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17-102775Leila Willoughby -Oakes From: Leila Willoughby -Oakes Sent: Thursday, November 02, 2017 4:37 PM To: 'mehlhomes' Cc: Permit Center; Brian Davis Subject: Critical Area Concurrence (File: 17-102775-00-SF) Attachments: 110217 Mehl KC Short Plat Lot 6-Approved Wetland Assessment.pdf Dear Mr. Mehl, Planning staff requested a critical area report per FWRC 19.145.410(2)Il1; there are no existing land use records on file (the King County Engineering Subdivision was approved in approx. 1969). Staff also note there are known drainage issues in the vicinity per Public Works and a mapped erosion hazard area within 50 ft. of the project site. As such we conducted a site visit on June 14. On October 13, 2017, the city requested additional information and fieldwork documentation (i.e. field data sheets) to complete their review. We received the revised report on October 18, 2017 prepared by and Aquatic, Environmental Consulting (dated July 25, 2017). The city hereby concurs with your wetland and stream assessment report in that no wetlands or streams exist on tax parcel 302104-9182. Wetland identification and delineation reports are valid for five years; after such date the city shall determine whether a revision or additional assessment is necessary as site conditions may change over time (FWRC 19.145.410). This assessment is valid until October 17, 2022. To schedule a tree protection fencing inspection before construction call 253-835-2644 or email Leila.Willvughby- Oakes@cityoffederalway.com. Planning has signed off on the building permit. To check the building permit status and other department review - contact the Permit Center at 253-835-2607 or permit.center@cityoffederalway.com. Let me know if you have any questions. Kind regards, L. Willoughby -Oakes Associate Planner c.* r v Federal Way 33325 8th Avenue South Federal Way, WA 98003-6325 Phone:253/835-2644 Fax: 253/835-2609 www.citvoffederalway.com NOTICE: All emails, and attachments, sent to and from the City of Federal Way are public records and may be subject to disclosure pursuant to the Public Records Act (RCW 42.56) Ill Evaluation. If the city determines that a wetland may exist on or within 225 feet of the subject property, the director may require the applicant to submit a wetland report prepared by a qualified professional. From: Rob Van Orsow Sent: Wednesday, May 03, 2017 3:52 PM To: Leila Willoughby -Oakes Cc: Cole Elliott Subject: 17-101596-00-U P Good afternoon, Leila, Thanks for sharing the plan set for this new facility. The enclosure size appears to exceed current FWRC requirements, and as designed it should be just adequate in size for this use. If it could possibly be 3 or even 4 feet wider, it would provide some flexibility for container (carts vs. dumpsters). The enclosure location is readily accessible by the occupant. Enclosure access for service vehicles will be tight, but based on site orientation it appears the enclosure is in the best location given constraints posed by the drive -through feature. As long as code permits the enclosure structure being that close to the side lot line (northwest lot line), the layout should work. As we discussed, the enclosure should not be blocked with designated parking spaces situated directly in front of the enclosure's opening/gate. As shown in the various plans submitted, it appears that this has already been taken into consideration in the design. I'll return the plan set to you (but keep the cover for my notes). Thanks again, Rob To: Brian Davis Subject: Permit # 17-102775-00-SF Brian, While I have your email, I would like to know under what code # this wetland report is required I think this starts at 19.145.210 and refers to a geotechnical report in 19.145.250 but I can't anything on wetland reports. Steve Mehl Leila Willoughby -Oakes From: Leila Willoughby -Oakes Sent: Thursday, November 02, 2017 8:13 AM To: Brian Davis Cc: Robert Hansen; Ann Dower Subject: RE: Permit # 17-102775-00-SF Hi Brian, The footprint did not change after Sept. What do I need to get done: I can call Mr. Mehl when I issue the critical area letter and sign off on the permit. Condition the permit regarding trees in the drain -field. How can I add value? I will advise Mr. Mehl might want to put extra SWM controls in later, and ask Doc if we can speak with Scott regarding addressing tax parcel 3021049174's driveway and parking area expansion without permits to reduce flooding in the winter on this new house and the abutting parcels? What do you think Ann? Cheers, L. Willoughby -Oakes Associate Planner 33325 8th Avenue South Federal Way, WA 98003-6325 Phone: 253/835-2644 Fax: 253/835-2609 www.cit offederalway.com NOTICE: All emails, and attachments, sent to and from the City of Federal Way are public records and may be subject to disclosure pursuant to the Public Records Act (RCW 42.56) -----Original Message ----- From: Leila Willoughby -Oakes Sent: Thursday, November 02, 2017 7:42 AM To: Brian Davis Cc: Robert Hansen Subject: RE: Permit # 17-102775-00-SF Hi Brian, The applicant submitted the requested data field sheets on October 18th. I have drafted a city critical area concurrence letter and I am reviewing it before it goes out, now the requested information is in. I am reviewing how the proposed drain field will impact the trees proposed to be retained -the building footprint shifted from the first submittal. Plan sheets per various departments were resubmitted in July, August, October and September. Development Services approved the plans mid -September. I believe moving forward all unplatted lots should be required to provide a professional survey for inspections as we are doing a lot of infill. I would note Mr. Mehl will face drainage problems per PW-in this area people have expanded driveways/impervious surfaces without permits. With thanks, Leila L.Willoughby-Oakes Associate Planner City of Federal Way Direct: 253-835-2644 From: Brian Davis Sent: November 1, 2017 4:08 PM To: Leila Willoughby -Oakes Cc: Robert Hansen Subject: FW: Permit # 17-102775-00-SF Leila, What is the status of this permit? Brian From: mehlhomes mailto:mehlhomes aol.com] Sent: Wednesday, November 01, 2017 4:07 PM To: Brian Davis Subject: Re: Permit # 17-102775-00-SF Brian, I still don't have any notice of permit approval. Applied on June 9, 2017. That totals 145 days. Mehl Homes Inc. Steve Mehl -----Original Message ----- From: Brian Davis <.B ria n. DavJs@ cit offederalwa .com<maiIto:Brian.Davis Pcityoffederalwa .cam» To: 'mehlhomes' <mehlhomes aol.com<mailto:mehlhomes aol.com>> Sent: Fri, Oct 13, 2017 4:47 pm Subject: RE: Permit # 17-102775-00-SF Steve, The applicable code section is 19.145.410(2). Brian From: mehlhomes maiito:mehlhomes aol.com<mailto:mehlhomes aol.com?>] Sent: Friday, October 13, 2017 4:10 PM z Leila Willoughby -Oakes From: Leila Willoughby -Oakes Sent: Thursday, November 02, 2017 4:37 PM To: 'mehlhomes' Cc: Permit Center; Brian Davis Subject: Critical Area Concurrence (File: 17-102775-00-SF) Attachments: 110217 Mehl KC Short Plat Lot 6-Approved Wetland Assessment.pdf Dear Mr. Mehl, Planning staff requested a critical area report per FWRC 19.145.410(2)111; there are no existing land use records on file (the King County Engineering Subdivision was approved in approx. 1969). Staff also note there are known drainage issues in the vicinity per Public Works and a mapped erosion hazard area within 50 ft.'of the project site. As such we conducted a site visit on June 14. On October 13, 2017, the city requested additional information and fieldwork documentation (i.e. field data sheets) to complete their review. We received the revised report on October 18, 2017 prepared by and Aquatic, Environmental Consulting (dated July 25, 2017). The city hereby concurs with your wetland and stream assessment report in that no wetlands or streams exist on tax parcel 302104-9182. Wetland identification and delineation reports are valid for five years; after such date the city shall determine whether a revision or additional assessment is necessary as site conditions may change over time (FWRC 19.145.410). This assessment is valid until October 17, 2022. To schedule a tree protection fencing inspection before construction call 253-835-2644 or email Leila.Willough4-- ❑akes@citvoffederaiwa_v-com. Planning has signed off on the building permit. To check the building permit status and other department review - contact the Permit Center at 253-835-2607 or permit.center@cityoffederalway.com• Let me know if you have any questions. Kind regards, L. Willoughby -Oakes Associate Planner Federal Way 33325 8th Avenue South Federal Way, WA 98003-6325 Phone:253/835-2644 Fax: 253/835-2609 www.cityoffederalway.com NOTICE: All emails, and attachments, sent to and from the City of Federal Way are public records and may be subject to disclosure pursuant to the Public Records Act (RCW 42.56) 111 Evaluation. If the city determines that a wetland may exist on or within 225 feet of the subject property, the director may require the applicant to submit a wetland report prepared by a qualified professional. E" Evaluation. If the city determines that a wetland may exist on or within 225 feet of the subject property, the director may require the applicant to submit a wetland report prepared by a qualified professional. •uad OE:ZT-we g woaj Aepla3 pue Aepsanl Aaana AInp uo aauueld aqj se (auall slgl le palnpaq:)s aq uea sjuauajulodde aagjo ou -a-l) aeolo pue @oil sl alnpagas AA quealldde aqj jo asuadxa aqj le Malnaa Abed palq; a of jaafgns agAew :podai eaae Iealjlaa-aajIal Malnaa aq} ul pue iajunoa aq} aano noA of Alsnolnaad pauoljuaw sy •(IsiSololq noA aol uoipas apoa aqI pajull an,I) sliodai eaae lealIlaa aol sluawaalnbai wnualulua aqj uo suollsanb Aue aneq noA jl moul aw jal •I pue uuy uaoaJ aaj}al Malnaa lealugaal aqj ul paIeIS seM slgl -A:padoid jaafgns aqj jo •I} SZZ ulgllm ao uo Tslxa Aew sauluaaa;ap Alp aq} Jl uoljeuaaojul slgj apinoid o} }uealldde aqj uo sl }ooid jo uapanq aq} moul noA se — siaags e}ep play sulpnpul uoljeuaaolul leuol;lppe saalnbaa A}la aqj a}ou op I 'LTOZ 'ST aagwa}daS uo }}o pau�ls NJ AA allgnd ul uuy aag�e;� I E aged uo pa}ealpul se suollemasgo ASolojpAq pue 'silos 'uoljej@San aqj suljuauanaop uaje} paw,lopad slaags a}ep plat} asogj Sul Iloj Ileq aqj 1a9 op'aaual aq} jo peep mill pinom noAll zjsiSololq puepm noA Aq paluauanaop pue uaas sem legm (alglssaaae IOU jl) Aliodoid pafgns anoA woaj OST of OOT aqI ul apoa ino aad sainjeal allsjjo SulpieSaa („uoljeuaaojul algellene Isaq Sulsn suoljlpuoa ajeuallsa„ o} aapio ul Sulddew algdejSodoj Aluo jl) uol}euaaojul apnlaul pinogs :podai aqj @Iou osle pinom I •(uol;aas „s}lnsaa„ s,eallenby Aueduaoaae o} Allepadsa) suolsnpuoa s,ouaaw puellam aqj jo jaoddns ul (suolIIpuoa alapAq pue silos'uol}ejaSan ap Sul}uauanoop) liodai aqj jo peq aqj le shags play anlaaaa }ou pip @M •(IaM }egmauaos IIsIA ails Aw uo pue saaglo aqj uegj SulAl mol aaow 1! pue -saeaA a41 aano padolanap aneq noA eaae slgl ul sjol jo salaas a ul }ol isel anoA sl slgl) Aliadoid jaafgns aqj uo juasaid puel}am e IOU sl ao sl aaaq} jl auluaaalap 01 Aila aq} aol paau am uolleu njul aqj uleluoa }ou saop laodai aq}'Ala}eunjaojun ;,•asuac xa s,;ueall r. atj; pur juejjrnsuoa A�.ivd p.ngj s,A p aqi nq paAia1Aaa aq Tutu pue jeuorssajozd polplunb e Xq pa.Teda_id oq jpgs podw aTjZ -spore ejep/Lmjd.2up, u-edur000e pue jeuoissojoid e Xq pajedoid podw pu pom e 11uzgns jueo>jdde oqj saxrnboi uoisuTp Qup pue jW3dozd loafgns oqj jo paj SZZ urpm zo uo lsl:xa AuuT pue110m e jugj pauiuualap aneij jjels XI!D • [po3juijzadfq si sTgj] Z O [ t 917 j •6 j D dMA Jo sIuauiajinbaz uoTjv2gsanui ol!s pue podaz uinuziunu oqj ol juensznd aiodaj ea.Te jeoqTzo puejlam e Iirugns aseajd—1,ioday puvjja,4j„ •Z :pa}ejs peg aa:}al nnalnaa Alnf s,Al!:) ag; ul Z# wail '696T ul Sullleld aqj jo auall aq; }e paAanans sem 1! ains;ou ua,l -}eld IaogS 9uuaaulSu3 A}unoO SulN palep a sl 1! se inoA aai}e suol }ou ails aqj of dla} a Moo} I pue jauluaexa sueld Sulpllnq aql' (LTOZ'SZ Alnf palep) ealIenby Aq paiedaid ouaaw puel}am aq} q1y" „iJoda�1 puellaM„ aapun (LTOZ'TZ Alnf palep) aa}}al Malnaa lealugaaj aq} ul Z •ou Wall aauaaajaa ssoaa }gglua noA os LTOZ 'ST Isn9ny uo panlaaaa am slaodai eaae IeDiIp:) pagae}}e aqj pull aseald 'aual}ueow aq} ul 'LTOZ 'ST ;snSny uo panlaaaJ }aodai eaae Iealjlao aqj uo Ilewa slgl sulzuewwns japal Malnaa leuaaoj aaoua a noA Sulpuas aq Illm I •smalnaa aagjo g}lm paoSoq pue alel }o aal}}o aqI jo }no ue ul uaaq aneq I-asuodsai alel aqj uo saiSolody 'SZ aaquaajdaS uo slleuaa anoA aoj noA juegl 'lgalN •aA soullaaag jpd•Malna'{ lealugDal 9 101 dS D)l sauaoH IgaW LTTZLO .jpd-s:poda,l lgalN AS-SLLZOT-LT :sjuawpe41V 9 101 sauaoH IgaW :;:)afgnS r. Shea ue1a8 " f.. saWOgjgaW, :ol `Y' s ► Wd EVT LTOZ SET aagolao 'Aeplad :lugs: saje0-Agg6nolllM ellal i .; P sa)lep-Agtl6r (95'Zb mDd) ;oy spaooaa nflgnd aql of luensind ainsofxfp of joafgns aq Aew pue spjouaj :)flgnd aje AeM fejapaj jo AjID aql woa; pue of juas's;uawq:)eue pue'slfewa IIV :3JIlON wor eM!eaapa}}o jf3•MMM 609Z-S£8/£SZ :Xej ti179Z-S£8/£SZ:au04d SZ£9-£0086 VM'AeM leaapaJ ginos anuanV 448 SZ£££ AeM jejapaj ') aauue!d 918130SSV s9Mep-Ag4Bno!!!M 'l el!a-! 'pualaaM JeWS a aneH --� RESUBMITTED ocT 18 2017 Cr Y OF FEDERAL WAY CWMUNfTY DEVELOPMENT AQUATICA Environmental Consulting, LLC P.O. Box 308 Duvall, Washington 98019 July 25, 2017 (Rev. Oct. 17, 2017) Mr. Steve Mehl Mehl Homes, Inc. 10611 SE 291s` Street Auburn, Washington 98092 SUBJECT: Stream and Wetland Assessment REFERENCE: Parcel 3021049182, Federal Way Washington Arrppw .- PLOWil WGIA11"ft DW ot r� � #� Dade -Lv= LW4 4 Dear Steve: rx4av 4 (cam► ti Thank you for the opportunity to assist with this property. On July 12, 2017 I visited the above referenced property. The purpose of this site visit was to evaluate the property for wetlands and streams, the results of which are summarized in this letter. The subject property is a 35,801 square foot lot located near the southwestern corner of the City south of SW 356th Street. The property is located at the end of 4th Place SW on the east side of the road (Figure 1). Figure 1. Vicinity Map. Source: King County i" (King County 2017) T rilro, k r0d III ahee iddle School l— J r 1 Legend: a e Basins: Cri�iGgf AfeaG; Water Features: -- Hylebos Creek Erosion Hazard Area Lakes ~!� Laver Green River ® Landslide Hazard Areas Streams Lower Puget Sound Wetlands (i996 City Survey) Mill Creek pyr t White Riveraurine Ramemeer. A"l'r4Va L s&MME Figure 3. City of Federal Way Critical Area Map (City of Federal Way, 2016) z swa�yu, of Norparnt Way NE Q� •r.-:r. /. n . "S�O G. ' tst,LH, w Site y 529H, S t 5 W 358C . ,ry 2i011, S! '-1 r n9 356th St - l t My YNINrrif 39911t 4t w � u 1 i � m � i - sour t .'_sri HERE ❑ = INCREMENT. Figure 4. Washington Department of Fish and Wildlife Priority Habitats and Species Map Figure 5. 225 foot Buffer from Property Line RESULTS The entirety of the subject property was walked and off -site conditions were reviewed based on what could be seen from the property boundaries. The conditions on adjacent properties were visible for approximately 100 to 150 feet. Beyond this distance visibility was obscured by buildings or vegetation. However, based on best available science and a review of available background information (previous section), there is no reason to think there may be a wetland off -site within 225 feet. The 1987 Corps of Engineers Wetland Delineation Manual and applicable 2010 Supplement for the Mountains, Valley's and Coast Region guidelines were used to determine if wetland conditions were present. There are no wetlands or streams present on - site and none were visible from the property boundaries. Vegetation on the subject property and vicinity was composed almost exclusively of plants that grow in well drained soils and are categorized as "facultative upland" by the current 2016 National Wetland Plant List for the Western Mountains, Valley's and Coast Region. These included Douglas fir (Pseudotsuga menziesii), big leaf maple (Acer macrophyllum), western hemlock (Tsuga heterophylla), hazelnut (Corylus cornuta), sword fern (Polystichum munitum), salal (Gaultheria shallop), dull Oregongrape (Mahonia nervosa) and trailing blackberry (Rubus ursinus). Soil on the property was observed to be a sandy gravelly loam with a surface horizon that ranged from a very dark brown (10YR2/2) to a dark yellowish brown (10YR4/2). No signs of redoxymorphic features or hydric soils were present. No signs of wetland hydrology were seen on or near the property. A wetland data sheet was filled out for the very obvious upland forest, located near the southern end of the property near the location of the proposed home (attached). Two photographs follow that document vegetation on the site. r Ito Figure 6. Photos of Forested Vegetation layer of Douglas fir and Big Leaf Maple Produced with a Trial Version ofr--1F Annotator - www.PDFAnnotator. i WETLAND DETERMINATION DATA FORM — Western Mountains, Valleys, and Coast Region Project/Site: 3021049182 City/County: Federal Way/King Sampling Date: 7/12/2017 Applicant/Owner: Mehl Homes State: WA Sampling Point: SP#1 Investigator(s): T.Opolka Section, Township, Range: 30, 21. 04 Landform (hillslope, terrace, etc.): Slope Local relief (concave, convex, none): none Slope (%): 14% Subregion (LRR): A Lat: unknown Long: unknown Datum: n/a Soil Map Unit Name: Alderwood sandy gravellyloam, 15-30% slopes NWI classification: upland forest Are climatic / hydrologic conditions on the site typical for this time of year? Yes X No (If no, explain in Remarks.) Are Vegetation Soil or Hydrology significantly disturbed? N Are "Normal Circumstances" present? Yes_X No Are Vegetation Soil or Hydrology naturally problematic? N (If needed, explain any answers in Remarks.) SUMMARY OF FINDINGS — Attach site map showing sampling point locations, transects, important features, etc. Hydrophytic Vegetation Present? Yes No X Hydric Soil Present? Yes No X Is the Sampled Area X Wetland Hydrology Present? Yes No X within a Wetland? Yes No Remarks: VEGETATION — Use scientific names of plants. Absolute Dominant Indicator Dominance Test worksheet: Tract Stratum Plot size: 16'rad. ) ( % Cover SRecies? Status Number of Dominant Species 1 Tsuga heterophyfla 40 Y FACU That Are OBL, FACW, or FAC: 0 (A) 2. Pseudotsu a menziesh 40 Y FACU Total Number of Dominant 3. Species Across All Strata: 4 (B) 4. 80 Percent of Dominant Species 0 = Total Cover That Are OBL, FACW, or FAC: (A/B) Saplinnl5hruh Stratum (Plot size: 6'dla } Prevalence Index worksheet: 1' Mahonia aquifolium 30 Y FACU Total % Cover of: Multiply. fly:_ 2. OBL species x 1 3. FACW species x 2 = 4. FAC species x 3 = 5. 30 FACU species x 4 = 6'rad = Total Cover UPL species x 5 = hterb Str,�„tum ) (Plot size: 1. Pol stichum munitum 20 Y FACIL I Column Totals: (A) (>3] 2• Prevalence Index = B/A = 3. Hydrophytic Vegetation Indicators: 4. _ 1 - Rapid Test for Hydrophytic Vegetation 5. _ 2 - Dominance Test is >50% 6. _ 3 - Prevalence Index is 53.0' 7. 4 - Morphological Adaptations' (Provide supporting $ _ data in Remarks or on a separate sheet) g _ 5 - Wetland Non -Vascular Plants' _ Problematic Hydrophytic Vegetation' (Explain) 10. 11 'Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. 20 = Total Cover Woody Vine Stratum (Plot size: 6' rad. ) 1. Hydrophytic 2 Vegetation X Present? Yes No 0 = Total Cover % Bare Ground in Herb Stratum 80 Remarks; US Army Corps of Engineers Western Mountains, Valleys, and Coast —Version 2.0 Produced with a Trial Version of -�7)F Annotator - www.PDFAnnotator. �ln SOIL Sampling Point: r- Profile Description: (Describe to the depth needed to document the Indicator or confirm the absence of Indicators.) Depth Matrix Redox Features (inches) Color moist % r Color (moist) % Type _ Locz Texture Remarks 0-2 10YR2f2 100 none sandy gravelly loam 2-16 10YR416 100 none sandy gravelly loam 'Type: C=Concentration, D=De letion, RM=Reduced Matrix. CS=Covered or Coated Sand Grains. zLocation: PL=Pore Unin , M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Solls9: _ Histosol (All) _ Sandy Redox (S5) _ 2 cm Muck (A10) _ Histic Epipedon (A2) _ Stripped Matrix (S6) _ Red Parent Material (TF2) _ Black Histic (A3) _ Loamy Mucky Mineral (F1) (except MLRA 1) _ Very Shallow Dark Surface (TF12) _ Hydrogen Sulfide (A4) _ Loamy Gleyed Matrix (F2) _ Other (Explain in Remarks) _ Depleted Below Dark Surface (Al 1) _ Depleted Matrix (F3) _ Thick Dark Surface (Al2) _ Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and _ Sandy Mucky Mineral (S1) _ Depleted Dark Surface (F7) wetland hydrology must be present, _ Sandy Gleyed Matrix (S4) _ Redox Depressions (F8) unless disturbed or problematic. Restrictive Layer (if present): Type: Depth (inches): Hydric Soil Present? Yes No X Remarks: HYDROLOGY Wetland Hydrology Indicators: Primary Indicators minimum of one re uired• check all that a I Secondary Indicators 2 or more required) Surface Water (Al) Water -Stained Leaves (139) (except _ Water -Stained Leaves (139) (MLRA 1, 2, _ High Water Table (A2) MLRA 1, 2, 4A, and 4B) 4A, and 46) Saturation (A3) Salt Crust (B11) _ Drainage Patterns (1310) _ Water Marks (131) _ Aquatic Invertebrates (1313) _ Dry -Season Water Table (C2) _ Sediment Deposits (132) Hydrogen Sulfide Odor (Cl) _ Saturation Visible on Aerial Imagery (C9) Drift Deposits (63) Oxidized Rhizospheres along Living Roots (C3) _ Geomorphic Position (D2) _ Algal Mat or Crust (B4) _ Presence of Reduced Iron (C4) _ Shallow Aquitard (D3) _ Iron Deposits (135) _ Recent Iron Reduction in Tilled Soils (C6) _ FAC-Neutral Test (D5) _ Surface Soil Cracks (66) — Stunted or Stressed Plants (D1) (LRR A) _ Raised Ant Mounds (D6) (LRR A) _ Inundation Visible on Aerial Imagery (137) _ Other (Explain in Remarks) _ Frost -Heave Hummocks (D7) _ Sparsely Vegetated Concave Surface (138) Field Observations: Surface Water Present? Yes No X Depth (inches): Water Table Present? Yes No x Depth (inches): ° X Saturation Present? Yes No X Depth (inches): none @ 1 Wetland Hydrology Present? Yes No includes ca illa fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast — Version 2.0 R -AZI n � a � 143. V. Z !, {G t �.�-v- ❑�N rl>1 m _m r`031b §0 rn CD o z o CD a., C: � � �-' o r m Q � 0 m .r cu e > rn %JN \ �v �51LZ06 -��► oft, end x u► 5 � %A- ux Q UN��❑ o dfl s>woti oiianci ��i o11and m m cn o _® mn � ,5LLZ06 -L� D -< C m pnA � u D r- � :* M m D D s A %.h%.% T v U FN 8 m CO OM —� r, ni m 0 W 0 9� n Apt - .•1i cal. o �cau• �r ko .� a ra . s tQ it A �51LZ06 -�� Y A I m o m y -�j r f A Grit " � � ZR ins► 1 _g5LL306 v 41 ;� f J sorwpal� R604. DRIVIkAW cs , . ju 1-0 Lu m lu m. W ell ��sio d o o / 04K r RESUBMITTED JUL 0 2 2013 A ► . ► r 1�iTY OF FEDERAL WAY � +�AL?NITY DEI/ELOPIAEN7 AtdLi. x C.2.2 FULL TNF1LT1tA1�dN = FIGUREC 2:2. X �'pCAI� .ilRLYVj --------------------------------- House -Roof Downspout Roof fJONN Downspout Catch B asin (hard Drain) DRY WELL PLAN VIE' NTS O 7'x7 'x7, Hole Filled with ilia - T washed Drain Rods R oaf Downspout House CYerflow Mark C enter of Hole Splash Block Topsoil with I' Capped Oic FOr I Other t er Sace Fine Mesh Screen � Malin. 4v di a PVC Ripe C�ch Basin lr d Drain} 7 x7 x7 . i� Sides of Hole Hale Filled with !_ineciv.-Rh Filter Fabric IV2- 3"0 Washed Drain P, od, �5'snisr. DRY WELL Mi in. I'abo�ve sa�as�i H � C3roundwatar -rabfe SECTION NTS 2016 Draft Surface Water Design Manual —Appendix C C-55 #/#/2016 C.2.2 FULL INFILTRATION 9. Runoff from roadways, driveways, and parking areas shall pass through a yard drain or catch basin fitted with a down -turned elbow prior to entering the infiltration trench (see Figure C.2.23, p. C-54). The elbow is intended to trap spilled material in the catch basin sump so that the spilled material can be cleaned up more easily by the homeowner. C.2.2.4 USE OF DRYWELLS FOR FULL INFILTRATION Drywells are gravel filled holes as opposed to trenches and therefore may allow for a more compact design in areas where the depth to the maximum wet -season water table is relatively deep (e.g., 6 feet or greater). Figure C.2.2.0 on page C-55 illustrates the specifications for drywell infiltration systems as outlined below: 1. When located in coarse sands and cobbles, drywells must contain avolume of gravel equal to or greater than 60 cubic feet per 1,000 square feet of impervious surface served When located in medium sands, drywells must contain at least 90 cubic feet of gravel er 1,000 square feet of impervious surface served. 2. Drywells must be at least 48 inches in diameter and deep enough to contain the gravel amounts specified above for the soil type and impervious surface area served. 3. The gravel used for drywells must be 11/Z-inch to 3-inch washed drain rock. The drain rock may be covered with backfill material as shown in Figure C.2.2.0 (p. C-55) or remain exposed at least 6 inches below the lowest surrounding ground surface. 4. Filter fabric (geotextile) must be placed on top of the drain rock.(ifproposed to be covered with backfili material) and on the drywell sides prior to filling with the drain_ .rock. 5. Spacing between drywells shall be a minimum of 10 feet. 6. Drywells must be setback at least 15 feet from:buildings with crawl space or basement elevations that are below the overflow, point of the drywellL C.2.2.5 USE OF GROUND SURFACE DEPRESSIONS FOR FULL INFILTRATION Ground surface depressions (also called "inintradon depressions") are another option for full infiltration if the maximum wet -season water table or hardpan is at least 3 feet below the bottom of the depression. Figure C.2.2.D illustrates the specifications for infiltration depressions as outlined below: I. When located in coarse sands or cobbles, infiltration depressions must be able to store at least 40 cubic feet of stormwater per 1,000, square feet of impervious surface served. When located in medium sands, ground surface depressions must be able to store at least 60 cubic feet of stormwater per 1,000 square feet of impervious surface served. This volume of water storage must be achieved through the excavation of existing native soil, not through the construction of berms. 2. The stormwater storage areas of infiltration depressions must be at least 12 inches in depth with a minimum 6. inches of freeboard before overflow. 3. The depression overflow point must be at least 6 inches below any adjacent pavement area and must be situated so that overflow does not cause erosion damage or unplanned inundation 4. The depression side slopes must be no steeper than 3 horizontal to 1 vertical. 5. Spacing between multiple infiltration depressions shall be a minimum of 4 feet. 6. Infiltration depressions must be setback at least 15 feet from buildings with crawl space or basement elevations that are below the overflow point of the infiltration depression. 7. Infiltration depressions may be any size or shape provided the above specifications and the minimum requirements in Section C.2.2.1 are met. 2016 Draft Surface Water Design Manual — Appendix C #/#/2016 C-51 ,SECTION C.2 FLOW CONTROL Bl FIGURE C.2.4.0 EXAMPLES OF BASIC DISPERSION FOR STEEP DRIVEWAYS � I � J In O R r � I I i I I I 700 SQ. FT. MAX. BETWEEN BERMS i I DRIVEWAY 2" TO 4" Il SLOPE o i I O LOCATE DRAIN 25' 0 FROM R.O.W. IF I I DRIVEWAY SLOPES , E2 TOWARD STREET I 6"MIN. I-wc ---^r- ------�-- ❑IAGONAL BERM WITH DISPERSION 'ten-----'_ BERM DETAIL 0. L� `.' TRENCH NTS AYS� 25'VEGETAT�D FLOWPATH SEGMENT I PLAN - STEEP DRIVEWAY WITH DIAGONAL BERMS NTS N N N Q LOCATE DRAIN p 25' FROM R.O.W. IF FL DRIVEWAY SLOPES , 700 SQ. FT. MAX. TOWARD STREET I + BETWEEN DRAINS P' i DRIVEWAY SLOPE SLOT DRAIN WITH fit 00, DISPERSION P ROVED V � V ; a� LfiG� TRENCH A P CITY OF FEDERAL WAY PUBLIC WORKS DEPARTMENT ti 25' VEGETATED BY 7.rr+'� FLOWPATH DATE ¢� 5— SEGMENT ' PLAN -_STEEP DRIVEWAY WITH SLOTTED DRAINS NTS 4/24/2016 2016 Surface Water Design Manual - Appendix C C-68 C.2.2 FULL INFILTRATION FIGURE C.2.2.A TYPICAL TRENCH INFILTRATION SYSTEM 4" RIGID OR 6" FLEXIBLE PERFORATED PIPE r 1--------- i INFILTRATION TRENCH - PLAN VIEW NTS CB SUMP w/SOLID LID ROOF DRAIN TRENCH SETBACK FROM - ROOF DRAIN BUILDING AS REQUIRED, 15' MIN OVERFLOW — ' SPLASH BLOCK —A 4" RIGID OR 6" FLEXIBLE PERFORATED PIPE A 6" 6-��^-- ___ ---- �--------------- LEVEL I 12"' -� .-'WASHED ROCK 1 Z'- 4 --- _ A VARIES —� FINE MESH — SECTION VIEW SCREEN NTS 24" - _ 1 12" � T MIN. V ABOVE SEASONAL HIGH GROUNDWATER TABLE, SEE SECTION C.2.2.2 APPROVED CITY OF FEDERAL WAY PUBLIC TRKS DEPARTMENT BY 1' MI[4 11 1' MIN. SETBACK r� FROM BUILDING 5' MIN. CB SUMP w/SOLID LID COMPACTED BACKFILL FILTER FABRIC 4" RIGID OR 6" FLEXIBLE PERFORATED PIPE 11" - 3" WASHED ROCK 24" SECTION Aft tiya* 9A NTS 2016 Surface C-53 4/24/2016 SECTION C.2 FLOW CONTROL BM IF-- FIGURE C.2.2.B ALTERNATIVE TRENCH INFILTRATION SYSTEM FROM ROOF — GRASS 1 I OVERFLOW •rr`,f/fir r�r �,�.: 6" MIN. - 3/4' TQ 1-1/2" WASHED DRAIN `f. 18" MIN. NOTE: ROCK f%fff SEE C.2.2.3 FOR /{ TRENCH LENGTHS, MIN. V ABOVE 15' MIN. AS TRENCH SPACING AND SEASONAL HIGH I REQUIRED, SITE LIMITATIONS GROUNDWATER 7' 0.AIAI """ I CFF ('- 9 9 TABLE, SEE I� SECTION C.2.2.2�' X-SECTION NTS FILTER STRIP SEE SECTIONS GRASS 1 6.3.4 & 6.3.5 ❑9IVEW pY - OVERFLOW�f . 6" MIN. /�f1 ��f`��f��\�� TO /2" 3/4" 1-1 `jr WASHED DRAIN r��f 18" MIN. ROCK NOTE: SEE C.2.2.3 FOR MIN. V ABOVE TRENCH LENGTHS, SEASONAL HIGH TRENCH SPACING AND GROUNDWATER 2' MIN. SITE LIMITATIONS TABLE,SEE SECTION C.2.2,2� X-SECTION NTS 4/24/2016 2016 Surface Water Design Manual — Appendix C C-54 OEOTEC H CONSULTANTS, INC. Mehl Homes PO Box 5447 Kent, Washington 98064 RESUBMITTED AUG 15 2017 GGCITY U(°TY D OPMegr Attention: Steve Mehl via email: mehlhomes@aol.com Subject: Geotechnical Engineering Considerations Proposed Residence 35818 - 4th Place Southwest King County, Washington Dear Mr. Mehl: 2401 loth Ave E Seattle, Washington 98102 (425) 747-5618 FAX (425) 747-8561 JN 17427 August 4, 2017 The undersigned Principal of Geotech Consultants visited the subject site on August 1, 2017 to observe site conditions. We understand that, based on GIS mapping, there is an Erosion Hazard Area beginning approximately 30 feet south of the subject site. The purpose of our visit was to observe the site and adjacent site conditions with regards this Area. This letter provides our professional opinion from a geotechnical engineering standpoint regarding the relationship of the site and the proposed residence with regards to the Erosion Hazard Area. The subject property is rectangular, being long in the north -south directly. Most of the site is forested. Overall, the site and adjacent sites tend to decline to the south/southeast. Most of the site has a gentle to very gentle inclination, although its center portion is has a gentle to moderate inclination. The southern portion of the subject site, which is the area where the proposed residence will be located, is only inclined about 7 to 10 percent. There is an existing garage on the adjacent property just south of the adjoining property line, so that area is inclined less than 5 percent. Although we were not able to directly observe the area south of this garage, based on the GIS mapping, that area slopes more moderately, in the range of 20 to 25 percent; it appears that this inclination is the reason that area is considered an Erosion Hazard Area based on the GIS mapping. A test pit had been excavated on the southern portion of the subject site down approximately 4 feet prior to our arrival, apparently for septic design reasons. We were able to observe that, below about 12 inches of topsoil and very organic loam, the soil in this southern portion (where the proposed residence will be located) consisted of fine sand that was only slightly silty. As compared to most soils in the Puget Sound area, which are siltier, it is our opinion that the erosion potential of the onsite soil where the residence will be location is low. We point out that only sites where there is no vegetation or impervious surface cover have a potential for having erosion issues. So, development sites are generally only erosion issues during construction. That is why erosion control measures are important and are very typical on construction sites in the Puget Sound area. Z G) GEOTECH CONSULTANTS, INC. Mehl Homes August 4, 2017 CONCLUSIONS JN 17361 Page 2 As noted above, the area on the southern side of the site where the proposed residence is located, as well as the first, approximate 30 feet of the adjacent southern property, has an inclination of only about 5 to 10 percent. In addition, also as noted above, the soils have a low potential for erosion due to their low silt content. Lastly, the area between the area of the proposed residence and the mapped Erosion Hazard Area to the south if the site is mostly covered with an existing garage. For these reasons, it is our professional opinion from a geotechnical engineering standpoint that the mapped Erosion Hazard Area will be unaffected by the development of the proposed residence. As with any construction site in the Puget Sound area, it is prudent to implement erosion control measures during construction as standard protocol. Measures such as a gravel construction entrance and silt fencing on the downslope side of the site should be maintained on the site during construction at a minimum. We trust that this letter is suitable for your needs at this time. Please contact us if there are any questions regarding this report, or for further assistance. DRW: mw Respectfully submitted, GEOTECH CONSULTANTS, INC. D. Robert Ward, P.E. Principal GEOTECH CONSULTANTS, INC. July 25, 2017 Mr. Steve Mehl Mehl Homes, Inc. 10611 SE 291 ' Street Auburn, Washington 98092 AQUATICA Environmental Consulting, LLC P.O. Box 308 Duvall, Washington 98019 AUG 15 2017 COM UNITY ECE� WAY SUBJECT: Stream and Wetland Assessment REFERENCE: Parcel 3021049182, Federal Way Washington Dear Steve: #17-309 Thank you for the opportunity to assist with this property. On July 12, 2017 I visited the above referenced property. The purpose of this site visit was to evaluate the property for wetlands and streams, the results of which are summarized in this letter. The subject property is a 35,801 square foot lot located near the southwestern corner of the City south of SW 356th Street. The property is located at the end of 41h Place SW on the east side of the road (Figure 1). _ it :f, r y 1 �'G. �i },• i '�-�I� Figure 1. Vicinity Map. Source: King County iMAP (King County 2017) No& V O N V V 01 A-ul BACKGROUND REVIEW Prior to the site visit a brief review of background information was conducted, which included the Natural Resources Conservation Service (MRCS) soil map and the City of Federal Way's Critical Area Map. The NRCS has mapped soil on the property as Alderwood gravelly sandy loam, 5-15 percent slopes (Figure 2). Alderwood is a moderately well drained soil that formed from glacial outwash over dense glaciomarine deposits (MRCS 2017). Alderwood is not hydric soil although occasionally it does have hydric soil inclusion in depressions and drainage ways, although this property had no observed depressions or drainage ways. The surrounding properties are also mapped as Alderwood soils or Everett soils, another non-hydric soil that is somewhat excessively drained and not hydric. The City of Federal Way Critical Area Map does not depict any wetlands or streams on or anywhere near the property (Figure 3). Figure 2. Natural Resources Conservation Service Soil Map (MRCS 2017) 1 present. No signs of wetland hydrology were seen on or near the property. Two photographs follow that document vegetation on the site. Figure 4. Photos of Forested Vegetation layer of Douglas fir and Big Leaf Maple Figure 5. Photo of understory vegetation of sword fern, salal In summary, as indicated by the review of background information and confirmed by the site visit, the subject property and visible vicinity is an obvious upland area with no wetlands or streams. Should you have any questions, please call me at (425) 802-8988. Sincerely, Aquatica Environmental Consulting, LLC Teresa Opolka, PWS = Ir ubiic Health - Seattle and King County I � �rr� (c' Record I.D. Number Site Design Application Form for Individual On -Site Sewage System (OSS) ION 01 ' • 1 i %" Cam' (Submit 5 copies of application with 4 copies of fans) I Departmerit Else niy �} ATTACH A DETAILED ROUTEf DIRECTION Approximate=35818 4th PI . SW 'd r MAP FOR LOCATING THE PROPERTY. Site Address:R E S U 13 M I1� E Name and address of property owner I See Applicant rl — _ 1 Applicant Street Address PO Box 5447 AUG 15 2017 Name Mehl Homes I City -Zip Code Kent 98064 Pho I L �_ _ -D7 Last First COMMUNI iY DEVELOPMENT Designer Street Address PO Box 1040 Barry Cole City -Zip Code Enumclaw 98022 Phone 1 360-826-1965 THIS IS NOT A PERMIT PROPERTY INFORMATION: Legal Description Attached Parcel # (APN) 1 3 1 0 1 2 1 11 0 1 4 1 9 1 11 8 1 2] Section: 131 01 Township: 1 2 1 1 Range: 0 4 Subdivision Name: 1 Area 6 KCSP #07283 I Lot: I I I j Block: I I 1 Property Size I _0_ 3 1.51__8 t 0 1_ 1_I Sq. ft. Acreage: I •82 I Rural Area ❑ Urban Area 0 Distance from property line to nearest sewer: 1 31 31 0 1+ 1 Water Supply U (IP) I = Individual ® Group A Supply [] Group B Supply Public Water Supply Name: I Lakehaven Water District !Dm 'I I I 1 I J_ 1 Sensitive Area: LN� (Y?N) If yes, specify L__j (L,W,O) L = Landslide W = Wetlands = Other SYSTEM INFORMATION: New System [_Xj Repair Design L_j Correction of OSS Failure? U Y?N Detailed Plans Attached (4 sets) U Y?N Type of Building 1I - I - I s I FJ SF = Single Family MF = Multiple Family COMM = Commercial INST = Institutional Type of System Proposed: _1 — 1 P I D I G = Gravity GP = Gravity with pump M = Mound SF = Sand Filter PD = Pressure Distribution HT = Holding Tank CT = Composting Toilet E = Experimental [] = Other Dates Soils Logged: � IL 4 II 11 9j 11 7 Soil Logs Data Attached: (Min. 4/1ot) U Y?N Depth to Watertable or Restrictive Layer: nches Maximum Slope in Drainfield/Reserve Area LLL2 CALCULATIONS: Number of bedrooms: U Total Gallons/Day (450 minimum): 1 41 51 J Gal. Soil Texture Type (1A-5) L 0 j Application Rate: L6j Gal/sq ft/day Total Absorption Area: 10 1 ? 1 5.1 01 Sq. ft. Trench Width 1 36J inches Total Drainfield Length: 1 2 1 51 0 Ft. Septic Tank Size: 111 5 10 1 0 1 Gal. Garbage Grinder LNJ Y?N Pump Chamber Size (if needed) 11 1 5 1 01 0 I Gal.J , Trench Depth (min/max): 1 1 1 2 / 3 6 inches I understand that failure to comply with the Code of ISing 13aard Ofteallh Title 13 may result in the disapproval of the sewage s)rs6em bean proposed in this application. Non-compliance may lead to revocation of my Designers Certificate of Cd anchor approprdate fegat action by the Health Department. I L'•' C. Cf Designer's Signature: - 4c r K.C. ID# 1 010 8 4 Date: 7/26/17 FOR HEALTH DEPARTMENT USE ONLY: NOTE: SYSTEM MUST BE INSTAUED BY A KING COUNTY CERTIAED INSTALLER UNLESS OTHERWISE PROVIDED BY CODE +••� APPROVED (date): (3 2 ` ' -T BY: 4*4 Comments 1 ® Pre-cansfruc>!lon meeting required between designer, Installer, builder prior t'o perrr+f#issuance APPROVAL OF THIS DESIGN APPLE ATION IS (LASED SOLELY ON INFORMATION PROVIDED IN THIS APPLICATION AND DdES is07 CONSTITUTE PERMISSION TO BEGIN CONSTRUCTION OF THE PROPOSED SEWAGE DISPOSAL SYSTEM OR ANY OTHER IMPROVEMENTS ON THE SITE. THIS APPROVAL SHALL NOTBE CONSIDERED AN ASSURANCE. EI-HER EXPRESSED OR IMPLIED, THAT DEVELOPMENT PERMITS FOR THE SITE WILL BE ISSUED. THIS APPLICATION EXPIRES TWO YEARS FROM DATE OF APPROVAL. DISAPPROVED (date): BY: See attached Site Deficiency Sheet. Any person aggrieved by any demon or final order or the Heallh Ofrrcer may file a written application for appeal to the Health Officer within 60 calendar days of the date of the above decision. (Title 13. KC.B.O.H. Chapter 13.12 - Sewage Review Committee). CS 13.15.97 Rev.7121100 RECEIVED r-- CLEANOUT / MONITOR PORTS TYP. T 1700 SL 2 i.V MIN : ! � 10' �1 � 1� I 11111 • 1 wol 1 SL 1 �1 I � 0 CLEARING NOTE: CLEARING WITHIN THE PRIMARY & RESERVE DRAINNELO AREAS SHALL BE ACCOMPLISHED BY A LICENSED KING 1.0 1 1 1 1 COUNTY MASTER INSTALLER. ANY LARGE TREES IN THE DRAINFIELD AREAS TO BE REMOVED SHALL BE CUT DOWN AND THE STUMPS GROUND IN PLACE AS TO NOT DISTURB THE ORIGfNAL SOfLS WITHIN THESE AREAS. 1500 GALLON TANKS EP 1600 SDC + EP 1500 P I 1 I ! STUB EL 175.25' TREES TYP. 51 `--PANEL ,�1 \ \ \• \ \ \ \ \ � \ PROPOSED 3 BEDROOM \�\ SL 4 RESERVE WHITEWATER OF 50 LOCATIO RESIDENCE 3° CL. 200 AVC TRANSPORT LINE FF. EL. 177.60' SL5 r\•\ i .\ ;ILL HYD- TREES TYP. a Q a. LATERAL FEEDERS RESERVE DRAINFIELD AREA 675 LINEAL FEET DRIP IRRIGATION. 2.9 LINE SPACING. Ill: aId YIN IIIl1w L-PRIMARY DRAINFIELD 250 LINEAL FEET /� PRESSURE DISTRIBTION. 36" TRENCH WIDTH. 4th PLACE SW V1pr I t DRAINFIELD CONTROL POINT z� CAP & REBAR " 1 EL 203.72' ASSUMED I NORTH 5 10 0 -4 GRAPHIC SCALE 1" =20' 4� 280.0911' SOIL LOGS: �} 4/16 i � ~_y SL 1 0"-24" MEDIUM BROWN LOAMY FINE SAND 24"-42° TAN GRAVELLY LOAMY SAND 42"-60" TAN LOAMY FINE SAND SL 2 0"-24" MEDIUM BROWN LOAMY FINE SAND 24"-60" TAN LOAMY FINE SAND SL 3 0"-24" MEDIUM BROWN LOAMY FINE SAND 24"-64" TAN LOAMY SAND SL 4 0"-22" MEDIUM BROWN LOAMY FINE SAND 22"-38" TAN LOAMY FINE SAND 38"-60" TAN LOAMY SAND SL 5 0"-26" TAN LOAMY FINE SAND 26"-44" TAN LOAMY FINE SAND LATER METER FROM LAKEHAVEN WATER DISTRICT DIRECTION OF DOWNSPOUTS J # pp PROJECT: SCALE: co OSS DESIGNED FOR 1"=20' DRAWN BY: MEHL HOMES 5100107 COLE SEPTIC DESIGN 35818 4fh PL SW DATE: P.C. Box 1040 7/20/17 ENUMCLAW, WA. 98022 (360)825-1965 fax (360)825M12 PARCEL# 3021049182 DRAWING# - 17-30-D