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Home My WebLink AboutOWTS DesignRECEIVED I29 CAINS LANE Cnneor\onlE, CO A1623 970.309.5259 ÇARLA. ÕgTBERG@qMAIL. ç QM GARFIELD COUNTY TOMMUNITY DEVELOPMENT L'il¿;Ì"rl(: (:()F¡Þ4t rr."trI¡i(i September 7,2021 Project No. C1653 Victoria Stulgis Vi cto ria. stu I g i s(Ogmallçgm Subsurface lnvestigation and Onsite Wastewater Treatment System Design 4-Bedroom Main House and Barn/1-Bedroom ADU TBD Harmony Lane Garfield County, Colorado Victoria, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 12.63-acre property is located outside of Carbondale, in an area where OWTSs and wells are necessary. Legal Description: Section: 28 Township: 7 Range: 87 A TR lN SENW;AKA JOSEPH'S MEADOW SUBDIVISION EXEPTION, LOT 3 PER REC #453697.12.63 ACRES Parcel lD: 2391 -282-00-1 98 SITE CONDITIONS The property is currently undeveloped. A 4-bedroom, single-family residence (Main House) and Barn and 1-bedroom Accessory Dwelling Unit (ADU) are proposed. Potable water to each structure will be provided by a well, located along the northern property boundary in the eastern portion of the property. The well is located at least SO-feet from the proposed septic tanks and at least 1OO-feet from the proposed soil treatment area (STA). There is a stormwater runoff detention pond proposed near the southern property boundary, to the west of the Barn. The stormwater runoff detention pond must be at least 2S-feet from the proposed STA. The proposed STA location has an approximate 6-7% slope to the south. The proposed area is vegetated with native grasses and sage. 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. Page2 SUBSURFACE The subsurface was investigated on August 26,2021 by digging two soil profile test pit excavations (Iest 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 medium brown topsoil to 2.0-feet, underlain by dense, light brown to tan calcareous clay matrix to a maximum depth explored of 6.0-feet. No bedrock or groundwater was encountered. The materials encountered in Test Pit #2 consisted of medium brown topsoil to 1.O-foot, underlain by dense, light brown to tan calcareous clay matrix to a maximum depth explored of 4.O-feet where practical digging refusal was encountered. No bedrock or groundwater was encountered. A sample of the soils was taken from Test Pit #1 at 3-feet below grade. Soil structure grade was dense (weak). The soil formed a ball and a ribbon less than 1-inch in length before breaking. Soil structure shape was blocky and consistence was rigid. Soil texture was more gritty than smooth. STA sizing is based on Soil Type2A. A long term acceptance rate (LTAR) of 0.5 gallons per square foot will be used to design the OWTS. Test Pit #1 1 Garla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 3 Sidewall is dense (weak) Sieved sample ribbon less than l-inch Page 4 Test Pit #2backfíll Machine 314-3 sidewall of Test Pit #2 Page 5 DESIGN SPEGIFICATIONS Desiqn Calculations: AverageDesignFlow=T5GPDx2people/bedroomx3Bedrooms+75GPO1+rHbedroom)=525GPD+ 150 GPD (1-bedroom ADU) = 675 GPD LTAR = 0.5 GPD/SF 675 GPD / 0.5 GPD/SF x 1.0 (gravity trenches) x 0.7 (GeoMatrM with 6" sand) = 945 SF The new OWTS design is based on a 4-bedroom Main House and a l-bedroom ADU above a Barn. Plumbing in the Barn will be an auxiliary use to the Main House and ADU. An average daily wastewater flow of 675 GPD will be used. For the purposes of this OWTS design, Benchmark Elevation at grade 7103' (Finished Floor of the Main House) has been established as 100'. Finished Floor of the Barn at 7081' must also be considered. CBO lnc. should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. *Elevations are installation due based upon standard OWTS installation practices. Component elevations may change during to site conditions. The 4-inch diameter SDR-35 sewer line exiting the Main House must have double-sweep clean out and a minimum 2% grade to the septic tank. The system installation must include a 12S0-gallon, two- compartment septic tank (either 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. The sewer line must have a clean out at least every 1OO-feet. The 4-inch diameter Schedule 40 sewer line exiting the Barn/ADU must have double-sweep clean out and a minimum 2o/o grade to the septic tank. This sewer line runs under a driveway and should be well bedded and covered with blue board for protection from compaction and freezing. The sewer line must have a clean out at least every 1OO-feet. The 4-inch sewer line from the Main House septic tank will tie into the sewer line from the Barn/ADU sewer line with a "vvye" fitting. The system installation must include a 1000-gallon, two-compartment septic tank (either 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 distribution box, and then to five GeoMatrM 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. OWTS Gomponent Minimum Elevation Primary Tank lnlet lnvert (Main House)Approx. horizontal distance 30' / min. Íall2o/o I min. 7.5" fall Primary Tank lnlet lnvert (Barn)Approx. horizontal distance 113' I min. fall 2o/o I min.28.25" fall Distribution Box Approx. horizontal distance 43'l min fall lo/o / min. 5.375" fall lnfiltrative Surface Approx. horizontal distance to furthest trench 45' / min. 1% fall/ min. 5.625" fall Page 6 Each trench will be 36-inches wide with a minimum of 6-inches of sand filter material placed in the trench Sand filter material must be clean, coar:se sand, all passing a screen having four meshes to the inch. The sand must have an effective size between 0.15 and 0.60 mm. The uniformity coefficient must be 7.0 or less. Material meeting ASTM 33, for concrete sand, with three percent or less fines passing 200 mesh sieve may be used. A gradation of the sand media must be submitted to this office prior to obtaining the sand. 39-inch wide GeoMatrM will be placed on top of the sand filter material the entire length of the trench. The GeoMatrM is 39-inches wide and may curl up the sides of the trenches slightly. A 4-inch diameter perforated pipe will be placed down the center of the GeoMatrM, under the top layer of fabric. The STA will consist of 5 trenches, each with 63 linear feet of 39-inch wide GeoMatrM for a total of 315 linear feet and 945 sqaure feet. All material associated with the GeoMatrM installation must be proprietary products associated with the GeoMatrM, including the geotextile fabric. Manufacturer instructions must be followed regarding installation of the GeoMatrM. 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. The front inspection port will be placed to the side of the GeoMatrM and the end inspection port will be tied onto the end of the lateral. Ports may be cut to grade and placed in sprinkler boxes for access. There shall be no cobble-sized (<2.5") or greater rock in final cover over the GeoMatrM. COMPONENT SPECIF¡CATIONS 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 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. 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. COMPONENT MANUFACTURER MODEL NO.COMMENTS sepüc lanl(valley Precast Item #1250T-2CP 1 250-9allon, two-compartment :oncrete septic tank Septic Tank valley Precast Item # 1000t-zGP I 250-gallon, two-compartment :oncrete septic tank Biotube Effluent Filter Orenco@ ,2) Full Size Effluent Filters and l0usrnqs Dlstrlþution Box PolyLok )istribution box, risers, lid, and 1ow eoualizers 14) GeoMatrM GeoMatrix Systems, LLC 115,GeoMalru 139,, wide ¡heets) Page 7 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 hourã 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 anothei fixed gbiects on the propefi. 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 instãllation 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 ðompetes well witñ successional species. No trees or shrubs, or any vegetation requiring regular inigation shall be placed over the STA. Until vegetation is reestiablished, 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 theproperty. The property owner is responsible for maintaining service contracts for manufactured units, altemating 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, ã 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 breãker and from any other control system circuits. The pump system shall have a switch so the pump can be manually operated. Page 8 Excavation equipment must not drive in 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. Ce;"{a-üxtúxxg Carla Ostberg, MPH, REHS CBO Inc.'129 Cains LâneCarbondale, Cdo€do I l 623Phone 970.309.5259ærla.ostberg@gmail.æmUN-----lvz.0\--_---\\-ooôlliloq)-sqrsÉq -oC+ooooTP 1-@EF-_-----\R\.--__-^_Q----------'-q=-1P2q-4-BEDROOMRESIDENCE@l-------r-\,Ø'Ir'Stulgis ResidenceTBD Harmony LaneGarfi eld County, ColomdoProjectNumben C1653Dale: 0910712021Designed by: CBODram by: DDw1.0Sheet I 0F 4oooCooRUNOFFDETENTIONoS/â SITE PLAN\l---rÉ-?DRAWINGS MUST BE USED INCONJUNCT¡ON WITH DESIGNLETTER DATED O9iO7l202I+1-\-f,-\\\tt-ADUï-q\@ÌIHE LOCATION OF PROPOSED IMPROVEMENTS SHOWN ARE\ NOTTHE RESULT OF A PROPERW SURVEY. THE LOCAIIONSARE APPROXIMATE. IT IS lHE HOMEOWNERS' DUTY TOENSURE ALL CONSTRUCTION AND IMPROVEMENT LOCATIONSARE ACCURATE. PROPERTY LINES AND SETBACK DISTANCESSHOULD BE CONFIRMED PRIORTO EXCAVATION. SCALEDFOR PRINTING ON 11'X 1T PAPER..-øEl7--q-....-@ CBO lnc-129 Cains LaæCarbondale, Cdffi do 8l 623Phone 970.309-5259ærla.ostberg@gmail.æmMPROPOSED4.BEDROOMRESIDENCEFF 71+ì30to be determined by civil EnginU VCTI\A(s-là7Stulgis ResidenceTBD Harmony LaneGarfield County, ColoradoPrcjeci Number: C'1653BARN +.I-BEDROOMADU7081'-¿'(oNE EVERY 100)(oNE EVERY 100)MIN 2% FALL TO TANK.- 4' DIA sCH-40 SEWER PIPE wlTH"aDate: 09l|7l2ï2'lDesigned by: CBODmmby: DDSheet 2 0F 4w2.0SÉ$$LçÉT|Zo9I,-t4' DIA SDR.35 SEWER PIPE WTHMIN 2% FALL TO TANK1 2sO.GALLON, TWO-COMPARTMENTSEPTIC TANKwlTH EFFLUENT SCREENNlzO8& _--.4"DtAsDR-3ssEWERptpE(MtN 1%- \.-__ .\:-æry @-SCALE:1"= 30{'1 OOO-GALLON, TWO.COMPARTMENTSEPTIC TANK WTH EFFLUENT SCREEN@.=.-DISTRIBUTION BOX@--__ ¿-- w:ï AccESS AT GRADE4' DIA SDR.35 INSPECTION PORT ATEND OF EACH LATERALTPI+%-5 TRENCHES,39"GEOMAT¿ùd+rP24'DIA SDR-35 PVC SEWER LINE(MrN. r% FALL TO D-BOX)\GEOMAT il FABRIC OVER4" PERFORATED PIPELATERALf- _ -- 4' DIA PERFR,ATED PIPE LATERALON TOP OF GEOMATilDIA SDR-35 SEWER LINE TO. EACH BED(MtN. 1% SLOPE TOTRENCH)GEOMAT (39) WTH 6" OF SAND ON BASE. DEPTH OFTRENCHES TO REMAIN SHALLOW, APPROXIMATELY 2'BELOW GRADE.LINE4" DIA SDR.35 INSPECTION PORT ATFRONT OF EACH TRENCHStomwoerunoênron CBO lnc.129 Ca¡ns LaneCarbondale, ColoEdo 81 623Phone 970.309.5259caria.oslberg@ma¡l.comStulgis ResidenceTBD Harmony LaneGarfi eld County, ColoradoProjectNumben C165309107t2021by: DDby: CBOSheet 3 0F 4w3.0DIA SDR-35 SEWER LINE FROM TANKDISTRIBUTION BOXWTH ÀCCESS AT GRADEBOX AND COVER BROUGHT TO GRADEcoNcRmiiGfiEıã6Ë-4' DIA SDR-35 PVCTO EACH BEDBAFFLE ORANGLED PIPETO BE USEDINSPECTION PORTATBEGINNING OF EACH TRENCHAT INLETrãDlSlRlBU'llON BOX DETAIL\9-æPIPE TO sTHTRËNCHVALVEDIA SDR-35 INSPECTIONSLIP.ON PVCBOX AT GRADEPORT AT END OF EACHLATERALDO NOI GLUEGMEINSPECTION PIPE4' DIA PERFRATED PIPE L.ATERALPLACED oN Top oF GEoMAT ilâ\GEOT¡AT TRENCH PLAN\rr-æ5 TRENCHES, EACH WITH 6"1/4'DIA HOLE DRILLEDINTO TWO SIDES OF PIPEFORVENTILATION(BELOW SL|P ON CAP)SAND UNDER 39- wlDEGEoMAT ilMEDIA/;\ INS?EC'ÍION PORÎ DETAILlc/--EF¡nished cEde4" DIA PERFORATED LATERALON GEOMATSEPARATION FABRIC12 Min¡mum CwsrINSPECTION PORT AT BEGINNINGOF EACH TRENCHGRADE4' Dist¡ibut¡on PipeI' TOPSOILCOVER.SE@MÆYSdEFFECM SE ¡ 0,15 - 0.ß muNtFoilñ GFFCTEMIU.o% FINES PÆINGøSIæ-<¡NOTE:ONE 39"WDE GEOMATSHEETPLACED ON 6'' OF SAND IN 3'WDETRENCHHygtMp¡c¡/-ì GEoMAT SEC'[|ON\9----E.t@,.ãSTA SEC'ÍION\t--_EOUTLETSoooo CBO lnc.129 Cains LaneCarbondale, ColoEdo 8l 6æPhmê 970.309.5259€da.ctberg@gmail.æmStulgis ResidenceTBD Harmony LaneGarfi eld County, ColoradoProject Number: C1653Date: o9107t202'lDæigned by: CBODrawn by: DDw4.0Sheet 4 0F 4lnspectionDESIGN4€EDROOT RESIDENCE + I.BEDROOT ADU ovER BARN75 GPD x 2 PERSONS/BEDROOM x 3 BÊDROOMS + 7s cpD (4TH BEDROOM) = S2S GpD +150 GPD (ADU) = 67s GPDWASTEWATER FLOW = 675 cPDTANK:MAIN HOUSE : USE '1250-GALLON, TWO-COMPARTMENT CONCRETE SËpTtC TANKBARN/ADU: USE 1000-GALLON, TWO€OMPARTMENT CONCRETE SEpTtC TANKSOIL TREATMENT AREA (STA):LONG TER¡¡ ACCEPTANCE RATE (LTAR) = 0.5 cAU SFCALCUTATED STA = CyLTAR = 675 / 0.5 = 1350 SFGRAVlw, TRENCHES = 1350 SF X 1.0 = 1350 SFGEOMAT = 1350 SF X 0.7 = 945 SF / 3 FT W|DE / TRENCH = 31S LTNEAR FEET OF TRENCHFIVE TRENCHES, EACH 3' X 63'Fabric (Hyg@p¡cD¡stibut¡cnP¡p€GæMat6'SANDsNDFILERMEruSECONMRY WYEFECTIW Slæ = 0.15 - 0.6 mmUN¡rcUIW COÊFFICIEM <7.0% FtNEs PÆstNG ffi stEVE_<-oSOIL PROFILE TEST PIT NO. 1SOIL PROFILE TEST PIT NO. 20123456MEDIUM BROWN TOPSOILLMEDIUM BROWN TOPSOLDENSE, LIGHT BROWN TO TANCALCAREOUS CLAY MATRIXFUUL-ÞduôDENSE, LIGHT BROWN TO TANCALCAREOUS CLAY MATRIXÞIGGING REFUSALDIFFICULT DIGGING-7-8-10NO GROUNDWATER OR BEDROCK ENCOUNTEREDDURING EXCAVATIONLEGENDFl topsilFl €la@usl' :l clay mtrir/i SOILS LOGvrr-.'......._nræSTA TO WATER COURSE50'N/ASTATO WELL100'569'169'/ 181'STA TO HOUSE2gSEPTIC TANKTO WATER COURSE50'N/ASEPTIC TANK TO WÊLL50'456'HOUSE TO SEPTIC TANK21',t 115'APPROXIMATE PROPOSEDOWTS COMPONENTS AND MINIMUM REQUIRED #çmHig.ns** Garfield County, Co Account Number Parcel Number Acres Land SqFt TaxArea 2019Mlll Levy R111913 Physical Address 2397282æ798 13 Owner Address 0 ott 75.5380 0 CARBONDALE 8L623 SUNGOLD HEIGHTS LLC 220 HARMONY LANE CARBONDALECO 87623 2019Total Actual Value Overview Legend ffi Parcels Roads Parcel/Account Numbers Highways m LimitedAccess * Highway --" Major Road -* Local Road "-" Minor Road Other Road Ramp *" Ferry Pedestrian Way Owner Name ffi Lakes&Rivers * CountyBoundary Line $275,0æ Last2Sales Date Prlce 7/23/2O2O $28s,000 70/14/1993 $O Dale crealed:9n/2027 Lâst Deta Uploaded: 9/7 /2021 2:13:39 AM Deveronedbvf;l#Msft 91712021 qPubl¡c.net - Garfield County, CO - Property Record Card: R11'191 3 #qFl¡lllic.rrut'" Garfield County, CO 5ummary Account Parcel Property Address Legâl Descr¡pt¡on Acres Land SqFt TaxArea MlllLevy Subdlvlslon R111913 2391242@198 ,CARBONDALE,CO 81ó23 Section:28 Township:7 Renge:87 A TR lN SENW;AKAJOSEPH'5 MEADOW SUBDIVISION EXEPTION, LOT 3 PER REC #453697. 12.63 ACRES 72.63 0 11 7s.s380 viey{ ¡4aÊ Owner SUNGOLD HEIGHTS LLC 220 HARMONY LANE CARBONDALE CO 81ó23 Land Unlt Type 10 AC TO L,/T 35 AC - 0540 (VACANT LAN D) SquareFeet 0 Actual Values Assessed Year Land Actuâl 2021 2020 20L9 $27s,000.00 $350,000.00 $350,000.00 I m provement Actua I TotalActual Assessed Values Assessed Year $o.oo $275,000.00 2027 $0.00 $350,000.00 2020 $o.oo $3s0,000.00 2079 Land Assessed $79,7sO.OO $101,500.00 $101,so0.00 lmprovement Assessed $79,750.@ 2079 $o.oq $101,500.00 $o-ig $101,5æ.00 $0.00 Total Assessed Tax History TaxYear 20.20 Taxes Billed $7,667.12 çdEklìerctqvj,elryill"q-t3#ìIlformåtiônföJth¡spê{*el.*n*hÊ..G¡rfel{!eoulty c Transfers SaleDate DeedÌypè ReceptionNumber $7,73s20 s6,s79.56 2018 20L7 $6,289.24 Sale PriceBook - PaEe 7/23/2020 WARRANTY DEED ."19..T_4/jeej 70131/1990 0792-OIt8 No data avallableforthefollowlng modules: Bu¡ldings, Photos,Sketches. t.at1{tût bq f¿u þt í¿lrl**d. U;er P¡iv'acy- Ppli.çy GÞEß P4-v..4cYNeti e WHateY-p.Xr-N;2-#-/.2-0..?-1,,J.3;tr3:,3.3.}M-"l er :;i < x t 2.11..1 /:, t:) .".. ?le06z ._ såÉåz 418!Z! $o $28s,000 Plat WARRANTYDEED $122,0O0 TIw*lt¡fetltsy t)#lmdg https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&KeyVatue=R111913 1t1