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Home My WebLink AboutOWTS DesignI29 CAINS LANE CARBoNDALE,CO 41623 970.309.5259 CARLA. OSTBERG@G MAI L.COM Étlll"l' I (-: (-r() ñ* Sit t ! f .'l'l S¡(i April27,2022 Project No. C1716 Whit Whitaker wrw3@hotmail.com Subsurface lnvestigation and Onsite Wastewater Treatment System Design 5-Bedroom Residence 11454 CR 1 15 Garfield County, Colorado whit, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 4O-acre property is located outside of Glenwood Springs, in an area where OWTSs and wells are necessary. Legal Description: Section: 6 Township: 7 Range: 87 A TRACK lN THE SESE. 40 ACRES Parcel lD: 2391-064-00-146 SITE CONDITIONS The property is currently undeveloped. A 5-bedroom residence is proposed The residence will be served potable water from a well on the property. The well is located greater than S0-feet from the proposed septic tank and greater than 1OO-feet from the proposed soil treatment area (STA) No water line will come within 2S-feet of any OWTS component. The proposed soil treatment area (STA) location has an approximate eight percent slope to the southwest. The area is vegetated with 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 April 18,2022 by digging two 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 tan to medium brown silty clay loam to a maximum depth explored of 8.O-feet. No bedrock or groundwater was encountered. The materials encountered in Test Pit #2 consisted of medium brown topsoil to 1B-inches, underlain by tan to medium brown silty clay loam to a maximum depth explored of 8.O-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 Training. Page2 A sample of the soil was taken from Test Pit #1 at 3-feet below grade. Soil structure grade was moderate. The soilformed a ball and a ribbon 1 to 2-inches in length before breaking. Soil structure shape was blocky and consistence was firm to extremely firm. Soil texture was more smooth than gritty STA sizing is based on SoilType 3, Silty Clay Loam with moderate structure grade. A long term acceptance rate (LTAR) of 0.35 gallons per square foot will be used to design the OWTS" View of Test Pit #1 Moderate structure grade Backfill/ blocky shaped peds Sieved sample Ribbon between 1 and 2-inches Page 3 Test Pit #2 Backfill View of Test Pits looking from south Test Pit #2 DESIGN SPECIF¡CATIONS Desiqn Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 150 GPD (4th and 5th Bedrooms) = 600 GPD LTAR = 0.35 GPD/SF 600 GPD / 0.35 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 1200 SF The OWTS design is based on 5-bedrooms. An average daily wastewater flow of 600 GPD will be used For the purposes of this OWTS design, Benchmark Elevation at grade 7222' has been established as Finished Floor of the residence (100'). The sewer line will exit the foundation at approxim alely 7218' . CBO lnc. should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. Page 4 *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 SDR-35 sewer line exiting the residence must have a double-sweep clean out and a minimum 2o/o grade to the septic tank. The system installation must include a 1500-9allon, two-compartment lnfiltrator@ poly septic tank with an effluent filter on the outlet tee. Other state-approved concrete or poly septic tanks may be substituted. 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 distribution box, and then to six 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 equal flow to each bed. Each trench will consist of 17 'Quick 4' Standard Plus lnfiltrator@ chambers for a total of 102 chambers and 1224 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. GBO 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 u 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. OWTS Gomponent Minimum Elevation Primary Tank lnlet lnvert Approximate horizontal distance 30' / min. 2% îall to septic tank / min. 7.5" lall Distribution Box Approximate horizontal distance 26' I min. 1% fall I min.3.25'fall lnfiltrative Surface Approximate horizontal distance 50' / min. 1% fall I min.6.25" fall COMPONENT MANUFACTURER MODEL NO COMMENTS Septic Tank Valley Precast or lnfiltrator@ tem # 1500T-2CP or tem # lM-1530-2CP 1 500-9allon, 2-compartment septic tank Risers and Lids Orenco@ Double-walled PVC risers and lids Effluent Filter Orenco@ 4-inch diameter Full size Distribution Box Polylok Distribution box, lids, rises, and (6) flow equalizers Chambers lnfiltrator@ Standard Plus 102 'Quick 4' Page 5 INSTALLATION 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. 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 irrigation 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 MA¡NTENANCE 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. Page 6 Mechanical room drains should not d¡scharge 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. 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 lnc. tøntæ tYtúxxg Carla Ostberg, MPH, REHS MUST BElû1rTHCBO lnc-129 Cains LaneCarbondale, ColoEdo 81623Phone 970.309.5259ærla.ostberg@gma¡1.æmAuto \Court iWhitaker Residence1 1454 CR I 15Garfield County, ColoradoProject Number: C1716Oale: 0U27n022Designed by: CBODrawn by: DDw1 .0Sheet I 0F 4.l)II¿' CBO lnc.129 Cains LaneCarbondale, Colorado 81623Phone 970.309.5259carla.ostberg@gmail.com5-BEOROOMRESIDENCEFF 7222' (BM 100',)AutoCourtoWhitaker Residence11454 CR fl5Garf¡eld County, ColoradoProjectNumben C1716Dale: 0412712022Designed by: CBODrawn by: DDSheet 2 0F 4w2.0NA-\r--rffii-ñll1$gûiÅÀl I - --SCALE: l'= 30L0"'"'\,LINE To Exrr Fouruomoñ nppa ox. 721a,," PROPERTYDIA SDR-35 SEWER PIPE WITH CLeAr.lOUt --"" ,-MIN 2% FALL TO TANK\''r.TWO-COMPARTMENT POLYSEPTIC TANK WITH EFFLUENT SCREEN'tt -.4' DIA SDR-35 SEWER PIPEMIN I% FALLTO D-BOXìjìjìjiIillììì'i-DISTRIBUTION BOXWITH ACCESS AT GRADE,/¿" orÂ son-ss seweR LINE, EACH TRENCHIìJilTP1+,/ (utN. 1% sLoPE TO TRENCH)a'8<-(,J+-/(x(-IIlI4" DIA SDR.35 INSPECTION PORT AT/ BEGTNNTNGAND END OF EACH TRENCH/ /' ,,/Ô rpz-'QUICK4' CHAMBER TRENCHES.6 TRENCHES WITH 17 CHAMBERS PER TRENCHFOR A TOTAL OF 102 CHAMBERS AND1224 SF./IJII- .s7øe/- ._*/i,i/a'pRopòsEo owrs 1't-Ll'! CBO lnc.129 Cains LaneCarbondale, Colorado 81623Phone 970.309.5259carla.ostberg@gmail.comTRATOR4' DIA SDR35 SÊWERLINE TO EACH IRENCH(MrN. 1% SLOPE TOTRÊNCH)GRAVELLESS 'QUICK4'CHAMBÊR (4'x 3')4' OtA SOR-35EFFLUENT PIPE FROMSEPTIC TANKEND PLATE- DISTRIBUTION BOX WTH,/ nccess nr onnoe- PIPES TO sTH AND 6TH/ TRENCHESD¡A SDR-35PUCED ININSPECTIONPORT4'TOP PORT OFCHA¡.¡I8ER ENDPLATES4'LsotLDIA SDR.35 INSPECTION_.1PORTAT BEGINNING ANOEND OF EACH TRENCHLIMITEXCAVATIONGRAVELLESS 'QUICK4'SCÆIryCHAMBER (4'x 3')/ñCHAMBER IRENCH SECTON\rr-ffied/ISIA PLAN VIEW\!¡-""-ffiSMALL VALVE COVERAOX OR IRRIGATIONVALVE BOX AT GRADEFINISHED GRADECAP OR IHREAOEDBOX AND COVER SROUGHT TO GRADECONCRETE LID----1\CLEANOUT ASSEMBLY24'COMPACT4'DIA SDR-35 SEWERffiêtr'E-DcRAóË-BASE TO SUPPORTBOXPVC PIPE CUT TO(MrN 2% SLOPE TO TANK,MrN. 1ôlo TO STA)FITUSÊ HOLE SAWTOCUT THRU IOP OFSCREENÊÞOR SAND FORBEDDING3" MtN.8'MrN.BAFFLE ORANGLED PIPEADISIRIBUTION BOXTO BE USEDAT INLEI/ITRENCH DETAIL\3r-nıffi/.\ DISTRIBUTION BOX DETAIL\9r-ãaræ17 CHAMBÊRS PER TRENCH-¿BACKFILLOUTLETSIooooWhitaker Residence'f 1454 CR I 15Garfield County, ColoradoProjectNumber: C1716l)"øt o+nznozzlo"s¡gneo uv: ceolDrawn bv: DDw3.0Sheet 3 0F 4 CBO lnc.'129 Cains LaneCarbondale, Colorado 81623Phone 970.309.5259carla.ostberg@gmail.comDESIGN5.BEDROOM RESIDENCE75 GPD x 2 PERSONS/BEDROOM x 3 BEDROOMS + 150 GPD (4th and sthBEDROOMS)WASTEWATER FLOW = 600 GPDTANK:MIN. 15OO GALLONSUSÊ 1sOO-GALLON, TWO.COMPARTMENT POLY SEPTIC IANKSTA TO WATER COURSE50'N/ASTA IO WELL100'258'STA TO HOUSE20'70'SEPTIC TANK TO WATER COURSE50'N/ASEPTIC TANK TO WÊLL50'211',HOUSE TO SÉPTIC TANK22'OWTS COI\¡PONENTS ANDPHYSICAL FEATURESMINIMUM REOUIREDSETBACKAPPROXIMATE PROPOSEDSETBACKSOIL TREATMENT AREA (STA):LONG TERM ACCEPTANCE RATE (LTAR) = 0.35 GAU SFCALCULATED STA = C/LTAR = 600 / 0.35 = 1714 SFGRAVlw, TRENCHES = 1714 SF X 1.0 = 1714 SFCHAMBERS = '1714 SF X 0.7 = 1200 sF /'12 SF / CHAMBER = 100 CHAMBERSSIX GRAVELLESS CHAMBER TRENCHES17 'QUICK 4' CHAMBERS IN EACH TRENCHTOTAL 102'QUICK 4' CHAMBERSSOIL PROFILE TEST PIT NO. 1SOIL PROFILE TEST PIT NO. 2-0-12-3-4-þMEDIUM BROWN TOPSOILFUUI-FcUoTAN TO MEDIUM BROWN SILry CLAYLOAMTAN TO MEDIUM BROWN SILTY CLAYLOAMSLIP-ON PVCDO NOT GLUE6INSUI"ATEDTRACERWIREFINISHED GRADE-7-8rt-10LEGENDF topso¡lns¡lty clayloam4'OtASEWER LINENO GROUNDWATER OR BEDROCK ENCOUNTEREDDURING EXCAVATIONTO TANKHOUSE¡^ SOILS LOG\rl-nı-rñæACLEAN OUT DETAIL\rl-ìı'æWhitaker Residence1 1454 CR 1 l5Garfield County, ColoradoProjectNumber: C1716l}^r", oqrztnozzloes¡gneo ¡v, ceolDrawn bv: DDw4.0Sheet 4 0F 4 tÐqPgblic.net " Garfield County, CO Dev e rone d bv f ì !,.å.f,A'd *f Overview Legend {3 earcels Roads Parcel/Account Numbers Highways : Limited Access - Highway ' Major Road ' Local Road . Minor Road Other Road Ramp "" Ferry Pedestrian Way Owner Name ' Lakes & Rivers * County Boundary Line $2,200 Last2Sales Date Price 9/70/2020 $O 9/to/2020 $o Account R111520 Physical O 20l9TotalActual Number Address Value ParcelNumber 239106400146 CARBONDALE 81623 Acres 40 Owner Address WHITAKER,WALTER R lll& SOPHIE LandSqFt 0 R TaxArea 011 IOO9CATTLECREEKR|DGE ROAD 2019Mill Levy 79.7760 CARBONDALECO81623 D a te cr e ate d: 4 / 28 / 2022 Last Data Uploaded: 4/28/2022 2:73:49 AM 4128122, 1:42PM Summary Account Parcel Property Address Legal Description Acres Land SqFt Tax Area MillLevy Subdivision Yjpsl4aa Owner Land Unit Type Square Feet Actual Values Assessed Year Land Actual lmprovement Actual Total Actual Assessed Values Assessed Year Land Assessed lmprovement Assessed Total Assessed Tax History Tax Year Taxes Billed R111520 239706400L46 ,CARBONDALE,CO 81ó23 Section: ó Township: 7 Range:87 ATRACK lN THE SESE.40 ACRES 40 0 T7 79.7760 æry*e-- qPublic.net - Garfield County, CO - Property Record Card: R111520 *lqPublic,net"' Garfi eld County, CO WH|IÁKER,WArr_R R tìt6¡SOPHlË R 1OO9 CATTLE CREEK RIDGE ROAÞ CARBONDALE CO 81ó23 GRAZING tAND-AGRICULTURAL. 4147 (AGRICULTURAL PROPERTY) 0 20.27 $s1.04 2020 $4ó.08 2079 $46.48 2027 $2,200.00 $0.00 $2,200.00 2027 $ó40.00 $o.oo $ó40.00 20r8 $44.60 2020 $2,110.O0 $o.oo $2,110.00 2020 $ó10.00 $0.00 $610.00 20L7 $42.64 Cl¡qk bsrre !a vie\¡f thelax ¡nfa!:ryìat¡on fgr thii pârcel on the Garfeld Couniv.Trgålu{ef's wehsite. Transfers Sale Date 9/ro/2020 9/,70/2020 2/19/zozlo 9/9/2020 9/9/2020 6/24/2077 6/22/2017 9/4/2002 el4/2o9? 9/4/2002 el4/2oo2 4/79/2002 Reception Number eqeJ46 ?48265 74?s5_6 ?4169g 9416ç7 8Qç,q5 90430é t L0740 6L4242 619238 6.r?#L ô92?5? Book - PageDeed Type Right Of Way Easement Right Of Way Easement R¡ght Of Way Easement SPECIALWARRANTY DEED STATEMENT OF AUTHORITY WARRANTY DEED STATEMENT OF AUTHORITY QUITCLAIM DEED QUIT,C-LAIM DEED - Q,!/lrcLArM DEE_D WARRANTYDEED AGREEMENT 1384-170 1384-108 1384-10ó 7384-702 1350-59s Sale Price $o $o $o $s2s,000 $o $475,000 .$o $o $o $o $33s,000 https:/iqpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=566230598&KeyValue=R111520 112 4/28122, 1:42PM 4/ro/2002 qPublic.net - Garfield County, CO - Property Record Card: R111520 tt/77/r994 9t3/7993 2t28/rg90 .3/.76/1989 7/22/7984 4/t6/1984 u3t/1983 -11?1/!e93 70/25/.t977 9/6/1977 __4-G,BEF\1ENl WARRANTYDEED COURTDECREE RESOLUTION DEED RESOLUTION 6A?35á. 471-158 45?!74 41Q3çq 4W2? q15277 . 351445 wgl 3ile7q ?81482 284637 1350-598 0923-OO23 o874-O785 0773-0822 0752-0-369 oó55-O987 0647-O?93. 0679-050-4 0679-0467 $o'- $1s8,000 $8o,oooWARRANTYDEED SPECIAL WARRANTY DEED QUITCLAIM DEED $2,o5o,ooo QUITCLAIM DEED WARRANryDEED o502-0275 0500-0ó54 $o $o $o $o $o $o $o Property Related Public Documents Click here to view Pronertv Related Public Docurnents Photos No data âva¡lable for the following modules: Buildings, Sketches. t:a*rxlt be g**r ;:r'i?.ee;':, Y;çr.l*gqt-?-çticv- -G9P*ßEtABçr-Y-is; LÆt.pstay_dBd;.A/_Zp-t29JJ'X.2,;ß;9j'M vr:r::,i;::¡?-.:t'.'t.ji l;t:::t::it¿tt:by f)Fpj'r.,,,9çr https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=566230598&KeyValue=R111520 212