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Home My WebLink AboutOWTS Engineers ReportPERCOLATION TESTAND O N-S ITE WASTEWATER TR EATTT'I E NT SYSTEÍT'I DES I G N 237 COUNW ROAD SILT, COLORADO Prepared For: J Caliber Construction Prepared By: CAPSTO'VE ENTERPRTSES WEST,LLC GEOTECHNICAL AND MINING ENGINEERING TESTING AND INSPECTION SERVICES ó18 PARTEE DRIVE GRAND JUNCTION, CO 8t504 PHONE (970) 250-555t June21,2O2O JobNo.455l CAPSTONE ENTERPRISES WEST, LLC GEOTECHNICAL AND MINING ENGINEERING TESTING AND INSPECTION SERVICES ó18 PARTEE DRIVE GRAND JUNCÏION, CO 81504 PHONE (970) 250-553r June 21 ,2020 JOB # 4551 Attn J Caliber Construction Rifle, CO Subject Percolation Test and On-Site Wastewater Treatment System Design for 237 COUNTY ROAD SILT, COLORADO At your request Capstone Enterprises West, LLC directed and observed the excavation of the two test pits to evaluate onsite soils for design of an additional On-Site Wastewater Treatment System (OWTS). The suitability of soils was evaluated by soil classification as prescribed by the Gadield County Health Department, and confirm by performing an abbreviated percolation test, The results of investigation and the percolation test with the OWTS design are presented in this report. lf you have any questions, or if we may be of further assistance, please do not hesitate to contact us. Respectfully Submitted: CAPSTONE ENTERPRISES WEST, LLC Martin W. Chenoweth, PE Registered Professiona I Eng ineer MWC CAPSTONE ENTERPRISES hlEST, LLC JOB NUMBER 4551 2 37784 rf PERCOLATION TEST Per your request, Capstone Enterprises West, LLC performed a percolation test for your 5 bedroom residence. The test was generally performed as prescribed by the Garfield County Department of Public Works' regulations updated on July znd,2018. The property is located in the southwest quafter of Section 36 Township 5S Range 92W. The following images show the site location as well as the location of the profile holes. C.APSTONE ENTERPRISES !{EST, LLC JOB NUMBER 4551 3 SITE DESCRIPTION ïhe site is essentially undisturbed grazing land with a portion being flood irrigated farmland. The site is virtually flat sloping slightly to the west at approximalely 2o/o. Two test pits were excavated to determine the soiltypes at this location. The profile hole was excavated to a depth of 9 feet. No free water was encountered to that depth, nor was there evidence of a seasonal high water table. The geologic logs of the profile holes are presented on the following page. CAPSTONE ENTERPRISES T^7EST, LLC JOB NUMBER 4551 4 TP-1 TP-2 0 Topsoil- Silty Clay w/ Roots SilÇ Clay w/ Gravel Debris Flow w/ Cobbles Debris Flow w/ Cobbles Tan Silt PI=5 Tan Silt PI=5 10 10 The soils at the site were consistent between the two excavations. Below the layer of cobbly debris flow, the soils that will utilized for the absorption bed are a Type 2A fine grain clayey silt (GR) with weak structure. To confirm this classification an abbrev¡ated percolation test was performed. A total of 2 perk holes were dug to evaluate the percolation rates. The holes were moisture conditioned as prescribed by Garfield County Health Department. And the percolation test was pedormed 24 hours after the initial conditioning. The results for the percolation test are presented on the following page. CAPSTOITE ENTERPRÏSES hIEST¡ LÏ,C JOB NU}4BER 4551 0 2 3 4 5 6 7 I 9 2 3 4 5 6 7 8 I 3 HOLE ID & DEPTH ELAPSED TIIUE m¡n. WATER LEVEL tn WATER DRqP in. PERCOLATION RATF min./in. PH-1 @ TP-1 28 -44 0.0 --3_0,-0 çqp 90.0 120.0 0.qQ ?.75 525 7ß3 9.50 0.00 2.75 5.27 7.63 9.50 16.00 PH-2 @TP-1 54 -70" 0.0 30.0 60.0 90.0 QA.0 0.00 1.00 2.00 2.88 3.63 0.00 1.00 2.O0 2.88 3.63 40.00 PH-3 @TP-2 56 -72 0.0 30.0 60.0 90,0 120.0 0.00 1.88 3.6? 5.38 6.75 0.00 l.8B 3.63 5.38 6.75 21.82 AVERAGE 25.9 Water Drop Vs. Elapsed Time 20.00 18.00 16.00 14.æ 12.00 10.æ 8.00 6.00 4.00 2.00 0.00 âo g CLo ê o .Eì ...+- Prt-1 @ tp.l +PH-¿g tÞ.1 '+p8-3 &rp.2 +Liñdt 20.û CAPSTONE ENÏERPRISES t']EST, LLC JOB NUMBER 4551 40.o 60.0 80.0 Elapsed Tlme {mlnutes} o_o 6 100.o 120.O The average of the for the last 30 minutes of the two-hour test was 25.9 minutes per inch. Capstone believes that the un-official percolation test confirms the classification as a type 2A soil. Based Garfield County Guidelines, the system has been designed based on a Long Term Acceptance Rate (LTAR) 0.50. Teble Aroa Soil Leval 9oll lype, fexluE, Sttu€lur. trld P€Éol¡tlü R¡lâ Soll Typ. USOA Soll Structurs- Cñdsusoa 3ôll l.rtuÞ 0.to Sheded rcæ çclie !yôt.m d6hô by e p6lè3sionâl Gnghær' Trcatnç¡l þvgls ¡re defôed in Tâble ô3 Unli¡od send tìte¡r jn th6e aoìl tyF¿s 3hall proyide pElhoge¡ .€moval. Desþn shall confom lo srdi6 'l f C.2.c Unlinod Send Fúlêß . Higher hng-tem æeptoñ€ ..tæ fq lro¿bmnt Level 3N may ùe arltrod lor OWIS Gquirod to havs s diech¡rg€ psmt, lf th€ €pabilrty Ol the dosþn to acfil€rc 6 h¡gh€r lang.term ¡eeplâe ñle €n be 3ubúa¡tlıl6d CAPSTO}IE ENTERPRISES !üEST, LLC JOB NUMBER 4551- NOÎE. I 1 Percolaùon Râte (tilPll Long-!3ñ Acceplânú Râlâ(LT RI; celloE p€r dsy prr¡qur. foot 1?ratñent Lffd ll u8o goil Strwhrs. Stup. l¡hlñÍm 3{Dol d..p unlln d r.ndlllt r nqulrd¡ Mln¡nilñ 2-tool dËt unlmd shd itût Eqrd0 (8hglt Grln)<50 Sol Tttr I rltñ moú û¡í 3C9l Rodr (>2mmr; 9olTtlr¡ 2{ tr,tt mo[ rñH !096 Rodr Þ2fl!t) 124 l.¡10 l.¡1001.25ISånd. Loamy Sðnd 1_000-e0 0.t0 1.002 (Moderate) 3 (Sùong) S¡ndy Loam, Loam, Silt Lôam o.t0 0.t{¡0.80 5.'15 0.50 0,60 t6.25 o60 eô o.70 41-60 0.35 0_¡o 0.60 0¡o 0.60 PR. BK. GR -0_g9*L PR, AK, OR PR (Prism¡lh) 8K (Blod(y) GR (Èaîular) 2.3 I (We6k) il!¿$iva 2 2A 3 Srndy Cl.y loF. C¡ôY lom, Silty Clôy Losm Ssndy LM, losm, S¡l Læm 0.60l¡!.hr 6r.75 0.30 0¡0 0.,rc8üdy Cht Loam, ClrtL{î, gryc¡y lorn PR8K, OR3 0.30 0.30 0.30 0.ctPn,9l( GR 2,r ?ègo 0.20a$r'{y Cbt, ChY, 8nt çlrt 0.r5 0.20 0.20 0.20 0.æPR 6K 6R 0 Mrshr 9t.120aå8.rr.lt cl¡y, C¡y, efy c¡v 0.r5 0,1t o.tı 0.r5t,2.t 121ç 0.t0Soll 1r9.t z-l P¡ly! WASTE WATER TREATMENT SYSTEM DESIGN The proposed residence for this site is planned to be a six (6) bedroom dwelling. Using the guidelines in the Garfield County On-Site Wastewater Treatment Svstem Reoulations, Effective Date: Julv 2, 2018 (OWTSR) the following sewage flow calculations were prepared : 5 Bedroom Residence Table 6-1 Q =6009a1.lday Once again using the OWTSR the absorption area was calculated. Where: A = Absorption Area in square feet Q = Design Flow of sewage in gallons/day LTAR = Long Term Acceptance Rate (From Table 10-1, OWTSR) 0 600 AREA == 1,200 sq ft LTAR 0.50 Base Area 1 ,200 sq. ft. Size Adjustment Factors Gravity Bed 1.2 Chambers 0.7 Total Absorption Bed Area 1,008 sq. ft. To obtain 1,008 square feet of absorption area a 12 foot wide bed 88 feet long (84 Chambers plus end caps) are required. A two compartment 1,SO0-gallon septic tank is required for this system. Capstone recommends that a concrete tank approved by Garfield County be used for this system. Detailed plans are attached. The following table shows the distance pertinent to this system. CAPSTONE ENTERPRISES WEST, LLC JOB NUMBER 4551 I c¡OoÞwrúU)ZFIwl{Hit trl,s Fl(¡ rrJøFPFÚFHRIU)trlU)HriFrc)43.7Minimum Disfances Between Components of an On-site Wastewater Ireafmenf Sysfem and Physical FeaturesTable 7-t Minimum Horizontal Distances in Feet Between Components of an On€ite WastewaterTr€atment System lnstalled AfterNovember I1973 and Waterand HealthFeatures\oSepticTank,Higher leveltreatmentUnit, DosingTank, Vaultor Privy5551010rc225101015Dry Gulch,Cut Bank,FillArea(from Crest)502503252525Lake,WaterCourse,lnigationD¡tch,Stream,Wetand50SubsurfaceDrain,lntermittentlnigationLateral,Drywell,StormwaterStructure't0ß225101025PropertyLines,Piped orLinedlnigationDitch,upslopecurtaindrain10ß2101010105010'tol515Structurewithoutbasement,crawlspace orfootingdrainsStructurew/basemenlcrawl spaceor footingdrains5020151515PotableWaterSupplyLine 2ß256252fi2ñ2252502502100 36060't00Spring,Well,1SuctionLine,PotableWaterSupplyCistemaBuilding Sewer orEffiuent LinesSTA Trench, STABed, Unlined SandFilter, Sub-surfaceDispersal S¡rstem,Seeoaoe PitLined Sand FilterLined Evapo-transpiration Fieldor Outside of Bermof LinedWastewater PondUnlined Sand Filterin Soil With aSeptic Tank,Higher LevelTreatment Unit,Dosing Tank, VaultorVault Priw Garfield requires that every OWTS be inspected by the to receive an occupancy clearance for the new construction. Please make arrangements with the engineer to schedule an inspection once the system is installed but before the bed is backfilled. The installer is responsible to maintain the appropriate offsets and grades. Any deviation from the plans must be approved by the engineer. The recommendations contained in this report are made in a manner consistent with the level of care and skill used by geotechnical engineers practicing in this area at this time. This repofi contains no warranty either express or implied. CAPSTONE ENTERPRÏSES h]ESÎ, LLC JOB NUMBER 455]- 10 DATE 6/19/20|SCALE 1"=100'OWTS GENERAL ARRANGEIVENT237 COUNTY ROADSILT. COLORADO8Y: MWCPROJECT NO. 4551wc6wEïf,@üIIRæ¡BØPSTONEEII'7ERPR¡SESCHK.DRWDESCRIPÏIONREVISION Inspection PortsCapped 12" Above GrouFILTER FABRTC OVER CHAMBERSUNCOMPACTED SOIL CAP4, PERFORATED DISTRIBUTION LINESENTIRE LENGTH OF BEDPERFORATIONS DOWN(MOUND 5olo)Chambers to Sit on SNtB6low CobHes MaxDepth 4.0 FtInspection PortsBED IN SECTION00Distr¡bution BoxBED MADE UP OF 84 QUTCK- |NF|LTRATOR CHAMBERS (OR EOU|V.)BED TO BE EXCAVATED LEVELOWTS GENERAL ARRANGEMENT237 COUNTY ROADSILT, COLORADODATE 2¡7120lscALE NtSBY: MWCCÁ.PSTONEËn ÌERPR.ÍS€SGffiU4ÑDf¡ffiÊrcsEW¡HßgN¡nsmfiÍMcs@ürrq@¡&CHK.DRWDESCRIPTIONREVISION