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18-103384 CITY OF CITY HALL Ahh, 33325 8th Avenue South .. ..., Federal Way Federal Way,WA 598003-6325 3)8335-7000 Centered on Opportunity wwwcityoffederalway.com Jim Ferrell, Mayor Deok Dapp October 26,2018 3510 SW 318th Ct Federal Way, WA 98023 RE: Permit#18-103384-00-AD; Dapp,3510 SW 318th Ct,Federal Way Dear Mr. Dapp: After receiving your Indemnification and Release Form,the City of Federal Way's Community Development Department has completed reviewing your request to remove hazardous trees near the subject property above. Included below is our decision on your request and details on our approval. ANALYSIS Federal Way Revised Code(FWRC) 19.120.020 states that no person shall remove any trees on a site without first obtaining approval of a tree retention plan by the director,except for those activities that are exempt as described in FWRC 19.120.030, including removal of hazardous trees. We came to the conclusion of the trees being hazardous through photos provided by the applicant and a recommendation from a certified arborist. DECISION Because the trees are on city property, we had to have the Parks and Recreation Department review the request. We have received information that they have no problem with you removing the trees as long as the stumps were not removed. The email memo regarding this decision by the Parks and Recreation Department is enclosed. As stated in the application,the trees in question are a danger to the residence on the property.The trees in question are on Parks Department property; however,the applicant signed an Indemnification and Release Form given to them by the city and is therefore liable for any damage caused by the potential removal. Since hazardous trees may be removed and the applicant has provided all necessary documentation to remove the trees,the requested removal of trees near 3510 SW 318th Court is hereby approved. CLOSING Be advised that this approval is applicable to the maintenance proposed on July 31,2018. Submittal to the city and any expanded scope of work should be verified for exemption status. Please feel free to contact me at riley.bushnell@cityoffederalway.com,or(253) 835-2622, if you have any questions regarding this letter,or the city's tree retention policy. Sincerely, ,....7.74....4.4.4....., Riley Bushnell JJ Planning Intern enc: Memo from Parks and Recreation 18-103384-00-AD Doc.ID.78391 CITY Of ,�. Federal Way Parks and Facilities Division Date: October 19, 2018 To: Doc Hansen From: Jason H. Gerwen, Parks & Facilities Manager Subject: Project #: 18-103384-00-AD; Deok Tree Removal The Evergreen Arborist, Inc. inspected two Douglas Fir Trees on City of Federal Way Lochaven open space property behind 3510 SW 318th Court, Federal Way, WA 98023 at the expense of Mr. Brian Dapp. Mr. Dapp is requesting permission to remove these two Douglas fir trees on City of Federal Way property at his expense. After reading The Evergreen Arborist, Inc. observations and recommendations, I made a site visit to verify concurrence the morning of October 18th, 2018. After visual and physical inspection, I concur with the recommendation to remove these two Douglas fir trees with a couple of conditions. Upon removal of the two significant Doulas Fir trees the City requires that the bottom 15'— 20'of the trunk are left as habitat; additionally leaving the trunks intact aids in the hillside stabilization. Directly adjacent to the two large Doug Fir trees are four (4) insignificant, "bean pole" Douglas Firs that should be removed at the same time. This condition is made because they show signs of rot at the base and would cause future hazard to the private property. Now is the time to remove before they become a problem and more costly to remove. Lastly, a completed, notarized Release and Indemnification Form must be completed and on file with the City prior to any removal. CC — Steve Ikerd, Parks Deputy Director T. 1 a OCT 2 3 2018 CITY O F U:P .L WAYRECfnSeANll`IND MNIFICATION THIS RELEASE AND INDEMNIFICATION (the "Release") by De0Sic D 0p ("Indemnifier") in favor of the CITY OF FEDERAL WAY, its directors, officers, employees, agents, and volunteers ("City"). Whereas, Indemnifier desires to perform the activity described below ("Activity") on hear 3510 5w 316-'L, (t ("Property"), which is owned by the City; Activity: t t-e.� re m o v q Whereas, the City has granted permission for the Indemnifier to access, enter upon and use the Property for purposes of this Activity on _,_[DATE, if restricted] ; Whereas, Indemnifier has agreed to use reasonable care to prevent damage to said Property; Whereas, Indemnifier hereby agrees to minimize obstruction to members of the public that wish to use the recreational facilities in the Property; and Now, therefore, Indemnifier does hereby freely, voluntarily, and without duress execute this Release under the following terms: 1. Release and Indemnification. Indemnifier and Indemnifier' affiliates release and indemnify the City from any and all liability, claims, actions and demands of whatever kind or nature, either in law or equity, by any persons or entities, including without limitation, their respective agents or representatives, including costs and attorney fees, which arise or may hereafter arise from Indemnifier's and Indemnifier's affiliates' acts, errors, or omissions in connection with the use of the Property for the Activity. 2. Other. Indemnifier expressly agrees that this Release is intended to be as broad and inclusive as permitted by the laws of the State of Washington, and that this Release shall be governed by and interpreted in accordance with the laws of the State of Washington. Indemnifier agrees that in the event that any clause or provision of this Release shall be held to be invalid by any court of competent jurisdiction, the invalidity of such clause or provision shall not otherwise affect the remaining provisions of this Release which shall continue to be enforceable. Indemnifier has had the opportunity to have this Release reviewed by an attorney and has fully read and understands the terms and provisions of this Release. IN WITNESS WHEREOF, Indemnifier 1 DATE: 10- a3- Ig STATE OF WASHINGTON ) ss. COUNTY OF -,n ) On this day personally appeared before me, Deo`2. C)0.QL) , to me known to be the individual described in and who executed the foregoing insthment, and on oath swore that she executed the foregoing instrument as her free and voluntary act and deed for the uses and purposes therein mentioned. GIVEN my hand and official seal this or-1-3 rd day of ,2012. 041 (typed/prin�etl name-ef notary) Notary Public in and for the State of Washington. My commission expires 0- K:/forms/Release indem—FORM.doc 1.4> /9•. TA = i� NO = PUBLIC : z - �5�.•` RESUBMITTED The Evergreen Arborist, Inc. SEp 2 y 2018 DENNIS L. TOMPKINS ISA Certified Arborist PN-0496A--Consulting Urban Forester CATY u ERAL DEVELOP ISA Qualified Tree Risk Assessor (ISA=bderruatioual Society ofArboriculture) 10711 164th Ave.Ct.E.,Bonney Lake,WA 98391 Phone:253 863-7469-Email:dlta blar<_.net Website:evergreen-arborist.com September 20,2018 Brian Dapp 3510 SW 318th Court Federal Way, WA 98023 Dear Mr. Dapp: Thank you for inviting me to assist with your tree concerns. I inspected the 2 Douglas-fir trees on September 15,2018 in the presence of you and Mrs.Dapp. I had a brief conversation with Riley Bushnell verifying a request for a hazard assessment by a Certified Arborist. This follows up an approval by the City for removal of the two subject trees in Mr. Bushnell's letter of August 24,2018. Observations: The trees of concern are two Douglas-fir trees located on City property. Both trees are presently in fairly good condition. However,they both have some defects of concern plus the fact that direction of the prevailing winds from the sound would likely blow any debris toward your property. The tree closest to your property has a healthy upper canopy. It does have numerous dead branches that likely will eventually break off. Based upon your plans,the proposed fence and new landscaping could be targets. The chances of an entire tree failure are low at present. Overall,the tree could be rated as a moderate hazard based upon the location and number of dead branches along the trunk. The second tree, located nearby,was difficult to observe because of the blockage of the branches from the first tree plus the fact the trunk is almost entirely encased with ivy. There did appear to be some branches in the uppermost canopy,but most of the lower ones had likely been "smothered"by the vegetation. While ivy does not directly kill or feed off the trees,the weight of its foliage can break off branches that are covered with the vegetation. While the tree does not appear to be an imminent threat of failure,the long-term health and safety is questionable. Recommendations: The trees are considered to be moderate hazards over the long term. For maximum peace of mind and safety,removal is recommended. Regarding the neighbor's trees,I recommended retaining all since they are in good condition and are important for the stability of the slope. There is no guarantee that an act of God will not cause some type of branch or tree failure in the future of the trees that were examined. Since these occurrences are unpredictable, arborists are unable to accept responsibility for such events. We offer our best opinions based on visible signs and our experience in conducting hundreds of hazard tree assessments and on-site inspections over the years. Sincerely: ,, k c� Dennis Tompkins ISA Certified Arborist PN-0496A ISA Qualified Tree Risk Assessor • REQUEST FOR ADMINISTRATIVE DECISION CITY OF �...� DEPARTMENT OF COMMUNITY DEVELOPMENT Federal Way 33325 8th Avenue South Federal Way,WA 98003-6325 253-835-2607;Fax 253-835-2609 www.citvoffederalway.com FILE NUMBER I S - I © 3 $ 4- Date S P t. 15 a2 f)I f3 Applicant NAME PRIMARY PHONE Leok V-53 -83e - g848 BDSINESS/ORGANIZATION ALTERNATE PHONE MAILING ADDRESS • E-MAIL 3 S I 0 5 w 3lg-f k C-t-, DADP(c I € o►ncas.tt nert' city STATE ZIP FAX Fedtret IWay We a. QS©g3 Property Address/Location .5 a nq P 4 5 ed., ve_. Description of Request Ha r a rd n a 4 1 to e re ryt o vet ' p C'c.tu re 5 e re v i dc°o 4vt) ctrborist P_ vaua`f'rtoVl t-t, le i) re_ trite nat6 re✓wlotia I . di List/Describe Attachments_ .. ISA Certified Arborist/Tree Risk Assessor&Urban Forester Pest Diagnosis,Damage Ap saaals,Expert Witness Hazard Tree Evaluation,Small Tree Pruning Spedalizing in Ja (253)863-7469 • dl@blarg.net www.evergreen-arborist.com For Staff Use ❑ Code Interpretation/Clarification - No Fee ❑ Critical Areas Letter/Analysis/Peer Review - No Fee(Actual Cost ifApplicable) ❑ Request for Extension(Land Use/Plat Approval) - Check Current Fee Schedule ❑ Revisions to Approved Permit - Check Current Fee Schedule Tree Removal - No Fee ❑ Zoning Compliance Letter - Check Current Fee Schedule Bulletin#079—January 4,2016 Page 1 of 1 k:\Handouts\Request for Administrative Decision nECEIVED REQUEST FOR )MINISTRATIVE DECISION COMMUNITY DEVELOPMENT DEPARTMENT 33325 8th Avenue South JUL 3 1 2018 • Federal Way Federal Way,WA 9800 CITY OF FEDERAL WAY ' 253-835-2607;Fax 253-835-2609 COMMUNfr1 DEVELOPMENT www.cityoffederalway.com FILE NUMBER - Date Ta ly 9-6 j I$ / q — / D _ 3 - I4L3 '7 - 31 - fg Applicant NAME PRIMARYPHONE OL DaePa53335- 2µ2_ (c BIISINESS//O�RGAIIlZAf`TIOR ALTERNATE PHONE 9 5 3- 8 38- fB ten �y ` MAILING ADDRESS E-1tAII K 4 R 561 e.corn ,s I.y,n } e t G7 ✓lam 1 6141 CITY Fe&.f 1X1 V�� "'l STATEa cibo ZIP � FAX Property Address/Location 3510 Su) 31at`' ct F d rtti Loa( _ Lak Description of Request e-t-wto Vt. I o Sev e1rt l .I-o t.�edl Tk'e.e /-S l < r 0 Wdel ) 7 4;1 be.r n r laittedy 1 a BIq i r7 Busks. He Itl1 1D it fl.tr1/ (a(N1 (J iN1Pk..ve, '-t t le b$ ShQa�I�N/� . .. 1 hem 5 Lei ri 1'Yyvteyea( aYe_ et a In5e.Y— -te NOI.tSC. VAQn>/ re. v✓14.Vtv e-the. 4 t- .c 1 N G a 5 I S -cm Y- now. List/Describe Attachments G-e O Ig_e_5e a 1-c.e 5 C vQ I matt'o vt o-c Sire Q I o It A Hri -L core_ cait fir S av14/ysi5 , . • — 5;kt PIc . — Ph,o4-os For Staff Use No Fee ❑ Code Interpretation/Clarification No Fee(Actual Cost if Applicable) ❑ Critical Areas Letter/Analysis/Peer Review Check Current Fee Schedule O Request for Extension(Land Use/Plat Approval) Check Current Fee Schedule ❑ Revisions to Approved Permit No Fee O Tree Removal Check Current Fee Schedule O Zoning Compliance Letter Bulletin#079—January 4,2016 Page 1 of 1 k:\Handouts\Request for Administrative Decision King County \87.31980900 / ( ,., I \\\ `3528 ff ir_. 8 731 980340 ,--------'-'7'7-- \ __,.___,_______________,...________________ \ \ / 87`3518 Jei .7 30 --,--7-7-- \ \ Nate, vtelg ----------c-- N \ ----- \ \ . �� 3'kree9 3527 ( 7 (, 873��8��18c? \ \ \ C'6' '' 5 4388000520 J f 8731 g8��3!�'_)35 10 3609 8 73198 02 70 `� `3517 ta3 :�i 8731980290 `3 504 `�. fi / 8 73 198 10 873�98,�3vo q, c a RECEIVED _o �,-# ..� ,8731 9802603507 .� JUL 31 2018 •' CRY OF FEDERAL WAY 8731902740 i.`r C COMMUNITY DEVELOPMENT -� King County Assessor's Office. King County GIS Center. King County, King county Assessor's Office. King County GIS Center The information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County Date: 7/31/2018 AN LA1King County makes no representations or warranties,express or implied,as to accuracy,completeness,timeliness,or rights to the use of such information.This document is not intended for use as a survey product King County shall not be liable for any general,special, indirect, incidental, or consequential damages including, GIS CENTER but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on this map.Any sale of this map or information on this map is prohibited except by written permission of King County. From: Ping Inquiry D!nginquiry@cityoffederalway.com e RECEIVED Subject: FW:Tree crowding == Date: July 2,2018 at 8:45 AM To: celtic0564@comcast net JUL 3 1 2018 CITY OF FEDERAL WAY COMMUNITY DEVELOPMENT Jim Harris Planner trt•w ...�. Federal Way 33325 8th Avenue South Federal Way,WA 98003-6325 Phone: 253/835-2652 Fax: 253/835-2609 www.cityoffederalway.com Office Hours Mon -Thur, 8:00 AM —4:30 PM or by appointment From: Ping Inquiry Sent: Friday, June 29, 2018 11:57 AM To: 'celtic0564@comcast.net' Subject: RE: Tree crowding Deok. The following map illustrates two geologically hazardous areas that must be examined before the city can authorize tree removal. 1. Orange=erosion hazard area 2. Pink crosshatch=landslide hazard area City code requires you to submit a geotechnical report prior to the removal of any trees. And your report may be subject to peer review at your expense to verify its findings. Please see the attached handout for more information and report requirements—share it with your engineer. When your report is ready,submit to the City's Permit Center with the attached application to request tree removal. Note: the map also illustrates a stream behind your lot,but there is adequate distance so that a stream analysis is not required for your tree removal. ki 471 ti .10k 41/4 �--Tr cp ECr r7 Cc(,R v, E ) 2 f, S t I 9-S3-bib-loll ►y.# 14.k ►-i--'In-..,.,,, ,.a.„ f.,,..v„,.t.,.. • s • 0,iftt0 ‘g 4.e4) kL11 a1 1I1,tl 1k lo,w,11i4, k1, NSiSri1\.41 ,/. I)Lakes ► ,i„l 114,1ik,4,,p14., ,li- ,,,,,,. 4,., ..--7-,, riz,,, if . Dave Van De Weghe,AICP Senior Planner 33325 8th Avenue South Federal Way,WA 98003-6325 Phone: 253/835-2638 Fax: 253/835-2609 www.cityoffederalway.com Original Message From: Permit Center Sent: Friday,June 29,2018 11:00 AM To: Ping Inquiry Cc: Permit Center Subject: FW: Tree crowding Original Message From: Jim Smith [mailto:celtic0564@comcast.net] Sent: Friday,June 29,2018 10:29 AM To: Permit Center Subject: Tree crowding Our property,located in Federal Way"Twin Lakes" (lot 8731980320) has to many trees and needs to be dealt with by removing several,trees are causing constant maintenance to our homes • s. t ♦, . 04 is ! �„� 1. ,,, • a _ . 4'7i a A��� `• ,� s> • * '''•\c., , '-- 'AO t AP' 1 k Vg., 4 2 > N 0 �J W UOW LUo 0§ a /' '.w .a r IA - :a 4 k ' • fir,. :r" ' A� .. ffww fr" `k... W- Ji d` • `' 'ram " "'_xr , , ', • f' ;is)�' 4. .1 x� vNibr 'ik ;,:M t �, ,a J ? d s. A ►sti s 1. r! 1,, .-� • ;� s" '�: - ,,,,_. ,...t.. ...\ ,. •,... . ,,•..--, -.:•,- . -,..,..." . . • . ; .. •,.. .,..„, . , . , . , . -,-, .....,,,,,,. - =.A � c a •t '` a M v. rtsk CI e 3� Ili w W4 O Cr) Wo ui J } CC oz U§ J may ` a4 1- P • 1 II.: *,. jea b n U �CI --I Ug G EO RESOU RCES earth science & geotechnical engineering 5007 Pacific Hwy E., Suite 16 I Fife, WA 98424 1253.896.1011 I www.georesources.rocks July 26, 2018 Ms. Deok Hee RECEIVED 3510 SW 318th Court Federal Way,Washington 98023 (253)838-9898 JUL 31 2018 dadh564@comcast.net CITY OF FEDERAL WAY COMMUNITY DEVELOPMENT Geologic Hazards Assessment Proposed Tree Removal 3510 SW 318th Court Federal Way,Washington PN:8731980320 Doc ID: Hee.SW318thCt.CAR INTRODUCTION This geological hazard assessment summarizes the results of our assessment for the proposed tree removal to be done at the above address. The site location is shown on the Site Location Map, Figure 1. Our understanding of the project is based on our discussions with you, our review of the City of Federal Way documents provided by you, our July 18, 2018 site visit and subsurface explorations, our understanding of City of Federal Way Revised Code (FWRC) Critical Area Ordinance and development codes, and our experience in the area. We understand you are concerned about several large trees located behind the existing residence at the site and that you propose to remove these trees in order to manage the tree density within the vicinity of the residence. We understand that you propose to remove seven trees. Two of the tree stumps will be ground and the other five tree stumps will remain in place. The City of Federal Way is requiring a critical area report to satisfy the requirements per FWRC 19.145.080 because of potential landslide hazards and erosion hazards mapped in the site area. SCOPE The purpose of our services is to evaluate the site conditions as a basis for assessing potential landslide hazards on and adjacent to the site. Specifically, the scope of services for this project included the following: 1. Reviewing the available geologic and geotechnical data for the site and site vicinity; 2. Visiting the site and performing a site reconnaissance to confirm site features; 3. Observing the subsurface conditions at the site by advancing 2 hand augers along the top of the slope at select locations across the site;and, Hee.SW318thCt.CAR July 26,2018 page 12 4. Preparing this written Geotechnical Letter (a critical areas assessment that does not include geotechnical design recommendations) to address the FWRC Critical Areas Ordinance, Title 19.145. Our scope of work was originally outlined in our July 10,2018 Proposal for Services. We received written authorization to proceed with our scope of work on July 11,2018. SITE CONDITIONS Surface Conditions The site is located at 3510 SW 318th Court in Federal Way, Washington within an area of existing residential development. Based on information obtained from the King County iMap, the parcel is generally triangular in shape, measures approximately 36 to 131 feet wide(north to south) by approximately 105 feet deep (east to west), and encompasses about 0.22 acres. The site is bounded by existing residential development to the north and south, by an undeveloped sloping open space tract to the east,and by SW 318th Court to the west. The site is currently developed with a single family residence,driveway,and associated utilities. The site generally slopes down SW 318th Court to the southeast at about 5 to 10 percent.The east portion of the site slopes down to the east at about 20 percent. The total topographic relief across the site is on the order of 7 feet. Offsite to the east, a steep slope slopes down to the east into a drainage at about 60 to 65 percent with about 60 feet of vertical relief. These slopes flatten out to about 20 percent at the bottom of the slope and in the area of the stream. The existing residence is located about 40 to 49 feet away from the top of the slope. The existing site conditions and topography of the site are shown on the Site Vicinity Map, Figure 2. Vegetation across the site generally consists of landscape grass, trees, and small shrubs. Vegetation on the slope area consists of a moderately dense stand of coniferous and deciduous trees with a moderately dense to dense understory of huckleberry, ivy, and other native and invasive species. The trees to be removed are located on the flatter, eastern portion of the site, near the top of the slope. All the trees are larger coniferous species. The drip line and canopy overhangs the top of the steep slope area. No evidence of recent or ongoing erosion, mass wasting, seeps or springs, or deep-seated slope instability were observed at the site during our visit. Site Soils The USDA Natural Resource Conservation Service (NRCS) Web Soil Survey maps the site as being underlain by Everett very gravelly sandy loam (EvC)soils and the slope below the site as being underlain by Alderwood Kitsap (AkF) soils. The Everett soils are derived from sandy and gravelly glacial outwash and form on slopes of 8 to 15 percent. These soils have a "moderate" erosion hazard and are included in hydrologic soils group A. The Alderwood Kitsap soils are derived from lake deposits and form on very steep slopes. These soils have a "severe to very severe" erosion hazard and are included in hydrologic soils group B. A copy of the NRCS soils map for the site vicinity is attached as Figure 3. Site Geology The draft the Geologic Map of the Tacoma North 7.5-minute Quadrangle, Washington (Booth et. Al, in review) indicates the site is in an area underlain by recessional outwash (Qvr) and advance I111 GEORESOURCES • Hee.SW318thCt.CAR July 26,2018 • page 3 outwash (Qva) soils. These glacial soils were deposited during the Vashon Stade of the Fraser Glaciation, some 12,000 to 15,000 years ago. The outwash soils consist of a poorly sorted, lightly stratified mixture of sand and gravel that may contain localized deposits of clay and silt that were deposited by meltwater streams emanating from the retreating and advancing ice mass. The recessional outwash deposits are considered normally consolidated and offer moderate strength characteristics. The advance outwash was subsequently over-ridden by the continental ice mass,and as such, is considered to be over consolidated and generally exhibits high strength and low compressibility characteristics, where undisturbed. No areas of landslide deposits or mass wasting are mapped within the immediate vicinity of the site. An excerpt of the above referenced geologic map is included as Figure 4. Subsurface Explorations On July 18, 2018, a field representative from GeoResources, LLC (GeoResources) visited the site and observed the shallow subsurface conditions by advancing two hand auger explorations to depths of 4 to 51 feet below the existing ground surface, logged the subsurface conditions encountered in each hand auger, and obtained representative soil samples. The number and location of the hand augers was selected in the field based on project information provided by you at the time of excavation, our understanding of the proposed tree removal, consideration for underground utilities, existing site conditions, and current site usage. Each hand auger exploration was backfilled with the excavated soils and was tamped, but not otherwise compacted. The subsurface explorations excavated as part of this evaluation indicate the subsurface conditions at specific locations only, as actual subsurface conditions can vary across the site. Furthermore, the nature and extent of such variation would not become evident until additional explorations are performed or until construction activities have begun. Based on our experience in the area and extent of prior explorations in the area, it is our opinion that the soils encountered in the explorations are generally representative of the soils at the site. The approximate locations of the hand augers are indicated on the attached Site and Exploration Map, Figure 3. The soils encountered were visually classified in accordance with the Unified Soil Classification System (USCS) and ASTM D: 2488. The USCS is included in Appendix A as Figure A-1,while the descriptive logs of our test pits are included as Figure A-2. Subsurface Conditions The subsurface conditions observed in our hand auger explorations were relatively uniform and generally confirmed the mapped stratigraphy at the site. Our explorations generally encountered '/to 1 1 feet of topsoil mantling 1 1 to 31 feet of light brown to grey loose to medium dense, moist silty sand with gravel. These soils were encountered to the full depth explored in Hand Auger HA-1 and appear to be consistent with fill material associated with the original grading of the site. Underlying these soils in Hand Auger HA-2, we encountered golden brown sand with silt and some gravel in a loose and moist condition to the full depth explored. We interpret these soils to be consistent with recessional outwash soils. Groundwater Conditions No groundwater seepage was observed at the time of our site visit; however, iron oxide staining was observed in Hand Auger HA-1. We anticipate that perched groundwater may developed atop the glacial till soils at the site during the wet season. Perched groundwater develops when GEORESOURCE Hee.SW318thCt.CAR July 26,2018 page 4 infiltration through a shallow, more permeable soil, is slowed at depth by a deeper less permeable soil layer. We anticipate fluctuations in the local groundwater levels will likely occur in response to precipitation patterns,off site construction activities, and site utilization. CONCLUSIONS Based on our site evaluation, it is our opinion that the proposed tree removal at the site is feasible from a geotechnical standpoint. While the slope east of the site is identified by the City as a potential landslide hazard area, it is our opinion that an active landslide hazard area does not exist at the site. We understand that two of the stumps will be ground down while the remaining tree stumps will be left in place. To minimize the potential of erosion of any exposed or bare soils at the site, recommend that some type of groundcover be planted in these areas. Specific recommendations are included below. Erosion Hazard Areas per Federal Way Revised Code The FWRC, Chapter 19.05.070.G(1)defines erosion hazard areas as"those areas identified by the U.S. Department of Agriculture's(USDA) Natural Resource Conservation Service(NRCS)as having a moderate to severe or severe to very severe rill and inter-rill erosion hazard due to natural agents such as wind, rain, splash, frost action or stream flow; those areas containing the following group of soils when they occur on slopes of 15 percent or greater: Alderwood-Kitsap ("AkF"), Alderwood gravelly sandy loam ("AgD"), Kitsap silt loam ("KpD"), Everett("EvD"), and Indianola ("InD"); and those areas impacted by shore land and/or stream bank erosion" As previously stated,the site soils are mapped as Everett very gravelly sandy loam (EvC)and Alderwood-Kitsap (AkF). The Alderwood-Kitsap soils (AkF), which meet the definition of an erosion hazard in accordance with the FWRC Chapter 19.05.070.G1, are mapped along the steep slope to the east of the site. Per the FWRC Chapter 19.145.240, erosion hazard areas do not contain standard buffers,therefore no buffers should be imposed by the City. Conventional construction BMP's should be installed prior to beginning construction. This will provide adequate erosion control for the disturbed areas of the site. It is critical that the installed erosion control measures be monitored and maintained, and if necessary modified based on changing site conditions. In the event that the site is not worked for 7 days or more, the disturbed areas should be adequately erosion protected and maintained in the event of a significant storm event. This may include the use of plastic sheeting or mulch. Erosion control should specifically include the installation of silt fencing along the downslope and side slopes of the active construction area. Straw waddles and berms may also be necessary. Provided standard BMP's are installed prior to beginning construction, the potential for erosion or sediment leaving the site should be minimal. Landslide Hazard Areas per Federal Way Revised Code The FWRC, Chapter 19.05.070.G(2) defines landslide hazard areas as"those areas potentially subject to episodic downslope movement of a mass of soil or rock including but not limited to the following areas." These are typically characterized as having the following indicators: a. Any area with a combination of. i. Slopes greater than 15 percent; GEORESOURCES ' Hee.SW318thCt.CAR July 26,2018 • page IS ii. Permeable sediment overlying a relatively impermeable sediment or bedrock; iii. Springs or groundwater seeps. b. Any area which has shown movement during the Holocene epoch,from 10,000 years ago to the present, or which is underlain by mass wastage debris of that epoch. c. Any area potentially unstable as a result of rapid stream incision,stream bank erosion or undercutting by wave action. d. Any area located in a ravine or on an active alluvial fan,presently or potentially subject to inundation by debris flows or flooding. e. Those areas mapped as Class U(unstable), UOS(unstable old slides), and URS(unstable recent slides)by the Department of Ecology's Coastal Zone Atlas. f. Areas designated as quaternary slumps, earthflows, mudflows, lahars, or landslides on maps published by the U.S. Geological Survey or Washington State Department of Natural Resources. g. Slopes having gradients greater than 80 percent subject to rockfall during seismic shaking h. Any area with a slope of 40 percent or steeper and with a vertical relief of 10 or more feet except areas composed of consolidated rock.A slope is delineated by establishing its toe and top and is measured by averaging the inclination over at least 10 feet of vertical relief. The site has slopes steeper than 15 percent, but no adverse or intersecting contacts are mapped on the site, nor were any seeps or springs, commonly indicative of adverse contacts, observed on the slope below the proposed tree removal area. No areas of mapped landslide debris or activity were noted on the published USGS geologic map or coastal zone atlas. A stream is mapped to the east of the site; however, this does not seem to be prone to rapid stream incision. No areas of alluvial fans are mapped nor were any alluvial fans noted in the vicinity of the site at the time of our past site visits. The site slopes are not steeper than 80 percent with more than 10 feet of vertical relief and are not subject to rock fall during seismic shaking. Slopes steeper than 40 percent are mapped in the upper portion of the site, near the top of the slope. Based on our observations and literature review, the site has one of the above indicators (slopes steeper than 40 percent with 10 feet or more of vertical relief); however,we did not observe any evidence of landslide activity at the site during our site visit. Erosion Control While it is generally not considered prudent to denude an otherwise stable slope of its vegetation, it is possible through diligent erosion control practices to remove large trees that pose hazards to structures and still maintain a stable slope. The subject trees are not on the steep slope, rather the flatter upland area above the slope. Tree removal along the crest of the slope requires careful tree removal practices and specialized methods. To reduce the potential for erosion, we recommend the following measures be implemented to mitigate the effects of the proposed tree removal: 1. We do not recommend removal of tree stumps and rootballs on steep slope areas. Since the trees are on the flatter upland area, the removal of the two stumps should have minimal impact on the slope. We recommend grinding the stumps in place versus using a machine to mechanically remove the stump which will disturb more area. 2. Thinning or topping of trees should only be performed under the guidance of experienced arborist. GEORESOURCE Hee.SW318thCt.CAR July 26,2018 pagei6 3. Removal of the cut trees from the slope should be performed in a manner that prevents the trees and branches from falling onto or adversely affecting existing vegetation cover on the • adjacent slope,which is off of your property. 4. Once the trees have been cut and large debris removed from the native vegetation track,we recommend that any disturbed slope areas be revegetated to allow as much time as possible for the new vegetation to establish itself prior to the next wet weather season. 5. Areas where tree removal occurred should be mulched, replanted, or covered so as to not allow surface water to sheet flow or create preferential flow paths over the top of the slope. 6. If you are going to replant, you can use these documents as reference: Vegetation Management A Guide for Puget Sound Bluff Property Owners. (Washington Department of Ecology Publication #93-31); Slope Stabilization and Erosion Control Using Vegetation:A Manual of Practice for Coastal Property Owners (Washington Department of Ecology Publication #93- 30), and Surface Water and Groundwater on Coastal Bluffs: A Guide for Puget Sound Property Owners (Washington Department of Ecology Publication #95-107. These documents can be found online. 7. Homeowner should maintain the disturbed area for the next two wet winter seasons to ensure no concentrated sheet flow or preferential pathways develop that may adversely affect the steep slope area east of the tree removal area. LIMITATIONS We have prepared this report for use by the Ms. Deok Hee and other members of the design team, for use in the design of a portion of this project. The data used in preparing this report and this report should be provided to prospective contractors for their bidding or estimating purposes only. Our report, conclusions and interpretations are based on our observations of subsurface conditions, data from others and limited site reconnaissance, and should not be construed as a warranty of the subsurface conditions. Variations in subsurface conditions are possible and may also occur with time. A contingency for unanticipated conditions should be included in the budget and schedule. Sufficient monitoring, testing and consultation should be provided by our firm during construction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should the conditions revealed during the work differ from those anticipated,and to evaluate whether earthwork and foundation installation activities comply with contract plans and specifications. The scope of our services does not include services related to environmental remediation and construction safety precautions. Our recommendations are not intended to direct the contractor's methods, techniques, sequences or procedures, except as specifically described in our report for consideration in design. If there are any changes in the loads,grades, locations, configurations or type of facilities to be constructed, the conclusions and recommendations presented in this report may not be fully applicable. If such changes are made, we should be given the opportunity to review our recommendations and provide written modifications or verifications,as appropriate. GEORESOURCES • • Hee.SW318thCt.CAR July 26,2018 page 17 We have appreciated the opportunity to be of service to you on this project. If you have any • questions or comments, please do not hesitate to call at your earliest convenience. Respectfully submitted, GeoResources, LLC of Wash;� � o 44440 *VI olliroo".-391V-.4.1/4100 91/114N- __&11 ,1Sed Geo\o KEITH SCOTT r2017. l Jordan Kovash, GIT Keith S. Schembs, LEG Staff Geologist in Training Principal JLK:KSS/jlk Doc ID:Hee.SW318thCt.CAR Attachments: Figure 1:Site Location Map Figure 2:Site&Exploration Map Figure 3:USDA NRCS Soils Map Figure 4:USGS Geologic Map Appendix A:Subsurface Explorations GEORESOURCES _1delaide ' ' 4 fin cc crumas Bay 3 . Centre,"' � W tv r } 4-.'1.1dakle a' . Q \ Park r Dumas Bay Park SW 312th Si LJ 1. SW S' a `i - Lakota 3. a c Ili 4) Q Park N > `�, `r o ns_ .ttti rn SW 317th PI (j,' T a ci s h SW 320th St Point Park F eral r. L1_ L. I.i ti9, 3�- ay _ SW 325th PI a. Vr p L._7 r 4 ;E a IP .r• t * ^` Alderbrook • ,n C'I'rmpi= , an ~ J. i,,,V Park 4 Park n .< a ? fttr 3?9th Pi A S., ` ::1 332rid4, 330th St ri ,,, , Approximate Site Location Map created from King County Public GIS(https://gismaps.kingcounty.gov/iMap/) `\ Not to Scale Site Location Map Proposed Tree Removal 3510 SW 318th Court GE O R E S O U RC E S Federal Way, Washington earth science & geotechnical engineering PN: 8731980320 5007 Pacific Hwy E.,Suite 16 I Fife,WA 98424 1253.896.1011 I www.georesources.rocks Doc ID:Hee.SW318thCt.F JUIy 2018 Figure 1 411‘,1 • 3S2R A. ` {... � 35.27 # di q� 1 1 J .... A-2 11 t' r t S • it b 4 ‘ ,„... . . i: . . , .,,,,,. ,,,, � ,-. . t ,:- .. .t. 35. iftfr b �, , l s Ee . . Alt : 4 6 • f et•-i- .5 , U3 .r 7 •A 1 +�, -t..',ri_ Approximate Site Location Map created from King County Public GIS(https://gismaps.kingcounty.gov/iMap/) HA-1 S Approximate Number and Location of Hand Augers •\V _ w E. S Not to Scale Site & Exploration Map Proposed Tree Removal 3510 SW 318th Court GE 0 R E S O U R C E S Federal Way, Washington earth science & geotechnical engineering PN: 8731980320 5007 Pacific Hwy E.,Suite 16 I Fife,WA 98424 I 253.896 1011 I www.georesources.rocks Doc ID:Hee.SW318thCt.F July 2018 Figure 2 x t e- ger. • �' ,, . ., , ..), t: 4 : .1 A . a 4, .,. ,...4.„140 .., .....qr...„ _ , 1 AkF ' InC .',y` . , . L, § f 3 soh �i„6 EvC s� Approximate Site Location Map created from Web Soil Survey(http://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx) Soil Soil Name Parent Material Slopes Erosion Hazard Hydrologic Type Soils Group Everett very gravelly sandy Sandy and gravelly glacial EvC loam outwash 8 to 15 Moderate A InC Indianola loamy sand Sandy glacial outwash 5 to 15 Moderate to A Severe AkF Alderwood & Kitsap Soils Lake deposits Very Severe to very B steep severe t j Not to Scale NRCS Soils Map Proposed Tree Removal 3510 SW 318th Court GE Q R E S O U RC E S Federal Way, Washington earth science & geotechnical engineering PN: 8731980320 S007 Pacific Hwy E.,Suite 16 I Fife,WA 98424 1253.896.1011 I www.georesources.rocks Doc ID:Hee.SW318thCt.F July 2018 Figure 3 Qb i Qv rl,_ - / ,, �` --`Of I t-ii- \ - r 0;._.:1_,vr • QPogr QPoJ`. T •: 21 - • a Qf ,:: Qvt • i 20 , rr > ()Pic .- - o' \Qvt (i.,://,,A7". l4 1 .l Ovt �'t ��.� 7/ / Ow it , ` // A ,, ovt N Qv, . .. �Qvi1 QvIc \ 1 Qvi Approximate Site Location An excerpt of the draft the Geologic Map of the Tacoma North 7.5-minute Quadrangle by Booth, Derek B. and Troost, Kathy G. (in review) Qvr Recessional outwash Qvt Vashon glacial till Qva Advance outwash —4-/E- 1 Not to Scale USGS Geologic Map Proposed Tree Removal 3510 SW 318th Court GE O R E S 0 U R C E S Federal Way, Washington earth science & geotechnical engineering PN: 8731980320 5007 Pacific Hwy E.,Suite 16 I Fife,WA 98424 1253.896.1011 I www.georesources.rocks Doc ID:Hee.SW318thCt.F July 2018 Figure 4 Appendix A Subsurface Explorations SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS GROUP GROUP NAME SYMBOL GRAVEL CLEAN GW WELL-GRADED GRAVEL,FINE TO COARSE GRAVEL GRAVEL GP POORLY-GRADED GRAVEL COARSE GRAINED More than 50% GRAVEL GM SILTY GRAVEL SOILS Of Coarse Fraction WITH FINES Retained on GC CLAYEY GRAVEL No.4 Sieve SAND CLEAN SAND SW WELL-GRADED SAND,FINE TO COARSE SAND More than 50% SP POORLY-GRADED SAND Retained on No.200 Sieve More than 50% SAND SM SILTY SAND Of Coarse Fraction WITH FINES Passes SC CLAYEY SAND No.4 Sieve SILT AND CLAY INORGANIC ML SILT FINE CL CLAY GRAINED SOILS Liquid Limit ORGANIC OL ORGANIC SILT,ORGANIC CLAY Less than SO SILT AND CLAY INORGANIC MH SILT OF HIGH PLASTICITY,ELASTIC SILT More than 50% CH CLAY OF HIGH PLASTICITY,FAT CLAY Passes No.200 Sieve Liquid Limit ORGANIC OH ORGANIC CLAY,ORGANIC SILT 50 or more HIGHLY ORGANIC SOILS PT PEAT NOTES: SOIL MOISTURE MODIFIERS: 1. Field classification is based on visual examination of soil Dry- Absence of moisture,dry to the touch in general accordance with ASTM D2488-90. Moist- Damp,but no visible water 2. Soil classification using laboratory tests is based on ASTM D2487-90. Wet- Visible free water or saturated,usually soil is obtained from below water table 3. Description of soil density or consistency are based on interpretation of blow count data,visual appearance of soils,and or test data. Unified Soils Classification System Proposed Tree Removal 3510 SW 318th Court GE O R E S O U RC E S Federal Way,Washington earth science & geotechnical engineering PN: 8731980320 5007 Pacific Hwy E.,Suite 16 I Fife,WA 98424 1253.896.1011 I www.georesources.rocks DocID:Hee.SW318thCt.F July 2018 Figure A-1 Hand Auger HA-1 • • Location:Southeast corner of parcel Approximate Elevation: 226' Depth (ft) Soil Type Soil Description 0.0 - 0.5 - Light brown/gray silty SAND with gravel and high organic content(loose, moist)(topsoil) 0.5 - 4.0 SM/SW Light brown/gray silty SAND with gravel(medium dense, moist)(fill?) Terminated at 4 feet below ground surface. No caving observed at the time of excavation. No groundwater seepage observed. No mottling observed;some iron oxide staining at 4 feet below ground surface. Hand Auger HA-2 Location: Northeast corner of parcel Approximate Elevation:221' Depth(ft) Soil Type Soil Description 0.0 - 1.5 GP Light brown/gray silty sandy GRAVEL(medium dense, moist)(top soil?Fill?) 1.5 - 3.0 SM/SW Light brown/gray silty SAND with gravel(loose to medium dense, moist)(fill?) 3.0 - 5.5 SP Golden brown poorly-graded SAND with silt and trace gravel (loose, moist)(recessional outwash) Terminated at 5.5 feet below ground surface. No caving observed at the time of excavation. No groundwater seepage observed. No mottling observed. Logged by: ND Excavated on:July 18, 2018 Hand Auger Logs Proposed Tree Removal 3510 SW 318th Court G E O R E S 0 U R C E S Federal Way, Washington PN: 8731980320 earth science & geotechnical engineering S007 Pacific Hwy E.,Suite 16 Fife,WA 98424 1253.896.1011 I www.georesources.rocks DocID:Hee.SW318thCt.F July 2018 Figure A-2