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Home My WebLink AboutOWTS DesignHuddleston-Berry Engineering & Testing, LLC 2789 Riverside Parkway Grand Junction, Colorado 8 1501 Phone: 970-255-8005 Info @huddlestonberry. com March 16,2021 Prcject#02205-0001 Casey Sheets 59 County Road 317 Rifle, Colorado 81650 Subject: OWTS Design Parcel 217927101002 Silt, Colorado Reference: Geotechnical Investigøtion, Pørcel 217927101002, Silt, Colorado by Huddleston- Berry Engineering & Testing,LLC for Casey Sheets, February 24,2021. Dear Mr. Sheets, At your request, Huddleston-Berry Engineering & Testing, LLC completed design of an Onsite Wastewater Treatment System (OWTS) for a single-family residence at Parcel 217927101002 in Silt, Colorado. The site location is shown on Figure I - Site Location Map. A site plan is included as Figure 2. Site Description At the time of the investigation, a small out-building was located in the northern portion of the site. The remainder of the site was open. The site sloped down towards the southwest. Site topography is shown on Figure 2. Vegetation consisted of weeds, grasses, and small to large bushes. The site was bordered to the north, west, and east by open land, and to the south by Alta Mesa Road. Subsurface Investigation As discussed in the referenced report, the subsurface conditions at the site were fairly consistent. The test pits generally encountered 1.0 foot of topsoil above brown, moist, stiff lean clay soils to the bottoms of the excavations. Although groundwater was not encountered during the subsurface investigation, HBET believes that the seasonal high groundwater elevation is between 8 and l0 feet below the existing grade at this site. The locations of the test pits are shown on Figure 2. Copies of the test pit logs are included in Appendix A. Parcel2l7927l0l002 Ã#o22os-ooor (ilB;JlTi,*ln*ï;l:703/t6/21 \ø Onsite Wastewater Treatment Svstem In order to evaluate the soils for Onsite Wastewater Treatment, percolation testing was conducted at the site in accordance with Garfield County regulations. The percolation rate in the native soils was determined to be approximately 12 minutes-per-inch. The percolation testing data are included in Appendix B. In accordance with Garfield County regulations, a percolation rate of between 5 to 60 minutes- per-inch is required for soils to be deemed suitable for onsite wastewater treatment. Therefore, based upon the results of the percolation testing, IIBET believes that the native soils are suitable for onsite wastewater treatment. In addition to the percolation rate of the subsurface materials, the seasonal high groundwater elevation is an important factor in determining the suitability of the site for Onsite Wastewater Treatment Systems. For OWTS suitability, the seasonal high groundwater elevation should be at least four feet below the bottom of the proposed absorption bed. As discussed previously, IIBET believes that the seasonal high groundwater elevation is between 8 and 10 feet below the existing grade at this site. Seepøge Bed Design The design of the absorption system generally follows the requirements of the Garfield County Department of Public Works as outlined in the Garfield County On-Site Wøstewater Treatment System Regulations, effective July 2018. The proposed construction at the site is anticipated to include a four-bedroom home. Based upon the soil percolation rate, a Long-Term Acceptance Rate (LTAR) of 0.6 will be utilized for the absorption field design. Infiltrator Systems Quick4 Standard Chambers are proposed. The daily flow of the sewage disposal system is calculated below and a plan and profile of the absorption system are shown on Figure 3. Average Daily Flow: (8 persons)(75 GPD/person) :600 GPD Soil Treatment Area: (600 GPD / 0.6¡: 1,000 Square Feet Adjusted Soil Treatment Area: (1,000 SFX1.2X0.7):840 Square Feet # of Quick4 Chambers : (840 / 12¡:70 Chambers; Use 72 Chambers System Installution The installation of the septic tank, plumbing lines, Infiltrators, etc. should be completed in accordance with the Garfield County On-Site Wastø,vøter Treatment System Regulations and Infiltrator Systems, Inc. specifications. In addition, the following construction procedures are recommended:. The septic tank and distribution box should be placed level over native soils that have been scarified to a depth of 8 to 12 inches, moisture conditioned, and recompacted to a minimum of 95Yo of the standard Proctor maximum dry density, within +2o/o of optimum moisture content. However, up to 3-inches of washed rock or pipe bedding 2V:U008 ALL PROIECTS\02205 - Cæ€y Sheelr\02205-0001 Pucel 217927101002900 - Geo\02205{001 LR02262l.doc Parcel 217927 101002 #02205-0001 03116/21 Huddleston-Beffy passing the l-inch sieve may be used as a leveling course under the septic tank anÜor distribution box.¡ The bottoms of trenches and backfill around the septic tank and distribution box which will support sewer or effluent lines should be compacted to at least 90 percent of the standard Proctor maximum dry density, within +ZYo of optimum moisture content. Pipe bedding should have a maximum particle size of l-inch. . Vehicular or heavy equipment traffic and placement of structures should not encroach within 10 feet of the septic tank or distribution box. Inspectíon Schedule Huddleston-Berry Engineering & TestingLLC should be retained to monitor the construction of the OV/TS. The following schedule of observation and/or testing should be followed: . Observe the absorption bed excavation prior to placement of Infiltrator chambers. . Observe placement of the septic tank, distribution box, and all connecting sewer and effluent lines prior to backfill. Veriff proper fall between inverts. r Observe and veriff installation of the absorption bed prior to placement of cover and backfill. In conformance with Garfield County regulations, IIBET will be required to provide the Garfield County Health Department with documentation certiffing that the OWTS was placed in conformance to the plan and profile and Garfield County regulations. General Notes The OWTS design was based upon the results of the subsurface investigation and on our local experience. The design is valid only for the proposed construction. We are pleased to be of service to your project. Please contact us if you have any questions or comments regarding the contents of this report. Respectfully Submitted: Huddleston-Berry Engineering and Testing' LLC Michael A. Berry, P.E. Vice President of Engineering f¡¿inN¡hE{ lc{ins. l-l < 3V:V008 ALL PROJECTS\02205 - Csey Sheet¡\02205-0001 Ptcel2l'1927101m2\200 - Geo\022054001 LR02262l.doc FIGURES GarfuId County2123t2021Garfield County Land ExplorerGmrfïeld Çerunl-y Col*rsrir¡ fi-and frxpicrer q O A I ÊPrint*,t äLocation MapcopyCSVPDFPrintResullsSeorch: rOwnerPorcêlPhyslcolAddress! lOministrative BoundariesI rns & subdivisionsI nrra nowfl water FeaturesI zoningBosemopLocoteBuffer217927101002SeorchI lll¡ êij-îLabelsDrowMeosureSHEEÍS, CASEYADAM & DUSTYLEAH33I COUNW RDSILThttps://maps. garfield-county.com/landexplorer/1t1 PARCEL#217927101002FIGURE2-SITEPLANHuddleston-BerryEngineøing & Testing, LLC640 White Avenue, Unit BGrand Jrmction, CO 81501Project No. : 02205-000 1Date: 03/1612lBy: MABMINIMUM I,250GALLON TANKWATERNEWSHOPSCALE: I'r:60rl- -lREPAIR AREA-ì- ìt- IllllttlllltlttNATURAL PONDROAD ROWAND UTILITYEASEMENTN+q@ tññBÐtæ^¡dsmENuYflEwEl)lreFÆMßLNÆflruSEIMÆF- MILdMOFIAXNBÐ WU BE tÞtqÞ d MtrÎÞilmé."SCALE: l":200'C.I.: IO FTA TESTPIT DETAIL AREA**usE swEEP 90's oRTWO 45'S AT 90DEGREE BENDS**SCALE: 1":30'NWATERLINESEPÏC TANKIPTTHM]NIMIJM I,250GALLON CAPACITY4-INCH DIAMETER SEWER ANDEFFLUENT PIPE MEETING ASTMD1?85, SCHEDULE 40 OR SDR 35DISTRIBUTON BOX THATENSURES EVEN DISTRIBUTIONOF Effl,UgtrttSYSTEMS QUICK4STANDARD CHAMBERSINSPECTIONNEWSHOPNEWHOMEPARCEL#2l7927lOlOO2FIGURE3-SEPTICSYSTEMDETAILSHuddleston-BerryEngineøing & Tesring, l,l.C640 White Avenue, Unit BGrand Junction, CO 81501Project No.: 02205-0001Date: 03/16/21By: MABGENERALIZND SYSTEM PROFILENOT TOSCALERESIDENTIALSTRUCTURERISERS (AS NECESSARY)THAT LIDS ARE AT ER]NFILTRATER OUICK4STANI]ARD CHAMBERSFiNISHEDr.O FT TIN. COVEREN EFFLUENTEST, 6.0TA 8,0 FTEST, 2,0 FT4.0 Fl HAX,1.0 FT ÍIN. CtrVERDISTRIBUTIEN BOXTANKGENERALIZE D BED PROFILENOT TTSCALEINFILTRATOR SYSTEMS QIJICK4COVER SOIL; NATVE SOILS OROTIIER SUTIABLETOPSOIL. GRADE TO CARRY SIJRFACE WATERAWAYFROMBED.STANDARDNONWOVEN, NEEDLE PTJNCHED.FABRIC IMMEDIATELY ABOVE CHAMBERSMINIMUM SETBACKSGINITS: F r)PMERIY LMt0¡0l0WCCFÐMUING5DVÉUCæLAKE, SreA¡,UW DNCHsssRD@EDELDSt0¿5t0LNED DIrcHt0¡010qED PTPE1025¡0VAER 8Et0610vILs5010050**OTHER SETBACKS NOT LISTED HERE SHOTjLD BE IN ACCORDANCE WITH GAR¡IELD COUNTY OWTS REGTJI-ATIONS APPENDIX A Typed Test Pit Logs GEOTECH BH COLUMNS 02205-OOO1 PARCEL 217927IO1OO2.GPJ GINT US LAB.GDT 3/16/21!7tPmozc=trmÐoNNootooootrmzoÐØoØJooø€^¡,JrÉôst æx.r-E €ËHtæËæE .i oacã ?úÕ ôw-ÞoEô o"(o+FæStÞGE F'oàË0cR"Èo$.sc14r{c)Ëmo{ãI-2l-!aoLfflo-.1zÞ=m!0)ãoN)\¡(oN){oooN{mU,{!{zc=trmn{!!I!omoTIzomU'5oomE,@ØEmx(lIız=m{¿oE'mxo2Þızooz-{Fcl-{ov=4oE'Þ{mv,Iv{mE,t-l-oo=!m-{mE'-{ñoxt@ÀtoFJooa¿flloxlfiE,EID(tf\)ovoIHäñËiiH| 29onoczE'mmIızo¿o.e{mv,-{!g,NlfloDEPTH(ft)GRAPHICLOGImÐFt-omU'on!IozSAMPLE TYPENUMBERRECOVERY %(ROD)BLOWCOUNTS(N VALUE)POCKET PEN.(tsODRY UNITWT(pcr)MOISTUREcoNTENr (%)+r-{=m=v-{ ID(DmFoFINES CONTENT(T")LIQUIDLIMITPLASTICLIMITPLASÏCIryINDEXi¡ì,1. iì, lí:\ t/-. ,\ .t/raq)o(/,û¡:CLÉ.Jo@g¡fı'U'-{o!ØIrt-0)cta!,ØØooo@U)Â¡fot-oo,:Jot-or-vctıÉ_f3o6'Ø4ooÀ\¡fJto(s-oTDNNOr(tlo(tl@oo3oooE.q)(oiãoo GEOTECH BH COLUMNS O22O5'æ01 PARCEL 217927.101002.GPJ GINT US LAB.GDT !1612'I!7om(){zc=@fllvotrmzontU'oU'Joo6()NNo(¡ooo\o\¡¡.)æoooc)oæÞF\äæxrioä?ôwôoF.t+ErSE<tr@oÈi0aR"Èo0eþ.)tnoGm()!vog.mC)z=m5oIızq=oo!ÐãoN\¡(ol\){oooI\){m@{3{zc=@mn{!I¡Ìtomo-Ttzo-.tmat,5oomE,Eo¿H¡mE'Emxo¿D-{ız=m-{¿o0mxclÞ{ız()oz-{7c'-{ovoImU'{Þ7{mI(¡)(rlt\,-l0)oxJ@oo-=oooı'JIDoo=!mmoo7oczc,mmÞızo7to+tt=ilHeñlËËH-2ã3.--r 9ıt-Zo.¿CL?mU,-{!-{9)NmoôDEPTH(fr)GRAPHICLOG+m7t-trmU'o7!IozSAMPLE TYPENUMBERRECOVERY %(ROD)BLOWCOUNTS(N VALUE)POCKET PEN.(tÐDRY UNIT WT(pcOMOISTURECoNTENT (%)-{=msÐ-l(DørmnoFINES CONTENT(%)LIQUIDLIMITPLASTICLIMITPLASTICITYINDEXÌ\)Ø!,fo-oçc.vctðÉf39.(hf+Øllli\t\.\\.\oı-oU'z0v)ov0)_f3o.Øf+oofU'oIDoc'3ooøp.D)ctb(Dor+ PAGE 1 OF 1 TEST PIT NUMBER TP.2 PROJECT LOCATIONPRo.JECT NUMBER PROJECT l,lAIlE Parcel 217927 101002CL¡ENT Casey Sheets Huddleston-Berry Engineering & Testing, LLC Riverside Parkway Grand lunction, CO 81501 970-255-8005 GROUND WATER IEVELS: AT TIME OF EXCAVATION AT END OF EXCAVATION AFTEREXCAVATION .- TEST PIT SIZE drvTrackh/Backhoe drvCHECKEDBY MAB GROUND ELEVATION Hi-RiverEXCAVATION CONTRACTOR COMPLETED I/I5l21DATE STARTED 1115121 EXCAVATION METHOD LOGGEDBY SD NOTES ATTERBERG LIMITSØu>l-l ^ZJãasoz z IJJÀr-Cug ooo- F3tzl É.o oo. lll o\É.-¿z tD !ro2>oo Ou l= J- otrF 3= Þ 0ñ 42 0- Fz uJt-2OG(J3) U'uz IL ul o->frFUJ!g0-=>z (/) s É.-qä 8s u TF o_ l¡Jo Ð o Irn*ët-o MATERIAL DESCRIPTION Clayey Sand with Organics 2.5 Sandy Lean CLAY with some GRAVELS (cl), brown, moist, stiff Bottom of test pit at 9.0 feet. oôô 'åoNNo U)z fJoo Ió Ioutsouo NIÈFÉ.t¡Io=fztso-l-(f,IJJFILoLrJofLôlooot*(\O)l\ñtıcG0-zoF(,oJ(JulìoÉ.o.l¡¡-z(JuJaÉ.ÈOF¡JÞôtrot-ùÞ0trooÉ'50Éf¡lÞoqEIoo€daà:XælZnÆoooo|f)o(\(\¡ooËö'&jonËıÊæEh-rtEq.ÉôUôøooTØcuncÉ,t¡Jo=ÐzFot¡¡IoÉ,Àt-zl¡Jfot¡.tNıFÀu,t¡.IF¿!¿!tôe In3.saäË*tÉäaHãEiu3ozoEl¡lt¡Jozfoú,o(\,lro(Ðc0aDt¡¡FozouluJÈ=ooo)otl¿(,(!dt.cvo(EFoclulY(Jl!¡C'c.9ı(\¡¡o(Y)c¡t¡¡É.at,t¡¡FoÉ,ol-(JÉ.Fzoozo<I(Jxl¡looIFl¡,1Ezot-{(JxlrloU)oot¡lc,(9oJ(u)HIdfOqo901CIHdVUÐzot-o-e.oU'lrJoJÉ.lrJFuls!ïnN3d^l f-ldyr¡vs(oou)o/o ÄU3ÂOC3U(¡nrvn ru)srNnoSMO'tEGsÐ'N:ld IfYSOd(¡cd)IJV\ IINN AUO(ø).1r.¡¡rruocfunrstol¡úoÉ.uØd¡FffiEF:Jt-(v,)rNsr_NO3 SSNllIt ¡nornorlltyìll'lctrsvldXSONI^l_tcU_svldI()u?c.,tEtt,Ø'ıEi3oo,.ì.ofo!tCtúU)o6oo.9.oEiooct)ozU)6)-g()d¡oEoIEøø-g(_)¡)(úJ¿)dtCÐ¡oıt(oO¡(Ð(9o0)c(o(!=CLØo)oEoËodltagre toe'evt sn -LNtÐ rd9'z00t0rlz6ltz13cw¿ t000-90220 sNtrnloc H8 Hc3J.o3e GÊOTECH BH COLUMNS 02205-OOO1 PARCEL 217927101002.GPJ GINT US LAB.GDT 3/,16/21!voLmc,zc=Em7otrmzoÐØoU'too6oN)NoOrooo€ ^ ¡..J !l.t{ff-)t:foDj æx-r- u þ=Çtl &cto!t (i oasä ?uo ôw.FtDEô o"kv¡tl1ræ3dq;E F'oàË0cF¡!'rtOQ"Fo!nImo{5oÞıztvomo{2-m!q¡ãe.l\)\¡(l'N\¡oooN4oo{fnØ{!{zc=-EItnil,n-{çP- (¡tzo{m(t,FMoxoo83PËU,=om¿oE,mxc¡ÞD{ızoozão{o7IT'4oo-{mttt-{ÞvmE,(,tN-{ıot(D0tc)xJooa¿moâmE,@TDoo=!mmo(,lNovo+tt=ilËgñlËsH9ã5.-.r9ı,22oÐoCzommÞ{ızCLeCLe-{m]t!9,NmcDEPTH(n)GRAPHICLOG-.1mnrom(no2!_-lozSAMPLE TYPENUMBERRECOVERY %(RAD)BLOWCOUNTS(N VALUE)POCKET PEN.(ts0DRY UNITWÏ(pcOMOISTURECoNTENT (%)-{r-{=ms,l-l(D(DmvoFINES CONTENT(%lLIQUIDLIMITPLASTICLIMITPLASTICITYINDEXÇ ..t\-. :l)> Jl'..¡-: r;..i-,i ; ¡2;.t.ì .'¡:-. .,.1. j"t..'*ìo0)oØ0¡foÉ.=loð0)fı'ø-to!Øot-5l",l-ØofCLt-oA¡=orc)vqıÉ-J3oø5iø(Do*o3ooanE.q)¡ooo!+ Huddleston-Berry Engineering & Testing, LLC 2789 Riverside Parkway Grand Junction, CO 81501 970-255-8005 TEST PIT NUMBER TP.3A PAGE 1 OF 1 PROJECT Ì{AME Parcel 217927101002 PROJECT LOCATION SiIt. COPROJECTNUMBER 02205-OOO1 CLIENT Casey Sheets GROUND WATER TEVELS: AT TIME OF EXCAVATION AT END OF EXCAVATION AFTER EXCAVAT]ON -- TEST PIT SIZE drv drySD COMPLETED 3/5/21 CHECKEDBY MAB EXCAVATION METHOD Trackh/Backhoe GROUND ELEVATION LOGGED BY NOTES DATE STARTEO 315121 EXCAVATION CONTRACTOR Client ATTERBERG LIMITSulo>úF I.IJ 5gO-f>z ø s g8 8s H ØuèFf E=¿ıo>oz z lrJ o- t- uJ\looo- ø t-3 F^ =EÉ.o s Fz uJFzoO ulÉlF U) o 8r- a= J- otrF 3= F ;-i xYull-ñ(t) -f=À t-z uJFzOGo9l U) uJztr IF o_ lrJ6 o.o o ËE frY(, MATERIAL DESCRIPTION 25 GRAVELS and COBBLES in a Silty SAND matrix (sm), tan, moist, loose v 3 23 l6 7 44GB 1 Silty Clayey SAND (SC-SM), brown, moist, dense **Lab Classilied GB-1 Bottom of test pit at 6.0 feet. ¡ -ta ¡ a ¡ o I .¡ ¡ a Þoq Éfol Fzo aq Noo o NNoF N JUo É. À ooô boNNo .J)z2fJoo I6-oUtsouo GINT US LAB.GDT 3/16/21!7'ocmozc=EmvoNt\)oOrooootrfilzo0)øo(nJooø\o\¡$æooÞ.ÈoötôäItq9.ËôoûaR".loËsqFC)!7omo-{5o-{ıza-oo!vgm(){z=m!0,ooñ\¡(oN{oooÀ){mØ{!{zc=@mn{!A!omo.ïlzomtttooomEEØomxc'D{ız=m{¿oo{ıo-@ÐC)x=oomxC'D-{ızoozvoIonT7oo{man-{Þ7-{mo(rtNofmoxmE,E=(D()o3!m{mE,(tNouo+tt=ilËcñlËsHeãf6r9ı,22ovoczommIızqeo.¿{mattILNñoDEPTH(ft)GRAPHICLOG-{mÐr-om@on!JozSAMPLE TYPENUMBERRECOVERY %(ROD)BLOWCOUNTS(N VALUE)POCKET PEN(tsf)DRY UNITWT(pcf)MOISTURECoNTENT (%)-{r-{=ms,l-l(DU'ffiÐoFINES CONTENT(Y")LIQUIDLIMITPLASTICLIMITPLASTICITYINDEX',ìr. l/j..1\...1,> jl. ..r-. r).' lzt/j .ti .¡ll,.'ì\. .¡/_ ¡r\.. PÈ r¡4._.r\ . t.,. t\ .t,a0¡oØ0,=CLÉ.JorãÊ,fô6-{oTØIt-ol^,Ø!tfCLt-oo)foFc)::-ctoÉ-f39.ø5+ln(Doo3ooØp.0)so(Do APPENDIX B Percolation Testing Results Project Name Parcel 217927101002 Testing Conducted By S. Dinterman Pit Dimensions Water Level Depth SOIL PROFILE De Descri n Test Number: PERCOLATION TESTING Not Encountered X Test Number: Top of Hole Depth: Diameter of Hole: Depth of Hole: Location: S co Supervising Engineer:M. Berry ; Width Top of Hole Depth: Diameter of Hole: 4-in. Depth of Hole:17-in Time (min.) Water Depth (in.) Change (in.) 0 1.125 5 1.875 o.75 10 2.5 0.625 15 3j25 0.625 20 3.75 0.625 25 4.25 0.5 30 4.75 0.5 35 5.25 0.5 40 5.75 0.5 45 6.25 0.5 50 6.5 0.25 55 7 0.5 60 7.25 0.25 12Rate (min/in) Depth 4.0 ft Remarks Test Number: Top of Hole Depth: Diameter of Hole: Depth of Hole: TP-3 roject No Pit No 111512021 0-1 ft Clavey Sand with Orqanics (TOPSOIL) 1-4ft Sandy Lean CLAY (CL), brown, moist, stiff Time (min.) Water Depth (in.) Change (in.) Time (min.) Water Depth (in.) Change (in.) Average Percolation Rate (min/in): Rate (min/in):Rate (min/in) PERCOLATION TESTING Project Name Parcel 217927101002 Location: Silt, CO Testing Conducted By:S. Dinterman Pit Dimensions Water Level Depth SOIL PROFILE De Descri n Test Number:1 Supervising Engineer:M. Berry ; Width Not Encountered X Test Number: Top of Hole Depth: Diameter of Hole: Depth 3.0 ft Remarks Test Number: Top of Hole Depth: Diameter of Hole: Depth of Hole: Top of Hole Depth: 3 ft Diameter of Hole: 7-in. Depth of Hole 11-in.Depth of Hole Time (min.) Water Depth (in.) Change (in.) 0 1j25 5 '1.875 0.75 10 2.5 0.625 15 3.125 0.625 20 3.75 0.625 25 4.25 0.5 30 4.75 0.5 35 5.25 0.5 40 5.75 0.5 45 6.25 0.5 50 6.5 0.25 55 7 0.5 60 7.25 0.25 12Rate (min/in): 0-1 ft Clavev Sand with Orqanics (TOPSOIL) 1-3 ft Sandv Lean CLAY (CL), brown, moist, stiff Time (min.) Water Depth (in.) Change (in.) Time (min.) Water Depth (in.) Change (in.) Average Percolation Rate (min/in): Rate (min/in):Rate (min/in)