.004 0.2333 0.022 0.001 0.000 0.004 0.2528 0.022 0.001 0.000 0.004 0.2722 0.022 0.002 0.000 0.004 0.2917 0.022 0.002 0.000 0.004 1 0.3111 0.022 0.002 0.000 0.004 J 0.3306 0.022 0.002 0.000 0.004 0.3500 0.022 0.002 0.000 0.004 0.3694 0.022 0.002 0.000 0.004 J 0.3889 0.022 0.003 0.000 0.004 0.4083 0.022 0.003 0.000 0.004 0.4278 0.022 0.003 0.000 0.004 J 0.4472 0.4667 0.022 0.022 0.003 0.003 0.000 0.000 0.004 0.004 0.4861 0.022 0.003 0.000 0.004 0.5056 0.022 0.003 0.000 0.004 0.5250 0.022 0.004 0.000 0.004 J 0.5444 0.022 0.004 0.000 0.004 0.5639 0.022 0.004 0.000 0.004 0.5833 0.022 0.004 0.000 0.004 0.6028 0.022 0.004 0.000 0.004 1 0.6222 0.022 0.004 0.000 0.004 0.6117 0.022 0.001 0.000 0.004 0.6611 0.022 0.005 0.000 0.004 1 0.6806 0.022 0.005 0.000 0.004 0.7000 0.022 0.005 0.000 0.004 0.7194 0.7389 0.022 0.022 0.005 0.005 0.001 0.000 0.004 0.004 0.7583 0.022 0.005 0.000 0.004 0.7778 0.022 0.006 0.000 0.004 0.7972 0.022 0.006 0.000 0.004 0.8167 0.022 0.006 0.000 0.004 0.8361 0.022 0.006 0.000 0.004 0.8556 0.022 0.006 0.000 0.004 0.8750 0,022 0.006 0.000 0.004 0.8944 0.022 0.006 0.000 0.004 0.9139 0.022 0.007 0.000 0.004 0.9333 0.022 0.007 0.000 0.004 0.9528 0.022 0.007 0.000 0.004 0.9722 0.022 0.007 0.000 0.004 _l 0.9917 0.022 0.007 0.000 0.004 I 1.0111 0.022 0.007 0.000 0.004 1.0306 0.022 0.007 0.000 0.004 1.0500 0.022 0.008 0.000 0.004 1.0694 0.022 0.008 0.000 0.004 1.0889 0.022 0.008 0.000 0.004 1.1083 0.022 0.008 0.000 0.004 1.1278 0.022 0.008 0.000 0.004 1.1472 0.022 0.008 0.000 0.004 1.1667 0.022 0.009 0.000 0.004 1.1861 0.022 0.009 0.000 0.004 1.2056 0.022 0.009 0.000 0.004 1.2250 0.022 0.009 0.000 0.004 1.2444 0.022 0.009 0.000 0.004 1.2639 0.022 0.009 0.000 0.004 1.2833 0.022 0.009 0.000 0.004 1.3028 0.022 0.010 0.000 0.004 1.3222 0.022 0.010 0.000 0.004 1.3417 0.022 0.010 0.000 0.004 1.3611 0.022 0.010 0.000 0.004 1.3806 -0.022 0.010 0.000 0.004 1.4000 0.022 0.010 0.000 0.004 1.4194 0.022 0.010 0.000 0.004 1.4389 0.022 0.011 0.000 0.004 1.4583 0.022 0.011 0.000 0.004 1.4778 0.022 0.011 0.000 0.004 1.4972 0.022 0.011 0.000 0.004 1.5167 0.022 0.011 0.000 0.004 1.5361 0.022 0.011 0.000 0.004 1.5556 0.022 0.012 0.000 0.004 1.5750 0.022 0.012 0.000 0.004 1.5944 0.022 0.012 0.000 0.004 1.6139 0.022 0.012 0.000 0.004 1.6333 0.022 0.012 0.000 0.004 1.6528 0.022 0.012 0.000 0.004 1.6722 0.022 0.012 0.000 0.004 1.6917 0.022 0.013 0.000 0.004 `I jJ 1.7111 0.022 0.013 0.000 0.004 1.7306 0.022 0.013 0.000 0.004 1.7500 0.022 0.013 0.000 0.004 Name Rec Space S Basin Bypass: No GroundWater: No Pervious Land Use Acres C, Lawn, Flat 0.0831 Pervious Total 0.0831 Impervious Land Use Acres SIDEWALKS FLAT 0.023 Impervious Total 0.023 Basin Total 0.1061 Element Flows To: Surface Interflow Gravel Trench Bed 1 Gravel Trench Bed 1 ANALYSIS RESULTS Stream Protection Duration Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.1061 Total Impervious Area:O Mitigated Landuse Totals for POC #1 Total Pervious Area:0.0831 Total Impervious Area:0.023 Groundwater Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.005775 5 year 0.009561 J 10 year 0.012513 25 year 0.016745 50 year 0.020259 100 year 0.024084 Flow Frequency Return Periods for Un-Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.0101 5 year 0.0143 10 year 0.0175 25 year 0.0220 50 year 0.0257 100 year 0.0297 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. Year Predeveloped Mitigated 1949 0.007 0.000 1950 0.017 0.000 1951 0.009 0.000 1952 0.004 0.000 1953 0.003 0.000 1954 0.005 0.000 1955 0.007 0.000 1956 0.007 0.000 1957 0.007 0.000 1958 0.005 0.000 1959 0.004 0.000 1960 0.008 0.000 1961 0.004 0.000 1962 0.003 0.000 1963 0.005 0.000 1964 0.005 0.000 1965 0.004 0.000 1966 0.004 0.000 1967 0.008 0.000 1968 0.006 0.000 1969 0.004 0.000 1970 0.005 0.000 1971 0.005 0.000 1972 0.011 0.000 1973 0.004 0.000 1974 0.005 0.000 1975 0.009 0.000 1976 0.005 0.000 1977 0.002 0.000 1978 0.005 0.000 1979 0.002 0.000 1980 0.007 0.000 1981 0.006 0.000 1982 0.013 0.000 1983 0.005 0.000 POC #1 1984 0.005 0.000 1985 0.003 0.000 1986 0.009 0.000 1987 0.008 0.000 1988 0.003 0.000 1989 0.002 0.000 1990 0.018 0.000 1991 0.015 0.000 1992 0.005 0.000 1993 0.004 0.000 1994 0.002 0.000 1995 0.005 0.000 1996 0.011 0.000 1997 0.008 0.000 1998 0.006 0.000 1999 0.013 0.000 2000 0.006 0.000 2001 0.002 0.000 2002 0.008 0.000 2003 0.006 0.000 2004 0.017 0.000 2005 0.005 0.000 2006 0.006 0.000 2007 0.025 0.000 2008 0.015 0.000 2009 0.008 0.000 Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. Rank Predeveloped Mitigated 1 0.0252 0.0000 2 0.0182 0.0000 3 0.0174 0.0000 4 0.0167 0.0000 5 0.0150 0.0000 6 0.0150 0.0000 7 0.0127 0.0000 8 0.0127 0.0000 9 0.0113 0.0000 10 0.0109 0.0000 11 0.0092 0.0000 12 0.0090 0.0000 13 0.0089 0.0000 14 0.0083 0.0000 15 0.0083 0.0000 16 0.0081 0.0000 17 0.0081 0.0000 18 0.0080 0.0000 19 0.0076 0.0000 20 0.0074 0.0000 21 0.0070 0.0000 22 0.0068 0.0000 23 .0.0068 0.0000 24 0.0066 0.0000 25 0.0064 0:0000 26 0.0064 0.0000 POC #1 I I I I I j j 27 0.0062 0.0000 28 0.0060 0.0000 29 0.0058 0.0000 30 0.0055 0.0000 31 0.0055 0.0000 32 0.0054 0.0000 33 0.0052 0.0000 34 0.0051 0.0000 35 0.0050 0.0000 36 0.0050 0.0000 37 0.0050 0.0000 38 0.0050 0.0000 39 0.0047 0.0000 40 0.0047 0.0000 41 0.0047 0.0000 42 0.0047 0.0000 43 0.0046 0.0000 44 0.0045 0.0000 45 0.0045 0.0000 46 0.0045 0.0000 47 0.0044 0.0000 48 0.0040 0.0000 49 0.0038 0.0000 50 0.0038 0.0000 51 0.0036 0.0000 52 0.0036 0.0000 53 0.0032 0.0000 54 0.0029 0.0000 55 0.0026 0.0000 56 0.0026 0.0000 57 0.0024 0.0000 58 0.0023 0.0000 59 0.0019 0.0000 60 0.0017 0.0000 61 0.0015 0.0000 Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0029 2422 0 0 Pass 0.0031 2092 0 0 Pass 0.0032 1814 0 0 Pass 0.0034 1557 0 0 Pass 0..0036 1360 0 0 Pass 0.0038 1193 0 0 Pass 0.0039 1038 0 0 Pass 0.0041 911 0 0 Pass 0.0043 801 0 0 Pass 0.0045 698 0 0 Pass 0.0046 616 0 0 Pass 0.0048 548 0 0 Pass 0.0050 491 0 0 Pass j I 0.0052 432 0 0 Pass 0.0053 393 0' 0 Pass 0.0055 348 0 0 Pass 0.0057 318 0 0 Pass 0.0059 290 0 0 Pass -� 0.0060 254 0 0 Pass 0.0062 224 0 0 Pass 0.0064 199 0 0 Pass 0.0066 173 0 0 Pass ] 0.0067 154 0 0 Pass 0.0069 133 0 0 Pass 0.0071 119 0 0 Pass -� 0.0073 109 0 0 Pass 0.0074 99 0 0 Pass 0.0076 88 0 0 Pass 0.0078 80 0 0 Pass } 0.0080 71 0 0 Pass I 0.0082 65 0 0 Pass 0.0083 58 0 0 Pass 0.0085 54 0 0 Pass 0.0087 53 0 0 Pass 0.0089 48 0 0 Pass 0.0090 42 0 0 Pass 0.0092 41 0 0 Pass 0.0094 40 ❑ 0 Pass 0.0096 38 0 0 Pass 0.0097 37 0 0 Pass 1 0.0099 36 0 0 Pass 0.0101 33 0 0 Pass 0.0103 33 0 0 Pass 0.0104 31 0 0 Pass J 0.0106 30 0 0 Pass + 0.0108 30 0 0 Pass 0.0110 28 0 0 Pass ' 0.0111 26 0 0 Pass 0.0113 24 0 0 Pass _1 0.0115 22 0 0 Pass 0.0117 21 0 0 Pass 1 0.0118 20 0 0 Pass 0.0120 20 0 0 Pass 0.0122 20 0 0 Pass 1 0.0124 19 0 0 Pass j 0.0125 18 0 0 Pass 0.0127 17 0 0 Pass 0.0129 14 0 0 Pass 0.0131 13 0 0 Pass 0.0132 13 0 0 Pass 0.0134 13 0 0 Pass 0.0136 13 0 0 Pass 0.0138 12 0 0 Pass 0.0139 12 0 0 Pass 0.0141 12 0 0 Pass 0.0143 11 0 0 Pass 0.0145 10 0 0 Pass 0.0146 10 0 0 Pass i 0.0141 9 0 0 Pass 0.0150 8 0 0 Pass f J 0.0152 7 0 0 Pass 0.0153 7 0 0 Pass } 0.0155 7 0 0 Pass I 0.0157 7 0 0 Pass 0.0159 7 0 0 Pass _ 0.0160 6 0 0 Pass 0.0162 6 0 0 Pass 0.0164 6 0 0 Pass 0.0166 5 0 0 Pass 0.0167 3 0 0 Pass 0.0169 3 0 0 Pass 0.0171 3 0 0 Pass 0.0173 3 0 0 Pass 0.0175 2 0 0 Pass 0.0176 2 0 0 Pass 0.0178 2 0 0 Pass 0.0180 2 0 0 Pass 0.0182 2 0 0 Pass ' 0.0183 1 0 0 Pass 0.0185 1 0 0 Pass 0.0187 1 0 0 Pass 1 0.0189 1 0 0 Pass 0.0190 1 0 0 Pass 0.0192 1 0 0 Pass 0.0194 1 0 0 Pass 0.0196 1 0 0 Pass 0.0197 1 0 0 Pass 0.0199 1 0 0 Pass 0.0201 1 0 0 Pass 0.0203 1 0 0 Pass Water Quality BMB Flow and Volume for POC #1 On-line facility volume: 0 acre-feet On-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfa. Off-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs. Perind and Impind Changes No changes have been made. This program and accompanying documentation are provided 'as -is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed L� or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2013; All Rights Reserved. WWHM2012 PROJECT REPORT Project Name: FWTH bypass Site Name: FW Townhomes Site Address: 2245 S 333rd St City : Federal Way Report Date: 7/15/2013 Gage : Seatac Data Start : 1948/10/01 00:00 Data End : 2009/09/30 00:00 Precip Scale: 1.00 Version : 2013/06/06 Low Flow Threshold for POC 1 : 50 Percent of the 2 Year High Flow Threshold for POC 1: 50 year Hourly Time -Step PREDEVELOPED LAND USE Name : Predeveloped Basin Bypass: No Groundwater: No Pervious Land Use Acres C, Pasture, Flat .5573 Pervious Total 0.5573 Impervious Land Use Acres ROADS FLAT 0.217 ROOF TOPS FLAT 0.0553 Impervious Total 0.2723 Basin Total 0.8296 Element Flows To: Surface Interflow Groundwater MITIGATED LAND USE Name : Bypass Basin Bypass: No GroundWater: No Pervious Land Use Acres C, Lawn, Flat .007 C, Lawn, Mod .084 Pervious Total 0.091 Impervious Land Use Acres ROADS FLAT 0.0915 SIDEWALKS FLAT 0.0186 Impervious Total 0.1101 Basin Total 0.2011 Element Flows To: Surface Interflow ANALYSIS RESULTS Stream Protection Duration Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.5573 Total Impervious Area:0.2723 Mitigated Landuse Totals for POC #1 Total Pervious Area:0.091 Total Impervious Area:0.1101 Groundwater Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.081554 5 year 0.105627 10 year 0.122645 25 year 0.145426 50 year 0.163354 100 year 0.182127 Flow Frequency Return Periods for Mitigated. Return Period Flow(cfs) 2 year 0.033176 5 year 0.043314 10 year 0.050526 25 year 0.060228 50 year 0.067896 100 year 0.075955 Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. Year Predeveloped Mitigated 1949 0.088 0.034 1950 0.138 0.057 1951 0.093 0.035 1952 0.064 0.026 1953 0.060 0.025 1954 0.076 0.031 1955 0.083 0.032 1956 0.081 0.031 1957 0.094 0.038 1958 0.078 0.032 1959 0.062 0.024 1960 0.082 0.032 1961 0.068 0.028 1962 0.061 0.027 1963 0.068 0.027 1964 0.080 0.032 1965 0.068 0.028 1966 0.071 0.028 1967 0.091 0.042 1968 0.102 0,047 1969 0.068 0.026 1970 0.071 0.028 1971 0.069 0.027 1972 0.107 0.043 1973 0.066 0.025 1974 0.068 0.029 1975 0.102 0.040 1976 0.069 0.026 1977 0.070 0.030 1978 0.092 0.040 1979 0.089 0.038 1980 0.089 0.036 1981 0.092 0.039 1982 0.132 0.055 1983 0.083 0.036 1984 0.073 0.030 1985 0.060 0.026 1986 0.100 0.037 1987 0.103 0.045 1988 0.050 0.020 1989 0.062 0.025 1990 0.152 0.061 1991 0.139 0.056 1992 0.073 0.029 POC #1 POC #1 j I I I j j j 1993 0.048 0.019 1994 0.051 0.021 1995 0.069 0.029 1996 0.109 0.040 1997 0.094 0.036 1998 0.078 0.037 1999 0.147 0.071 2000 0.088 0.036 2001 0.066 0.027 2002 0.089 0.037 2003 0.082 0.034 2004 0.163 0.068 2005 0.073 0.029 2006 0.072 0.026 2007 0.177 0.069 2008 0.138 0.055 2009 0.092 0.035 Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. Rank Predeveloped Mitigated 1 0.1771 0.0713 2 0.1634 0.0693 3 0.1519 0.0676 4 0.1473 0.0614 5 0.1392 0.0567 6 0.1384 0.0558 7 0.1381 0.0548 8 0.1318 0.0545 9 0.1091 0.0467 10 0.1072 0.0446 11 0.1032 0.0428 12 0.1018 0.0422 13 0.1016 0.0403 14 0.1002 0.0401 15 0.0944 0.0397 16 0.0939 0.0387 17 0.0934 0.0377 18 0.0920 0.0375 19 0.0920 0.0372 .20 0.0918 0.0372 21 0.0912 0.0369 22 0.0892 0.0364 23 0.0888 0.0363 24 0.0885 0.0363 25 0.0880 0.0363 26 0.0876 0.0353 27 0.0832 0.0352 28 0.0827 0.0341 29 0.0825 0.0336 30 0.0823 0.0324 31 0.0813 0.0324 32 0.0797 0.0321 33 0.0783 0.0318 34 0.0775 0.0310 35 0.0765 0.0309 POC #1 j 36 0.0732 0.0300 37 0.0729 0.0296 38 0.0726 0.0292 39 0.0723 0.0291 40 0.0713 0.0290 41 0.0711 0.0289 42 0.0697 0.0282 43 0.0692 0.0282 44 0.0692 0.0278 45 0.0688 0.0276 46 0.0685 0.0274 47 0.0684 0.0273 48 0.0682 0.0271 49 0.0682 0.0267 50 0.0678 0.0263 51 0.0658 0.0262 52 0.0657 0.0262 53 0.0636 0.0260 54 0.0624 0.0260 55 0.0617 0.0254 56 0.0608 0.0252 57 0.0604 0.0249 58 0.0597 0.0245 59 0.0510 0.0215 60 0.0497 0.0201 61 0.0480 0.0186 Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0408 1416 45 3 Pass 0.0420 1302 39 2 Pass 0.0433 1188 33 2 Pass 0.0445 1081 32 2 Pass 0.0457 981 28 2 Pass 0.0470 914 25 2 Pass 0.0482 844 24 2 Pass 0.0494 773 18 2 Pass 0.0507 703 18 2 Pass 0.0519 641 16 2 Pass 0.0532 592 12 2 Pass 0.0544 552 12 2 Pass 0.0556 520 9 1 Pass 0.0569 478 6 1 Pass 0.0581 448 6 1 Pass 0.0593 420 6 1 Pass 0.0606 398 6 1 Pass 0.0618 366 5 1 Pass 0.0631 347 5 1 Pass 0.0643 329 4 1 Pass 0.0655 298 3 1 Pass 0.0668 284 3 1 Pass i J J J I I j j 0.0680 263 2 0 Pass 0.0693 236 2 0 Pass 0.0705 223 1 0 Pass 0.0717 206 0 0 Pass 0.0730 194 0 0 Pass 0.0742 180 0 0 Pass 0.0754 168 0 0 Pass 0.0767 153 0 0 Pass 0.0779 148 0 0 Pass 0.0792 135 0 0 Pass 0.0804 121 0 0 Pass 0.0816 117 0 0 Pass 0.0829 111 0 0 Pass 0.0841 106 0 0 Pass 0.0854 98 0 0 Pass 0.0866 91 0 0 Pass 0.0878 84 0 0 Pass 0.0891 77 0 0 Pass 0.0903 68 0 0 Pass 0.0915 66 0 0 Pass 0.0928 62 0 0 Pass 0.0940 56 0 0 Pass 0.0953 54 0 0 Pass 0.0965 53 0 0 Pass 0.0977 53 0 0 Pass 0.0990 49 0 0 Pass 0.1002 48 0 0 Pass 0.1014 46 0 0 Pass 0.1027 40 0 0 Pass 0.1039 37 0 0 Pass 0.1052 37 0 0 Pass 0.1064 35 0 0 Pass 0.1076 34 0 0 Pass 0.1089 31 0 0 Pass 0.1101 30 0 0 Pass 0.1114 30 0 0 Pass 0.1126 30 0 0 Pass 0.1138 30 0 0 Pass 0.1151 29 0 0 Pass 0.1163 28 ❑ 0 Pass 0.1175 27 0 0 Pass 0.1188 25 ❑ 0 Pass 0.1200 25 0 0 Pass 0.1213 25 0 0 Pass 0.1225 24 0 0 Pass 0.1237 24 0 0 Pass 0.1250 22 0 0 Pass 0.1262 20 0 0 Pass 0.1274 18 0 0 Pass 0.1287 17 0 0 Pass 0.1299 16 0 0 Pass 0.1312 16 0 0 Pass 0.1324 13 0 0 Pass 0.1336 13 0 0 Pass 0.1349 12 0 0 Pass 0.1361 12 0 0 Pass 0.1374 11 0 0 Pass j 0.1386 9 0 0 Pass 0.1398 8 0 0 Pass -1 0.1411, 8 0 0 Pass 0.1423 6 0 0 Pass 1( 0.1435 6 0 0 Pass 0.144E 6 0 0 Pass 0.1460 6 0 0 Pass 0.1473 6 0 0 Pass 0.1485 5 0 0 Pass -� 0.1497 5 0 0 Pass 0.1510 5 0 0 Pass 0.1522 4 0 0 Pass 0.1534 4 0 0 Pass 0.1547 4 0 0 Pass 0.1559 3 0 0 Pass 0.1572 3 0 0 Pass -� 0.1584 0.1596 2 2 0 0 0 0 Pass Pass 0.1609 2 0 0 Pass 0.1621 2 0 0 Pass 0.1634 2 0 0 Pass Perind and Impind Changes No changes have been made. This program and accompanying documentation are provided 'as -is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2013; All Rights Reserved. I J APPENDIX B Geotedmical Information Geotechnical Report December 20, 2012 Stormwater Infiltration Analysis, June 10, 2013 P1i.253-896-1011 Fx.253-896-2633 RTI, LLC c/o Barbara A. Napier 310-29'h Street NE, Suite 101 Puyallup, WA 98372 (253) 242-4282 G-eoR.esources, LLC 5007 Pacific Hwy. E, Suite 16 Fife, Waslibigton 98424-2649 April 30, 2008 Updated December 20, 2012 Updated Geotechnical Engineering Report Proposed Townhomes 2245 — South 333`d Street Federal Way, Washington PN: 7978200180 Job No: DreamBuilders.FederalWay.GR INTRODUCTION This updated report summarizes our site observations and provides our geotechnical engineering conclusions and recommendations for the proposed townhomes to be constructed at 2245 — South 333rd Street in the City of Federal Way, Washington. The site location, is generally shown on the attached Site Vicinity Map, Figure 1. Our understanding of the project is based on our discussions with you, our April 17, 2008 site visit, and our experience in the area. We understand current plans call for construction of several new townhouses and may include daylight basement configurations. Additional development will include associated surface parking areas, driveways, and underground utilities including connecting to the municipal stormwater system along South 333rd Street. We anticipate that the buildings will be supported on conventional spread and continuous footings with a slab on grade floor. The proposed site configuration and existing topography is illustrated on the Site Plan, Figure 2. SCOPE The purpose of our services was to evaluate the surface and subsurface conditions at the site as a basis for addressing the City of Federal Way Critical Areas Ordinance (CAO) and addressing the feasibility of the proposed development. We have also included geotechnical recommendations and design criteria for the project. Specifically, the scope of services for this project included the following: 1. Reviewing the available geologic, hydrogeologic and geotechnical data for the site area. 2. Performing a geological reconnaissance of the site to assess the site's soil, groundwater and slope conditions. 3. Exploring shallow subsurface conditions at the site by monitoring the excavation of a series of backhoe test pits at the site. 4. Evaluating the engineering characteristics of the soils encountered at the site, as appropriate. RTI, LLC. Federal Way December 20, 2012 Page 2 5. Providing geotechnical recommendations for site grading including site preparation, subgrade preparation, fill placement criteria, suitability of on -site soils for use as structural fill, temporary and permanent cut and fill slopes, drainage and erosion control measures. 6. Providing recommendations and design criteria for building foundation and floor slab support, including allowable bearing capacity, subgrade modulus, lateral resistance values and estimates of settlement. 7. Providing recommendations and design criteria for the design of conventional subgrade/retaining walls, including backfill and drainage requirements, lateral design loads, and lateral resistance values. 8. Providing site -specific seismic criteria based on the subsurface conditions encountered at the site. 9. Providing pavement subgrade and design recommendations for the proposed development. 10. Preparing a written report summarizing our observations, conclusions and recommendations along with the supporting data. EXPLORATION METHODS We explored surface and subsurface conditions on April 17, 2008. Our exploration and testing program was comprised of the following elements: A visual surface reconnaissance of the site; Excavating two test pits (designated TP-1 through TP-2) at selected locations across the site; A review of published geologic and seismologic maps and literature. Table 1 summarizes the approximate locations, termination depths, and elevations of our pertinent subsurface explorations, and Figure 2 depicts their approximate relative locations. TABLE 1 APPROXIMATE LOCATIONS, DEPTHS, AND ELEVATIONS OF EXPLORATIONS Termination Elevation Test Pit Functional Location Depth Number I I [feet] (feet) TP-1 I West end of proposed storm water vault TP-2 South end of parcel just east of center Elevations based on by client (NAVD 12 378 6 Y/ 375 The specific number, locations, and depths of our explorations were selected by GeoResources based on the conceptual drainage design and field -adjusted by GeoResources due to access limitations (underground utilities, existing structures, steep slopes) and encountered stratigraphy. The approximate location of each test pit location was determined by pacing and taping from features shown on the provided site plan and aerial photographs. Consequently, the data listed in Table 1 and the locations depicted on Figure 2 should be considered accurate only to the degree permitted by our data sources and implied by our measuring methods. The explorations performed as part of this evaluation indicate conditions only at the RTI, LLC. Federal Way December 20, 2012 Page 3 specific locations and those actual conditions in other locations could vary. Furthermore, the nature and extent of any such variations would not become evident until additional explorations are performed or until construction activities have begun. SITE CONDITIONS Surface Conditions The site is located at 2245 — South 333`d Street in Federal Way, Washington. The site consists of one parcel that is irregular in shape, measures approximately 260 long (north to south) and varies in width from 80 feet along the south property line to 90 feet along the north property line. The total site encompasses approximately 0.64 acres. The site is bounded by residential development on the south and west, a private road on the east, and South 333`d Street on the north. The northern portion of the site is currently developed with two single family residences, driveways, and typical utilities. The developed portions of the site are vegetated with grass, assorted landscape shrubs, and isolated alder and cedar trees. The southern portion of the site is currently undeveloped with mostly alder trees, a few cedar trees, and a moderately dense understory of native vegetation and blackberry bushes. The site is generally flat to gently sloping to the southwest. Total vertical relief across the site is approximately 7 feet. The site generally slopes down from northeast to southwest at inclinations of less than 5 feet. There was an isolated slope of 15 to 20 percent along the west central property line most likely due to grading activities from previous site development. The proposed site configuration with exploration locations is shown on the attached Site Plan, Figure 2. Site Soils The USDA Natural Resources Conservation Services (NRCS) Web Soil Survey of King County indicates that the area for the proposed development is underlain by Alderwood gravelly sandy loam (AgB) that form on 0 to 6 percent slopes. The Alderwood soils are generally derived from glacial till, are listed as having a "slight' potential for erosion hazards, and are listed as being in hydrologic soils group "C". A copy of the MRCS soils map for the site area is included as Figure 3. No evidence of surficial erosion was observed at the time of our site visit. Geologic Conditions The Geologic Map of the Poverty Bay 7.5-minute quadrangle, King County Washington: by Booth, D. B., Waldron H. H., and Troost, K. G., (2003), maps the site as being underlain by glacial till (Qvt). The glacial till soils were deposited during the Vashon Stade of the Fraser Glaciation, approximately 12,000 to 15,000 years ago. The glacial till consists of a heterogeneous mixture of clay, silt, sand, and gravel that was deposited and overridden by the continental ice mass. As such, the till is considered overconsolidated and provides high strength and low compressibility characteristics. An excerpt of the above referenced map is included as Figure 4. Test Pit Procedures Subsurface conditions at the site were evaluated by digging two test pits at selected locations across the site. The test pits were excavated by a small track -mounted excavator working under contract to GeoResources, LLC. We continuously monitored the excavation of the test pit excavations and logged the subsurface conditions encountered in the test pits in general accordance with the Unified Soils Classification System described in Figure 6. Copies of the test pit and hand auger logs are included on Figure 5. RTI, LLC, Federal Way December 20, 2012 Page 4 The test pits were excavated to depths of 6'/2 and 12 feet below the existing ground surfaces. The test pits were backfilled after our observations and the soils tamped with the backhoe bucket, but not otherwise compacted. Because the soils encountered were consistent between the test pits, the geologic maps and our previous work in the area, it is our opinion that no additional subsurface explorations are required to evaluate the subsurface conditions at the site. Subsurface Conditions Our test pits encountered relatively uniform subsurface conditions that generally confirm the mapped stratigraphy. In general, our test pits encountered two feet of fill mantling medium to very dense silty sands with gravel. All test pits found a variable thickness of weathered till overlying the deep, dense to very dense glacial till. The till was encountered to the full depth explored in all of the test pits. No caving was observed in any test pits. TABLE 2 APPROXIMATE THICKNESSES, DEPTHS, AND ELEVATIONS OF SOIL LAYERS 'ENCOUNTERED IN EXPLORATIONS _ Test Pit Thickness Thickness Thickness of Depth to Elevation of Number of of Medium Dense Glacial Till Glacial Till Topsoil Fill Silty Sand (feet) (feet) (feet) (feet) (feet) TP-1 1 0 3 3/a 4 3/a 373'/4 TP-2 1 '/a 0 3 % 5 370 Elevations based on site plan provided by client (NAVD'88 Groundwater Groundwater seepage was encountered in our test pits at the time of digging. Isolated minor seepage was observed in test pit TP-1 at depths between 4.3 to 4.8 feet below ground surface. Minor groundwater seepage was observed in test pit TP-2 at depths between 3.5 to 3.8 feet below ground surface. We interpret the observed seepage and presence of mottling of weathering and (oxidization) to indicate the presence of a "perched" groundwater condition. Perched groundwater develops when the vertical infiltration of water through a shallow, more permeable soil is slowed by a deep, less permeable soil. Throughout the year, groundwater levels would likely rise and fall in response to changing precipitation patterns, off -site usage, nearby construction activities, site utilization, and other factors. Geologically Hazardous Areas Indicators -- per City of Federal Way, Chapter 18 The City of Federal Way Municipal Code, Article II, Chapter 18 defines geologically hazardous areas as those areas susceptible to erosion, landsliding, seismic, or other potentially hazardous geological processes. Landslide hazard areas are those areas potentially subject to episodic downslope movement of a mass of soil or rock including but not limited to the following areas: a. Any area with a combination of: 1. Slopes greater than 15 percent; 2. Permeable sediment (predon-iinately sand and gravel) overlying relatively impermeable sediment or bedrock (typically silt and clay); and 3. Springs or groundwater seepage. RTI, LLC. Federal Way December 20, 2012 Page 5 b. Any area which has shown movement during the Holocene epoch, from 10,000 years ago to the present, or which is underlain by mass wastage debris of that epoch. c. Any area potentially unstable as a result of rapid stream incision, stream bank erosion or undercutting by wave action. d. Any area located in a ravine or on an active alluvial fan, presently or potentially subject to inundation by debris flows or flooding. e. Those areas identified by the United States Department of Agriculture Soil Conservation Service as having a severe limitation for building site development. f. Those areas mapped as Class U (unstable), UOS (unstable old slides), and URS (unstable recent slides) by the Department of Ecology. g. Slopes having gradients greater than 80 percent subject to rockfall during seismic shaking. CONCLUSIONS Based on the results of our data review, site reconnaissance, subsurface explorations and our experience in the area, it is our opinion that the site is suitable for the proposed commercial development. Landslide Hazard Indicators — per City of Federal Way, Chapter 18 The City of Federal Way, Chapter 18 uses the above referenced 7 item checklist to define a landslide hazard area. Based on our observations of the site and review of published information, we offer the following comments. No areas with a combination of slopes greater than 15 percent, permeable sediment (predominately sand and gravel) overlying relatively impermeable sediment or bedrock (typically silt and clay), and springs or groundwater seepage. No areas which have shown movement during the Holocene epoch, from 10,000 years ago to the present, or which is underlain by mass wastage debris of that epoch. No areas potentially unstable as a result of rapid stream incision, stream bank erosion or undercutting by wave action. No areas located in a ravine or on an active alluvial fan, presently or potentially subject to inundation by debris flows or flooding. No areas identified by the United States Department of Agriculture Soil Conservation Service as having a severe limitation for building site development. No areas mapped as Class U (unstable), UOS (unstable old slides), and URS (unstable recent slides) by the Department of Ecology. No areas of slopes having gradients greater than 80 percent subject to rockfall during seismic shaking. Based on our site observations, the site does not meet the criteria outlined above for a landslide hazard area. Erosion Hazard Indicators — per City of Federal Way, Chapter 18 The City of Federal Way, Chapter 18 defines an erosion hazard area as those identified by the U.S. Department of Agriculture Natural Resources Conservation Service as having a moderate to severe, severe, or very severe erosion hazard because of natural characteristics, including vegetative cover, soil texture, slope, gradient,, and rainfall patterns, or human -induced changes to natural characteristics. The Alderwood soils (AgB) mapped as underlying the site are classified as having a "slight" potential for erosion hazards. Temporary and permanent erosion control measures will be installed and maintained during construction or as soon as practical thereafter to limit the influx of additional water to RTI, LLC. Federal Way December 20, 2012 Page 6 exposed or disturbed areas. Erosion control measures should include, but should not be limited to, berms and swales with check dams to direct surface water runoff, ground cover/protection in exposed areas and silt fences where appropriate. Graded areas should be shaped to avoid concentrations of runoff onto cut or fill slopes, natural slopes or other erosion -sensitive areas. Temporary ground cover/protection such as jute matting, excelsior matting, wood chips or clear plastic sheeting may be used until the permanent erosion protection is established. Seismic Based on the subsurface units mapped at the site, we interpret the structural site conditions to correspond to Site Class "C" in accordance with the 2009 IBC (international Building Code) Table 1613.5.2. This is based on the likely range of equivalent SPT (Standard Penetration Test) blow counts for the soil types observed in the site area. These conditions were assumed to be representative for the conditions based on our experience in the vicinity of the site. The City of Federal Way Municipal Code defines Seismic hazard areas are those areas subject to severe risk of earthquake damage as a result of seismically induced ground shaking, slope failure, settlement or soil liquefaction, or surface faulting. These conditions occur in areas underlain by cohesionless soils of low density usually in association with a shallow groundwater table. Based on the relative density and coarse -grained nature of the glacially derived soils observed on the site, and the low groundwater table, it is our opinion that the risk for liquefaction to occur at this site during an earthquake is negligible and does not meet the technical criteria of a seismic hazard. Recommended Buffers and Setbacks Since no active erosion, landslide, or steep slope is present on the site, no prescriptive buffer should be required by the City of Federal Way. The City of Federal Way building department may require a building setback in accordance with the IBC standard requirements. The IBC requires a building setback from slopes that are greater than 30 percent unless evaluated and reduced, and/or a structural setback is provided, by a licensed geotechnical engineer. The setback distance is calculated based on the vertical height of the slope. The typical IBC setback from the top of the slope equals one third the height of the slope while a setback from the toe of the slope equals one half the height of the slope. Site Preparation Areas to be graded should be cleared of deleterious matter including any existing structures, foundations, abandoned utility lines, debris and vegetation. The portions of the site still covered with vegetation should be stripped of any forest duff and organic -laden soils. We anticipate stripping depths of 1 to 1 'Ia feet based on test pit logs. The stripped topsoil may be stockpiled and later used for erosion control and landscaping/revegetation. Materials that cannot be used for landscaping or erosion control should be removed from the project site. Given the nature of the site soils, these soils may, or may not, be reused as structural fill provided they meet the criteria described in the "Structural Fill" section of this report. Where placement of fill material is required, the stripped/exposed subgrade areas should be compacted to a firm and unyielding surface prior to placement of any fill. We recommend that trees be removed by overturning in fill areas so that a majority of the roots are removed. Excavations for tree stump removal should be backfilled with structural fill compacted to the densities described in the "Structural Fill" section of this report. RTI, LLC, Federal Way December 20, 2012 Page 7 Any soft, loose or otherwise unsuitable areas delineated during proof -rolling or probing should be recompacted, if practical, or over -excavated and replaced with structural fill, based on the recommendations of our site representative. Structural Fill All material placed as fill associated with mass grading, such as utility trench backfill, under building areas, or under roadways should be placed as structural fill. The structural fill should be placed in horizontal lifts of appropriate thickness to allow adequate and uniform compaction of each lift. Fill should be compacted to at least 95 percent of MDD (maximum dry density as determined in accordance with ASTM ❑-1557). The appropriate lift thickness will depend on the fill characteristics and compaction equipment used. We recommend that the appropriate lift thickness be evaluated by our field representative during construction. We recommend that our representative be present during site grading activities to observe the work and perform field density tests. The suitability of material for use as structural fill will depend on the gradation and moisture content of the soil. As the amount of fines (material passing US No. 200 sieve) increases, soil becomes increasingly sensitive to small changes in moisture content and adequate compaction becomes more difficult to achieve. During wet weather, we recommend use of well -graded sand and gravel with less than 5 percent (by weight) passing the US No. 200 sieve based on that fraction passing the 3/4-inch sieve, if prolonged dry weather prevails during the earthwork and foundation installation phase of construction, higher fines content (up to 10 to 12 percent) will be acceptable. Material placed for structural fill should be free of debris, organic matter, trash and cobbles greater than 5-inches in diameter. The moisture content of the fill material should be adjusted as necessary for proper compaction. Suitability of On -Site Materials as Fill During dry weather construction, any nonorganic on -site soil may be considered for use as structural fill; provided it meets the criteria described above in the structural fill section and can be compacted as recommended. If the material is over -optimum moisture content when excavated, it will be necessary to aerate or dry the soil prior to placement as structural fill. The deeper, native soils encountered in our test pits appeared to be near their optimum moisture content. While the sandy glacial till does have high fines content, it does appear suitable for reuse as structural fill at their present moisture contents. However, these soils will be difficult or impossible to reuse during wet weather, because of their high fines contents. Any boulders or large cobbles present in these soils would need to be segregated from the matrix for certain fill applications. If fill material is imported to the site for wet weather construction, we recommend that it be a clean sand and gravel mixture, such as high quality pit run with less than 5 percent fines, or crushed rock. Foundation Support Based on the encountered subsurface soil conditions encountered across the site, we recommend that the proposed building be supported on spread footings that bear directly on the medium dense native weathered till, deeper glacial till, or on structural fill that extends to suitable native soils. The soil at the base of the excavations should be disturbed as little as possible. All loose, soft or U11SUitable material should be removed or recompacted, as appropriate. A representative from our firm should observe the foundation excavations to determine if RTI, LLC. Federal Way December 20, 2012 Page 8 suitable bearing surfaces have been prepared, particularly in the areas where the foundation will be situated on fill material. We recommend a minimum width of 2 feet for isolated footings and at least 16 inches for continuous wall footings. All footing elements should be embedded at least 18 inches below grade for frost protection. Footings founded less than 4 % to 5 feet below grade on the shallow medium dense weathered till or structural fill can be designed using an allowable soil bearing capacity of 2,500 psf (pounds per square foot) for combined dead and long-term live loads. Footings founded more than 4% to 5 feet below grade on the dense native glacial till can be designed using an allowable soil bearing capacity of 4,500 psf (pounds per square foot) for combined dead and long-term live loads. The weight of the footing and any overlying backfill may be neglected. The allowable bearing value may be increased by one-third for transient loads such as those induced by seismic events or wind loads. Lateral loads may be resisted by friction on the base of footings and floor slabs and as passive pressure on the sides of footings. We recommend that an allowable coefficient of friction of 0.40 be used to calculate friction between the concrete and the underlying soil. Passive pressure may be determined using an allowable equivalent fluid density of 350 pcf (pounds per cubic foot). Factors of safety have been applied to these values. We estimate that settlements of footings designed and constructed as recommended will be less than 1 inch, for the anticipated load conditions, with differential settlements between comparably loaded footings of/z inch or less. Most of the settlements should occur essentially as loads are being applied. However, disturbance of the foundation subgrade during construction could result in larger settlements than predicted. Floor Slab Support Slabs -on -grade, if constructed, should be supported on the medium dense native soils or on structural fill prepared as described above. We recommend that floor slabs be directly underlain by a capillary break material with minimum 6-inch thickness of coarse sand, pea gravel, or gravel containing less than 3 percent fines. The drainage material should be placed in one lift and compacted to an unyielding condition. A synthetic vapor barrier is recommended to control moisture migration through the slabs. This is of particular importance where the foundation elements are underlain by the silty sediments, or where moisture migration through the slab is an issue, such as where adhesives are used to anchor carpet or the to the slab. A subgrade modulus of 400 kcf (kips per cubic foot) may be used for floor slab design. We estimate that settlement of the floor slabs designed and constructed as recommended, will be 1/2 inch or less over a span of 50 feet. Subgradel Basement Walls Based on proposed development, we anticipate a daylight basement may be used_ The lateral pressures acting on subgrade and retaining walls (such as basement walls) will depend upon the nature and density of the soil behind the wail. It is also dependent upon the presence or absence of hydrostatic pressure. If the walls are backfilled with granular well - drained soil, the design active pressure may be taken as 35 pcf (equivalent fluid density). This design value assumes a level backslope and drained conditions as described below. The design for active pressure assumes the walls can yield 0.001 times the wall height. Stiffer walls or walls restrained from movement by diaphragms or floors should be designed to resist at -rest pressures of 50 pcf. Positive drainage which controls the development of hydrostatic pressure can be accomplished by placing a zone of coarse sand and gravel behind the walls. The granular RTI, LLC. Federal Way December 20, 2012 Page 9 drainage material should contain less than 5 percent fines. The drainage zone should extend horizontally at least 18 inches from the back of the wall. The drainage zone should also extend from the base of the wall to within 1 foot of the top of the wall. The drainage zone should be compacted to approximately 90 percent of the MDD. Over -compaction should be avoided as this can lead to excessive lateral pressures. A perforated PVC pipe with a minimum diameter of 4 inches should be placed in the drainage zone along the base of the wall to direct accumulated water to an appropriate discharge location. We recommend that a non -woven geotextile filter fabric be placed between the drainage material and the remaining wall backfili to reduce silt migration into the drainage zone. The infiltration of silt into the drainage zone can, with time, reduce the permeability of the granular material. The filter fabric should be placed such that it fully separates the drainage material and the backf€ll, and should be extended over the top of the drainage zone. A detail of this configuration can be found on Figure 7. Lateral loads may be resisted by friction on the base of footings and as passive pressure on the sides of footings and the buried portion of the wall as described in the "Foundation Support" section above. Site Drainage All ground surfaces, pavements and sidewalks at the site should be sloped away from the structure. Surface water runoff should be controlled by a system of curbs, berms, drainage swales, and or catch basins, and conveyed to an appropriate discharge point. Based on the soils encountered in our explorations, we conclude that infiltration of storm water is not feasible at the site. We understand that a underground detention vault will be utilized for stormwater control. A soil density of 130pcf can be assumed for overburden load on the vault lid. We also recommend that the townhomes be provided with a perimeter footing drain. This drain should consist of a minimum 4-inch-diameter perforated pipe within an envelope of pea gravel or washed rock, extending at least 5 inches on all sides of the pipe. The gravel envelope should be wrapped with filter fabric to reduce the migration of fines from the adjacent native soils. The drain should be installed on the native soils at the same elevation as the base of the footing. Furthermore, the roof downspouts should not connect to the footing drain. LIMITATIONS We have prepared this report for use by RTI, LLC; C.E.S. NW, Inc.; and members of the design team, for use in the design of a portion of this project. The data used in preparing this report and this report should be provided to prospective contractors for their bidding or estimating purposes only. Our report, conclusions and interpretations are based on data from others and limited site reconnaissance, and should not be construed as a warranty of the subsurface conditions. Variations in subsurface conditions are possible between the explorations and may also occur with time. A contingency for unanticipated conditions should be included in the budget and schedule. Sufficient monitoring, testing and consultation should be provided by ourfirm during construction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should the conditions revealed during the work differ from those anticipated, and to evaluate whether earthwork and foundation installation activities comply with contract plans and specifications. The scope of our services does not include services related to environmental remediation and construction safety precautions. Our recommendations are not intended to RTI, LLC. Federal Way December 20, 2012 Page 10 direct the contractor's methods, techniques, sequences or procedures, except as specifically described in our report for consideration in design. If there are any changes in the loads, grades, locations, configurations or type of facilities to be constructed, the conclusions and recommendations presented In this report may not be fully applicable. If such changes are made, we should be given the opportunity to review our recommendations and provide written modifications or verifications, as appropriate. We have appreciated the opportunity to be of service to you an this project. If you have any questions or comments, please do not hesitate to call at your earliest convenience. Respectfully submitted, GeoResources, LLC Brad O. 'Biggerstaff, LEG Principal - BPB:BI<C:rpo/rmp DoclD: RTILLC.FederalWay.GR Attachments: Figure 1 — Site vicinity Map Figure 2 — Site Plan Figure 3 — USDA SCS Sells Map Figure 4 — USGS Geologic Map Figure 5 — Soil Classification System Figure 6 —Test Pits fFigure 7 — Wall Drainage J Brian K. Callagan, PE Sr. Engineer GeoResou rces, LLC 5007 Pacific Highway East, Suite 16 Fife, Washington 98424 Phone: 253-896-1011 Fax: 253-896-2633 t� 42_ = k 5i ry ' N � i r � ^a � Thomas Bros Maps. Approximate Site Location Not to Scale Site Vicinity Map Proposed Townhomes 2245 -- South 333"' Streit Federal Way, Washington File: RTILLC.FederalWay.SVM December 2012 Figure 1 N SCALE I" = 40' A� M%K TP-1 TP 7 (4qftrA'.r 14,56 APPROXIMATE LOCATION AND NUMBER OF TEST PIT TP-1 V4aYl 5 j .j VA VY.S. W9 GeoResources, LLC 5007 Pacific Highway East, Suite 16 Fife, Washington 98424 Ph: 253-896-1011 Fax: 253-896-2633 Site and Exploration Plan Proposed Townhomes 2245 — South 333d Street Federal Way, Washington File: IRT11-1-G.1=ederalWay.SP December 2012 Figure 2 �vy!' ~r {, Gff`.• A [3' 1r...{3rY .r��•'r5323Ra�SG ', ?t' ST fAIL r, l • ,3.�} , ,r' � � SAY ,� : F , , tL try � "e,:L 1�;, , �V � �� � _ _ +' • yr. ; —�.• r ' �g ' s, _ •�.i � � � �. +1E�"":,]� , 5�. ni r `.�1 • tti�l l- � a' � , fir+ • � . ■ ■' 'i � � • l fS r I I .I 'jC{ :ems • w. T � � # LuI 4 _ -,, ,sr.r '.�; I.lf L �i }. rf,,:' -- �T�.__�. �..' _.:!�%:=�[l�J. i•: --._'aS: :ice - Approximate Site Location An excerpt from the Geologic map of the Poverty Bay 7.5-minute quadrangle, King County, Washington: U.S. Geological Survey Miscellaneous Field Studies map MF nnnn by Booth, D. B., and Waldron H. H., and Troost, K.G., 2003. Qvt Tiu--Conkpct di:tmict cOntliniug subirounded to ivell-rouaded clazts, glacially transported and deposited. Matrix is genetally silty sand to sandy silt; Liaoxidized and bard_ Generally dis- plays. as undulating upper surface; deposit is a few deters to a few tens of meters thick. Also present locally within areas maooed as unit QVi GeoResou rces, LLG 5007 Pacific Highway East, Suite 16 Fife, Washington 98424 Phone: 253-896-1011 Fax: 253-896-2633 USGS Geologic MaP Proposed Townhomes 2245 -- South 333rd Street Federal Way, Washington File: RTILLC.FederalWay.USGS Not to Scale December 2012 Figure 4 SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS GROUP SYMBOL GROUP NAME GRAVEL CLEAN GW WELL -GRADED GRAVEL, FINE TO COARSE GRAVEL GRAVEL GP POORLY -GRADED GRAVEL COARSE GRAINED More than 50% — SOILS Of Coarse Fraction GRAVEL GM SILTY GRAVEL Retained on WITH FINES No. 4 Steve GC CLAYEY GRAVEL SAND CLEAN SAND SW WELL -GRADED SAND, FINE TO COARSE SAND More than 50% Retained on SP POORLY -GRADED SAND No. 200 Sieve More than 50% Of Coarse Fraction SAND SM SILTY SAND Passes WITH FINES — No. 4 Steve SC CLAYEY SAND SILT AND CLAY INORGANIC ML SILT FINE CL CLAY GRAINED SOILS Liquid Limit Less than 50 ORGANIC OL ORGANIC SILT, ORGANIC CLAY T SILT AND CLAY INORGANIC MH SILT OF HIGH PLASTICITY, ELASTIC SILT More than 50% CH CLAY OF HIGH PLASTICITY, FAT CLAY Passes No. 200 Sieve Liquid Limit ORGANIC OH ORGANIC CLAY, ORGANIC SILT 50 or more HIGHLY ORGANIC SOILS PT PEAT SOIL MOISTURE MODIFIERS: NOTES: Field classification Is based on visual examination of soil Dry- Absence of moisture, dry to the touch 1. in general accordance with ASTM D2rE3II-90. Moist- Damp, but no visible water 2. Soil classification using laboratory tests is based on wet- Visible free water or saturated, usually soil Is ASTM D2487-90. obtained from below water table 3. Description of soil density or consistency are based on interpretation of blow count data, visual appearance of soils, and or test data. GeoResources, LLC 5007 Pacific Highway East, Suite 16 Fife, Washington 98424 Phone: 253-896-1011 Fax: 253-896-2633 USCS Soil Classification System Proposed Townhotnes 2245 — South 333"" Street Federal Way, Washington File: RTILLC.FederalWay.USCS December 2012 Figure 5 I I I I I J Test Pit TP-1 Location: At west end of proposed Storm water vault. _pth I) Soil Type Soil Descri tion 0.0 - 1.0 Sod 1 Topsoil 1.0 - 3.5 SM Brown/ orange silty SAND with occasional gravel, medium douse, moist. (W. Till) ttling, medium dense, moist. (W. Till) 3.5 - 4.8 SM Gray silty SAND with gravel, cobbles, mo 4.8 - 12.0 SM Gray silty SAND wlth gravel, cobbles, dense to very dense, moist. (Glacial Till) Test pit terminated at 12.0 feet below the ground surface. No Caving Observed Isolated minor groundwater seepage observed at 4.3 - 4.8 feet below the ground surface Test Pit TP- 2 Location: South end of parcel just east of center Depth ff Soil T e Soil Descri Lion 0.0 - Forest F 1.3 Duff 1.3 - 4.SM Forest orange silty SAND with occasional gravel, medium dense, moist. (W. Till) Brown4.0 - 5.0 SM Gray silty SAND with gravel, cobbles, mottling, medium dense, moist. (W. Till) 5.0 6.5 SM Gray silty SAND with gravel, cobbles, dense to very dense, moist. (Glacial Till) Excavated on: 4.17.2008 GeoResources, LLC 5007 Pacific Highway East, Suite 16 Fife, Washington 98424 Phone: 253-896-1011 Fax: 253-896-2633 Test pit terminated at 6.5 feet below the ground surface. No Caving Observed Minor groundwater seepage observed at 3.5 to 3.8 feet below the ground surface : MSM Test Pit Logs Proposed Townhomes 2245 — South 333rd Street Federal Way, Washington File: RTILLC.FederalWay.TP I December M2 Figure 6 Pli. 253-896-1011 Fix. 253.896-2633 RTI, LLC c/o CES NW Inc. 310-291h Street NE, Suite 101 Puyallup, WA 98372 (253) 848-4282 Attn: Mr. Steve Nelson GeoResources, LLC 5007 Pacific Hwy. E., Ste. 16 Fire, Washington 98424-2648 June 10, 2013 Geotechnical Engineering Analysis: Stormwater Infiltration Report Proposed Townhomes 2245- South 333"' Street Federal Way, Washington PN: 7978200180 Job No: RTI,LLC.S333rdSt.L This report presents the results of our geotechnical services for the proposed parking and drive lane surfaces to the proposed and existing townhomes located at 2245 South 333d Street in Federal Way, Washington. The location of the site is shown on the attached Site Vicinity Map, Figure 1. Our understanding of the project is based on our discussions with you, our experience in the project area, and our May 28, 2013 site visit. We previously prepared an updated Geotechnical Engineering Report dated December 20, 2012 for the site that included digging two test pits to depths of 0'/z to 12 feet. The City of Federal Way refers to the 2009 King County Surface Water Design Manual (KCSWDM), the Federal Way Addendum to the King County Surface Water Design Manual, the King County Stormwater Pollution Prevention Manual, and the latest edition of the LID Technical Guidance Manual for Puget Sound requirements for stormwater management. We understand that Low Impact Development (LID) systems including permeable pavement are being considered for the project. The purpose of our services was to evaluate the surface and subsurface conditions at the site as a basis for providing recommendations for addressing stormwater infiltration from the new parking and drive lane surfaces. Our scope of services for the project included the following: 1. Visiting the site and conducting a geologic reconnaissance to assess the site's soil conditions; 2. Excavating four shallow hand auger holes at selected locations; 3. Performing laboratory tests on the representative samples; and 4. Determining infiltration rates using the textural classification system. RTI,LLC.S333rdSt.L.r June 10, 2013 Page 2 The project site is located at 2245-South 333rd Street in Federal Way, Washington. The site is In an area of mixed multi -family and single-family residential development. The property boundary, existing site development, and proposed improvements are shown on the attached Site Plan, Figure 2. Portions of the area where the new parking and drive lanes will be constructed are currently used as a paved surface and previously cleared of native vegetation. The remainder of the site is covered with a combination of tall grass, small native type shrubs, and scattered young deciduous trees. No surface water or seeps were observed on the site at the time of our site visit. Subsurface conditions were evaluated by excavating four hand auger holes. The holes were excavated with a post -hole digger and a 3-inch hand auger. The near surface soils consisted of 6 to 9 inches of topsoil mantling a loose to medium dense silty fine sand with gravel. Hand Auger HA-2 encountered assorted debris (bricks, tires) within the surficial soils indicating shallow fill placement. Underlying the surficial soil, we observed light brown silty sand with gravel. Our borings generally terminated at the top of the deeper underlying dense to very dense glacial till at depths of 3 % to 4 feet below the ground surface. Evidence of a seasonal perched groundwater table as mottling was observed below depths of 21/2 to 3 feet in all four hand auger holes at the time of excavation. We performed sieve and hydrometer tests on the collected samples. Laboratory tests indicated the soils between depths of 1 to IY2 feet had Duo values of 0.0259 to 0.0142 and fines contents of 28.8 percent to 34.2 percent. The HA-3 sample had a D10 value of 0.0036 and a fines content of 41 percent. A minimum cat -ion exchange capacity of 5mg1Eq is required for water quality. The samples were processed at an outside laboratory and had Cat lon capacity levels ranging from 16.4 to 22.2 Na,mEg1100g. Organic contents ranged from'5.1 to 9.6 percent. Two EPA falling head infiltration tests were conducted and indicated field measured rates of approximately 2 inches per hour. CONCLUSIONS AND RECOMMENDATIONS Based on our site observations, and the result of our subsurface explorations and laboratory tests, onsite infiltration appears feasible within the surficial soils However, the soils in the southern portion of the site near Hand Auger HA-3 will require a higher factor of safety. Stormwater Infiltratidn Storm water infiltration rates for the weathered till soils were determined in accordance with the 2009 King County Surface Water Design Manual (KCSWDM) and Appendix C Section 2.6 for Permeable Pavement. According to the formula (1 &"19" maasuredX•Ftasg„gX Faaameuy X Fpi,,,,,,,,) an appropriate design infiltration rate would be 0.42 inches per hour. We recommend using a long term rate no high than 0.22 inches per hour because of the high fines content and limited thickness of the material. This rate should only be applied to the soils obtained from center and north portion of the site in Hand Auger Holes HAA, HA-2, and HA-4. Based on the sieve results, we recommend a higher factor of safety such as 4, for infiltration in the areas of HA-3 because of the high fines content and low Dio value. At this time we have assumed that an appreciable groundwater level will not be encountered during the course of winter monitoring. If a groundwater level is established we may need to recommend a lower design rate, or if the groundwater levels are too high, infiltration.may not be feasible at all and an alternative drainage system will need to be RTI,LLC.S333rdSt.L.r June 10, 2013 Page 3 designed. In any case we recommend that we be on site to inspect the excavated bottom of the trench to ensure that suitable soils have been exposed. Suspended solids could eventually clog the soil and reduce the infiltration rate for the proposed system. It Is critical that every effort be utilized to ensure that no fines enter the system prior to the stabilization of the site. To reduce potential clogging of the infiltration systems, the permeable pavement section should be vacuumed quarterly at a minimum. Temporary systems may be utilized through construction. We also do not recommend that topsoil or other fine grain material be placed over the native soils within the vicinity of the proposed permeable pavement sections. Periodic sweeping of the paved areas will help extend the life of the infiltration system. LIMITATIONS We have prepared this report for RTI, LLC; CES NW Inc.; and their agents for use in design and construction of the various components of this project. The data and report can be utilized for bidding or estimating purposes, but our report, conclusions and recommendations should not be construed as a warranty of the subsurface conditions, as they may vary both vertically and laterally. If there are changes in the locations or assumptions stated for this project, the conclusions and recommendations presented may not be fully applicable. if design changes are made, we should review the proposed changes to verify the applicability of our conclusions and recommendations. Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted practices in this area at the time this report was prepared. No warranty, express or implied, should be understood. QA➢ RTl,LLC.S333rdSt.L.r June 10, 2013 Page 4 We appreciate the opporturiity to be of service to you on this project. Please call if you have any questions regarding this submittal, or if we can provide additional services. Yours very truly, GeoResources, LLC a VVs, OM4U r-nqlne rl a gis ?Sed UPU" [@:A�)M P�.OIGGER�STAFF Brad P. Biggerstaff, LEG Principal BPB:DCB/rmp DocID: RTI,LLC.S333rdSt.L Attachments: Figure 1 — Site Plan Figure 2 — Soil Classification System Figure 3 — Hand Auger Logs Laboratory Analysis Dana C. Biggerstaff, P.E. Senior Geotechnical Engineer SOIL TYPE; ALDERWOOD (AgB) TOTAL BASIN AREA: GRAVELLY SANDY LOAM, 0 TO 6 36,118 SQ. FT. . PERCENT SLOPES @ EXISTING; NEX. PGIS (PUBLIC) = 5,505 SQ. FT.EX. PGIS (PRIVATE) 3,881 SQ. FT, EX. IMP SURF = 2,490 SQ. FT. PERV = 24,242 SQ. FT. I Ss Ss V) AREA TRIBUTARY TO POROUS Ln ASPHALT INFILTRATION AREA DRIVE AISLE: Z N Z = TOP OF PAVE - 374.8 PLUS/MINUS W � m Iva m P' BOTTOM OF INFILTRATION - 371.8 PLUS/MINUS EXISTING GRADE - 371 TO 373 6' I TOP OF WALL (HIGHEST) - 375 PLUS/MINUS BOTTOM OF WALL - 370 PLUS/MINUS PROPOSED DESIGN INFILTRATION: 0.44 INFILTRATION WITH FS OF 4 (0.11 IN/HR) + INFILTRATION V)AREA (578 SQ. FT) —370'—BYPASS BASIN } `�"------ I4 / JJJ.rI�JJfI VZO 'l; 11ww� a 11 1 x�x ' 1 1 11 or BASIN HA-1 ■' ���\\ Z a m f I I GRAPHIC S C ALE 30 0 10 30 q- o � J� s sn n ( IN FEET ) °�— -- �MIF i o 1 inch = 30 ft. APPROXIMATE LOCATION AND NUMBER OF HAND AUGER HA-1 w; 1 �j— I I ' � I I I I I I � 4 ` 1 I I A f I I�j I // I I I 1 ! i__ I I r I I �I I I I � I f r I I � I i v I 4 I 1 I i s I wi 7r I !.J v W m C) Z C) a V/ m W O W W G M 9fl Eg s iIA Designed: STN Drawn: STN Cheoked: CAD Scale: V = 30' Date: 2-6-13 Job No.: 12074 Sheet No.: B 2 2 of 2 Sheets SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS GRAVEL CLEAN k GRAVEL COARSE GRAINED More than 50% SOILS Of Coarse Fraction GRAVEL Retained on WITH FINES No. 4 Steve More than 50% SAND CLEAN SAND Retained on No. 200 Sieve More than 50% Of Coarse Fraction SAND Passes WITH FINES No. 4 Steve SILT AND CLAY INORGANIC FINE GRAINED SOILS Liquid Limit Less than 50 ORGANIC SILT AND CLAY INORGANIC More than 50% Passes No. 200 Sieve Liquid Limit 50 or more ORGANIC HIGHLY ORGANIC SOILS NOTES: 1. Field classification Is based on visual examination of soil in general accordance with ASTM D2488-90. 2. Soil classification using laboratory tests Is based on ASTM D2487-90. 3. Description of sail density or consistency are based on interpretation of blow count data, visual appearance of sails, and or test data. GeoResources, LLC 5007 Pacific Highway East, Suite 16 Fife, Washington 98424 Phone: 253-896-1011 Fax: 253-896-2633 GROUP GROUP NAME SYMBOL. GW WELL -GRADED GRAVEL, FINE TO COARSE GP POORLY -GRADED GRAVEL GM SILTY GRAVEL GC CLAYEY GRAVEL SW WELL -GRADED SAND, FINE TO COARSE SAND SP POORLY -GRADED SAND SM SILTY SAND Sc CLAYEY SAND MIL SILT CL CLAY OL ORGANIC SILT, ORGANIC CLAY MH SILT OF HIGH PLASTICITY, ELASTIC SILT CH CLAY OF HIGH PLASTICITY, FAT CLAY OH ORGANIC CLAY, ORGANIC SILT PT PEAT SOIL MOISTURE MODIFIERS: Dry- Absence of moisture, dry to the touch Molst- Damp, but no visible water Wet- Visible free water or saturated, usually soil Is obtained from below water table Unified Soil Classification System Proposed Residential Development 2245 S 333" Street Federal Way, Washington DocID: RTI,LLC.S333rdSt , June 2013 Hand Auger HA-1 Location: N portion of site Depth feet Soil Type Soil Description 0 -. 3/ - Sod over Topsoil 3/4 - 1 '/ SM Brown gravelly silty sand (loose to medium dense, moist) 13/ - 3%2 SM Light brown silty sand with gravel, mot[ling at basal contact (medium dense, moist) 31/ - 4 SM Gray silty sand with some gravel (dense to very dense at depth, moist) Terminated at 4 feet below ground surface. Minor caving observed in upper foot. No groundwater seepage observed. Mottling observed at 3 feet depth. Hand Auger HA-2 Location: Center of site Depth feet Soil Iyee Soil Descri tlon 0 - 1 - Topsoil with debris ( brick, tire, metal) 1 - 2 SM Brown gravelly silty sand (loose to medium dense, moist) 2 - 4 SM Light brown silty sand with gravel, mottling at basal contact (medium dense, moist) 4 - 4'/4 SM Gray silty sand with some gravel (dense to very dense at depth, moist) Terminated at 4'/a feet below ground surface. Minor caving observed in upper foot. No groundwater seepage observed. Mottling observed at 3 feet depth. Hand Auger HA-3 Location: SW portion of site Denth feet soil Type Sol] Descri tion — 0 - 1/ - Topsoil 1% - 2 SM Brown sandy silt with gravel (loose to medium dense, moist) 2 - 3 % SM Light brown silty sand with gravel, mottling at basal contact (medium dense, moist) 3 / - + SM Gray silty sand with some gravel (dense to very dense at depth, moist) Terminated at 3YA feet below ground surface. No caving observed. No groundwater seepage observed. Mottling observed at 3 feet depth. Logged by: R. M. Phillips GeoResources, LLC 5007 Pacific Highway East, Suite 16 Fife, Washington 98424 Phone: 253-896-1011 Fax: 253-896-2633 Excavated on: May 28, 2013 Hand Auger Logs Proposed Residential Development 2245 S 333rd Street Federal Way, Washington JOB# RTI,LLC.S333rdSt.HA June 2013 ' Figure 3a Hared Auger HA-4 Location: N-center portion of site oOptli (feet) Soil Tvpe Soil Description O - a/+ - Sod over Topsoil 9/a - 1'/2 SM Brown gravelly silty sand [loose to medium dense, moist] 1'/z - 3%2 SM fight brown silty sand with gravel, mottling at basal contact (medium dense, moist) 31/ - + SM Gray silty sand with some gravel (dense to very dense at depth, moist) Terminated at 3%feet below ground surface. Minor caving observed in upper foot. No groundwater seepage observed. Mottling observed at 3 feet depth. Logged by: R. M. Phillips GeoResources, LLC 5007 Pacific Highway East, Suite 16 Fife, Washington 98424 Phone: 253-896-1011 Fax: 253-896-2633 Excavated on: May 28, 2013 Hand Auger Logs Proposed Residential Development 2245 S 333`d Street Federal Way, Washington JOB# RTI,LLC.S333rdSt.HA i June 2013 1 Figure 3b 0Y W Z lL F- Z w U w a- L E F- [a a) a� L C a m 0 ry a� r (D w 0 0 L W 3 0 sa c � v 0 m � 0 m o -cis N � ��D U � x W m CD E L (� I Particle Size Distribution Report GRAIN SIZE - mm. % Gravel % Sand *3 Coarse Flne Coarse Medium J Fine 0.0 17.3 1 17.3 7.7 1 10.4 15.1 SIEVE SIZE PERCENT FINER SPEC." PERCENT PASS? (X=NO) 1.25 100.0 .5 74.2 .3125 71.4 #4 65.4 #10 57.7 #20 51.7 #40 47.3 #60 42.6 #100 37.5 #200 32.2 0 10 20 30 40 50 60 70 80 90 100 % Finos 24.4 1 7.8 Material Description Afterbera Llmlts PL= LL= P1= Coefficlents D85= 20,5598 D60= 2.7357 D50= 0.6456 Dg6= 0.0689 ❑15= 0.0247 1310= 0.0142 Cu= 192.02 Cc= 0. €2 Classification USCS= AASHTC= Remarks F.M: 3.35 `m (nospeoificattonproviaea) IR c o Sample Number: 090358 Depth: 14-19"Co Date: cn — Location: HA-1 GeoResources, LLC Client: RTI,LLC Project: Proposed Porous Pavement a) U) of CD � Fife Wl4 Prn ect Na: 1tT1.s333rd Figure Tested By: MWS — Checked By: RMP a a) L Z LL z w U w iL 1 Particle Size Distribution Report 0 10 20 30 40 50 60 70 80 90 100 17i11`711Y V1LL- 1111 i1• % Gravel _ % Sand % Fines %+31� Coarse Fine Coarse Medium Fine Silt cla 0.0 0.0 30.2 8.9 12.0 20.1 28.8 SIEVE SIZE PERCENT FINER SPEC.* PERCENT PASS? (X=NO) .75 100.0 .5 85.0 .3125 81.0 #4 69.8 #10 60.9 #20 55.0 #40 48.9 #60 42.0 #100 35.4 #200 28.8 Material Oescri tlon tterberq Limits PL= LL= Pl= Coeffici nts D85= 12.7300 D60= 1.7100 D50= 0.4713 D--- 0.0796 D15= 0.0408 D10= 0.0259 Ce 66.13 Cc= 0.14 Classification USCS= AASHTO= Remarks F.M. 2.96 (no specification provided) Sample Number: 090359 Depth: 12-15" Location: HA-2 GeoResources, LLC Client: RTI,LLC Project: Proposed Porous Pavement Fife, WA Project No: RTI.S333rd Tested By: _ Checked By: Date: Tested By: mws Checked By: rmp CY W z ii a. 1 Particle Size Distribution Report 0 10 20 30 -a m 40 n m Z 60 C] Q 60 M 70 80 90 100 GRAIN SIZE - mm. % Grav61 % Sand % Fines +3" Coarse I Fine Coarse Medium Fine Sift Cla' 0.0 0.0 1 24.0 1 14.0 1 11.4 16.4 34.2 SIEVE SIZE PERCENT FINER SPEC.* PERCENT PASS? (X=NO) .75 100.0 .5 92.9 .3125 89.9 #4 76.0 #10 62.0 #20 55.0 #40 50.6 #60 45.9 #100 40.4 #200 34.2 Material Description Atterbera Limits PL= LL= PI= Coefficients D85= 6.4191 D60= 1.6096 D50= 0.3897 D56= 0.0666 D15= 0.0403 D10= 0.0143 Cu= 112.32 C&= 0.19 Classification USCS= AASHTO= Remar s F.M. 2.70 - (no specification provided) Sample Number: 090360 Depth: 12-18" Location: HAS Date: GeoResources, LLC client: RTI,LLC Project: Proposed Porous Pavement Fife, WA Project No: RTI.S333rd F€ ure Tested By: _MWS Checked By: RMP SPECTRA. Laboratories 2221 Ross Way " Tacoma, WA 98421 0 (253) 272-4850 8 Fax (253) 572.9838 • www.spectra-lab.com 06/13/2013 Goo Resources, LLC Project: RTI 333 Rd St Fed Way 5007 Pacific Hwy. E Sample Matrix: Solid Suite 16 Date Sampled: 05/28/2013 Fife, WA 98424 Date Received: 05/29/2013 Spectra Project: 2013050639 Client ID Spectra # Analyte Result Units Method 11A-1 14"-19" 1 Organic Content 7.2 W/O ASTM D-482 HA-1 14"-19" 1 Cation Exchange Capacity 22.2 Na, mEq/ 100g SW846 9081 HA.-212"-15" 2 Organic Content 6.6 wt.% ASTM D-482 HA-2 12"-15" 2 Cation Exchange Capacity 18.9 No, mEq/ 100g SW846 9081 HA-3 6"-12" 3 Organic Content 9.6 wt % ASTM D-482 HA 3 6"-12" 3 Cation a-changeCapacity 19.2 Na,n1Eq/ 100g SW846 9081 HA-4 12"-18" 4 Organic Content 5-1 wt.% ASTM D482 HA-4 12"-18" 4 Cation Exchange Capacity 16A Na, mtq/ 100g SW846 9081 SPECTRA LABORATORIES Steve Hibbs, Laboratory Manager a7hsh Page 9 of 9