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Soils ReportMountain Meadows Soils Report For Evaluating Site Feasibility of Stormwater Infiltration BMP’s Associated with Roof, Driveway and Road Runoff. Site Address: 8818 Burnett Road SE, Yelm WA 98597 TPN: 21713310400 Prepared For: Henrietta Morey PO Box 202 Kapowsin, WA 98344 Contact: Henrietta Morey (253) 377-8400 moreyrealestate@gmail.com Prepared By: Parnell Engineering, LLC 10623 Hunters Lane S.E. Olympia, WA 98513 Contact: William Parnell, P.E. (360) 491-3243 parnelleng@hotmail.com PE PARNELL ENGINEERING, LLC SOIL EVALUATION REPORT FORM l: GENERAL SITE INFORMATION PROJECTTITLE:MountainMeadows　　　　　　　　　　　　　　　　　　　　　　　　　　　　　SHEET:1OFl ` PEPROJEC丁NO∴20125　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　DATE:9/18/2020 PREPAREDBY:W冊amPa「neIi,P.E. 1.SiTEADDRESS:8818BumettRoadSE,YelmWA98597　TPN:21713310400 2.PROJECTDESCRIPTION:ProposedpIat. 3.SiTEDESCRIPTION:The2.89ac「eir「egula「shapedp「ojectsiteiscu「「entlyuno∞uPiedbyanybuiiding St「uCtu「eS.Site「eliefisgentIysIopingf「omeasttowest,Va「γingineIevationf「om340ft.atthenortheast P「OPe「tyCOme「tO328ft.aiongthewestp「opertyline.Sitevegetationconsistsofpastureg「assesandscotch bloomwithafewconifert「eesatthesouthwestp「opertyco「ne「.Theprojectsiteisboundedtothewestby Bu「nettRoadSEandresidentialp「opertytothenorth,eaStandsouth.Theon-Sitesoilsaremappedbythe Natu「alResourceConservationService(NRCS)asaweil-d「ainedSpanawayg「aveiIysandyloam(110) fo「medinvoicanicashovergrave=youtwash. 4.SUMMARYOFSOILSWORKPERFORMED:Twotestpitswe「eexcavatedbytrackhoetoamaximum depthof168’’beiowtheexistinggrade.Soilswe「einspectedbyente「ingandvisuallyloggingeachtestpitto adepthoffou「feet.SoiIsbeyondfourfeetwereinspectedbyexaminingbackhoetailings.Soiisampieswe「e takenfromtestpit#1and#2atlO8’’beIowtheexistinggrade.G「ainsizeanaIysismethodwasusedto dete「minethesuitab=ityofthe「ep「esentativesoiIhorizonsforstormwaterin凧t「ationfac冊es.Aninitial Satu「atedhyd「auIicconductivity(Ksat)wascaicuiatedandthenreducedbyco「「ectionfactors(CFT)to PrOduceanadjusteddesigninf冊「ation「ateKsatdesignforfac冊ysizingpu「poses.Testpitso旧ogdatasheets andg「ainsizeanaIysisdatawithKsatcaIculationsa「eincIudedinthis「eport. 5.ADDITIONALSOiLSWORKRECOMMENDED:Additionaisoilswo「kshouidnotbenecessa「y, 6.FINDiNGS:Theon-SitesoilsaremappedbyNRCSasaSpanawaygrave=ysandyloam(110).Testpits 「eveaIedsoiisconsistentofaSpanawayse「ieswithst「atumsoiisp「o輔ngave「yg「ave=yandcobbledfine SandyIoamove「lyinganext「emelygraveIiyandcobbledloamycoa「se高nesand.Winterwate「tabIewasnot PreSentandpossibIeindicatorswe「enotobvious.ThesoiIgrainsizeanaiysismethod「esuitedinadjusted KsatdesignvaluesforthefoiIowingsampIes:Testpit#1atlO8’’belowtheexistingg「ade-38.27in/hr,teStPit #2atlO8’’beIowtheexistinggrade-55.4in/hr. 7.RECOMMENDATIONS:TheSpanawayseriessoiisaresomewhatexcessivelydrainedsoiIsfoundon OutwaShpIainsfo「medinvoIcanicashoverg「ave=youtwash,in輔「ation「atesa「egeneraily「apidinthe SubstratumsoiIs.GrainsizeanaIysismethodresultedinadjustedKsatdesignvaiues>20in/h「.Fo「thetargeted Cho「izonsoiIs言tis「ecommendedKsatdesign(F)vaIuesdonotexceed20inlhr.Please「efe「totheattached SOiig「adationtest「esuItswithKsatdesigncaicuiations,aSSOCiatedindividualsoi=ogdatasheetsandtestpit/so旧og Iocationmap. Du「ingconst「uction,CaremuStbetakentop「eventthee「osionofexposedsoiIs.Sto「mwaterd「ainagefacility in輔「ationsu「facesmustbeproperIyprotectedfromcontaminationbythe血e-graineduppe「ho「izonsoiIs andfromcompactionbyconst「uctionsiteactivities.SoiIsnotp「operiyprotectedmaycausestormwate「 d「ainageinfilt「ationfac冊estonotperformasintended. Ihe「ebycertifythatIprepa「edthisreport,andconductedorsupervisedtheperfo「manceofreIatedwo「k"I 一 醗 雷 の 態繭 〇〇〇葛"葛「-○○ SOIL EVALUATION REPORT FORM 2: SOIL LOG INFORMATION PROJECT TITLE: Mountain Meadows SHEET: 1 OF 2 PROJECT NO.: 20125 DATE: 9/16/2020 PREPARED BY: William Parnell, PE SOIL LOG: #1 LOCATION: 40 ft. north and 20 ft. east of the southwest property corner. (see attached site plan map) 1. TYPES OF TEST DONE: Grain size analysis 2. NRCS SOILS SERIES: Spanaway gravelly sandy loam (110) 3. LAND FORM: Outwash plain 4. DEPOSITION HISTORY: Volcanic ash over gravelly sand 5. HYDROLOGIC SOIL GROUP: A 6. DEPTH OF SEASONAL HW: Unknown 7. CURRENT WATER DEPTH: Greater than bottom of hole 8. DEPTH TO RESTRICTIVE HORIZONS: Greater than bottom of hole 9. MISCELLANEOUS: Gently sloping 10. POTENTIAL FOR: EROSION RUNOFF PONDING Slight Slow Minimal 11. SOIL STRATA DESCRIPTION: See Following chart 12. SITE PERCOLATION RATE: See FSP 13. FINDINGS & RECOMMENDATIONS: Roots were present to 60”. Use a design infiltration rate < 20 in/hr in the C horizon soils. Soils Strata Description Soil Log #1 Horz Depth Color Texture %CL %ORG CF STR MOT IND CEM ROO <X> FSP A 0”- 14” 10YR3/2 VGrCob SaLm some stones <15 <12 <45 1SBK - - - ff 2-6 4 Bw 14”- 18” 10YR3/4 VGrCob SaLm some stones <12 <8 <45 SG - - - ff 2-6 6 C1 18”- 60” 10YR5/4 ExGrCobC- FSa some stones <2 - <85 SG - - - ff >20 <20 C2 60”- 85” 10YR5/2 ExGrCobC- FSa some stones <2 - <85 SG - - - - >20 <20 C3 85”-168” 10YR5/2 ExGrcobM- FSa some stones <2 - <85 SG - - - - >20 <20 SOIL EVALUATION REPORT FORM 2: SOIL LOG INFORMATION PROJECT TITLE: Mountain Meadows SHEET: 2 OF 2 PROJECT NO.: 20125 DATE: 9/16/2020 PREPARED BY: William Parnell, PE SOIL LOG: #2 LOCATION: 40 ft. north and 80 ft. east of the southwest property corner. (see attached site plan map) 1. TYPES OF TEST DONE: Grain size analysis 2. NRCS SOILS SERIES: Spanaway gravelly sandy loam (110) 3. LAND FORM: Outwash plain 4. DEPOSITION HISTORY: Volcanic ash over gravelly sand 5. HYDROLOGIC SOIL GROUP: A 6. DEPTH OF SEASONAL HW: Unknown 7. CURRENT WATER DEPTH: Greater than bottom of hole 8. DEPTH TO RESTRICTIVE HORIZONS: Greater than bottom of hole 9. MISCELLANEOUS: Gently sloping 10. POTENTIAL FOR: EROSION RUNOFF PONDING Slight Slow Minimal 11. SOIL STRATA DESCRIPTION: See Following chart 12. SITE PERCOLATION RATE: See FSP 13. FINDINGS & RECOMMENDATIONS: Roots were present to 28”. Use a design infiltration rate < 20 in/hr in the C horizon soils. Soils Strata Description Soil Log #2 Horz Depth Color Texture %CL %ORG CF STR MOT IND CEM ROO <X> FSP A 0”- 20” 10YR3/2 VGrCob SaLm some stones <15 <12 <40 1SBK - - - ff 2-6 4 Bw 20”- 28” 10YR3/4 VGrCob SaLm some stones <12 <8 <50 SG - - - ff 2-6 6 C1 28”- 68” 10YR5/4 ExGrCobM- FSa some stones <2 - <85 SG - - - ff >20 <20 C2 68”-168” 10YR5/2 ExGrCobM- FSa some stones <2 - <85 SG - - - - >20 <20 Abbreviations Textural Class (Texture) Structure (STR) Grades of Structure Cobbled - Cob Granular - Gr Strong - 3 Stoney - St Blocky - Blky Moderate - 2 Gravelly - Gr Platy - Pl Weak - 1 Sandy - Sa Massive - Mas Loamy - Lm Single Grained - SG Silty - Si Sub-Angular Blocky - SBK Clayey - Cl Coarse - C Very - V Extremely - Ex Fine - F Medium - M Induration & Cementation (IND) (CEM) Weak - Wk Moderate - Mod Strong - Str Mottles (MOT) 1 Letter Abundance 1st Number Size 2nd Letter Contrast Few - F Fine - 1 Faint - F Common - C Medium - 2 Distinct - D Many - M Coarse - 3 Prominent - P Roots (ROO) 1st Letter Abundance 2nd Letter Size Few - f Fine - f Common - c Medium - m Many - m Coarse - c <X> - Generalized range of infiltration rates from NRCS soil survey (<X>) FSP - Estimated Design Field Saturated Percolation rate based on horizon specific factors and specific test results. MountainMeadows 1 90 80 くの ∽ の ∈70 」 ○ 言60 掌 主50 D ⊂ 紛40 く○ ○. 宣30 の し20 10 0 C 」 i i l i I I 0.001 N i i I　　　)　　　　　　　　　　　　l　　　　　　i TestPit♯1atlO8’. \ i ●　Sampiel i i l i l 100　　　　　　　10　　　　　　　1Samplel　　　O.1　　　　　　　0.01 i obb i GバブVel 上辺nd i　鋤 ′ Coo糖e ん花柄朋　i　筋e Ksat Ca!culations Test pit#1 - SamPle #1 taken at lO8’’beiowthe existing grade Soil G「adation丁est Resuits: DlO　=　0.31 D60　=　8.5 D90　=19.0 簡nesこ　0.0117 loglO (Ksat) = -1.57 + 1.90 (DlO) + 0.015 (D60)一0.013 (D90)- 2.08 (怖nes) IoglO(K艶t)=-1.57十1.90(0.31)十0.015 (8.5)-0.013 (19.0主2.08(0.0117)=-1.1248 Ksat =　0.0750 cmIs Ksat=　0.0750 cm/s xO.3937 in/cm x60 s/min x60 min/h「 Ksat= 106.32 inIhr Final Desi0n Infi!tration Rate CalcuIation : Ksat desian Ksat design = Ksat initfal X CFT Ksa白nitiai = 106.32 in/h「 CFT (Total Co汀eCtion Facto「- July 2016 SWMM) = CFvx CFtx CFm CFv = 1.0 (two tests pits, nO SOil variabiiity〉 CFt = 0.4 (g「ain size method) CFm = 0.9 (S航ation & biofouling) CF丁=1.OxO.4xO.9 Ksat desisn = Ksat initfai X CFT Ksatdesisn = 106.32 in仙「x l.OxO.4xO.9 Ksatdesisn = 38.27 in/h「 For stormwate「 fac冊y design purposes, uSe a Ksat design㈲三20 in/h「 MountainMeadows 3I4　　3I8　　　4∴∴∴∴10　　　　20　　　40　　60　100　　200 100 90 80 ∽ の くo E70 ○ 言60 筆 舌50 の ⊂ 総40 (o ⊂し 宣30 α) 直20 10 0“ C \ i l )i i i l i 0.001 " " 曇 ト l 1 l )　　　i　　　　　　　　　　　　　　ll　l !TestPit#2atlO8.一 \ l・Samp-e2 " " " m m ○ 葛 S 喜 " 置 暮 菓 " m " S 喜 ○ " " " ○ 暮 ! I 100　　　　　　10　　　　　　　1Sample2　　　0.1　　　　-　0・01 bb G月ovel 上か〃d l　s′〃 ′ Coa鵬e ん花dllm 」照ne Ksat Ca看cu看ations Test pit#2 - SamPIe #2 taken at lO8一一below the existing g「ade Soil G「adation丁est ResuIts: DlO =　0.35 D60　=　7.4 D90　=11.2 怖nes=　0.0128 loglO (Ksat) =一1.57 + 1.90 (DlO) + 0.015 (D60) - 0.013 (D90) -2.08 (ffines) iog「O (庵at)こ-1.57十1.90 (0.35)十0.015 (7.4)一0・013 (11・2) -2・08 (0・0128)こ-0・9662 Ksat=　0.1081 cm/s Ksat=　0.1081 cm/s x O.3937 in/cm x60 s/min x 60 min仙「 Ksat= 153.19 in/hr E吐宣IPesian In冊t「ation Rate Caicuiation : K8at desicIn Ksat design = Ksat initial X CFT KsatinitiaI = 153.19 in/hr CFT (Total Correction Factor - Juiy 2016 SWMM) = CFvx CFtxCFm CFv = 1.0 (two tests pits, nO SO= variabiirty) CFt = 0.4 (grain size method) CFm = 0.9 (S冊ation & biofouIing) CFT=1.OxO.4×0.9 Ksat design = Ksat initiaI X CFT Ksatdesign = 153.19 in川「× 1.O x O.4 xO.9 Ksatdesisn = 55.4 in仙r Fo「 stormwate「 fac岬y design purposes, uSe a Ksat desisn(F) ≦ 20 in仙 星星星星星星 ∀M　　　　　　　　　　　　　　　M「]人 :曲塵皿瞭Idd- 一存灰汁7T￣　:Ⅱ∀0 帖 ▲害すo齢▼○○劃す動きH ⊥Y「d▲日▼NI動1「さすd 　　　日量州か鳩舶陸棚1鴫格l蝿噌寝的 ￣剥調　　　蜘 　強調りn櫨I蝕100櫨館腰山勘Ⅳ .飢7こ.し:「∀〇S :人80う納0ヨHO :人らiNM∀的 NV「d∃OYNIV曽q音o軸▼ S」議〇回V∃動軸i▼⊥Nno軸 ▲⊥i「i⊥∩　大鶴V軸iいi〃「ささd NolSいう轡 〕⊥∀0 ●ON 画 国書臆園田 \　　　　　　　そ〕 \　　　　　　　　　uつ //