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12-105336
CITY OF CITY HALL Federal Way 33325 8th Avenue Smth Federal Way, WA 98003-6325 (253) 835-7000 www.cityoffederaA,vay.com January 10, 2013 Brian Roberts City of Federal Way - PW 33325 8"' Avenue South Federal Way, WA 98003 RE: File #12-105336-00-SE; ENVIRONMENTAL THRESHOLD DETERMINATION South 320`6 Street @ 20th Avenue South Intersection Improvements, Federal Way Dear Mr. Roberts: City staff has reviewed the environmental checklist you submitted. We have determined that the proposal will not have a probable significant adverse impact on the environment. As a result, an Environmental Impact Statement (EIS) is not required to comply with the State Environmental Policy Act (SEPA). A 14-day comment period is required by the SEPA rules (WAC 197-11-340). A notice inviting comments will be published in the Federal Way Mirror on January 11, 2013. At the end of the comment period, the department will decide whether the Determination of Nonsignificance (DNS) should be withdrawn, modified, or issued as proposed. All final determinations may be appealed within 14 days following the comment deadline. No licenses, permits, or approvals will be issued until completion of the appeal period. The decision not to require an EIS does not grant the license, permit, or approval you are seeking from the city. The environmental record is considered by the decision maker(s) and conditions may be imposed to reduce identified environmental impacts, as long as the conditions are based on adopted and designated city policy. After a final decision has been made on your proposal, you may, but are not required to, publish a Notice of Action as set forth in RCW 43.21C.075. The Notice of Action sets forth a time period after which no legal challenges regarding the proposal's compliance with SEPA can be made. A copy of the Notice of Action form and copies of RCW 43.21C.080 and WAC 197-11-680 providing instructions for giving this notice are available from the Department of Community and Economic Development. The city is not responsible for publishing the Notice of Action. However, the city is responsible for giving a notice to parties of record stating the date for any judicial appeal (including the SEPA portion of that appeal) if your proposal is one for which the city's action contains a specified time period within any court appeals must be made. If you need further assistance, please contact Assistant Planner Becky Chapin at 253-835-2641 or rebecca.chapin@cityoffederalway.com. Sincerely, C� Isaac Conlen Planning Division Manager for Patrick Doherty, Director ene: DNS Doe. CD. 62868 -4 CITY OF ✓ Federal Way ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE SOUTH 320TH STREET @ 20TH AVENUE SOUTH INTERSECTION IMPROVEMENTS FEDERAL WAY FILE NO: 12-105336-00-SE Proposal: Proposed project includes widening South 320'h Street for an additional left -turn lane eastbound and westbound. Improvements include the installation of new curb, gutters, sidewalk, and a stormwater treatment system along 20'h Avenue South. Applicant: Brian Roberts, City of Federal Way Public Works, 33325 8`h Avenue S, Federal Way Location: S 320th Street @ 20th Ave S right-of-way, Federal Way Lead Agency: City of Federal Way Community and Economic Development Department Staff Contact: Becky Chapin, Assistant Planner, 253-835-2641 The Responsible Official of the City of Federal Way hereby makes the following threshold determination based upon impacts identified in the Environmental Checklist; Federal Way Comprehensive Plan; and other policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the State Environmental Policy Act Rules pursuant to RCW 43.21C.060. The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.2 1 C.03 2(2)(c). This decision was made after review of a completed environmental checklist, engineering permit application, and other information on file with the lead agency. The project file is available for review during normal business hours at the Permit Center located on the second floor of City Hall. This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on January 25, 2013. Unless modified by the City, this determination will become final following the above comment deadline. Any person aggrieved of the City's final determination may file an appeal with the Federal Way City Clerk (address below), no later than February 9, 2013. Any person appealing the decision should be prepared to make specific factual objections. Responsible Official: Isaac Conlen, Planning Manager, for Patrick Doherty, Director of Community and Economic Development Address: 33325 8`h Avenue South, Federal Way, WA 98003 Date Issued: January 10, 2013 Signature: Doc I D 62867 CITY OF '• Federal Way NOTICE OF ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE (DNS) South 320fh Street @ 20th Avenue South Intersection Improvements Federal Way File No: 12-105336-00-SE Proposal: Proposed project includes widening South 320"' Street for an additional left -turn lane eas oundan( bound. Improvements include Tie mstalTation ot new curb, gutters, sidewalk, and a stormwater treatment system along 2& Avenue South. Applicant: Brian Roberts, City of Federal Way Public Works, 33325 8t' Avenue S, Federal Way Location: S 320th Street @ 20t' Ave S right-of-way, Federal Way Lead Agency: City of Federal Way Community and Economic Development Department Staff Contact: Becky Chapin, Assistant Planner, 253-835-2641 The Responsible Official of the City of Federal Way hereby makes the following threshold determination based upon impacts identified in the Environmental Checklist; Federal Way Comprehensive Plan; and other policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the State Environmental Policy Act Rules pursuant to RCW 43.21 C.060. The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.2 1 C.032(2)(c). This decision was made after review of a completed environmental checklist, Engineering permit application, and other information on file with the lead agency. The project file is available for review during normal business hours at the Permit Center located on the second floor of City Hall. This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on January 25, 2013. Vicinity Map tL-Z Pmiect Area L) E3 Unless modified by the City, this determination will become final following the above comment deadline. Any person aggrieved ofthe City's final determination may file an appeal with the Federal Way City Clerk (33325 8t' Avenue South, Federal Way, WA 98003), no later than February 8, 2013. Any person appealing the decision should be prepared to make specific factual objections. Printed in the Federal Way Mirror on January 11, 2013. Doc, I D. 61592 Federal Way NOTICE OF ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE (DNS) South 320tb Street @ 201b Avenue South Intersection Improvements Federal Way File No,12-105336.00•SE Proposal:Proposed project includes widening South 3201h Street for an additional left -lure lane eastbound and westbound. Improvements include the installation at nevi curb, gutters, sidewalk. and a slorm%vater treatment system along 20th Avenue South. Appllcanl: Brian Roberts, City of Federal Way Pub- lic Works, 33325 $th Avenue S, Federal Way Locafion:S 320th Street 0 20th Ave S right-of- way, Federal Way Lead Agency: City of Federal Way Community and Economic Development Department 5taffConfact: Becky Chapin, Assistant Planner, 253-835-2641 The Responsible Official of the City of Federal Way hereby makes the following threshold determina- tion based upon impacts identified in the Environ- mental Checklist: Federal Way Comprehensive Plan-, and other policies, plans, rules, and regula- tions designated as a basis for exercise of substan- tive authority under the State Environmental Policy Act Rules pursuant to RCW 43.21 C.060. The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not re- quired under RCW 43.21C.032(2){c). This decision was made after review of a completed environmen- tal checklist, Engineering permit application, and other Information on file with the lead agency. The project file is available for reviewv during normal business hours at the Permit Center located on the second floor of City Hall. This DNS is issued under Washington Administra- tive Code (WAG) 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on January 25, 2013, unless modified by the City, this determination will become final following the above comment dead- line. Any person aggrieved of the City's final deter- mmalion may file an appeal with the Federal Way City Clerk (33325 0 Avenue South, Federal Way, WA 98003), no later than February 8, 2013. Any person appealing the decision should be prepared to make Specific factual objections. Printed in the Federal Way Mirror on January 11, 2013- FWM 1966 3 1 9 1 9 1 "Ave S, Suite 101 1 Federal, Way, WA 98003 1253.925.5565 1253.925.5750 (f) Affidavit of Publication Rudi Alcott, being first duly sworn on oath, deposes and says that he is the Publisher of The Federal Way Mirror, a weekly newspaper. That said newspaper is published in the English language continually as a weekly newspaper in Federal Way, King County, Washington, and is now and during all of said time has been printed in an office maintained by the aforementioned place of publication of said newspaper. That the annexed is a true copy of a legal advertisement placed by City of Federal Way - Community Development as it was published in regular issues (and not in supplemental form) of said newspaper once each week for a period of one consecutive weeks(s), commencing on the 1 1 th day of January 201 3, and ending on the 1 1 th day of .Januca 2013, both dates inclusive, and that Such newspaper was regularly distributed to its readers during all of said period. That the full amount of the fee charged for the foregoing publication is the SLIM of $103.82, which amount has been paid in full, or billed at the legal rate according to RCW 65. 16.020. Subscribed to and sworn before me this 1 st day of February 2013. Notary Public in and for the State of Washington, Residing at Federal Way 41k CITY Federale. Way DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES 33325 8th Avenue South Federal Way WA 98003 253-835-7000; Fax 253-835-2609 www.ciiyoffederalway.com DECLARATION OF DISTRIBUTION -a x % � hereby declare, under penalty of perjury of the laws of the State of Washington, that a: ❑ Notice of Land Use Application/Action ❑ Notice of Determination of Significance (DS) and Scoping Notice T Notice of Environmental Determination of Nonsignificance (SEPA, DNS) ❑ Notice of Mitigated Environmental Determination of Nonsignificance (SEPA, MDNS) ❑ Notice of Land Use Application & Optional DNS/MDNS ❑ FWRC Interpretation ❑ Other ❑ Land Use Decision Letter ❑ Notice of Public Hearing before the Hearing Examiner ❑ Notice of Planning Commission Public Hearing ❑ Notice of LUTC/CC Public Hearing ❑ Notice of Application for Shoreline Management Permit ❑ Shoreline Management Permit ❑ Adoption of Existing Environmental Document was IKmailed ❑ faxed ❑ e-mailed and/or ❑ posted to or at each of the attached addresses on viol Project Name S 2 U File Number(s) ) :) "l 0 Signature -0-5Date _ i '%d '6 - K:\CD Administration Files\Declaration of Disiribution.doc/Last printed 1 /12/2012 2:20:00 PM CITY OF Federal Way NOTICE OF ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE (DNS) South 320`h Street @ 20'h Avenue South Intersection Improvements Federal Way File No: 12-105336-00-SE Proposal: Proposed project includes widening South 320`h Street for an additional left -turn lane _ �eastoun —and we oun mprovemenfs me u e the installiTtion &f new curb, gutters, sidewalk, and a stormwater treatment system along 20t' Avenue South. Applicant: Brian Roberts, City of Federal Way Public Works, 33325 8`h Avenue S, Federal Way Location: S 320t` Street @ 20t' Ave S right-of-way, Federal Way Lead Agency: City of Federal Way Community and Economic Development Department Staff Contact: Becky Chapin, Assistant Planner, 253-835-2641 The Responsible Official of the City of Federal Way hereby makes the following threshold determination based upon impacts identified in the Environmental Checklist; Federal Way Comprehensive Plan; and other policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the State Environmental Policy Act Rules pursuant to RCW 43.21 C.060. The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.21C.032(2)(c). This decision was made after review of a completed environmental checklist, Engineering permit application, and other information on file with the lead agency. The project file is available for review during normal business hours at the Permit Center located on the second floor of City Hall. This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on January 25, 2013. �.. � Pmiect Area Vicinity Map Unless modified by the City, this determination will become final following the above comment deadline. Any person aggrieved of the City's final determination may file an appeal with the Federal Way City Clerk (33325 8`h Avenue South, Federal Way, WA 98003), no later than February 8, 20I3. Any person appealing the decision should be prepared to make specific factual objections. Printed in the Federal Way Mirror on January 11, 2013. 9G` Doc, 1 D 61592 I Map Date: January, 2013 City of 300' Notification ArLLI for RO,Box9718y of Way Gis Division P.O, Box 9718 tl Federal WayS 320 St @ 20 Ave S (206) B3Ave 0 Federal Way Wa, 98063 (206) - 835 - 7000 www. ci tyoffed era Tway -co m i i 092104-9118 092104-9304 092104-9241 092104-9146 092104-9292 R r— S 0921a4-WM 092104-9208 c 092104-9291 Tr#n'sit C n to r 092104-9034 092104-9298 092104-9221 SeaTac LL Villa.' e E5092104-9207 s-320TH-,s-T =-- - - -_- ---i 762240- 162104-9041i — 0012 242320-0050 A r Palmdo World,�u p po ryG N N Plaza o ¢ S 092104•rJJCT Q N 3 8 092104-fi270 g n 2ri N - - 242320-0040 �a7{y��9 T— N N Cn C4 _-- s-MOT- _'G'�fr ST - -I-i - . L0013 76- 2240-0026 —Y 762240-0010 rS � r` 762240-0018 j � I IJ II f N The Commons at Federal Way N , I L-, 762240-0025 — � 7622404011 i- LIJ 0 ry 324xH ST — —.. -- - 7627.•1C-�^.-21 o 0 o d 162104- � � � � m v 9049 > c' 0 o g g g o Q N N N O N p O - N N N O O N A c7 N LEI); ��'., g cp g 162104-9037 162104- 4 0 v 9042 2 N N c, N ro � �, ID 0o�g S 325TH ST a N `� N — d2iO4.9159 162104-9052 162104-9023 Legend n CITY OF Project Area N v Federal Way Parcels Notified 0 150 300 This map is intended for use as a graphical representation only. King County Tax Parcels MMMMMMC=== Feet The City of Federal Way makes no warranty as to its accuracy. -L CD 0 Ul W N O CO J 0) Vl A w N y J J J J J J J CD O Cl O CD CD CD(ONCif N ON � 01 O� ON O\ ON N 110 110 �o IC � N N N N. N N N, N? A 4 A C) O O O O O O O O O O O CD O CDy��� y 0 0 0 0 0 0 0 N N N N N O N — — — (] �D �o -1 --ACDN 77XCC O 0 Q .� ON ON (.A -Alw N O y J (ON 00 O CO) X rt m °a O ITI H y v� y o Z n7d x ">>>> -� n�d�d r [ � H-3-3 rn y 0 Z Cry v� o Z Cr] rn y 0 n cn o Cry n a b7 m O tin H cn n zm 2 to O M � n zz�> m m n O m E Y r c� O z d DD X m z D r � a nDa a D 9 Off mop w----I Z a O n -3 n> r �p O O O O y Z UJ p ra p O m ZZ� m z r A n � b v 00 7� 10 O O � b yDb3 C O Z w d w O O O N 0000 w== 0000 w N N "' Cn cn a] C O O O 70 x 0 o o o o w rn tx `b � C tom" C7 o - � 00 Cris r o 00 C Z z z a m `nc �CAcncnw Y CA aIt rr CJ m m b 00 X d b H -gym x�-71-t� m CA mob dd °dddd ° y d�°Doa oz mm -r,mmmmm > 0 z o ot)dZ m���� d > d�11 DC .o w � o`Oo m a 00 >1N O a s � a a a 0 00O N 0 N 00 �o c �o 00 0O 00 w w ,00 C>C �ooC)� 0 o C" o 0 0 0 -� W o 0 0 0 0 0 r �o -h C� a � x w � N O a./ W N 7 C. am Z y Z O N c jw a (D Q. o 0 a A) 3 (Q• W CL N (D y 4 CITY OF Federal Way DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT 33325 8th Avenue South Federal Way WA 98003 253-835-7000; Fax 253-835-2609 www. c i tyo ff e d e ral woy_co m DECLARATION OF DISTRIBUTION 1, _` r„ It), .',p- hereby declare, under penalty of perjury of the laws of the State of Washington, that a: ❑ Notice of Land Use Application/Action ❑ Notice of Determination of Significance (DS) and Scoping Notice ❑ Notice of Environmental Determination of Nonsignificance (SEPA, DNS) itigated Environmental Determination of Nonsignificance (SEPA, MDNS) ❑ Notice of Land Use Application & Optional DNS/MDNS ❑ FWRC Interpretation ❑ Other ❑ Land Use Decision Letter ❑ Notice of Public Hearing before the Hearing Examiner ❑ Notice of Planning Commission Public Hearing ❑ Notice of LUTC/CC Public Hearing ❑ Notice of Application for Shoreline Management Permit ❑ Shoreline Management Permit ❑ Adoption of Existing Environmental Document was ),mailed ❑ faxed lie -mailed and/or ❑ posted to or at each of the attached addresses on _D 2013. Project Name —_S � Q File Number(s) ) a � Signature !7� f�; , Date K:\CD Administration Files\Declaration of Distribution.doc/Last printed 1 /10/2013 11:39:00 AM z _1 CITY OF Federal Way ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE SOUTH 320T" STREET @ 20TH AVENUE SOUTH INTERSECTION IMPROVEMENTS FEDERAL WAY FILE NO: 12-105336-00-SE Proposal: Proposed project includes widening South 320`h Street for an additional left -turn lane eastbound and westbound. Improvements include the installation of new curb, gutters, sidewalk, and a stormwater treatment system along 20`h Avenue South. Applicant: Brian Roberts, City of Federal Way Public Works, 33325 8`h Avenue S, Federal Way Location: S 320`h Street @ 20'h Ave S right-of-way, Federal Way Lead Agency: City of Federal Way Community and Economic Development Department Staff Contact: Becky Chapin, Assistant Planner, 253-835-2641 The Responsible Official of the City of Federal Way hereby makes the following threshold determination based upon impacts identified in the Environmental Checklist; Federal Way Comprehensive Plan; and other policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the State Environmental Policy Act Rules pursuant to RCW 43.21C.060. The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.2 1 C.032(2)(c). This decision was made after review of a completed environmental checklist, engineering permit application, and other information on file with the lead agency. The project file is available for review during normal business hours at the Permit Center located on the second floor of City Hall. This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on January 25, 2013. Unless modified by the City, this determination will become final following the above comment deadline. Any person aggrieved of the City's final determination may file an appeal with the Federal Way City Clerk (address below), no later than February 9, 2013. Any person appealing the decision should be prepared to make specific factual objections. Responsible Official: Isaac Conlen, Planning Manager, for Patrick Doherty, Director of Community and Economic Development Address: 33325 8`h Avenue South, Federal Way, WA 98003 Date Issued:. January 10 2013 Signature: Doc I D. 62867 DNS & Checklist to the following angencies: DEPT OF ECOLOGY ENVIRONMENTAL REVIEW SEC PO BOX 47703 OLYMPIA WA 98504-7703 sepaunit@ecy.wa.gov MUCKLESHOOT INDIAN TRIBE PUYALLUP TRIBE OF INDIANS RAMON PAZOOKI ATTN ENVIRONMENTAL REVIEWER ATTN ENVIRRNMENTAL REVIWER WSDOT SOUTH KING COUNTY 39015 172ND AVE SE 3009 E PORTLAND AVE PO BOX 330310 AUBURN WA 98092 TACOMA WA 98404 SEATTLE WA 98133-9710 DNS Only: BRIAN ASBURY LAKEHAVEN UTILITY DIST PO BOX 4249 FEDERAL WAY WA 98063 basbury@lakehaven.org SOUTH KING FIRE & RESCUE 31617 1 ST AVE S FEDERAL WAY WA 98003 info@southkingfire.org Tamara Fix From: Tamara Fix Sent: Thursday, January 10, 2013 3:08 PM To: 'ECY RE SEPA UNIT' Cc: Gordon Goodsell; 'basbury@lakehaven.org' Subject: S 320th @ 20th Ave S DNS Attachments: S 320th DOE pkt.pdf Attached is the DNS and Annotated Checklist for the S 320th St @ 20th Ave S Intersection Improvements project in the City of Federal Way. This is being issued on January 11, 2013, and the Assistant Planner for the project is Becky Chapin, 253-835-2641, rebecca.chapinOcityoffederalway.com. 41k CIT Federal Way DEPARTMENT OF CommuNm DEVELOPMENT SERVICES 33325 8`h Avenue South PO Box 9718 Federal Way WA 98063-9718 253-835-2607;Fax 253-835-2609 www.ci tvof federalway.com ENVIRONMENTAL CHECKLIST - PURPOSE OF CHECKLIST The State Environmental Policy Act (SEPA), RCW Chapter 43.21C, requires all governmental agencies to consider the environmental impacts of a proposal before making decisions. An environmental impact statement (EIS) must be prepared for all proposals with probable significant adverse impacts on the quality of the environment. The purpose of this checklist is to provide information to help you and the agency identify impacts from your proposal (and to reduce or avoid impacts from the proposal, if it can be done) and to help the agency decide whether an EIS is required. INSTRUCTIONS FOR APPLICANTS This environmental checklist asks you to describe some basic information about your proposal. Governmental agencies use this checklist to determine whether the environmental impacts of your proposal are significant, requiring preparation of an EIS. Answer the questions briefly, with the most precise information known, or give the best description you can. You must answer each question accurately and carefully, to the best of your knowledge. In most cases, you should be able to answer the questions from your own observations or project plans without the need to hire experts. If you really do not know the answer, or if a question does not apply to your proposal, write "do not know" or "does not apply." Complete answers to the.questions now may avoid unnecessary delays later. Some questions ask about governmental regulations, such as zoning, shoreline, and landmark designations. Answer these questions if you can. If you have problems, the governmental agencies can assist you. The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of time or on different parcels of land. Attach any additional information that will help describe your proposal or its environmental effects. The agency to which you submit this checklist may ask you to explain your answers or provide additional information reasonably related to determining if there maybe significant adverse impact. USE OF CHECKLIST FOR NON -PROJECT PROPOSALS Complete this checklist for non -project proposals, even though questions may be answered "does not apply." In addition, complete the Supplemental Sheet for Non -Project Actions (part D). For non -project actions, the references in the checklist to the words "project," "applicant," and "property or site" should be read as "proposal," "proposer," and "affected geographic area," respect CEIVED NOV 2 6 2012 Bulletin #050 — August 19, 2004 Page 1 of 16 k:�Handouts\Envirqmwtal Checklist A. BACKGROUND 1. Name of proposed project, if applicable: City of Federal Way South 320th Street at 20th Avenue South Intersection Improvements 2. Name of applicant: City of Federal Way Public Works Department 3. Address and phone number of applicant and contact person: Applicant. - City of Federal Way Public Works Department, 33325 8th Avenue S - Federal Way, Washington 98003 Contact person: Brian Roberts, PE 253.835.2723 brian.roberts@cityoffederalway.com 4. Date checklist prepared: September 2012 5. Agency requesting checklist: City of Federal Way 6. Proposed timing or schedule (including phasing, if applicable): The project is currently scheduled to begin construction in April 2013, with construction completed by the end of 2013. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. None are known. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. No environmental information has been prepared or will be prepared for this project, which will improve an existing roadway intersection. fir}- Croce 0rtf+ 1 etz11 C+\Y `CAL4 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. None are known. Bulletin #050 — August 19, 2004 Page 2 of 16 k:\Handouts\Environmental Checklist 10. List any government approvals or permits that will be needed for your proposal, if known. SEPA Checklist and Determination National Pollutant Discharge Elimination (NPDES) Construction Stormwater General Permit City of Federal Way Clearing and Grading Permit — E 4 yte "I K.Cl P&—rTvkxk -6-cl 11. Give a brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. The South 320th Street at 20th Avenue South intersection improvements project includes the following elements. • Widening South 320th Street to provide an additional 11 foot -wide left -turn lane in both the eastbound and westbound directions at the intersection of South 320th Street with 20th Avenue South; • Removal of existing and installation of new curb and gutter and sidewalk; • Installation of a stormwater treatment system along the north leg of 20th Avenue South; and • Providing channelization realignment within the north leg of20th Avenue South. The project extends approximately 1, 000 linear feet along South 320th Street and approximately 1,200 feet north and 200 feet south on 20th Avenue and encompasses approximately 14,695 square feet (sq. ft.). Road widening will be accomplished by extending the South 320th Street traveled way to the south, where the City of Federal Way (City) has agreements in place with adjacentproperty owners. To accommodate this widening, the existing sidewalks and bus stop, landscaping, retaining walls, and illumination system along the south side of the roadway will be replaced. All existing curb ramps and traffic signals will be replaced throughout the intersection. The existing stormwater management system throughout the project site will be upgraded to meet current City standards, including stormwater improvements on 20th Avenue South north of the proposed road work. Existingfranchise utilities located within the project site will need to be relocated or adjusted to accommodate the proposed improvements. Private parking lots on the south side of South 320th Street will be reconfigured to accommodate the road widening. Existing sign structures will be relocated and banner poles will be installed at three locations to accommodate seasonal banners across South 320th Street. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address if any, and section, township, and range if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The proposed project is located in the downtown corridor of federal Way, Washington, approximately 112 mile west of Interstate 5 (I-5) along South 320th Street at 20th Avenue and just north of The Commons at Federal Way shopping mall. The site is located in the northwest corner of Section 16 and southwest corner of Section 9, Township 21 N, Range 4E W M. (47.18504 NLatitude /-122.18315 99 (Drawing G-2). Bulletin #050 — August 19, 2004 Page 3 of 16 k_\Handouts\Environmental Checklist B. ENVIRONMENTAL ELEMENTS 1. EARTH a. General description of the site (circle one). Fiat, Bing, hilly, steep slopes, mountainous, other. b. What is the steepest slope on the site (approximate percent slope)? The project site is located within a regional depression but is nearly flat. The surrounding area can be described as gently rolling hills with slopes ranging from I to 6 percent. c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, mulch)? you know the classification of agricultural soils, specify them and note any prime farmland. Hart Crowser conducted a soils investigation of the project site, and a copy of its February 2012 draft geotechnical design study is attached to this checklist'Stte soils werefound to consist offill deposits ranging from 4 to 10 feet in depth over a native silt, sand, and gravel soil layer. Native soils are made up of layers of stiff to very stiff silt with a variable sand content and medium dense to very dense sand and gravel with variable silt content. The City indicates that the south side of 320th Street was historically a peat bog. The soils map for King County identifies map unit EwC in this locution, comprised of Everett-Alderwood gravelly sandy loams, 6 to 15 percent slopes. 4t G.eO�echr►,'c,-t sr�d vn �[a. wifK -1-- [° �" —4A- d. Are there surface indications r history of unstable soils in the4nrnediate vicinity? If so, describe. The City's critical areas map does not show unstable soils (e.g., landslide or erosion hazard areas) within the project area or vicinity. The site is devoted entirely to developed roadways, sidewalks, and landscaping areas and shows no signs of unstable soils. The Hart Crowser draft geotechnical engineering design study indicates that soils within the project site consist offill over native silt, sand, and gravel. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. The proposed improvements will require the excavation of approximately 1, 600 cubic yards of existing roadway fill that will be hauled to an appropriate disposal site. Approximately 2, 000 tons of imported ballast, gravel pipe bedding, and base course will be placed in layers and compacted consistent with standard fill placement practices. Compaction will be accomplished using typical construction methods, such as a roller -compactor or a backhoe-mounted vibratory plate. The ballast and base course will be imported from a commercial materials supplier. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Construction of the project will involve removing existing pavement and landscaping which will expose soil and earth to erosion forces. Approximately 46, 936 sq. ft. of soil may be exposed during construction. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The project area is currently 84.5 percent impervious surfaces, which consist of 2.43 acres of pollution -generating impervious surfaces and 0.39 acre of nonpollution generating impervious surfaces. Following construction, impervious surfaces will be increased by 0.035 acre (1,449 sq. ft.). The area ofpollution generating surface will be increased by 0.07 acres (2,931 sq. f). Bulletin #050 — August 19, 2004 Page 4 of 16 k_\Handouts\Environmental Checklist h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any.. Various erosion control best management practices (BMPs) will be implemented prior to and during construction to reduce the potential for erosion to occur as a result of the proposed project activities. These BtALPs include installation of construction fencing at the project limits, temporary and permanent surface cover, catch basin inlet protection, dust control, concrete handling, sawcutting and surface pollution prevention, and construction staging on impervious surface. In addition, construction activities would be closely coordinated to minimize the amount of soil exposed at any one time and, where possible, to retain landscape/natural vegetation. Disturbed areas will be reseeded as soon as practicable. No other types of impacts to the earth are anticipated. 2. AIR a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors, industrial wood smoke, etc.) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. During construction, truck and heavy machinery traffic and removal and placement of materials may result in some fugitive dust emissions. Additionally, construction equipment will generate hydrocarbons and diesel exhaust will be generated during construction. However, such emissions will be temporary, lasting only for the duration of construction. Fugitive dust will be minimal and localized at the point of active construction. Therefore, air quality emissions during construction will not result in a significant impact. After construction is complete, emissions from this area are anticipated to be consistent with current conditions, as the project is intended to improve safety along South 320th Street and will not generate additional trajjic. b. Are there any off -site sources of emissions or odor that may affect your proposal? If so, generally describe. The project area is located in a developed and urban area at the intersection of South 320th Street and 20th Avenue in a heavily utilized transportation corridor. I-5 is located approximately 112 mile east of the project site. While traffic from the interstate and highways is a potential source of air emissions and/or odors, the emissions or odors will not affect either the construction or use of the intersection improvements. c. Proposed measures to reduce or control emissions or other impacts to air, if any. As necessary, dust suppressants, such as periodic watering will be used to minimize particulate emissions during construction. Equipment not in use will be shut off, and all trucks transporting materials capable ofproducing fugitive dust will use appropriate covers. Trucks transporting construction equipment and materials during construction will use mufflers and emission control equipment consistent with federal, state, and local standards. Bulletin #050 — August 19, 2004 Page 5 of 16 kMandouts\Environmental Checklist WATER a. Surface 1) Is there any surface water body on or in the immediate vicinity of the site (including year- round and seasonal streams, saltwater, lakes, ponds, and wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. The project site is located within the Hylebos Creek drainage basin but there are no surface water bodies on or in the immediate vicinity of the project site. Puget Sound is located approximately 2-112 miles to the northwest of the project site. Several lakes (Steel Lake, Mirror Lake, Easter Lake, and Fisher's Pond) are located I to 2 miles north and west of the project site, but are outside the affected area. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. The project will not require any work over, in, or adjacent to (within 200 feet) of a water body. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected Indicate the source of fill material. Fill or dredge material will not be placed in or removed from surface water or wetlands. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. The proposal will not require surface water withdrawals or diversions. 5) Does the proposal lie within a 100-year floodplain? Ifso, note location on the site plan. The proposed project is not located within a 100 year floodplain. 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. The proposed project does not involve any discharges of waste materials to surface waters. b. Ground 1) Will ground water be withdrawn, or will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known. Limited infiltration of stormwater runoff is anticipated via the new pervious concrete sidewalks to be installed south of the proposed roadway widening. The volume infiltrated will be minimal because site soils are not highly permeable. Perforated underdrain pipes installed beneath the pervious concrete and connected to the storm sewer system will convey any runoff that is not infiltrated any from the sidewalk areas. 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following Bulletin #050 — August 19, 2004 Page 6 of 16 k:\Handouts\Environinental Checklist chemicals...; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. As wastewater will be discharged to groundwater, the stormwater runoff infiltrated via the pervious concrete sidewalks will be from nonpollution generating surfaces, such as landscaped area and sidewalks and is designed in accordance with current Washington State Department of Ecology requirements. c. Water Runoff (including stormwater) 1) Describe the source of runoff (including stormwater) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Stormwater runoff occurs during precipitation events from existing roadways, sidewalks, and parking lots within the project area. Currently, runoff from the project area is collected in catch basins and conveyed by underground pipes to two drainage facilities. Stormwater from the east discharge area is conveyed south through a regional constructed wetland at The Commons and to a flow control facility on the Bel-Mor housing community; the facility discharges to wetlands areas near South 336th Street. Stormwater from the west discharge area is conveyed west to a facility at The Commons which discharges to a trunk line, ultimately discharging to the Kitts Corner Regional Stormwater Facility. The exit points for stormwater runoff from the project site will not be altered by the proposed improvements. 2) Could waste materials enter ground or surface waters? If so, generally describe. Stormwater runoff can contain waste materials generated in a typical urban environment. Pollutant generating surfaces will not be increased with the project, resulting in no increase in the potential for waste materials to enter ground or surface waters. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any. The project proposes the use pervious pavement to reduce the amount of runoff. Due to site constraints, stormwater runoffgenerated on the project site cannot be reasonably collected and treated for water quality. Water quality treatment will be provided adjacent to the project site for an equivalent area via a stormwater treatment system consisting of a pretreatment device and a media filter vault. 4. PLANTS a. Check or circle types of vegetation found on the site. eciduous tr : alder, maple, aspen, other ever n ee: fir, cedar, pine, other shrubs ass pas re _ crop or gram wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other water plant: water lily, eelgrass, milfoil, other _other types of vegetation Bulletin #050 — August 19, 2004 Page 7 of 16 k:\Handouts\Environmental Checklist b. What kind and amount of vegetation will be removed or altered? Minor vegetation removal ofstreetscape trees and grass will occurfor the intersection improvements. Because most of the project site is paved and little vegetation occurs, vegetation removal will be minimal. c. List threatened or endangered species known to be on or near the site. No threatened or endangered plant species are documented or known to be on or near the site. The project site is paved and developed and there is no suitable habitatfor listed species. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any. Urban landscaping will be restored with similar materials. 5. ANIMALS a. Circle any birds and animals that have been observed on or near the site or are known to be on or near the site. birds: hawk, heron, eagl songbird other: mammals: deer, bear, elk, beaver, other: fish: bass, salmon, trout, herring, shellfish, other: b. List any threatened or endangered species known to be on or near the site. No threatened or endangered fish or wildlife species are documented or known to be on or near the site. The project site is paved and developed and there is no suitable habitatfor listed species. Listed fish and marine mammal species occur in the Puget Sound located approximately 2-112 miles to the west, and listed fish occur in Hylebos Creek, located over 2 miles southeast of the project site. c. Is the site part of a migration route? If so, explain. The project area is situated in the Pack Flyway, a broad avian migratory corridor that extends from Alaska to Central America, and along which a multitude of bird species fly. Because the project area is in an urban commercial locale, critical stopover areas are not expected to occur on the site. d. Proposed measures to preserve or enhance wildlife, if any. Because the project site is located in a developed urban and commercial locale, the project avoids impacts to sensitive areas, such as wetlands and riparian areas, which are focal areas for wildlife. 6. ENERGY AND NATURAL RESOURCES a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. Electricity will be used for roadway illumination and traffic signals. Bulletin #050 — August 19, 2004 Page 8 of 16 k:\Handouts\Environmental Checklist b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. The proposed project will not cast shadows and, therefore, is not expected to affect the potential use of solar energy by adjacent properties. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any. Street lighting will be controlled to only illuminate roadways during hours of darkness. 7. ENVIRONMENTAL HEALTH a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste that could occur as a result of this proposal? If so, describe. No environmental health hazards, including exposure to toxic chemicals, fire, explosion, spill, or hazardous waste are presented by the project. Construction will require the use of vehicles and equipment that use fossil fuels, lubricants, and hydraulic fluids that can present hazards if not properly handled. The quantities and types of these materials will be typical of construction activities. 1) Describe special emergency services that might be required No special emergency services will be required for this project. 2) Proposed measures to reduce or control environmental health hazards, if any. No environmental health hazards are anticipated; however, as a precaution during construction, the contractor will implement BMPs to minimize the potential for a release to soil, groundwater, or surface water. In addition, the contractor will be required to prepare and maintain a spill prevention control and countermeasures (SPCA plan on site. b. Noise 1) What types of noise exist in the area that may affect your project (for example: traffic, equipment operation, other)? Roadway traffic and freight delivered by vehicle comprise the primary existing noise sources in the project vicinity. I-S is located approximately 112 mile to the east and South 320th Street and 20th Avenue South are part of the project site. Surrounding uses include commercial uses, such as restaurant, office space, and commercial outlets. The project area is already developed and the project consists of roadway improvements; therefore, it is not expected that noise from vehicle use will affect the proposed project. 2) What types and levels of noise would be created by or associated with the project on a short- term or long-term basis (for example: traffic, construction operation, other)? Indicate what hours noise would come from the site. Construction activities will result in temporarily elevated noise levels during the operation of construction equipment. Construction activities typically will occur during daylight hours; however, to minimize traffic -related impacts during lane closures, some night-time Bulletin #050 — August 19, 2004 Page 9 of 16 k:\Handouts\Environmental Checklist construction is anticipated. Construction hours are anticipated to be between 7 a.m. and 7 p.m., with same rri,ght-time construction occurring between dusk and 7 a-m. — war Ap r eXtegh,0n -60rn Cire-iu,m4 -ror va9kt+., w w. ,-te. 3) Proposed measures to reduce or co al noise impacts, if any. Construction noise will be controlled by the use of properly sized and maintained mufflers, by engine intake silencers and engine enclosures and confining most construction activities to daylight hours. The site is an urban commercial area with existing traf c noise. Residential uses are limited in the area and the project noise levels are not expected to be significantly above existing noise levels resulting in minimal impacts. 8. LAND AND SHORELINE USE a. What is the current use of the site and adjacent properties? Uses of the proposed project site and surrounding area are primarily commercial. Properties adjacent to the proposed project include retail, intensive commercial, and professional office uses. b. Has the site been used for agriculture? If so, describe. No areas of the site have been used for agriculture in the recent past. Like many areas of King County, the project site was likely used for agriculture prior to urban development. c. Describe any structures on the site. The project area is located within the rights -of -way of South 320th Street and 20th Avenue. The roadways are bounded by sidewalks. There are no building structures within the project site. The project area includes roadway illumination and street lights. d. Will any structures be demolished? If so, what? No structures will be demolished with the project. e. What is the current zoning classification of the site? The project site zoned CC -City Center Core. f. What is the current comprehensive plan designation of the site? The current (April 2012) comprehensive plan designation of the project site is City Center Core. g. If applicable, what is the current shoreline master program designation of the site? The project site is not located along a shoreline and there is no shoreline master program designation for the site. h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. According to the Ciry s critical areas map, the project site is not located within an environmentally sensitive area. A review of Washington Department of Fish and Wildlife Priority Habitat Species online mapping does not indicate presence of any sensitive natural resources at the project site. Bulletin #050 — August 19, 2004 Page 10 of 16 k.\Handouts\Environmental Checklist i. Approximately how many people would reside or work in the completed project? The proposed project will improve an intersection and no one will be housed or employed by the completed project. j. Approximately how many people would the completed project displace? No residences will be removed, and no residents will be displaced. k. Proposed measures to avoid or reduce displacement impacts, if any. No mitigation measures are proposed because no displacement will occur. 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any. The proposed project is compatible with existing and project land uses and plans, including the Federal Way Comprehensive Plan; City zoning and development standards; environmental regulations; and local, state, and federal permitting requirements. The project is included on the City of Federal Way Six Year Transportation Improvement Plan and in the transportation element of the City's Comprehensive Plan. 9. HOUSING a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low- income housing. The project will not provide any housing units. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. The proposed project will not eliminate any housing units as there is no housing in the area. c. Proposed measures to reduce or control housing impacts, if any. Mitigation is notproposed because there are no housing impacts. 10. AESTHETICS a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The roadway improvements will be consistent with the elevation of the adjacent roadway. The roadway illumination will be approximately 30 feet above existing grade. b. What views in the immediate vicinity would be altered or obstructed? The construction will modify the landscape and, thus, affect views of the project area from adjacent properties, which consist of commercial uses. There is no housing in the project area. These landscaped features are typical of the urban environment and the changes will not alter the character of the area significantly. Bulletin #050 - August 19, 2004 Page 11 of 16 k:\Handouts\Environmental Checklist c. Proposed measures to reduce or control aesthetic impacts, if any. The project will use street illumination, signals, and landscaping that is similar to the surrounding urban landscaping. Landscaping that will be impacted by the project will be replaced. 11. LIGHT AND GLARE a. What type of light or glare will the proposal produce? What time of day would it mainly occur? The proposed project proposes utility relocation, roadway illumination, and replacement of the existing traffic signal at South 320th Street at 20th Avenue. Post -construction light and glare are anticipated to be consistent with current conditions. Construction lighting will be necessary to operate construction machinery during low -light conditions and during the nighttime construction that will be needed to minimize traffic impacts during lane closures as the turn lanes are installed. The construction area will be litfor nighttime construction between dusk and 7 a.m. at the latest to minimize traffic impacts during peak demand hours. Nighttime lighting will be necessaryfor the crane during operation. b. Could light or glare from the finished project be a safety hazard or interfere with views? Roadway illumination and replacement of the existing traffic signal at South 320th Street at 20th Avenue are anticipated to improve safety and will not interfere with views. c. What existing off -site sources of light or glare may affect your proposal? Existing light standards are located along South 320th Street, at 20th Avenue, and in adjacent commercial parking lots. Lighting in these locations is designed to illuminate roadways and parking areas. These sources of light are not anticipated to affect the proposed project. Post - construction vehicle traffic will be a source of light and potential glare but will be similar to existing conditions. d. Proposed measures to reduce or control light and glare impacts, if any. New roadway illumination will point downwards to reduce light pollution of the nighttime sky. Temporary lightingfor construction will likely consist ofdirecdonal lighting, pointed away from oncoming traffic, as well as adjacent parking areas. 12. RECREATION a. What designated and informal recreational opportunities are in the immediate vicinity? Steel Lake Park, Celebration Park, and French Lake Park are located approximately 112 mile from the project site. b. Would the proposed displace any existing recreational uses? If so, describe. The proposed project is intended to improve safety along this corridor and will not displace any existing recreational uses. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any. Bulletin #050 — August 19, 2004 Page 12 of 16 k:�Handouts\Environmental Checklist The proposed project will not impact recreational opportunities and, there_fo►'c, no mitigation measures for reducing impacts on recreation are proposed. 13. HISTORIC AND CULTURAL PRESERVATION a. Are there any places or objects listed on, or proposed for, nation, state, or local preservation registers known to be on or next to the site? If so, generally describe. According to the Washington Information System for Architectural and Archaeological Records Data (WISAARD), no historic properties have been inventoried in the vicinity of the project site. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. There are no known landmarks or evidence of historic, archaeological, scientific, or cultural importance on or next to the site. c. Proposed measures to reduce or control impacts, if any. No impacts are anticipated because no resources are known to be within the project area. If any unknown archaeological resources are encountered, ground -disturbing activities will be halted in the area of thefind in accordance with RCW27.53.060 (Archaeological Sites and Resources) and RCW 27.44.020 (Indian Graves and Records). A professional archaeologist will be called in to assess the significance of the find and the Department of Archaeology and Historic Preservation in Olympia will be notified so that an appropriate course of action could be implemented. 14. TRANSPORTATION a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any. The project will involve modifications to South 320th Street east and west of its intersection with 20th Avenue South. South 320th is a Principal Arterial with a posted speed limit of 35 miles per hour and three travel lanes in each direction, a single left -turn lane, and sidewalks. The Federal Way Comprehensive Plan indicates that the a Principal Arterial is a "roadway connecting major community center and facilities, often construction with partial limitations on access and minimum direct access to abutting land uses. " 20th Avenue S is a Principal Collector with a posted speed limit of 25 miles per hour and a single travel lane in each direction, a single left -turn lane, and sidewalks. The Federal Way Comprehensive Plan indicates that a Principal Collector is a "roadway connecting two or more neighborhoods or commercial areas, while also providing a high degree ofproperty access within a localized area. Collectors have been separated into principal and minor designations according to the degree of travel between areas and the expected traffic volumes. " The project will not change existing access points to the street system. Bulletin #050 — August 19, 2004 Page 13 of 16 k:\landouts\Environmental Checklist b. Is the site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? South 320th is traveled by Metro Bus Routes 181 and 187. The Federal Way Transit Center is approximately 1, 000 feet northeast of the project location and serves multiple routes. Existing transit stops are located on South 320th Street approximately 150 feet west of 20th Avenue South on the north, and 200 linear feet east of 20th Avenue on the south. The north stop will not be affected by the project, while the south side stop will be relocated and a temporary stop maintained during construction. c. How many parking spaces would the completed project have? How many would the project eliminate? The proposed project does not include any parking. In order to accommodate the additional turn lane, the project will eliminate 15 parking spaces in the parking lot serving the commercial development to the south. d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). The proposed project will not require new roads or streets but will improve the existing intersection at South 3201h Street at 20th Avenue South by adding an additional left -turn lane to accommodate the left -turn volume and reduce impacts to through traffic. Both South 320th Street and 20th Avenue South are public roadways e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. The proposed project will not use water, rail, or air transportation, and is not located near such transportation facilities. f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. The project will improve an existing roadway and does not involve uses that have a transportation demand. No additional vehicular trips are anticipated to resultfrom the proposed project. g. Proposed measures to reduce or control transportation impacts, if any. Appropriate traffic control will be employed during construction to address safety and traffic flow. Construction will be phased to maintain existing access to businesses and at least two lanes of travel on South 320th Street. The existing transit stop that will be affected during construction will be moved outside the project area temporarily and replaced with the completed project. Pedestrian access will be maintained with detours and safe walkingpaths. 15. PUBLIC SERVICES a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally describe. The proposed project will not result in an increased need for public services. b. Proposed measures to reduce or control direct impacts on public services, if any. Bulletin #050 — August 19, 2004 Page 14 of 16 k:\Handouts\Environmental Checklist No measures to reduce or control direct impacts on public services are proposed, as no impacts are anticipated. 16. UTILITIES a Mies t1y available at the sit • electricity, atural gas, water, re se service, telephone, tary sew ,septic system, oche ptics. b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity that might be needed The project will require electricity and data connections to serve the roadway illumination and traffic signals. These will be obtained from existing services in the project area. It is anticipated that the fiber optics and power conduit located south of the traveled way where the roadway widening will occur will need to be relocated. The water, sewer, gas, and power lines located within the north leg of the intersection may also need to be relocated to accommodate the storm drainage collection system that will be installed as part of this project. All utility access structure lids and valve covers will need to be adjusted to grade within the overlay area. I b) fan co-+r w t tl, L* - Cite of Fcdcm( VVA� Bulletin #050 — August 19, 2004 Page 15 of 16 k.\Handouts\Environmental Checklist C. SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. SIGNATURE: f V 4 q DATE SUBMITTED: I( fLa (n'Z O (a, Bulletin #050 — August 19, 2004 Page 16 of 16 k:�Handouts\Environmental Checklist n CITY OF Federal Way DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES 33325 8th Avenue South PO Box 9718 Federal Way WA 98063-9718 253-835-7000; Fax 253-835-2609 www.citvoffederolwoy.com DECLARATION OF DISTRIBUTION I, Kennith Geo_e hereby declare, under penalty of perjury of the laws of the State of Washington, that a: ❑ Notice of Land Use Application/Action ❑ Land Use Decision Letter ❑ Notice of Determinatian of Significance (DS) and Scoping Notice )1_"Notice of Environmental Determination r Nonsignificance (SEPA, DNS) ❑ Notice of Mitigated Environmental Determination of Nonsignificance (SEPA, MDNS) ❑ Notice of Land Use Application & Optional DNS/MDNS ❑ FWRC Interpretation ❑ Other ❑ Notice of Public Hearing before the Hearing Examiner ❑ Notice of Planning Commission Public Hearing ❑ Notice of LUTC/CC Public Hearing ❑ Notice of Application for Shoreline Management Permit ❑ Shoreline Management Permit ❑ Adoption of Existing Environmental Document was ❑ mailed ❑ faxed ❑ e-mailed and/or posted to or at each of the attached addresses on Janua 10 2013. Project Name South 320rh Street @ 20'h Avenue South Intersection Imp rgvements File Number(s) 12-105336-00-SE Signak Date �� K:\Intern\Declaration of Distribution of Distribution with Posting Sites.doc Posting Sites: Federal Way City Hall- 33325 8th Avenue Federal Way Regional Library- 34200 1st Way South Subject Site- Northeast corner of htersectionS 320th ST & 20th AVE S K-Nntern\Declaration of Disiribution notices\Declaration of Distribution with Posting Sites.doc ,:S CITY OF �' "'° yF'r Federal Way NOTICE OF ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE (DNS) South 320`h Street @ 20`4 Avenue South Intersection Improvements Federal Way File No: 12-105336-00-SE Proposal: Proposed project includes widening South 320'h Street for an additional left -turn lane eastbound and westbound. Improvements include the installation of new curb, gutters, sidewalk, and a stormwater treatment system along 2e Avenue South. Applicant: Brian Roberts, City of Federal Way Public Works, 33325 81h Avenue S, Federal Way Location: S 320'h Street @ 20`h Ave S right-of-way, Federal Way Lead Agency: City of Federal Way Community and Economic Development Department Staff Contact: Becky Chapin, Assistant Planner, 253-835-2641 The Responsible Official of the City of Federal Way hereby makes the following threshold determination based upon impacts identified in the Environmental Checklist; Federal Way Comprehensive Plan; and other policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the State Environmental Policy Act Rules pursuant to RCW 43.21 C.060. The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.2 1 C.032(2)(c). This decision was made after review of a completed environmental checklist, Engineering permit application, and other information on file with the lead agency. The project file is available for review during normal business hours at the Permit Center located on the second floor of City Hall. This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on January 25, 2013. Vicinity Map k T _ f� �Proiect Area U_ Q Q Unless modified by the City, this determination will become final following the above comment deadline. Any person aggrieved of the City's lnal determination may file an appeal with the Federal Way City Clerk (33325 8`' Avenue South, Federal Way, WA 98003), no later than February 8, 2013. Any person appealing the decision should be prepared to make specific factual objections. Printed in the Federal Way Mirror on January 11, 2013. Doc I D 61592 41k CITY Federalo. Way DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES 33325 8th Avenue South Federal Way WA 98003 253-835-7000; Fax 253-835-2609 www.dl offederalw .cam DECLARATION OF DISTRIBUTION 1, _1 1 xnllY��hereby declare, under penalty of perjury of the laws of the State of Washington, that a: ❑ Notice of Land Use Application/Action ❑ Notice of Determination of Significance (DS) and Scoping Notice P: Notice of Environmental Determination of Nonsignificance (SEPA, DNS) ❑ Notice of Mitigated Environmental Determination of Nonsignificance (SEPA, MDNS) ❑ Notice of Land Use Application & Optional DNS/MDNS ❑ FWRC Interpretation ❑ Other ❑ Land Use Decision Letter ❑ Notice of Public Hearing before the Hearing Examiner ❑ Notice of Planning Commission Public Hearing ❑ Notice of LUTC/CC Public Hearing ❑ Notice of Application for Shoreline Management Permit ❑ Shoreline Management Permit ❑ Adoption of Existing Environmental Document was ❑ mailed ❑ faxed D<e-mailed and/or ❑ posted to or at each of the attached addresses on Project Name File Number(s) ) a - i b S —�; Signat ure Date K:\CD Administration Rles\Declaration of Distribution.doc/Last printed 1/12/20122:20:00 PM Tamara Fix From: Rudi Alcott <ralcott@fedwaymirror.com> Sent: Wednesday, January 09, 2013 8:59 AM To: Tamara Fix Subject: Re: Legal Notice - 320th intersection No problem. We will get this done for you. Thanks, Rudi Alcott Publisher Office: 253-925-5565, Ext 1050 Internal: 02-1050 Fax: 253-925-5750 Mobile: 253-336-5359 31919 1st Ave S, Ste 101, Federal Way, WA 98003 191- Sound Publishing, Inc. Map Prtnt Hates Online Rates Media Kt Sound Info On Wed, Jan 9, 2013 at 8:50 AM, Tamara Fix <Tamara.Fix glcityoffederal_way.com> wrote: Please publish the attached notice (S 320th @20th Ave DNS, #12-105336) in Friday's (Jan. 11, 2013) issue. Please confirm and issue an affidavit of publication. Thanks! Tamara Fix City of Federal Way Tamara. fix@cit offederalwa .com 253-835-2602 "Just think about how happy you'd be if you lost everything and everyone you have right now, and then somehow got everything back again." Kobi Yamada 1 Aft CITY OF Federal Way NOTICE OF ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE (DNS) Proposal: Applicant: Location: South 32e Street @ 2e Avenue South Intersection Improvements Federal Way File No: 12-105336-00-SE Proposed project includes widening South 320`' Street for an additional left -turn lane eastboun- and westbound. provemen s include the ms a a ion o new cur>T , gutters, sidewalk, and a stormwater treatment system along 20a' Avenue South. Brian Roberts, City of Federal Way Public Works, 33325 8'h Avenue S, Federal Way S 320a' Street @ 20th Ave S right-of-way, Federal Way Lead Agency: City of Federal Way Community and Economic Development Department Staff Contact: Becky Chapin, Assistant Planner, 253-835-2641 The Responsible Official of the City of Federal Way hereby makes the following threshold determination based upon impacts identified in the Environmental Checklist, Federal Way Comprehensive Plan; and other policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the State Environmental Policy Act Rules pursuant to RCW 43.21 C.060. Vicinity Map The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.21C.032(2)(c). This decision was made after review of a completed environmental checklist, Engineering permit application, and other information on file with the lead agency. The project file is available for review during normal business hours at the Permit Center located on the second floor of City Hall. This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on January 25, 2013. Unless modified by the City, this determination will become final following the above comment deadline. Any person aggrieved of the City's final determination may file an appeal with the Federal Way City Clerk (33325 81h Avenue South, Federal Way, WA 98003), no later than February 8, 2013. Any person appealing the decision should be prepared to make specific factual objections. Printed in the Federal Way Mirror on January 11, 2013. 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C O v, O z7 Ln D r N G m U) .D �1 O r m SEE SHEET RP-5 MATCH LINE STA "P" 16+90 ----- ;` --�8- 1 I� - i o Kn Rb3o p42 842 g,l hi7 r 8 p�€TR�R 2�2 r�,gG g 4g Draft Geotechnical Engineering Design Study South 320th Street at 20th Avenue South Intersection Improvements Federal Way, Washington Prepared for BergerABAM March 12, 2012 17818-00 A A b1ww.hC;'C.fC'yy5F_fCO' 1 Draft Geotechnical Engineering Design Study South 320th Street at 20th Avenue South Intersection Improvements Federal Way, Washington Prepared for BergerABAM March 9, 2012 17818-00 Prepared by Hart Crowser, Inc. Nick Szot, PE Project Geotechnical Engineer 1700 Westlake Avenue North, Suite 200 Seattle, Washington 98109-6212 Fax 206.328.5561 Tel 206.324 9530 Barry S. Chen, Ph,D., PE Senior Principal CONTENTS Page 1.0 INTRODUCTION 1 1.1 Project Understanding 1 1.2 Purpose 2 1.3 Scope of Work 2 2.0 SUBSURFACE CONDITIONS 3 2.1 Soil Units 3 2.2 Groundwater 4 2.3 Falling Weight Deflectometer Testing 4 3.0 GEOTECHNICAL ENGINEERING DESIGN RECOMMENDATIONS 4 3.1 Site and Subgrade Preparation 5 3.2 Signal Pole Foundation Design 5 3.3 Pavement Design 6 3.4 Retaining Wall Design 10 3.5 Earthwork 14 3.6 Utility Design 17 3.7 Stormwater Facilities and Infiltration 18 4.0 THE USE OF THIS REPORT 20 5.0 REFERENCES 20 TABLES 1 Recommended Design N-Value and Lateral Bearing Pressure per WSDOT GDM for Level Ground _ 6 2 South 320 Street (West Leg) New Pavement Design Options 9 3 South 320 Street (Intersection and East Leg) New Pavement Design Options 9 4 20th Avenue South New Pavement Design Options 10 5 Design Parameters for MSE Walls 13 6 Summary of Grain Size Analysis 19 Hart Crowser 17818-00 March 9, 2012 DRAFT Page i CONTENTS (Continued) FIGURES 1 Vicinity Map 2 Site and Exploration Plan ATTACHMENT 1 FALLING WEIGHT DEFLECTOMETER TEST REPORT APPENDIX A FIELD EXPLORATION METHODS AND ANALYSIS APPENDIX B LABORATORY GEOTECHNICAL TESTING PROGRAM Page Page ii DRAFT Hart Crowser 17818-00 March 9, 2012 F ` DRAFT GEOTECHNICAL ENGINEERING DESIGN STUDY SOUTH 320TH STREET AT 20TH AVENUE SOUTH INTERSECTION IMPROVEMENTS FEDERAL WAY, WASHINGTON 1.0 INTRODUCTION This report provides geotechnical engineering design recommendations for the fr South 320th Street at 20th Avenue South Intersection Improvements project located in Federal Way, Washington. The project includes the following elements: ■ Construct up to four new signal poles on the corners of the intersection of South 320th Street at 20th Avenue South (intersection). ■ Widen and rehabilitate the roadway approximately 600 feet east and west of the intersection along South 320th Street, and approximately 250 feet north, and 150 feet south of the intersection along 20th Avenue South. ■ Construct short retaining walls along widened areas of South 320th Street; and ■ Install stormwater facilities near the intersection. The general location of the project is shown on the Vicinity Map (Figure 1) and Site and Exploration Plan (Figure 2). Boring logs of the explorations we conducted for this study are in Appendix A. The results of our laboratory t geotechnical testing program are in Appendix B. 1.1 Project Understanding This report specifically addresses signal pole foundation design, pavement design for new roadway sections, short retaining wall design, stormwater facility design, and earthwork recommendations in accordance with the following standards or specifications. ■ Washington State Department of Transportation (WSDOT) Standard Specifications for Road, Bridge, and Municipal Construction M 41-10, 2011; ■ WSDOT Pavement Guide, 1999; ■ WSDOT Interactive Pavement Guide; ■ WSDOT Geotechnical Design Manual (GDM) M46-03.01, 2011; Hart Crowser DRAFT Page 1 17818-00 March 9, 2012 1.2 Purpose ■ WSDOT Signal Design Memorandum (Appendix T10); ■ American Association of State Highway and Transportation Officials (AASHTO) Guide for Design of Pavement Structure, 1993; ■ King County Surface Water Design Manual, Management and Site Development Manual, 2009; and ■ City of Federal Way Addendum to the King County Surface Water Design Manual, 2010. The purpose of our work is to provide BergerABAM and the City of Federal Way with geotechnical engineering recommendations related to the design and construction of the South 320th Street at 20th Avenue South Intersection Improvements project. We present our conclusions and recommendations as follows: ■ Introduction ■ Subsurface Conditions ■ Geotechnical Engineering Design Recommendations ■ The Use of This Report ■ References 1.3 Scope of Work Our scope of work included: ■ Reviewing the applicable design requirements outlined by City of Federal Way, King County, and WSDOT design manuals and standard plans; ■ Completing a field exploration program consisting of five soil borings and falling weight deflectometer (FWD) testing to characterize the subsurface; ■ Completing a geotechnical laboratory testing program; ■ Providing signal pole foundation design recommendations for new signal poles at the intersection; ■ Providing flexible pavement design recommendations for new roadway sections; ■ Providing retaining wall design recommendations; ■ Evaluating stormwater infiltration rates for design of stormwater facilities; ■ Providing earthwork recommendations; ■ Evaluating the geotechnical construction considerations associated with the project; and ■ Preparing this geotechnical engineering design report. Page 2 DRAFT Hart Crowser 17818-00 March 9, 2012 y2.0 SUBSURFACE CONDITIONS Our understanding of the subsurface conditions is based on the information collected from our field explorations and FWD testing completed for this project and our experience with other projects in the Federal Way area. - We completed five shallow borings (HC-1 through HC-5) at the site, ranging in depth from 20.8 to 26.5 feet to characterize the site subsurface. The boring locations are shown on Figure 2, and the boring logs are contained in Appendix A. The nature and extent of soil variations between the borings may not become evident until construction starts. If the soil conditions are different than expected, it will be necessary to reevaluate the recommendations in this report. 2.1 Soil Units According to the subsurface information collected at the site, two soil units were encountered during our explorations. The two soil units are discussed below, from the ground surface downward. 2.1.1 Fill Fill deposits in the project area generally range between about 4 and 10 feet thick and consist of loose to medium dense silty sand with variable gravel content, and medium stiff silt with variable sand and gravel content. This unit may contain cobbles and other large unnatural obstructions that could impede drilling. 2.1.2 Native Silt, Sand, and Gravel A native silt, sand, and gravel soil unit was encountered below the fill and was generally observed to consist of layers of stiff to very stiff silt with variable sand content, and medium dense to very dense sand and gravel with variable silt a content. This soil unit was likely overridden and compressed to its current dense condition by ice during the Vashon glaciations; it exhibits high strength and low compressibility. Some layers in this soil unit exhibit "till -like" characteristics in that they have a high cohesive strength, low expected permeability, and a well - graded grain size distribution. Cobbles, boulders and hard drilling conditions may be encountered within this soil unit. a. . Hart Crowser DRAFT Page 3 17818-00 March 9, 2012 2.2 Groundwater Groundwater was observed in all the borings at the time of drilling at depths of 4 to 10 feet below ground surface (bgs). The groundwater was over the native silt, sand, and gravel soil unit, suggesting that the groundwater encountered in the borings is perched on top of the relatively denser and less permeable native soil unit. These groundwater measurements may not represent the static groundwater table at the site. Groundwater levels may fluctuate because of seasonal changes, rainfall, temperature, and other influences. 2.3 Falling Weight Def/ectometer Testing Pavement Engineers performed nondestructive deflection testing using the KUAB Falling Weight Deflectometer (FWD) in all lanes at testing intervals of 50 feet along South 320th Street and 20th Avenue South. The test applied impact loads up to 12,000 pounds and measured the resulting deflections to quantify the resilient modulus values of subsurface layers. Results of the FWD testing are presented in Attachment 1. The FWD stationing that corresponds to the FWD test results is shown on Figure 2. 3.0 GEOTECHNICAL ENGINEERING DESIGN RECOMMENDATIONS We developed our conclusions and recommendations based on the appropriate design references listed in the Project Understanding section, our current understanding of the project subsurface explorations, and local experience. If significant variations are observed at any time, modifications of these conclusions and recommendations may be needed. Our recommendations are organized as follows: ■ Site and Subgrade Preparation; ■ Signal pole foundation design; ■ Pavement design; ■ Retaining wall design; ■ Earthwork; ■ Stormwater facilities and infiltration. Page 4 DRAFT Hart Crowser 17818-00 March 9, 2012 3.1 Site and Subgrade Preparation Site and subgrade preparation should provide a firm and relatively non -yielding subgrade beneath pavement, sidewalk, and retaining wall foundation areas before placement of structural fill or crushed surfacing base course (CSBC). Initial site preparation should include removal of all visible organic material and any other deleterious material beneath pavement and sidewalk areas. We recommend proof rolling the subgrade area with heavy, pneumatic -tired construction equipment such as a loaded dump truck or front-end loader to test for unsuitable areas. During wet weather, or if vehicle access is not possible, the subgrade should be evaluated by hand probing. The subgrade should be relatively firm, unyielding, and without significant groundwater or loose or disturbed materials. 3.2 Signal Pole Foundation Design 3.2.1 Standard Plans ' We understand that four signal poles will be designed using the WSDOT Standard Specifications and design criteria presented in the 2010 WSDOT GDM and WSDOT Signal Design Memorandum (Appendix Tl 0). The signal poles are considered a cantilever signal according to the language used in the WSDOT GDM. 3.2.3 Foundations in or near Sloping Ground The values recommended for the foundations apply to relatively flat ground surfaces. Recommendations for foundations located on sloping ground are available in the WSDOT GDM Section 17.2.1. For sloping ground steeper than 31-1:1 V, but no steeper than 21-1:1 V, an additional foundation depth equal to one- half of the diameter of the foundation should be added to the depth determined for the level ground case. Hart Crowser 17818-00 March 9, 2012 3.2.4 Foundation Vertical Loads According to the WSDOT GDM, vertical loads for signal structure foundations are typically very low (i.e., 2 kips per square foot [ksf] or less) and do not control design at the site. If higher vertical loads are anticipated, further review may be needed to verify that the foundation design is adequate. DRAFT Page 5 3.2.5 Foundation Design Parameters The cantilever traffic signals poles are proposed to be located at the northeast, northwest, southeast, and southwest corners of the intersection of South 320th Street and 20th Avenue South. We advanced four borings near the proposed pole locations. Our foundation recommendations are based on the generalized soil properties observed from these borings. We observed that the soil conditions in each of the explorations are generally consistent with each other. In general, the subsurface conditions of the upper 5 to 10 feet consist of loose to medium dense fill overlying medium dense to very dense native silt, sand, and gravel. We have assumed strength parameters consistent with the fill soil unit to a depth of 10 feet below the ground surface. For depths greater than 10 feet below the ground surface, we have assumed strength parameters consistent with the native soil unit. Based on the observed subsurface conditions, we have estimated the weighted averages of the SPT blow counts (N values) from the borings over the foundation depth. Using guidelines from Table 17-2 of the WSDOT GDM, we have also estimated the corresponding allowable lateral bearing pressure. The results are summarized in Table 1. Table 1 — Recommended Design N-Value and Lateral Bearing Pressure per WSDOT GDM for Level Ground Recommended Design Allowable Lateral Bearing Depth Range SPT N-Value in Pressure in Pounds per in Feet Blows per Foot (bpfl Square Foot (psfl 0 to 10 7 1,200 10+ 25 4,200 3.3 Pavement Design In this section, we present information and recommendations for design of new flexible asphalt concrete pavement (ACP) sections. 3.3.1 Traffic Data We have obtained a summary of design traffic data from BergerABAM and the City of Federal Way for the project site. We designed the pavement using the methods presented in the 1993 AASHTO Guide for Design of Pavement Structure, and the 1999 WSDOT Pavement Guide. The City of Federal Way Page 6 DRAFT HartCrowser 17818-00 March 9, 2012 provided the following data, including the annual average daily traffic (AADT) and we have taken this data to represent the directional traffic count for each roadway (i.e., directional distribution factor equal to 1.0). ■ Project Build -Out Year = 2017 ■ Design Year = 2037 ■ South 320th Street Traffic Data ■ AADT:35,000 a Percent Truck: 3.0 percent ■ Lane distribution factor: 0.7 (WSDOT Pavement Guide recommends 0.6 to 0.8 for 3-lane roadways) ■ 20th Avenue South Traffic Data AADT:8,000 • Percent Truck: 1.0 percent • Lane distribution factor: 0.9 (WSDOT Pavement Guide recommends 0.8 to 1.0 for 2-lane roadways) The calculations for the equivalent single axle loads (ESAL) on the flexible pavement sections assume a design life of 20 years and a projected traffic growth of 2.5 percent per year based on WSDOT recommendations. We understand a smaller growth rate may be selected for final design at which point we may need to revise our pavement design recommendations. We recommend using the following assumptions to design ACP: .- ■ South 320th Street i 92 Million ESALs ■ 20th Avenue South • 9.1 Million ESALs 3.3.2 Resilient Modulus Determination Falling weight deflectometer (FWD) tests were performed February 1, 2012, along South 320th Street and 20th Avenue South travel lanes in each direction. A report presenting the FWD test procedure and results, prepared by Pavement Engineers, is presented in Attachment 1. The test results show varying values of subgrade resilient modulus measured over the project roadway areas. Through consideration of the FWD data, the subsurface information collected in our soil borings, and our experience with HartCrowser DRAFT Page 7 .. 17818-00 March 9. 2012 4 ' other projects in the area, we chose a design subgrade resilient modulus of 10,000 psi for design of new ACP sections along South 320th Street, west of the intersection (west leg), and all areas of 20th Avenue South. We chose a design subgrade resilient modulus of 8,000 psi for all new roadway sections along South 320th Street at the intersection itself, and east of the intersection (intersection and east leg), because the FWD test results showed consistently lower modulus values in those areas. We have assumed these values in our pavement design presented in the following sections. Based on the FWD test results and WSDOT recommendations, we have assumed a resilient modulus value of 28,000 psi for the compacted CSBC layer over the subgrade soil and below the ACP layer for design of new ACP sections. 3.3.3 New Pavement Design Design input parameters as required in the WSDOT Pavement Guide for the structural design of the new pavement sections are summarized as follows: South 320th Street ■ Design Equivalent Single Axle Loads (ESALs): 132 million ESALs in each direction ■ Reliability Value: 85 percent (recommended by WSDOT for Arterials) ■ Combined Standard Error of Traffic Prediction and Performance Prediction: 0.5 ■ Initial and Terminal Serviceability Index: 4.5 and 3.0, respectively ■ Layer Coefficients: 0.44 for hot mix asphalt and 0.13 for CSBC ■ Drainage Coefficient: 1.0. ■ Resilient Modulus: 28,000 psi for CSBC, and 10,000 psi for subgrade west of intersection, and 8,000 psi for subgrade at intersection and east of intersection. 20th Avenue South ■ Design Equivalent Single Axle Loads (ESALs): 10.2 million ESALs in each direction ■, Reliability Value: 80 percent (recommended by WSDOT and AASHTO for minor arterials and collectors) ■ Combined Standard Error of Traffic Prediction and Performance Prediction: 0.5 ■ Initial and Terminal Serviceability Index: 4.5 and 3.0, respectively ■ Layer Coefficients: 0.44 for hot mix asphalt and 0.13 for CSBC Page 8 DRAFT HartCrowser 17818-00 March 9, 2012 a - Drainage Coefficient: 1.0. a Resilient Modulus: 28,000 psi for CSBC, and 10,000 psi for subgrade 3.3.4 New Pavement Recommendations Subgrade soil should be prepared in accordance with the recommendations provided in the Subgrade Preparation section of this report. Existing subgrade soil should be compacted in place followed by placement and compaction of fill and CSBC to the desired thickness. Fill material below the CSBC layer should consist of compacted granular soil (common borrow per WSDOT Standard Specifications Section 9-03.14[3]). CSBC placed directly below pavement sections should meet the requirements of CSBC in section 9-03.9(3) of the 2010 WSDOT Standard Specifications (M41-10). Recycled concrete should not be used as CSBC. A positive drainage gradient should be provided within the CSBC layer to prevent surface water from accumulating under the pavement. Details should be provided in the plans to show continuous drainage paths in the CSBC layer. Construct new pavement over the prepared subgrade and CSBC layer according to the three design options shown on Table 2, Table 3, and Table 4 below, for South 320th Street (west leg), South 320th Street (intersection and east leg), and 20th Avenue South, respectively. Table 2 — South 320th Street (West Leg) New Pavement Design Options Design Options Layer 1 2 3 Total Asphalt Concrete Pavement (inches) 12.5 11.5 10.5 CSBC (inches) 6 9 12 Table 3 — South 320th Street (Intersection and East leg) New Pavement Design Options Design Options Layer 1 2 3 Total Asphalt Concrete Pavement (inches) 13.5 12.5 11.5 12 CSBC (inches) 6 9 Hart Crowser DRAFT Page 9 17818-00 March 9, 2012 Table 4 — 20th Avenue S New Pavement Design Options Design Options Layer 2 3 Total Asphalt Concrete Pavement (inches) 8 7.5 7 CSBC (inches) 6 9 12 Based on our correspondence with the City of Federal Way, we understand the "standard section" for new pavement depth is 13.8 inches ACP over 6 inches of CSBC. According to our calculations, this standard section is adequate for the project. 3.3.6 Existing At -Grade Pavement Rehabilitation (Overlay) Design Based on our correspondence with BergerABAM, we understand that the City of Federal Way is considering a 2.5-inch milling and subsequent ACP overlay of South 320th Street and has not requested design recommendations from Hart Crowser at this time for pavement overlay design. 3.4 Retaining Wall Design We understand that relatively short retaining walls less than 5 feet tall will be used along the newly widened south side of South 320th Street. Several retaining wall systems may be suitable authese areas. Selection of retaining wall type will depend on numerous factors including function, cost, and aesthetic appearance. Recommendations for cost-effective and geotechnically feasible retaining wall systems are presented below. 3.4.1 Vertical Foundation Support Regardless of the wall type selected, adequate vertical support of the wall system foundation must be provided. We present the following recommendations for vertical foundation support: N Retaining wall foundations may bear on existing subgrade soils provided they are prepared in accordance with the Site and Subgrade Preparation section of this report. Existing subgrade soils may need to be recompacted in place to achieve to relatively firm and unyielding surface. a Localized overexcavation may be required if unacceptable soil conditions (i.e., loose, wet, or organic material) are observed below the proposed base of the foundation during construction. If overexcavation beneath footings is Page 10 DRAFT HartCrowser 17818-00 March 9, 2012 r 4' necessary, backfill the overexcavated zone with properly compacted structural fill compacted to at least 95 percent of the maximum dry density (MDD) of the materials. Structural fill should only be placed on relatively firm and unyielding subgrade. a- ■ Structural fill used to replace overexcavated material should, at a minimum, extend outward and downward from the outer edges of the footing to the bearing layer at an angle no steeper than 1 horizontal to 1 vertical (1 HA V). ti ■ Retaining wall foundation excavations that are to be left open should be + protected from disturbance from construction activities such as water infiltration, equipment and foot traffic ■ Retaining wall foundations should be designed using a maximum allowable bearing pressure of 2 kips per square foot (ksf) for retaining wall foundation elements bearing on properly compacted structural fill. ■ Retaining wall foundations should have a minimum Width of 1.5 feet and bear a minimum of 18 inches below adjacent grade for frost heave protection. T ■ Hart Crowser should observe and document exposed subgrades before foundation construction. 3.4.2 Cast -in -Place Cantilevered Walls For cantilevered walls backfilled on one side, we provide the following t r recommendations and assumptions: ■ The wall backfill (compacted structural fill) behind the wall, and grade in front of the wall is level. s ' a For compacted structural fill behind the wall, compute the active and at -rest pressures using an equivalent fluid unit weight for the soil equal to 35 and 55 s pcf, respectively. These values are based on a drained condition behind the walls so there is no buildup of hydrostatic pressure. The use of active pressure is appropriate if the subgrade wall is allowed to yield a minimum 0.001 times the height of the wall. For a non -yielding wall, at -rest conditions should be used. ■ The backfill within 18 inches of the wall should consist of free -draining granular materials (discussed more in the Retaining Wall Drainage section of Y Hart Crowser DRAFT Page 11 r : 17818-00 March 9, 2012 a� this report) such that hydrostatic pressures do not develop and drainage will be provided behind the wall. ■ An appropriate allowable passive equivalent fluid unit weight for this material is 275 pcf (triangular distribution) acting on the front of the wall. A factor of safety of 1.5 has been incorporated into the passive resistance. ■ Use an allowable coefficient of friction to resist sliding equal to 0.35 for wall foundations placed on the granular structural fill. A factor of safety of 1.5 has been applied to this recommendation. 3.4.3 MSE Walls Reinforced soil retaining walls, commonly referred to as Mechanically Stabilized Earth (MSE) walls, are particularly well suited to fill applications where required excavation volumes are minimal. We provide the following recommendations for MSE wall design: ■ Provide a minimum factor of safety of 1.5 against sliding and pullout of reinforcing elements and 2.0 against overturning. Global slope stability should have a minimum static factor of safety of 1.5. ■ A minimum embedment of 2 feet should be required. Assumed passive pressures in front of the wall should be 0 (zero) for design purposes. ■ If proprietary MSE wall systems are used, the wall supplier is responsible to design the wall for adequate internal stability (i.e., to resist pullout and yield of reinforcing elements and overturning). We recommend that any proprietary wall system design be reviewed by Hart Crowser to verify that valid assumptions were made relative to material properties and other factors. ■ Backfill for MSE shall be selected and backfilled as specified by the MSE manufacturer. We recommend that Hart Crowser review the MSE manufacturer's recommendations for conformance with geotechnical recommendations and assumed design parameters. According the Federal Highway Administration (FHWA) MSE design manual, structural fill for MSE walls must meet the following requirements: Page 12 DRAFT HartCrowser 17818-00 March 9. 2012 Hart Crowser 17818-00 March 9, 2012 e Gradation requirement US Sieve Size 4 inch No. 4 No. 200 Percent Passinr� 100 0to60 0 to 15 The FHWA Design Manual recommends minimum and maximum particle sizes of 3/4 and 1-1/4 inches, respectively, to improve reinforcing element survivability. • Plasticity index (PI) shall be less than six. • All import fill must be free of contamination. ■ We recommend the design parameters summarized in Table 5 for use in design of MSE walls. Table 5 — Design Parameters for MSE Walls Backfill Soil Design Soil Property Compacted Retained Soil Foundation Soil Structural Fill Unit Weight (pc0 130 120 125 Friction Angle (degrees) 36 32 34 3.4.4 Gravity Walls We understand that gravity walls such as ecology block systems may be considered for use on this project. We recommend such walls be limited in height to 8 feet and be battered no steeper than 1 H:4V. Design details will depend on the gravity wall system selected, but generally should be designed for the active earth pressures provided above in Section 3.4.2. We recommend that design calculations and drawings for gravity wall systems be reviewed by Hart Crowser. 3.4.5 Retaining Wall Drainage To maintain adequate drainage and prevent buildup of hydrostatic pressure, we make the following recommendations: ■ Install drains at the base of all retaining walls consisting of rigid, 4-inch perforated pipe surrounded by drainage material; DRAFT Page 13 3.5 Earthwork ■ Structural fill placed around wall drains should meet the requirements of gravel backfill for drains (WSDOT Standard Specification 9-03.12(4)); and ■ Discharge wall drains to a suitable outlet. This section presents recommendations related to temporary and permanent slope stability, structural fill material selection and placement criteria, and weather considerations. 3.5.1 Open Cutting and Temporary Slopes We understand that temporary sloping and open cutting may be used around the site to facilitate grade transitions and retaining wall installation. The stability and safety of cut slopes depends on a number of factors, including: ■ The type and density of the soil; ■ The presence and amount of any seepage; ■ Proximity of the cut to any surcharge loads near the top of the cut, such as stockpiled material, traffic loads, structures, etc., and the magnitude of these surcharges; ■ Duration of the open excavation; and ■ Care and methods used by the contractor. Based on the above factors, we make the following recommendations regarding temporary slopes and open cuts: ■ Temporary slopes constructed in the existing site soils be inclined no steeper than 1-1/21H:1V; ■ Surface water be diverted away from the slopes; ■ Protect slopes from erosion by using plastic sheeting, waterproof tarps or flashcoating with shotcrete as necessary to maintain stability; ■ Limit the maximum duration of the open excavation to the shortest time period possible; and Page 14 DRAFT Hart Crowser 17818-00 March 9.2012 H a; ■ The general condition of the slopes be periodically observed by a qualified geotechnical engineer to confirm stability. Because of the variables involved, actual slope grades required for stability in temporary cut areas can only be estimated before construction. We recommend that stability of the temporary slopes used for construction be the sole responsibility of the contractor, since the contractor is in control of the construction operation and is continuously at the site to observe the nature and condition of the subsurface. Excavations should be made in accordance with all d- local, state, and federal safety requirements. 3.5.2 Permanent Slopes Based on a review of the preliminary projects plans and discussions with BergerABAM, we do not anticipate any permanent slopes steeper than 21-1:1 V (Horizontal:Vertical) and taller than a few feet at the site. In our opinion, slopes 2HA V or shallower should remain stable if properly compacted fill is used. Permanent slopes should be protected with suitable erosion control measures F such as vegetation or erosion control blankets. a, 3.5.3 Structural Fill Soils placed beneath structures, surrounding utilities, or below paved areas should be considered structural fill. In these fill areas, we recommend the # following: ■ Structural fill should only be placed on a relatively firm and non -yielding t- -_ subgrade. ■ Structural fill placed behind retaining walls should meet the requirements of gravel backfill for walls (WSDOT Standard Specification 9-03.12(2)). MSE backfill should be selected in accordance with wall designer or manufacturer's recommendations. ■ Structural fill placed as mass fill to elevate site grades, backfill temporary cut slopes, utility trenches, and below pavement sidewalk areas should meet the requirements of gravel borrow (WSDOT Standard Specification 9-03.14(1)), with the added exception that the fines content should not exceed 5 percent. ■ Structural fill placed around foundation and wall drains should meet the requirements of gravel backfill for drains (WSDOT Standard Specification 9- 03.12(4)). Hart Cromer 17818-00 March 9, 2012 DRAFT Page 15 ■ Structural fill placed as CSBC below pavement and sidewalks should meet the requirements of crushed surfacing base course (WSDOT Standard Specification 9-03.0(3)). ■ Crushed surfacing base course (CSBC) placed directly below pavement sections should meet the requirements of Base Course in section 9-03.9(3) of the 2010 WSDOT Standard Specifications (M41-10). Recycled concrete should not be used as CSBC. ■ Place and compact all structural fill in lifts with a loose thickness no greater than 10 inches. If small, hand -operated compaction equipment is used to compact Structural Fill, fill lifts should not exceed 6 inches in loose thickness. ■ Control the moisture content of the fill to within 2 percent of the optimum moisture. Optimum moisture is the moisture content corresponding to the maximum modified Proctor dry density. ■ In areas of general site filling, compact structural fill to a minimum of 90 percent below elevations corresponding to 2 feet below final subgrade. Below all structures and/or within 2 feet of final subgrade in general site filling areas, the compaction requirement should be at least 95 percent. The minimum dry densities recommended here are a percentage of the modified Proctor maximum dry density as determined by the ASTM D 1557 test procedure. ■ Structural fill placed against subgrade walls should be compacted to between 90 and 92 percent of the modified Proctor maximum dry density. Care should be taken when compacting fill against subsurface walls to avoid overstressing the walls. ■ If wet subgrade areas are encountered during foundation or pavement section preparation, clean material with a gravel content (material coarser than a U.S. No. 4 sieve) of at least 30 to 35 percent may be necessary. ■ The compacted densities of each lift should be verified by a Hart Crowser geotechnical engineer or engineering geologist. Before fill control can begin, the compaction characteristics of representative samples of the structural and drainage fill must be determined. Samples should be obtained as soon as possible. A study of compaction characteristics should determine optimum and natural moisture content, maximum dry density, and gradation of the fill material. Page 16 DRAFT Hart Crowser 17818-00 March 9, 2012 Use of On -Site Soil as Structural Fill The suitability of excavated site soil for use as compacted structural fill depends on the gradation and moisture content of the soil when it is placed. As the amount of fines (that portion passing the No. 200 sieve) increases, the soil a becomes increasingly sensitive to small changes in moisture content and s: adequate compaction becomes more difficult to achieve. Soil containing more r" than about 5 percent fines cannot be consistently compacted to a dense non - yielding condition when the water content is greater than about 2 percent above or below optimum. Reusable soil must also be free of organic and other compressible materials. Results of our laboratory analysis indicate that these site soil likely has a fines content great enough to make it moisture -sensitive when wet. It is possible that the soil could be used as fill during the drier summer construction season, especially if the material can be aerated using dozers or agricultural discs. �. Duringperiods of wet weather, it will be more difficult to use site soil. Earthwork would need to be scheduled during periods of dry weather to keep the moisture content of the material near its optimum level. We recommend that surficial layers of topsoil, if present, not be used as structural fill. This material likely contains significantly more than 5 percent fines and, therefore, will be moisture -sensitive during periods of wet weather. In I' addition, it contains organic matter that could lead to long-term settlement as that matter breaks down over time. Surficial topsoil may be used in landscaped areas provided that it can be compacted to a reasonable degree with construction equipment. 3.6 Utility Design ` Utility trench cut design should generally be the responsibility of the contractor. For shallow trench excavations (up to 4 feet deep), open cutting may be used provided there is adequate stability of the side walls. Trench boxes may be necessary for unstable side wall conditions or if deeper excavations are required f for utility placement. The contractor should verify the conditions of the side F slopes during construction and slope back trench cuts as necessary to conform to current Standards of Practice and safety requirements. Our recommendations for bedding and trench backfill material are presented below. The minimum dry densities recommended below are a percentage of the modified Proctor maximum dry density as determined by the ASTM D 1557 test procedure. Hart Crowser DRAFT Page 17 g 17818-00 March 9. 2012 ■ At least 4 inches of bedding is recommended for all utility pipes. We recommend that bedding material consist of well -graded sand and gravel with less than 3 percent material passing the number 200 sieve (based on the minus 3/4-inch fraction). Bedding material should be compacted with care not to damage the utility pipes. ■ The recommended bedding backfill material can be used as backfill around the pipe utilities (pipe zone backfill). Pipe zone backfill should extend to at least the top of the pipe. ■ For bedding material beneath catch basins and manholes, we recommend at least 6 inches of imported structural fill (or acceptable on -site material) that consists of well -graded sand and gravel with less than 3 percent passing the number 200 sieve (based on the minus 3/4-inch fraction). The bedding material should be compacted to at least 90 percent modified Proctor maximum dry density. 3.7 Stormwater Facilities and Infiltration Based on our correspondence with BergerABAM, we understand the type and location of stormwater facilities have not yet been specified for the project. However, the infiltration characteristics of the site soils are relatively independent of the specific location of the stormwater facilities at the site and are presented below. 3.7.1 Stormwater Infiltration A preliminary stormwater infiltration assessment was completed for the project. Our preliminary assessment is intended to determine whether full-scale infiltration testing is necessary, and is meant to screen out unsuitable sites and reduce testing costs. Our assessment is based on soil properties inferred from soil borings, field observations, and soil sample grain size analysis. Our evaluation is consistent with the guidance provided in the 2009 King County Surface Water Design Manual (Stormwater Manual), with revisions taken from the 2010 City of Federal Way Addendum to the King County Surface Water Design Manual, and our experience with similar sites. Specifically, our evaluation of the potential stormwater infiltration at the site was based on the following: x Soil conditions assumed from the five explorations (HC-1 through HC-5) completed for the project; Page 18 DRAFT Hart Crowser 17818-00 March 9, 2012 ■ Six soil samples from selected borings tested for grain size by mechanical analysis; and n Groundwater observations made at the time of drilling. Two soil units were encountered in the soil borings. The upper fill unit consists of silty sand with variable gravel content, and silt with variable sand content. The fill unit is between 4 and 10 feet thick. Beneath the fill is a native soil unit consisting of layers of silt with variable sand and gravel content, and sand and gravel with variable silt content. Groundwater was observed in all the borings within the fill at depths ranging from 4 to 10 feet bgs. Our field observations suggests that the groundwater encountered in the borings is likely perched on top of the less permeable native soil unit. Selected soil samples from each boring were analyzed for grain size by mechanical sieve analysis. The grain size results are provided in Appendix B and summarized in Table 6. In general, there is correlation between infiltration potential and the fines content of the soil. Favorable infiltration conditions are associated with sand and gravel with a fines content less than 15 percent. The fines content of samples collected for this assessment ranged from 26 to 89 percent over the upper 9 feet of site soils, with an average of 54 percent fines. Based on the grain size analysis and field observations of the shallow fill and native site soil, conditions are unfavorable for infiltration in shallow soil at the site. For preliminary design purposes, we estimate that the design infiltration rate would 0.5 inches per hour or less. A more precise determination of the infiltration rate would require site -specific infiltration testing. Table 6 — Summary of Grain Size Analysis Boring Sample Depth in feet Soil Classification Fines Content in percent Unit HC-2 2.5-4 Vey Sandy Silt 52.1 Fill 5-6.5 Very SiltSand 39.0 Fill HC-3 5-6.5 Sli tly Sandy Silt 89.1 Native HC-4 2.5-4 Sand 26.3 Fill 5-6.5 —Silty Very Silty Sand 29.6 Fill 7.5-9.0 Very SHN Sand 36.1 Fill HartCrowser DRAFT Page 19 17818-00 March 9, 2012 4.0 THE USE OF THIS REPORT This report has been prepared for the exclusive use of BergerABAM, the City of Federal Way, and their design consultants for specific application to the subject project and site. This study has been performed in accordance with generally accepted geotechnical engineering practices in the same or similar localities, related to the nature of the work accomplished at the time the services are performed. No other warranty, express or implied, is made. 5.0 REFERENCES American Association of State Highway and Transportation Officials (AASHTO). AASHTO Guide for Design of Pavement Structure, 1993. City of Federal Way. Addendum to the King County Surface Water Design Manual, February 2010. King County Surface Water Design Manual, 2009. Washington State Department of Transportation. Geotechnical Design Manual, Publication No. M46-03, November 2010. Washington State Department of Transportation. Pavement Guide, WSDOT M 46-03, 1999. Washington State Department of Transportation. Signal Design Memorandum (Appendix T10), 2010. L:\Jobs\7 781800\Geo Eng Design Study\Draft\S 320th Intersection Report.doc Page 20 DRAFT HartCrowser 17818-00 March 9, 2012 L This page is intentionally left blank for double -sided printing. r-----.._ — —•----I--- ruler Westbound Lane I - Center Westbound Lane n Inner westbound lane 0+00 t+pp - i O O O V I � � ! i Z�HC-1 C> r f —South 320th Street= - 5+00 -- - 6+00 0 7+00 —�- �- 9+00 HG0 -�- r o HC-3 CD m+ o� z { a = • HC-4 0 a HC-1 • Boring Location and Number 0 Falling Weight Deflectometer Stationing - South 320th Street i Failing Weight Deflectometer Stationing - 20th Avenue South Source: Base map prepared from AutoCAD file 'COMBINED 2011-11-14.dwg," provided by BergerABAM on 11/15/2011. 72+Q - 9+00 --'��* InnerEastbourdzane�T3+i)C7.p� Center Esne Quter EastbovW Lane I i � _--_--_---_-I- -----L i i N 0 100 200 Scale in Feet South 320th Street at 20th Avenue South Intersection Improvements Federal Way, Washington Site and Exploration Plan 17818-00 NO ii w 3/12 Figure 2 ATTACHMENT 1 FALLING WEIGHT DEFLECTOMETER TEST REPORT c L Hart Crowser DRAFT L 17818-00 March 9, 2012 ' PAVEMENT ENGINEERS WBE# W2F4707915 3 March 1, 2012 15226 12th Drive S.E Mill Creek, WA 98012-3082 Scott Wright (425) 337-5222 (888)446-5222 Senior Associate Geologist (website: pvmtengr.com) Hart Crowser, Inc. 1700 Westlake Ave N, Suite 200 Seattle, WA 98109-6212 z, Re: Pavement Testing and Analysis S. 320tb St and 20th Ave S City of Federal Way, WA Mr. Scott Wright: At your invitation, the pavements in the intersection of S. 320th St and 20tb Ave S, Federal Way was tested and evaluated. This report provides the results of that testing in the form of graphs and charts. Non -Destructive Deflection Testing We conducted non-destructive deflection testing using the KUAB Falling Weight Deflectometer, FWD, which can impacted the pavement surface with loads from 5,000 pounds to 36,000 pounds ,. depending on the configuration of the equipment. For this project, the equipment applied two impact loads of approximately 9,000; and 12,000 pounds. These loads are intended to simulate 1 heavy truck traffic. T Tests along these two streets were taken at 50 foot intervals in all lanes. Approximately 450 feet of pavement was tested along 201" Ave S. and 1,200 feet along S. 320`h St. This provided sufficient tests for statistical analysis and evaluation. These five lines of testing were combined into five sets of figures as explained below. Analysis Figures la, 2a, 3a, 4a and 5a present the deflections normalized to 9,000 pounds. Figures lb, 2b, 3b, 4b and 5b present the back -calculated modular values of an idealized pavement structure of asphalt surface, base, and subgrade. Please realize the subgrade modular values are the true modular values of the subgrade and do not have to be corrected as discussed in AASHTO Guide for the Design of Pavement Structures, paragraph 5.3.2. This paragraph recommends adjusting the back -calculated subgrade modular value by a valueof 0.33. Our analysis has taken this recommendation into consideration and no additional adjustment is necessary. By separate document, we provided you with the calculated values of the data presented in the enclosed graphs. Figures 1 c — 5c present the back -calculated Equivalent Thickness of the asphalt surface. The thicknesses calculated are based an effective thickness with a modulus of 450,000 psi at 70' F. If you have any additional questions on this project, please let us know. Pavement Engineers Inc. 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E I !, E F I l l O I I ` I j V 1 I I I I I I 1 1 1 1= I 1 F I 1 I 1 1 1 1 1 1 f 1 1 1 1 O `^ VJ -T-i To ---r-T-F-TTrnT-- T- TTFI Oca I 1 1 1 l l I 1! I i l l l I 11! 1 I 1 I I F 1111 11 111 CL 1 1 E E 1 1 I I I I 1 1 7 7 I 1 F[ ! fI I E I 1 f 111 N 1 F F [ I I Ili: I: I i + O O (nU) (D C� Jc cu D cr w O C) LO T-- T- 0 0 ♦ 0 ♦ T— a I 0 A APPENDIX A FIELD EXPLORATION METHODS AND ANALYSIS Hart Cromer 17818-00 March 9, 2012 T'; APPENDIX A FIELD EXPLORATION METHODS AND ANALYSIS This appendix documents the processes Hart Crowser used to determine the nature and characteristics of the soil and groundwater underlying the project site. The discussion includes information on the following subjects: �` ■ Selection of Exploration Type and Location; . ■ Explorations and Their Location; ■ Hollow -Stem Auger Borings; and ■ Standard Penetration Test (SPT) Procedures. Selection of Exploration Type and Locations The exploration locations for this project were selected based on the proposed location of project elements at the time of the explorations, existing utilities, and property access agreements. Soil borings were completed to characterize subsurface conditions for pavement, retaining wall, and signal pole design. Falling weight deflectometer testing supplemented the subsurface information gathered specifically for pavement design. Explorations and Their Location Subsurface explorations for this project include HC-1 through HC-5. The exploration logs in this appendix show our interpretation of the drilling, sampling, and testing data. The logs indicate the depth where the soils change. Note that the change may be gradual. In the field, we classified the samples taken from the explorations according to the methods presented on Figure A-1 - Key to Exploration Logs. This figure also provides a legend explaining the symbols and abbreviations used in the logs. Location of Explorations. Figure 2 shows the boring locations measured by hand from existing physical features. _ Hollow -Stem Auger Borings With depths ranging from 20.8 to 26.5 feet below the ground surface, five hollow -stem auger borings, designated HC-1 through HC-5, were drilled from February 1 to February 2, 2012. The borings used an 8-inch diameter hollow - stem auger and were advanced with a track -mounted drill rig subcontracted by Hart Crowser. The drilling was continuously observed by a geologist from Hart Crowser. Detailed field logs were prepared for each boring. Using the Standard Penetration Test (SPT), we obtained samples at 2-1/2-foot intervals. Hart Crowser DRAFT Page A-1 17818-00 March 9.2012 The borings logs are presented on Figures A-2 through A-6 at the end of this appendix. Standard Penetration Test (SPT) Procedures This test is an approximate measure of soil density and consistency. To be useful, the results must be used with engineering judgment in conjunction with other tests. The SPT (as described in ASTM D 1586) was used to obtain disturbed samples. This test employs a standard 2-inch outside diameter split - spoon sampler. Using a 140-pound manual hammer, free -falling 30 inches, the sampler is driven into the soil for 18 inches. The number of blows required to drive the sampler the last 12 inches only is the Standard Penetration Resistance. This resistance, or blow count, measures the relative density of granular soil and the consistency of cohesive soil. The blow counts are plotted on the boring logs at their respective sample depths. Soil samples are recovered from the split -barrel sampler, field classified, and placed into watertight jars. They are then taken to Hart Crowser's laboratory for further testing. L.\Jobs\7 781800\Geo Eng Design Study\Draft\S 320th Intersection Report_doc Page A-2 DRAFT Hart Crowser 17818-00 March 9, 2012 r I Key to Exploration Logs Sample Description Classification of soils in this report is based on visual field and laboratory observations which include density/consistency, moisture condition, grain size, and plasticity estimates and should not be construed to imply field nor laboratory testing unless presented herein. Visual -manual classification methods of ASTM D 2488 were used as an identification guide. Soil descriptions consist of the following: Density/consistency, moisture, color, minor constituents, MAJOR CONSTITUENT, additional remarks. Density/Consistency Soil density/consistency in borings is related primarily to the Standard Penetration Resistance. Soil density/consistency in test pits and probes is estimated based on visual observation and is presented parenthetically on the IQ S. Standard SAND or GRAVEL Penetration SILT or CLAY Standard Approximate Penetration Shear Strength Density Resistance (N) Consistency Resistance (N) in TSF In Blows/Foot in BiowslFoot Very loose 0 to 4 Very soft 0 to 2 <0.125 Loose 4 to 10 Soft 2 to 4 0.125 to 0.25 Medium dense 10 to 30 Medium stiff 4 to 8 0.25 to 0.5 Dense 30 to 50 Stiff 8 to 15 0.5 to 1.0 Very dense >50 Very stiff 15 to 30 1.0 to 2.0 Hard >30 >2.0 Sampling Test Symbols ® 1.5" I.D. Split Spoon ® Grab (Jar) ❑ 3.0" I.D. Split Spoon m Shelby Tube (Pushed) Bag In Cuttings Q Core Run SOIL CLASSIFICATION CHART MAJOR DIVISIONS SYMBOLS TYPICAL DESCRIPTIONS GRAPH LETTER GRAVEL AND CLEAN GRAVELS •'� • GW WELL GRADED GRAVELS, GRAVEL - SAND MIXTURES, LITTLE OR NO FINES GRAVELLY SOILS (LITTLE OR NO FINES) 0 �o • GP ,. POORLYGRADED GRAVELS, GRAVEL -SAND MIXTURES, LITTLE ' OR NO FINES COARSE GRAINED SOILS MORETOF Ca RSE % GRAVELS WITH FINES ° e • GM SILTYGRAVELs,GRAVEL . SAND - SILT MIXTURES FRACTION RETAINED ON NO. 4 SIEVE (APPRECIABLE AMOUM OFINES) GC CLAYEY GRAVELS, GRAVEL -SAND - CLAY MIXTURES MORE THAN 50% OF MATERIAL IS SAND AND CLEAN SANDS •:-•+-'•= --�'.• �- . SW IAELLGRADED SANDS, GRAVELLY SANDS, LITTLE OR NO FINES LARGER THAN NO.200 SIEVE SIZE SANDY SOILS SOILS OR NO FINES) _ - S' P POORLY -GRADED SANDS, GRAVELLY SAND. LITTLE OR NO FINES SANDS WITH FINES _ _ SM SILTY SANDS, SAND -SILT MIXTURES OMORECOARSTHAN �' FRACTION PASSING ON NO. 4 SIEVE (APPRECIABLE AMOUNT OF FINES) S.G. CLAYEY SANDS, SAND -CLAY MIXTURES INORGANIC SILTS AND VERY FINE ML SANDS, ROCK FLOUR, SILTY OR CLAYEY FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICrTY INORGANIC CLAYS OF LOW TO SILTS FINE GRAINED SOILS AND LESS QUID THAN IT CLAYS ``L MEDIUM PLASTICITY, GRAVELLY CLAYS, SANDY CLAYS, SILTY CLAYS, LEAN CLAYS OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY MORE THAN L I OF MATERIAL SS SMALLER THAN NO.200 SIEVE MH INORGANIC SILTS, MICACEOUS OR DIATOMACEOUS FINE SAND OR SILTY SOILS SIZE SILTS AND LIQUID LIMIT CLAYS GREATER THAN 50 CH INORGANIC CLAYS OF HIGH PLASTICITY OH ORGANIC CLAYS O MEDIUM TO HIGH PLASTICITY, ORGANIC SILTS HIGHLY ORGANIC SOILS .T. ` .I. PT PEAT, HUMUS, SWAMP SOBS WITH Hlpi pRGaNlccoNTSNrs Moisture Dry Little perceptible moisture Damp Some perceptible moisture, likely below optimum Moist Likely near optimum moisture content Wet Much perceptible moisture, likely above optimum Minor Constituents Estimated Percentage Trace <5 Slightly (clayey, silty, etc_) 5 - 12 Clayey, silty, sandy, gravelly 12 -30 Very (clayey, silty, etc.) 30 - 50 Laboratory Test Symbols GS Grain Size Classification CN Consolidation UU Unconsolidated Undrained Triaxial CU Consolidated Undrained Triaxial CD Consolidated Drained Triaxial QU Unconfined Compression DS Direct Shear K Permeability PP Pocket Penetrometer Approximate Compressive Strength in TSF TV Torvane Approximate Shear Strength in TSF CBR California Bearing Ratio MD Moisture Density Relationship AL Atterberg Limits I --�—I Water Content in Percent Liquid Limit tJalural Plastic Limit PID Photoionization Detector Reading CA Chemical Analysis DT In Situ Density in PCF OT Tests by Others Groundwater Indicators V Groundwater Level on Date or (ATD) At Time of Drilling Groundwater Seepage (Test Pits) Sample Key Sample i ype Sample Recovery 12 S-1 23 50/3'. Sample Blows per Number 6 inches ✓IrJ♦ ♦W �7Up lf�OWSER 17818-00 2112 Figure A Y NOTE DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS Boring Log HC-1 Location: See Figure 2. Approximate Ground Surface Elevation: Feet Horizontal Datum: Vertical Datum: USCS Graphic Depth Class Log Soil Descriptions in Feet SM _ Very loose to loose, moist to wet, brownX. , gravelly, very silty SAND with occasional cobble. (FILL) GM 13 Dense, wet, gray, sandy, silty GRAVEL. TgATTD Perched groundwater from 10 to 12 feet. M/ML Medium dense, moist, brown, very sandy SILT to very silty SAND. ML Very stiff, brown, sandy SILT. 15 N 5M Medium dense, moist, brown to gray, gravelly, silty SAND. Bottom of Boring at 2 o Started 02/02/12. 0 Completed 02/02/12. Drill Equipment: Hollow Stem Auger Hammer Type: SPT w/140 lb. autohammer Hole Diameter. 8 inches Logged By: A. Wade Reviewed By: N. Szot STANDARD LAB PENETRATION RESISTANCE TESTS Sample A Blows per Foot 1. Refer to Figure A-1 for explanation of descriptions and symbols. 2. Soil descriptions and stratum lines are interpretive and actual changes may be gradual. 3. USCS designations are based on visual manual classification (ASTM D 2488) unless otherwise supported by laboratory testing (ASTM D 2487). 4. Groundwater level, if indicated, is at time of drilling (ATD) or for date specified. Level may vary with time. S-1 �10 4 S-2 4 12 S-3 �[[ 8 M 14 S-5 1s IAM 12 [Al2 S-6 10 10 7 S-7 10 412 S-9 e M12 0 10 20 34 40 50+ a 0 20 40 60 80 100+ ■ Water Content in Percent MM is I M.RTO? 0WSr? 17818-00 2112 Figure A-2 Boring Log F1C-2 Location: See Figure 2. Approximate Ground Surface Elevation: Feet Horizontal Datum: Vertical Datum: USCS Graphic Depth Class Log Soil Descriptions in Feet ML Medium stiff, moist, brawn, slightly gravelly, 0 sandy SILT with scattered organic material. (FILL) Mem d diuense, moist, gray, very silly, gravelly SAND. (FILL) Q P-SM Dense, moist to wet, brown to gray, gravelly. ATD slightly silty SAND. Perched groundwater from 7 to 14 feet. SM Medium dense, moist to wet, slightly gravelly, 0 silty SAND with heavy mottling. ML Very stiff,moist, gray, sandy SILT with scattered organic material.— L 15 F SM' Dense, moist, gray, gravelly, silty SAND. (Till -like) Bottom of Boring at 21.5 Feet. Started 02/01/12. Completed 02/01/12. Drill_ Equipment: Hollow Stem Auger Hammer Type: SPT w/140 lb. autohammer Hole Diameter: 8 inches Logged By: B. McDonald Reviewed By: N. Szot STANDARD LAB PENETRATION RESISTANCE TESTS Sample • Blows per Foot 0 10 20 40 50+ t S-1 2 • nc 1. Refer to Figure A-1 for explanation of descriptions and symbols. 2. Soil descriptions and stratum lines are interpretive and actual changes may be gradual. 3. USCS designations are based on visual manual classification (ASTM D 2488) unless otherwise supported by laboratory testing (ASTM D 2487). 4. Groundwater level, if indicated, is at time of drilling (ATD) or for date specified. Level may vary with time. 3 4 S-2 5 8 20 S-3 23 • 116 26 10 S-4 -• LVA 20 A14 S-81e 20 0 20 40 60 80 10D+ • Water Content in Percent rtlf ► A.1?7"owsr-I ? 17818-00 2/12 Figure A-3 zt&� Boring Log HC-3 Location: See Figure 2- Approximate Ground Surface Elevation: Feet Horizontal Datum: Vertical Datum: USCS Graphic Depth Class Log Soil Descriptions in Feet SM Medium dense, moist, gray, gravelly, silty, fine to medium SAND. (FILL) ML Stiff, moist, brown to gray, slightly sandy 5 SILT with organic material and heavy mottling. SM Medium dense, wet, brown, silty, slightly t gravelly, very silty SAND. Perched groundwater from 11 to 15 feet. GM Medium dense GRAVEL (based on drill action). SM Medium dense,moist, gray, trace to slight y gravelly, silty SAND. (Till -like) Becomes wet at 20 feet- 2 Bottom of Boring at 21.5 Feet. Started 02/01/12. Completed 02/01/12- 2 i 4D Drill Equipment, Hollow Stem Auger Hammer Type: SPT w/140 lb. autohammer Hole Diameter: 8 inches Logged By: B. McDonald Reviewed By: N. Szot STANDARD LAB PENETRATION RESISTANCE TESTS Sample L Blows per Foot 0 10 20 30 40 50+ r_1 1 1 1. Refer to Figure A-1 for explanation of descriptions and symbols. 2. Soil descriptions and stratum lines are interpretive and actual changes may be gradual. 3. USCS designations are based on visual manual classification (ASTM D 2488) unless otherwise supported by laboratory testing (ASTM D 2487). 4. Groundwater level, if indicated, is at time of drilling (ATD) or for date specified- Level may vary with time. 12 S-1 11 13 3 S-2 3 5 5 S-3 7 6 6 S-4 12 16 15 S-5 16 16 8 S-6 11 14 fi S-7 13 12 16 S-8 22 • 23 —GS L. 0 20 do 60 80 i00+ • Water Content in Percent WN L H. RT0Z0WSER 17818-00 2112 Figure A-4 T w z Boring Log HC-4 Location: See Figure 2. Approximate Ground Surface Elevation: Feet Horizontal Datum: Vertical Datum: USCS Graphic Depth Class Log Soil Descriptions in Feet SM Medium dense, moist, brown -gray, gravelly, silty SAND. (FILL) GM Medium dense, moist to wet, brown, very sandy, very silty GRAVEL. SM Medium dense, moist to wet, brawn, gravelly, ATTD very silty SAND. erched groundwater from 7 to 10 feet. 5M Medium dense to very dense, moist, brown }o to gray, gravelly, silty SAND. (Till -like) 5 Bottom of Boring at 21.5 Feet. Started 02/01/12. Completed 02/01/12, Drill Equipment: Hallow Stem Auger Hammer Type: SPT w/140 lb. autohammer Hole Diameter: 8 inches Logged By: B. McDonald Reviewed By: N. Szot STANDARD LAB PENETRATION RESISTANCE TESTS Sample a Blows per Foot 1. Refer to Figure A-1 for explanation of descriptions and symbols. 2. Soil descriptions and stratum lines are interpretive and actual changes may be gradual. 3. USCS designations are based on visual manual classification (ASTM D 2488) unless otherwise supported by laboratory testing (ASTM D 2487). 4. Groundwater level, if indicated, is at time of drilling (ATD) or for date specified. Level may vary with time. S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8 16 Water Content in Percent rit HA. fiTaOIl,7E 17818-00 2112 Figure A-5 Boring Log HC-5 Location: See Figure 2_ Approximate Ground Surface Elevation: Feet Horizontal Datum: Vertical Datum: USCS Graphic Class Log Soil Descriptions Drill Equipment: Hollow Stem Auger Hammer Type: SPT w/140 lb. autohammer Hole Diameter: 8 inches Logged By: A. Wade Reviewed By: N. Szot STANDARD LAB Depth PENETRATION RESISTANCE TESTS in Feet Sample • Blows per Foot SM A Loose, moist, gray, gravelly, silty SAND. (FILL) SM Medium dense to dense, wet, gray, slightly gravelly to very gravelly, silt to very silty SAND. (Till -like) Cobbles t GM Very denss, wet, silty, very sandy GRAVEL i Bottom of Boring at 20.8 Feet. Started 02/02/12. Completed 02/02/12. 2 0 5 5 30 Q ATD 1. Refer to Figure A-1 for explanation of descriptions and symbols. 2. Soil descriptions and stratum lines are interpretive and actual changes may be gradual. 3. USCS designations are based on visual manual classification (ASTM D 2488) unless otherwise supported by laboratory testing (ASTM D 2487). 4. Groundwater level, if indicated, is at time of drilling (ATD) or for date specified. Level may vary with time. S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8 S-9 • Water Content in Percent �1f Jt� WSB? 17818-00 2112 Figure A-B F L APPENDIX B GEOTECHNICAL LABORATORY TESTING PROGRAM Hart Cromer 17818-00 March 9,2012 DRAFT I APPENDIX B LABORATORY GEOTECHNICAL TESTING PROGRAM A geotechnical laboratory testing program was performed for this study to evaluate the basic index and geotechnical engineering properties of the site soil. Disturbed soil samples were tested. The tests performed and the procedures followed are outlined below. Soil Classification Field Observation and Laboratory Analysis. Soil samples from the explorations were visually classified in the field and then taken to our laboratory where the classifications were verified. Field and laboratory observations include density/consistency, moisture content, and grain size and plasticity estimates. The classification of selected samples were checked by grain size analysis laboratory tests. Classifications were made in general accordance with the Unified Soil Classification (USC) System, ASTM D 2487, as presented on V Figure B-1. Water Content Determinations Water content was determined for samples recovered in the explorations in general accordance with ASTM D 2216, as soon as possible following their arrival in our laboratory. The results of these tests are plotted at the respective sample depth on the exploration logs. In addition, water contents are routinely determined for samples subjected to other testing. These are also presented on the exploration logs. Grain Size Analysis (GS) Six grain size distribution tests were completed on representative samples in general accordance with ASTM D 422. Wet sieve analysis was used to determine the size distribution greater than the U.S. No. 200 mesh sieve. The results of the tests are presented as curves on Figures B-2 and B-3 plotting r percent finer by weight versus grain size. L Hart Crowser 17818-00 March 9. 2012 L:\Iobs\1781800\Geo Eng Design Study\Draft\S 320th Intersection Report.doc DRAFT Page B-1 Unified Soil Classification (USC) System Soil Grain Size Size of Opening In Inches Number of Mesh per Inch US Standard Grain Size in Millimetres N N W N R W C M Cn M r M V CD O CD O O N W O W N O O M O W W 7 M N O O O O O O O O O O N O O O O I I I I O O 0 0 O O O O O W W R M O O O W W 7 M N �'• M N N '" Cq t0 ? q N W W O O R O M O N W W 'r M O - O O O O O O O O N O 00 O Grain Size in Millimetres COBBLES GRAVEL SAND SILT and CLAY Coarse -Grained Soils Fine -Grained Soils Coarse -Grained Soils G W G P G M G C S W S P S M S C Clean GRAVEL <5%fines GRAVEL with >12%fines Clean SAND <5% fines SAND with >12%fines GRAVEL >50% coarse fraction larger than No. 4 SAND >50% coarse fraction smaller than No. 4 Coarse -Grained Soils >50% larger than No. 200 sieve pe0 >4 for G W (D3 )2 GWand SW D70 >6 for SW &1< D xD <_3 10 6 G M and S M Atterberg limits below Aline with PI <4 G P and S P Clean GRAVEL or SAND not meeting requirements for G W and S W G C and S C Atterberg limits above A Line with PI >7 Coarse -grained soils with percentage of fines between 5 and 12 are considered borderline cases requiring use of dual symbols. D10, D30, and Ds0 are the particles diameter of which 10, 30, and 60 percent, respectively, of the soil weight are finer. Fine -Grained Soils 60 50 axi 40 v 30 N lQ a 20 10 0 ML CL OL MH CH OH Pt SILT CLAY Organic SILT CLAY Organic Highly Organic Soils with Liquid Limit <50% Soils with Liquid Limit >50% Soils Fine -Grained Soils >50% smaller than No. 200 sieve CH C L MHorOH CL -ML ML or O L 0 10 20 30 40 50 60 70 80 90 Liquid Limit SRF Grain Size (B-1).°dr3r06 ArN 60 50 40 30 20 10 0100 HA. f.rROWSER 17818-00 2112 Figure B-1 4k CITY OF �=� RECEIVED Federal Way NOV 2 6 2012 MASTER LAND USE APPLICATION DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES 33325 81h Avenue South Federal Way, WA 98003-6325 253-835-2607; Fax 253-835-2609 w ww.cityoffedcmtw4y.corn CITY OF FEDERAL WAY / I�11 CDS rr^ APPLICATION NO(s) —1 � — 10 5.313 6 — -S ✓ Date Project Name -Sowfi� '� 2c� t� S`free c,i- 2©+� ve�K-e S©, fi Htersec-+/ p" p (,oveweoT Property Address/Location S, 3 Z O+�` S+ X Z© -f ' /4c,,e S Parcel Number(s) lZt t,f n+ Way Project Description ir + V1 'Fr r 5F-C-+a PI.FASF PRINT Type of Permit Required Annexation Binding Site Plan Boundary Line Adjustment Comp Plan/Rezone Land Surface Modification Lot Line Elimination Preapplication Conference Process I (Director's Approval) Process II (Site Plan Review) Process III (Project Approval) Process IV (Hearing Examiner's Decision) Process V (Quasi -Judicial Rezone) Process VI SEPA w/Project SEPA Only Shoreline: Variance/Conditional Use Short Subdivision _ Subdivision Variance: Commercial/Residential Required Information Zoning Designation _/L�Comprehensive Plan Designation at �l k Value of Existing Improvements alue of Proposed Improvements International Building Code (IBC): A(A Occupancy Type IVA Construction Type Applicant Name: (; r t a 1 V o lae r"i-5 Address: 3.3 3 z,5- Vf l ALw- S City/State.: Feo( era I �a �j Zip: � goo 3 �.1 Phone: - g 3 -57- 2 7 Z 3 Fax: -gas 2 09 Email: &Qcvo, r'obeC' gc-, @ r�I�wzu.�owi Signature:6� 4WJ Agent (if a:FF _e .., �. ".,'i Name: Address: City/State Zip: Phone: Fax: Email: Signature: Owner Name: C , f Fe de rcc I [-(I Address: 3-5 S''" r 1-C S City/State: Fe4r,109-ct,I C-Vo'v r vA °1S003 Zip: ct g�3 Phone: 2 3 g 3 S 2 7 Z 3 Fax: 2 5-3- S53S- -2,70� Email: brtrcr-I eACrt(L'1,�c�. r "-1 Signature: �1 � a Bulletin #003 -January 1, 2011 Page 1 of 1 k:\Handouts\Master Land Use Application