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Home My WebLink AboutOWTS Design Report 03.09.2026129 CAINS LANE CARBONDALE, CO 81623 970.309.5259 CARLA.O575ERG@GMAI L.00M March 9, 2025 Thaddeus Eshelman thad tebuilders.net RlEcFwEv rJ �, GAIRFIELD COUNTY C0MM1JMITY DEVE1_fiI MEAT Subsurface Investigation and Onsite Wastewater Treatment System Design 2-Bedroom Accessory Dwelling Unit (ADU) 7380 CR 100 Garfield County, Colorado Thaddeus, Project No. C1943 CBO Inc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 2.0-acre property is located outside of Carbondale, in an area where OWTSs and wells are necessary. Legal Description: Section: 18 Township: 7 Range: 87 Subdivision: PIONEER POINT SUBDIVISION Lot: 2 2.113 ACRES Parcel ID: 2391-181-01-002 SITE CONDITIONS The property is currently developed with a residence on the eastern portion of the property. This residence is served by a separate OWTS. A 2-bedroom Accessory Dwelling Unit (ADU) is proposed. The proposed ADU will be served by the OWTS outlined in this design. The residence will be served by a well located on the adjoining property to the east. The well is greater than 50-feet from the proposed septic tank and greater than 100-feet from the proposed soil treatment area (STA). The proposed STA location has a bench with an approximate ten percent slope to the southwest. The topography shown on the site plan is not representative of actual topography. The proposed area is vegetated with sage and native grasses. Stake depicts side NW corner of ADU Page 2 A 20-foot wide Holy Cross electrical easement is present to the south and west of the proposed STA. This easement should be clearly marked to avoid encroachment during construction of the STA. 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 February 21, 2025 by observing a cut for the foundation of the ADU. A visual and tactile soil analysis was completed by Carla Ostberg. I Prior to excavation of the STA, an additional soil profile test pit must be excavated near the area of the proposed STA. This office must be contacted to evaluate the soils to assure they are consistent with those observed in the foundation cut. The materials encountered in the excavation (referenced as Test Pit #1 on the site plan) consisted of dark brown topsoil to 1.0-feet, underlain by tan to whitish calcareous clay matrix with scattered angular rock to a maximum depth explored of 10.0-feet. No bedrock or groundwater was encountered. Soil structure grade was moderate. The soil formed a ball and a ribbon less than 1-inch in length before breaking. Soil structure shape was blocky and consistence was friable. Soil texture was more gritty than smooth. The calcareous clay matrix soil is consistent with Soil Type 2 with moderate structure grade. A long- term acceptance rate (LTAR) of 0.6 gallons per square foot will be used to design the STA. L [� 1 s... e pal Excavation for ADU ' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 3 16 } Peds --�-.r• 140 Sidewall slightly weathered DESIGN SPECIFICATIONS Design 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 = 500 SF x 1.2 (gravity, bed) x 0.7 (GeoMatTM over 6" sand) = 420 SF 10' x 42' bed with (3) 39" wide sheets of GeoMatTM over 6" sand 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 at grade 7038' has been established as 100' (Finished Floor). CBO Inc, should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. OWTS Component Elevation Primary Tank Inlet Invert _Minimum Approximate horizontal distance 9' / min. 2% fall / min. 2.25" fall Distribution Box Approximate horizontal distance 32' / min. 1 % fall / min. 4" fall Infiltrative Surface Approximate horizontal distance 2' / min. 1 % fall to STA / min. 0.25" fall *Elevations are based upon standard UNV 1,5 installation practices. component elevations may cnanye Uumly installation due to site conditions. Minimum grade refers to piping between components. Page 4 The 4-inch SDR-35 sewer line exiting the residence must have a double -sweep clean out and a minimum 2% grade to the septic tank. The system installation must include a 1000-gallon, two -compartment Infiltrator® poly septic tank with an Orenco® Biotube effluent filter on the outlet tee. Any state -approved concrete or poly septic tank may be substituted. Risers must bring the manhole lids to grade for access. If 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 three distribution laterals. 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 lateral. A level manifold may be used in place of the distribution box, if desired. The STA will be 10' x 42' with 6-inches of sand filter material placed in the bed excavation. Sand filter material must be clean, coarse 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. Three 39" wide GeoMatTM sheets will be placed on top of the sand filter material the entire length of the bed. A 4-inch diameter perforated pipe will be placed down the center of each GeoMatTM sheet, under the top layer of fabric. The STA will consist of a total of 126 linear feet of 39-inch wide GeoMat",'. All material associated with the GeoMat"I installation must be proprietary products associated with the GeoMatTm, including the geotextile fabric. Manufacturer instructions must be followed regarding installation of the GeoMatTM. Inspection ports must be installed at each corner of the bed. Inspection ports will also be tied onto the end of each 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 GeoMatTM. COMPONENT SPECIFICATIONS The component manufacturers are typical of applications used by contractors and engineers in this area. CBO 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. COMPONENT MANUFACTURER MODEL NO. COMMENTS Septic Tank Infiltrator® Item # IM 1060-2CP 1000-gallon, two -compartment poly septic I hank Tank Risers and Lids Orenco®Double-walled PVC Risers and (Lids (24" diameter) Effluent Filter Orenco® Full size 4" diameter Distribution Box Tuf-tite Min. 3 outlets, risers, lid, (3) speed levelers GeoMatT"" eoMatrix Systems, 39" wide sheets 126' GeoWlatTm LLC Construction must be according to the jurisdiction's adopted On -Site Wastewater Treatment System Regulations, the OWTS Permit, and this design. Page 5 PERMIT APPLICATION INSTRUCTIONS An OWTS Permit Application must be submitted to Garfield County Environmental Health Department. https:llwww.garfield-county comlenvironmental-health/filesgcco/sites/16/OWTS-Application-Comgiete- Packet-Dec.-2019. df. If the OWTS Permit Application will be submitted with a Building Permit Application, it should be submitted directly to Garfield County Building Department. All questions regarding permit submission can be directed to Garfield County Environmental Health Department, 970-945-6614 x8150. INSTALLATION CONTRACTOR CBO Inc. 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 Inc. 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 Inc. should be notified 48 hours in advance to observe the installation. In 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 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. Page 6 If an effluent filter or screen has been installed in the OWTS, we recommend this filter or screen be cleaned annually, or as needed. If 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 If 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. If soil conditions encountered are different from conditions described in report, CBO Inc. 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 Inc. 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Y .u'73 03010 LAi3GHING STOCK LILP aR-MWELD-MQORE -�•° SUNEMERS �23991 - ' 0Q39 239118400037 9 =i Account R083332 Physical Number Address Parcel 239118101002 Number Owner Acres 2 Address Land SgFt 0 Tax Area 011 Mill Levy 74.4140 Date created: 3/9/2025 Last Data Uploaded: 3/7/202510:43:21 PM Developed by ` SCHNEIDER v OEOSPATIAL Overview Legend Parcels Roads Parcel/Account Numbers Owner Name Lakes & Rivers County Boundary Line 7380100 COUNTY RD Total Actual $65,570 Last 2 Sales Value Date Price CARBONDALE 81623 n/a $ ESHELMAN, THADDEUS BACON & MAKENZIE n/a $ TAYL 7380 COUNTY ROAD 100 CARBONDALE CO 81623 J 3/9125, 1:45 PM gPublic.net - Garfield County, CO - Property Record Card: R083332 Garfield County, CO Summary Account R063332 Parcel 239118101002 Property 7380100 COUNTY RD, CARBONDALE, CO 81623 Address Legal Section: 18 Township: 7 Range: 87 Subdivision: PIONEER POINT Description SUBDIVISION Lot: 2 2.113 ACRES Acres 2 Land SgFt 0 Tax Area 11 Mill Levy 74.4140 Subdivision PIONEER POINT SUBDIVISION{ k• View Mau Map Owner ESHELMAN, THADDEUS BACON & MAKENZIE TAYL 7380 COUNTY ROAD 100 CARBONDALE CO 81623 Land UnitType SINGLE FAM.RES:LAND-1112(RESIDENTIAL PROPERTY) Square Feet 0 Buildings Building# 1 Units 1 Building Type SFR Abstract Codes/(Property Type) SINGLE FAM.RES-IMPROVEMTS-1212 (RESIDENTIAL PROPERTY) Architectural Style 2-STORY Stories 2 Frame WOOD FRAME Actual Year Built 2000 Gross Living Area 1,546 Total Heated SgFt 1,546 Bedrooms 2 Baths 2 Heating Fuel GAS Heating Type FORCED AI R Air Conditioning NONE Roof Type RIDGE FRME Roof Cover PRO PANEL https:llgpublic.schneidercorp.com/Application.aspx?Appl D=1038&LayerlD=22381 &PageTypel D=4&Pagel D=9447&0=253058166&KeyValue=RO83332 1 /3 3/9/25, 1:45 PM Tax History Tax Year Taxes Billed gPublic.net - Garfield County, CO - Property Record Card: R083332 2024 2023 2022 $4,637.48 $4,519.32 $3,212.80 Cfkk here to view Ilse tax intnrmatinn (of that Owe on the Garfield Cofmly Treasumr'gwrlfs{te Transfers Sale Date 3/30/2022 Deed Type I BARGAIN AND SALE DEED 3/11/2022 _ AGREEMENT 2/18/2022 COVENANTS 11/22/2017 QUITCLAIM DEED 1/6/2014 SPECIAL WARRANTY DEED 12/23/2013 8/16/2013 SPECIAL WARRANTY DEED COVENANTS 8/16/2013 COVENANTS 8/12/2013 Plat 1/21/2013 RESOLUTION 4/23/2008 RESOLUTION 10/10/2003 QUITCLAIM DEED 10/10/2003 AFFIDAVIT 10/10/2003 AGREEMENT 10/16/1981 WARRANTY DEED Property Related Public Documents Click heretoviewproperty Refalee Public Documents Photos rww V--w- Sketches Number _ _ Book -Page 92 50 900186 638446 1528.613 638445 1528-609 638444 1528-607 320331 0583-0568 2021 $3,254.08 Sale Price $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $2 000 https:Hgpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=253058166&KeyValue=RO83332 2/3 4 3/9/25.1:45 PM qPublic.net - Garfield County, CO - Property Record Card: R083332 29' SHOP 1682 sf Ln Ln FCP in 435 sf Lr 29' I B.Or v 227 ORY cd sf — 1112 STORY b 552 sf CID cv 24.0' 04 7.0' jo-Q, 7.0' FOP I STY b 56 sf 1 80 sf 06 1 hC C I I fi c1(1 0uT) Ly lllf(, IT r i .,)rl 11 t N ic I th Ll'," or liilui ;)rf ,�' on it,, i t to :1 %1IL 1 ,(1 it �.. r 11r;T( y ; 1,j I it :,I not 1j; glial ant , J yVL—-Privacy Pulley G�PR Privacy Last data U111(jpd. 3L7/Z_Q?5 8.4j.'LILPM SCHNEIDER https:/Iqpublic.schnaidercorp.com/Application.aspx?ApplD=l 038&LayerlD=22381 &PageTypelD=4&PagelD=9447&Q=253058166&KeyValue=RO83332 3/3