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Home My WebLink AboutEngineer's OWTS Design PlanHuddleston-Berry flr:ginrer'lng & '1. e sfiflg, LL'{ October 24,2024 Pro.ject#023 88-0002 Mr. Shane Wade PO Box 425 Silt, Colorado 81652 Subject:OWTS Design 1650 County Road 237 Tract 444 Silt, Colorado Dear Mr. Wade, At your request, Huddleston-Berry Engineering & Testing, LLC completed design of an Onsite Wastewater Treatment System (OWTS) for a single-family residence at 1650 County Road 237 Tract 44A 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, the northwest and northeast portions of the site were occupied by existing residences. The remainder of the site was open and gradually sloping down towards tlre south. Site topography is shown on Figure 2. Yegetation in the vicinity of the investigated area consisted primarily of weeds and grasses. The site was bordered to the north and east by residential/agricultural properties, to the south by 250 Road, and to the west by Harvey Gap Road. Subsurface Investieation As indicated on the logs, the subsurface conditions at the site were fairly consistent. Using visual-tactile classification methods, the soil profile consisted of I .0 foot of topsoil above tan to brown, moist, medium dense silt loam soils with a moderate granular structure that extended to the bottorn of the excavation in TP- I and to a depth of 5.5 feet in TP-2, (Soil Type 2). The silt loam soils in TP-2 were underlain by brown, moist, medium stiff, structureless sandy clay loam soils (Restrictive Layer). Groundwater was not encountered in the subsurface at the time of the investigation. However, saturated soils were observed at a depth of 4.5 feet in the test pits. In general, based upon the results of the subsurface investigation, HBET believes that the seasonal high groundwater elevation is deeper than 4.5 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 2789 Riverside Parkrvay Grand Junction, Colorado 81501 Phone: 970-255-8005 Info@huddlestonberry.com Appendix A: 1650CR237 Tracr44A A#02388-ooo2 ({IS$l},*::-1:?X."jnt0/24/24 \s/ Onsite Wastewater Treatment Svstem 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 bottorn of the proposed Soil Treatment Area (STA). As discussed previously, HBET believes the seasonal high groundwater elevation is deeper than 4.5 feet below the existing grade at this site. As a result, the bottom of the STA can he no deeoer than 0.5 feet below srade at this site. Therefore. a mounded svstem will be reauired at this site. This should be considered when establishing the elevation of the house to make certain that adequate fall to the STA can be achieved. Seepoge 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 Wastewater Treatment Sy,stem Regulations, effective July 2018. The proposed construction at the site is anticipated to include a four-bedroom home. However, the proposed construction contains an office with a closet. Therefore, the design will consider five bedrooms. Based upon the visual tactile classification of the soils, 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 SFXl.2X0.7) : 840 Square Feet # of Quick4 Chambers: (840 I 12):70 Chambersl Use 72 Chambers System Installation The installation of the septic tank, plumbing lines, Infiltrators, etc. should be completed in accordance with the Garfield County On-Site l{astewater 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 95o/o of the standard Proctor maximum dry density, within +2Vo of optimum moisture content. However, up to 3-inches of washed rock or pipe bedding passing the 1-inch sieve may be used as a leveling course under the septic tank and/or 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 r2o/o of optimum moisture content. Pipe bedding should have a maximum particle size of 1-inch.. Vehicular or heavy equipment traffic and placement of structures should not encroach within l0 feet of the septic tank or distribution box. 2V:\2008 ALL PROJECTS\o2388 , Share Wade\02388-0002 1650 Cornly Road 237-lract 44A\200 - Ceo\02388-0002 OWTSl02224.doc 1650 CR237 Tract44A #02388-0002 l0/24/24 @x*"*** Inspection Schedule Huddleston-Berry Engineering & Tcsting LLC should be retained to monitor the construction of the OWTS. 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. Verify proper fall between inverts.. Observe and verify installation of the absorption bed prior to placement of cover and backfill. ln conformance with Garfield County regulations, HBET will be required to provide the Garfield County Health Department with documentation certifying 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 Wayne D. Anderson, P.E Project Engineer a -lV:\2008 ALL PROJECTS\o2388 - Shile Wade\02388-0002 1650 County Road 237 Tract 444\200 - G@\02388-0002 OWfSl0222.l.doc F'IGURES FIGURE 1 Location Project No.: 02388-0002 Datet 10124124 By: WDA Hudflcgm-Fsnf F*gi*eakrg & t*rrixg; I,lC 2789 Riverside Parkway Grand Junction, CO 81501 FIG 1650 PAR REPAIR SEPTIC TANK WITH ,I,5OO GALLON CAPACITY 11' (1 0' 'NOE -N(ANDBED c0NsnucioN 11' (1 0' SCALE: 1":50' C.l. = 2 FT A TEST PIT NEW RESIDENCE MIN) ''..t.-. LINE EXISTING DRIVEWAY ]R 237 TRACT 44A :EL#21272s400042 IRE2-SITEPLAN NS A+ROXIMAE ND MY SH SNE DURING rTE IOP(mW @NS ffi €BCE. ANDrcR OBER BLESMCKS ARE M* ACfuAL LMNON G TNK AND GENERALIZED SYSTEM PROFILE NOT TO SCALE RESIDENTI[ STRUCTURE (AS NECESSARY) LOS AE ATTHAT CLEANOUTrscH. €0 o[Yr AIIryE FIMSH EN EST TO s,0 FT 1,0 FT XIN. CNVER 2 CENPARTffiNT SEMIC FROT CNffi APPMVED LIST IN OUTLET FILIER IEE **BOTTOI{S OF CHAMBERS 0.5 FEET BELOW EXISTING GRADE MAX GENERALIZED BED PROFILE NET TE SCALEr------- --------lI rn-TgRgroohrENSroNS=oNEtz'xzzBED II {Boys9r lEQUtcK4STANDARDTNFTLTR.ATORSOR I; ENGINEERAPPROVEDEQUAL I L-------- ______J IN-FILTRATOR SYSTEMS QUI CK4 COVER SOIL: NATIVE SOILS OR OTHER SUITABLE TOPSOIL. GRADE TO CARRY SURFACE WATERSTANDARD BED. MAX.3H:lV SLOPE 3H:1V SLOPE 0.5' NATIVE DMINING MATERIAL NEEDLE PUNCHED. GEOTEXTILE OF CHAMBERS FABRIC IMMEDIATELY ABOVE CHAMBERS 0.5 FEET BELOW EXISTING GRADE MAX MINIMUM SETBACKS (UNITS: FT) $ 1@ s vru tr a t0 VIE Lre rc 6 o ffi rucil, uBNmru t0 10 10 l.M DtId 10 f LMro $ $ I lff, STtr,lmUB 4 5 !ELq6 lmIo@W f 10 l0 man uE i*OTHER SETBACKS NOT LISTED HERE SHOULD BE IN ACCORDANCE WITH GARRELD COT]T{TY OWTS RECULATIONS Project No.: 02388-0002 Date: 10124124 By: WDA Huddlartan-.Bwry Enginrming & Ferring, {,1..C 2789 Riversjde Parkway Grand .lunction, CO 81501 FIGUR 1650 PAR DETAIL AREA SCALE:1"=30' INSPECTION PORTS 5' I I I I WATER BOTTOM CALLON NlINIMUM TOP OF 2-FOOT SHOULDERENGIN.EERAPPROVEDEQUAL DISTRIBUTION BOX THAT ENSURES EVEN DISTRIBUTION OF EFFLUENT 4-INCH DIAMETER SEWER AND EFFLUENT PIPE MEETING ASTM DI SCHEDULE 40 OR SDR 35 4 ROWS OF l8 QUICK4 S ANDARD INFILTRATORS I SEPTIC TANK WITH NEW RESIDENCE 237 TRACT 44A 3 - SEPTIC SYSTEM DETAILS 12725100042 **usE swEEP 90's oR TWO 45',S AT 90 DECREE BFNDS** APPENDIX A Typed Test Pit Logs No o tsoo fiiI @l Fz o PROJECTNUMBER O23BB-OOO2 PROJECT ltlAME 1650 Countv Road 237 Tracl44A PROJECT LOCATION SiIt, CO CLIENT Shane Wade Huddleston-Berry Engineering & Testing LLC Riverside Parkway TEST PIT NUMBER TP.1 PAGE 1 OF 1 Grand.lunction, CO 81501 970-255-8005 GROUND WATER LEVELS: AT TIME OF EXCAVATION AT END OF EXCAVATION AFTER EXCAVATION --- DATE STARTED 9126124 TEST PIT SIZE DTV Drv EXCAVATION CONTRACTOR Client COMPLETED 9126124 CHECKEDBY MAB GROUND ELEVATION NOTES EXCAVATION METHOD Trackh/Backhoe LOGGEDBY TC ATTERBERG LIMITSIIJ(L>tFul ;gcoJ>(L->2 a s t^qE gE- H au>Fl Yr<do>OZ FzulFzOGoe) U) UJztr € IF(L ulo 0.0 IIrn +E (, MATERIAL DESCRIPTION 2 trJ tLr-Gitt @ Oo o_ 5 F^205e Eo l1l;st- -F '/)U.l oz>o() o, ?= j- OtrFu)s1=(L F0t 42 L!.'.! iM 'v{'r,. ^i t) ,....' 1 Sandy Clay with Organics (TOPSOIL) Silt Loam, tan to brown, moist, medium dense, moderate granular structure (Soil Type 2) **Saturated Soils at 4.5 Feet Bottom of test pit at 5.5 feet. Im r!o Foq @ J al tszo Io< Fo ftF N No o& EFlooo @ az:fJoo I m Huddleston-Berry Engineering & Testing, LLC 2789 Riverside Parkway Grand.Iunction, CO 81501 970-255-8005 PROJECT NAME 1650 Countv Road 237 Trad 44A PROJECT LOCATION SiIt, COPROJECTNUMBER O23BB-OOO2 CLIENT Shane Wade TEST PIT NUMBER TP.2 PAGE 1 OF 1 GROUND ELEVATION GROUND WATER LEVELS: AT TIME OF EXCAVATION Drv TEST PIT SIZE EXCAVATION METHOD Trackh/Backhoe COMPLETED 9126124 CHECKEDBY MABLOGGEDBY TC AFTER EXCAVATION ---NOTES DATE STARTED 9126124 EXCAVATION CONTRACTOR Client AT END OF EXCAVATION Drv ATTERBERG LIMITSuJL>trF t-U ;g coJ>O-->2 U) s t^ 96 85 LLlt au >2=Yr<60>o= z IUL FCirg Ooo- bs 205s Eo tl-l o\t- 'olJ -roz>oO Qr- a= l- O FLu)=5= o_ Fail 42 Fz UJFzOGo9)arljztr IF(L trJo 00 IIrno-X#:(, MATERIAL DESCRIPTION f,:;.1 17'ttr) r. '.i i:'.-:-. ':-T.'1 Sandy Clay with Organics (TOPSOIL) Sili Loam, tan to brown, moist, medium dense, moderate granular structure (Soil Type 2) **Saturated Soils at 4.5 Feet Sandy Clay Loam, brown, moist, medium stiff, structureless (**Restrictive Layer".) Bottom of test pit at 5.5 feet.