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Home My WebLink AboutOWTS Engineers ReportÈlEü*,. . , I29 CAINS LANE CARBoNDALE, CO 4I623 970.309.5259 CARLA. OSTBERG@GMAIL. COM GAITFIFL.D CL', )|ô iri t.lNIl'y nEVEL(, sfi:l"rr( : (.:(.)l\!tt tr,T ri\ (i September 10,2022 Project No. C1739 Jen Hiatt i n h@hiatthallenbeck.com Subsurface lnvestigation and Onsite Wastewater Treatment System Design 2-Bedroom Residence 1BB4 CR 120 Garfield County, Colorado Jen CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 36.O2-acre property is located outside of Glenwood Springs, in an area where OWTSs and wells are necessary. Legal Description: Section: 1B Township: 6 Range: 88 Subdivision: LOOKOUT MTN. RANCHES RANCH 29 36.02 ACRES Parcel lD: 2187 -181 -02-029 SITE CONDITIONS The property is currently undeveloped. A 2-bedroom residence is proposed. The residence will be served by a well on the property. The well is located to the northeast of the proposed residence. The well will feed a cistern, which will be positioned to the northwest of the residence. Both the well and the cistern are greater than 5O-feet from proposed septic tank and greater than 10O-feet from the proposed soiltreatment area (STA). The proposed soiltreatment area (STA) location has an approximate 17-18 percent slope to the southeast. The proposed area is located southeast of the residence and south of the driveway. The area is vegetated with trees (which will be cleared)and native grasses. There should be no traffic or staging of material over the future STA site to avoid compaction of soils prior to construction of the STA. SUBSURFACE The subsurface was investigated on June 14,2022 by digging three soil profile test pit excavations (Test Pits). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.l The materials encountered in Test Pit #1 consisted of dark brown loamy topsoil to 3.O-feet, underlain by light brown sand with a loam matrix to a maximum depth explored of 6.0-feet. No bedrock or groundwater was encountered. ' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Traíning. Page2 The materials encountered in Test Pit #2 consisted of dark brown loamy topsoil to 3.0-feet, underlain by light brown sand with a loam matrix to a maximum depth explored of 6.0-feet. No bedrock or groundwater was encountered. The materials encountered in ïest Pit #3 consisted of dark brown loamy topsoil to 3.0-feet, underlain by light brown sand with a loam matrix to a maximum depth explored of 8.O-feet. No bedrock or groundwater was encountered. The soils are a matrix of loam and sand. Soils are classified as Soil Type 2, Sandy Loam. A long term acceptance rate (LTAR) of 0.6 gallons per square foot will be used to design the OWTS. Test Pit #1 Backfill View of Test Pit #1 Page 3 Test Pit #2 Backfill Sand matrix (single-grain) Some photos are missing as they are in a format which could not be inserted into the Word document. DESIGN SPECIFICATIONS Desiqn Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 2 Bedrooms = 300 GPD LTAR = 0.6 GPD/SF 300 GPD / 0.6 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 350 SF Page 4 The OWTS design is based on 2-bedrooms. An average daily wastewater flow of 300 GPD will be used For the purposes of this OWTS design, Benchmark Elevation has been established as 100' as the Finished Floor (FF) elevation of the residence (7842.5'). CBO lnc. should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. *Elevations are based upon standard OWTS installation practices. Component elevations may change during installation due to site conditions. Minimum grade refers to piping between components. The 4-inch diameter Schedule 40 sewer line exiting the residence must have a double-sweep clean out and a minimum 2o/o grade to the septic tank. Minimum Schedule 40 sewer line is required under areas subject to traffic. The system installation must include a 1O0O-gallon, two-compartment septic tank (state-approved concrete or poly)with an effluent filter on the outlet tee. Risers must bring the manhole lids to grade for access. lf more than one riser is added to the septic tank, an extension handle must be installed on the effluent filter. Effluent will gravity flow to a distributlon box, and then to three gravelless chamber trenches. The distribution box must be accessible from grade and must have flow equalizers, or similar product, installed on each outlet pipe in the distribution box to assure equalflow to each trench. Each trench will consist of 12 'Quick 4' Standard Plus lnfiltrator@ chambers for a total of 36 chambers and 432 square feet of infiltrative area. There must be at least 4-feet of undisturbed soil between each trench. lnspection ports must be installed at the beginning and end of each trench. Ports may be cut to grade and placed in sprinkler boxes for access. COMPONENT SPECIFICATIONS The component manufacturers are typical of applications used by contractors and engineers in this area. CBO lnc. must approve alternative components prior to installation of the OWTS. Requests must be submitted, in writing, to our office for approval prior to installation. Component technical data sheets are available upon request. OWTS Gomponent Minimum Elevation Primary Tank lnlet lnvert Approximate horizontal distance 40' / min. 2% fall I min. 10" fall Distribution Box Approximate horizontal distance 15' / min. 1% fall I min. 1.875" fall Infiltrative Surface Approximate horizontal distance to furthest trench 26' I min.1%fall / min. 3.25" fall COMPONENT MANUFACTURER MODEL NO.COMMENTS Septic Tank Valley Precast or lnfiltrator@ Item # 1000T-2CP or Item # 1060-2CP 1000-gallon,2- :ompartment septic tank Risers and Lids Orenco@ Double-walled PVC risers and lids Effluent Filter Orenco@ 4-inch diameter Fullsize Distribution Box Polylok Distribution box, lids, 'ises, and (4) flow -.qualizers Chambers lnfiltrator@ Standard Plus 36 'Quick 4' Page 5 Construction must be according to Garfield County On-Site Wastewater Treatment System Regulations, the OWTS Permit provided by Garfield County Building Department, and this design. COMPONENT SPECIFICATIONS The component manufacturers are typical of applications used by contractors and engineers in this area. GBO Inc. must approve alternative components prior to installation of the OWTS. Requests must be submitted, in writing, to our office for approval prior to installation. Component technical data sheets are available upon request. Construction must be according to Garfield County On-Site Wastewater Treatment System Regulations, the OWTS Permit provided by Garfield County Building Department, and this design. I NSTALLATION CONTRACTOR CBO lnc. expects that the installer be experienced and qualified to perform the scope of work outlined in this design. The installer must review this design thoroughly and coordinate with our office in advance of installation. Any additional conditions in this design or county permit must be completed and documented prior to final approval of the OWTS installation. Communication between the installer and this office is expected throughout the installation. INSTALLATION OBSERVATIONS CBO lnc. must view the OWTS during construction. The OWTS observation should be performed before backfill, after placement of OWTS components. Septic tanks, distribution devices, pumps, dosing siphons, and other plumbing, as applicable, must also be observed. CBO lnc. should be notified 48 hours in advance to observe the installation. COMPONENT MANUFACTURER MODEL NO.COMMENTS Septic Tank Valley Precast Item # 1500T-2CP-HH 2-compartment concrete septic tank with high read oump Pump Orenco@ PF300511%HP 120 Volt Biotuþe ProPaK Pump Packaoe Orenco@ BPP30DD Vault, Filter, Control Panel (demand dose) Tank Risers and Lids Orenco@ Douþle-walled PVC R¡sers and Lids (24" diameter) ADV Orenco(Ð v64024 1.5" lnlet and Outlets ADV Riser and Lid Orenco(Ð Double-walled PVC Risers and Lids (30" diameter) Orifice Shields OrencoG)OS150 1 .5 inch diameter (16 total) l-lushlng Assemþly Orenco@ 1.5" diameter (2) 45" or 90" long sweep only lB total) Chambers lnf¡ltrator(Ð 'Quick 4' Low Prof¡le Page 6 ln an effort to improve the accuracy of the record drawing, we request that the installer provide a sketch of the installation, including path of the sewer lines, water line installation (if applicable), septic tank location, STA location, and measurements from building corners or another fixed objects on the property. This sketch is most easily provided on Sheet W2.0 of the OWTS Design Packet. Photographs of the installation and final cover are also requested to supplement our installation documentation. REVEGETATION REQUIREMENTS An adequate layer of good quality topsoil capable of supporting revegetation shall be placed over the entire disturbed area of the OWTS installation. A mixture of native grass seed that has good soil stabilizing characteristics (but without taproots), provides a maximum transpiration rate, and competes well with successional species. No trees or shrubs, or any vegetation requiring regular inigation shall be placed over the STA. Until vegetation is reestablished, erosion and sediment control measures shall be implemented and maintained on site. The owner of the OWTS shall be responsible for maintaining proper vegetation cover. OPERATION INFORMATION AND MAINTENANCE The property owner shall be responsible for the operation and maintenance of each OWTS servicing the property. The property owner is responsible for maintaining service contracts for manufactured units, alternating STAs, and any other components needing maintenance. Geo-fabrics or plastics should not be used over the STA. No heavy equipment, machinery, or materials should be placed on the backfilled STA. Machines with tracks (not wheels) should be used during construction of the STA for better weight distribution. Livestock should not graze on the STA. Plumbing fixtures should be checked to ensure that no additional water is being discharged to OWTS. For example, a running toilet or leaky faucet can discharge hundreds of gallons of water a day and harm a STA. lf an effluent filter or screen has been installed in the OWTS, we recommend this filter or screen be cleaned annually, or as needed. lf the OWTS consists of a pressurized pump system, we recommend the laterals be flushed annually, or as needed. The homeowner should pump the septic tank every two years, or as needed gauged by measurement of solids in the tank. Garbage disposal use should be minimized, and non-biodegradable materials should not be placed into the OWTS. Grease should not be placed in household drains. Loading from a water softener should not be discharged into the OWTS. No hazardous wastes should be directed into the OWTS. Mechanical room drains should not discharge into the OWTS. The OWTS is engineered for domestic waste only. ADDITIONAL CONSTRUCTION NOTES lf design includes a pump, weep holes must be installed to allow pump lines to drain to minimize risk of freezing. The pump shall have an audible and visual alarm notification in the event of excessively high- water conditions and shall be connected to a control breaker separate from the high-water alarm breaker and from any other control system circuits. The pump system shall have a switch so the pump can be manually operated. Excavation equipment must not drive in the excavation of the STA due to the potential to compact soil. Extensions should be placed on all septic tank components to allow access to them from existing grade. Backfill over the STA must be uniform and granular with no material greater than minus 3-inch. PageT LIMITS: The design is based on information submitted. lf soil conditions encountered are different from conditions described in report, CBO lnc. should be notified. All OWTS construction must be according to the county regulations. Requirements not specified in this report must follow applicable county regulations. The contractor should have documented and demonstrated knowledge of the requirements and regulations of the county in which they are working. Licensing of Systems Contractors may be required by county regulation. Please call with questions Sincerely, CBO ]nc. Cß'qbtstfung Carla Ostberg, MPH, REHS CBO lnc129 Cains LaneCarbondale, Colorado 81623Phone 970.309.5259carla.ostberg@gmail.com1RESIDENCE --ZAPPROXIMATE WELL,/ locmo¡.rHiatt Residence1884 CR 120Garf¡eld County, ColorâdoProjectNumber: C1739Datei 0911012022Des¡gned by: CBODrawn by: DDNSCALE: 'l = 50'=0"TP1TP3+./- +ItSEPTICTANKTP2STATHE LOCATION OF PROPOSED IMPROVEMENTS SHOWN ARENOT THE RESULT OF A PROPERÎY SURVEY. IHÊ LOCATIONSARE APPROXIMATE. fT S rHE HOMEOwIT¡ERS' DUTY TOENSURE ALL CONSTRUCTON AND IMPROVEMENT LOCATIONSARE ACCURATE. PROPERTY LINES AND SETBACK DISTANCESSHOULD SE CONFIRI\¡IED PRIOR TO EXCAVATION- SCALEDFOR PRINTING ON 11'X'I7 PAPER.DRAWNGS MUST BE USED INCONJUNCTION WITH DESIGNLEÏTER DATED O9I 1OI2O?2rl SlïE PLANw1.0Sheet 1 0F 4 CBO lnc.129 Cãins LanêCarbondale, Colorado 81 623Phone 970.309.5259cârla,ostberg@gmail.comN7&SCALE: 1" = 20'4'r'-M4" DIA SCH{O SEWER PIPE WITH CLEANOUTMIN 2% FALL TO TANKM--PVCLINE(MrN. 1% FALL TOrPl tw J+3MIN. SCH.4O REQUIREDUNDER DRIVEWAY1 OOO-GALLON, TWO-COMPARTMENT4" DIA SDR-35 INSPECTION PORT ATSEPÏIC TANKWITH EFFLUENT SCREENi BEG|NNING AND END oF EACH TRENCHDISTRIBUTION BOXWITH ACCESS AT GRADEt'QUICK4' CHAMBER TRENCHES.3 TRENCHES WITH 12 CHAMBERS PER TRENCH4" DIA SDR.35 SEWER LINE TO EACH TRENCH(MtN. 1olo SLOPE TO TRENCH)FOR A TOTAL OF 36 CHAMBERS ANÐ 432 SFI.,Hiatt Residence1884 CR 120Garfi eld County, ColoradoProjectNumbec C1739Oale: Ogl1OnO22Designed by: CBODrawn by: DDw2.0Sheet 2 0F 4 CBO lnc.129 Cains LaneCarbondale, Colorado 81 623Phone 970.309.5259carla.ostbèrg@gma¡l.com-INFILTMTOR/ tNoeurrGRAVELLESS'QUICK4'CHÀMBER (4'x3')DiA SDR.35 DISRIBUTIONLINE TO EACH TRENCH([¡tN. 10,6 SLOPE TO TRENCH)4" DIA SDR-35EFFLUEM PIPE FROMTANKDISTRIBUTION BOX WITHDIA SDR€sAT GRADEINSPECTIONPORIPLACED IN4',TOP PORT OFCHAMBER ENDPLATESLSOILIDlA SDRAS INSPECTIONEXCAVATIONPORT AT BEGINNING ANDEND OF EACH TRENCHsmtryCHAMBER (4'x3')/ICHAMBER TRENCH PLANLr,-"'-.ffi/À CHAMBER 'IRENCH SECNON\9r-rft18SMALL VALVE COVERBOXOR IRRIGATIONVIVE BOX AT GMEFINISHED GRADECÆ OR ftRilDEDBOX AND COVER BROUGHT TO GRADECLEANOUT ASSEI\,IBLY24"CONCRETFCOMPACT4'DIA SDR35 SEWER LINE(MIN 2% SLOPE TO TANK,MrN. 1% TO STA)FINSHEDGRADE8ASÉ TO SUPPORTBOXPIPE CUTTOFTUSE HOLE SAWTOCUT THRU TOP OFSCREENEDBAFFLE ORENDOR SAND FORBEDDING3'MtN.ANGLED PIPETO BE USÊDAT INLET8" MrN_/iINSPECTION PORT DETAIL\9'-A IRENCII OETAIL\3/-ñtæ/ã DISIR|BUÎON BoX DETAIL\g/r-rrEú12 CHAMEERS PERTRENCHttìa..:'iOUTLETSooooHiatt Residence1884 CR 120Garf¡eld County, ColoradoProject Number: C1739llaÉ: ogr1ot2o22loes¡sn"o ov, ceolDrawn by: DDw3.0Sheet 3 0F 4 CBO lnc.129 Cains LaneCarbondale, Colorado 81623Phone 970.309.5259carla.ostberg@gmail.comDESIGN2-BEDROOM RESIDENCE(75 GPD x 2 PERSONS/BEDRoOM x 2 BEDROOMS)WASTEWATER FLOW = 300 GPDSTA TO CISTERN50'114STA TO WELL100'188'STA TO HOUSE20'60'SEPTIC TANK TO CISTERN50'SEPTIC TANK TO WËLL50'206',HOUSE TO SEPTIC TANK5'OWTS COMPONENTS ANDPHYSICAL FEATURESMINIMUI\,I REQUIREDSETBACKAPPROXIMATE PROPOSEDSETBACKTANK:MIN. IOOO GALLONSUSE lOOO-GALLON, TWO4OMPARTMENT SEPTIC TANKSOIL TREATMENT AREA (STA):LONG TERM ACCÊPTANCE RATE (LTAR) = 0.6 GAU SFCALCULATED STA = CI/LTAR = 300 / 0.6 = 500 SFGRAVlry, TRENCHÊS = 500 SF X 1.0 = 500 SFCHAMBERS = 500 SF X 0.7 = 350 SF / 12 SF / CHAMBER = 30 CHAMBERSSIX GRAVELLESS CHAMBER TRENCHESMIN. 3 TRENCHES, EACH WITH 1O QUICK 4 INFILTRATOR CHAMBERSRECOMMEND 3 TRENCHES, EACH WITH 12 QUICK 4 INFILTRATORCHAMBERS (BASED ON 0.5 GAUSF LTAR)SOIL PROFILE TEST PIT NO. 1SOIL PROFILÊ TEST PIT NO. 2SOIL PROFILE TEST PfT NO- 30'l2467I10DARK BROWN LOAMY TOPSOILDARK BROWN LOAMY TOPSOILDARK BROWN LOAMY TOPSOILLIGHT BROWN SAND WITH A DARKBROWN LOAM MATRIXLIGHT BROWN SAND WITH A DARKBROWN LOAM MATRIXLIGHT BROWN SAND WITH A DARKBROWN LOAM MATRIXSLIP-ON PVCDO NOT GLUEINSULATEDTRACER WREFINISHED GRADENO GROUNDWATER OR BEDROCK ENCOUNTEREDDURING EXCAVATION4" DIASEWER LINELEGENDtS læmF;l sandTO TANKHOUSE^soLs LoG\,,_M/ÀCI-EAN OIJT DETAIL\9'-MHiatt Residence1884 CR 120Garfield County, ColoradoProject Number: C1739Date: 0911012022Des¡gned by: CBODrawn by: DDw4.0Sheet 4 0F 4 ----a:--'1]íÞetÌ-1é¿) w GDqPublic.net'" Garfield County, CO 0 2O19Total Actual Value Overuiew Legend I Parcels Roads Parcel/Account Numbers Highways - Límited Access - Highway ** Major Road -' LocalRoad -- Minor Road Other Road Ramp -* Ferry Pedestrian Way Owner Name í- l takesçnivers - County Boundary Line $1,980 Last2Sales Date Price 9/13/2027 $O rt/t9/202o $170,000 Account Number Parcel Number Acres Land SqFt Tax Area 2019 Milt Levy R03003ó 218778102029 36 0 005 67.1690 Physical Address Owner Address GLENWOODSPRINGS HIATT, J ENNIFER N & LALOGGIA, STEPHANIE 3SOOWYORKROAD STILLWATER OK74O75 81ó01 D ate cr e a te d: 9 / IO / 2022 Lâst Dâta Uploaded: 9/10/2022 2:Q6:44 AM Deve rooed bv(Lì 9sþ¿tBi,4çr 9110122,10:38 AMSummaryAccountParcelPropertyAddrssLegalDscript¡onAcresLånd SqFtTaxAreaMillLevySuHiv¡sionÐqPuHb.net* Garfield County, COR03003ó2787L81O2029,GLENWOODSPRINGS,CO 81ó01Section: lSTownship: ó Range:88 Subdivision: LOOKOUT MTN- RANCHES RANCH 29 3ó.02ACRES36.O20567.7690LOOKOUT MTN. RANCHESqPublic.net - Garfield County, CO - Property Record Card: R0300362022$1,980.00$1,980.002022$52o.oo$o.oo$52o.oo2021"2020$38-28$34.s2Reception Number9642t2946153View MapOwnerHIATT, JENNIFER N & LALOGGIA, STEPHANIE3SOOWYORKROADSTILLWATER OK 7ZTO75LandUn¡tTyp€ GRAZING LAND-AGRICULTURAL - 4147 (AGRICULTURAL PROPERTY)Square Feet 0ActualValuesAssesed YearLand ActuâlTotal ActualAssessed ValuesAssessedYearLand Assessedlmprovement AssessedTotalAssessdTax HistoryTaxYeârTaxes BilfedClick here to view the tax informât¡on for th¡s oarcel on the GarÉeld County Treasurer's website.TransfersSaleDate DeedTypeelt3!2o?!*rrl!9/2020SPECIALWARRANW DEEDPERSONAL REP DEEDlmprovementActual $0.002021$1,980.00$0.00$1.980.00202L$570.00$o.oo$57o.oo2019$s4.842020$1e00.00$o.oo$1,9(X).(x)2020$550.00$o.oo$5s0.002018$33.44Sale Prke$o$170,000sÀtzdzoLETÏERS946752https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&KeyValue=R030036Book - Page$o1t2