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Home My WebLink AboutOWTS Design Plan 07.29.24I29 CAINS LANE CARBoNDALE,CO 41623 970.309.5259 GARLA. oSTBERG@GMAIL, COM sirtl'.1.t( : ( :oiYs{tt t.,l.lN<} July 29,2024 Project No. C1892 Hector Brown aircraft@sopris"net Subsurface lnvestigation and Onsite Wastewater Treatment System Design 2-Bedroom Cabin Lot 2, Vanhoose Subdivision Garfield County, Golorado Hector, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 23.461-acre property is located outside of Glenwood Springs, in an area where OWTSs and wells are necessary. Legal Description: Section: 19 Township: 6 Range: 89 Subdivision: VANHOOSE SUBDIVISION Parcel lD: 21 85-1 9341-002 SITE CONDITIONS The property is currently developed with hunting cabin built in 1980. There is no plumbing in the cabin. The residence will be served by a shared well located over 1000-feet to the north of the existing cabin. The proposed soil treatment area (STA) location is an area downhill and to the west of the cabin paralleling the road. The area is vegetated with native grasses and brush. 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 11,2024 by digging one soil profile test pit excavation (Test Pit) Only one Test Pitwas excavated due to limited space available. 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 2.0-feet, underlain by dark brown loam with reddish brown clay loam matrix to a maximum depth explored of 6.5-feet. No bedrock or groundwater was encountered. 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 btocky and consistence was friable. Soiltexture was both gritty and smooth. I Carla Ostberg holds a Certificate of Attendance and Examination fom the CPOW Visual and Tactile Evaluation of Soils Training. Page2 The soil is consistent with Soil Type 3, 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 STA. Test Dense brush upgradient Difficult digging with a small machine Page 3 Test Pit Sieved sample Pags 4 Ribbon 1 to 2-inches in length Test pit DESIGN SPECIFICATIONS Desiqn Calculations: Average basign Flow = 75 GPD x 2 people/bedroom x 2 Bedrooms = 300 GPD LTAR = 0.35 GPD/SF 300 GPD / 0.35 GPD/SF = 857 SF x 1.2 (gravity bed) x 0.7 (GeoMatru with min. 6" sand) = 720 SF While the current configuration of the hunting cabin provides multiple sleeping areas, a remodel is proposed that will result in interior plumbing no more than 2-bedrooms. An average daily wastewater flow of 300 GPD will be used. Forthe purposes of this OWTS design, Benchmark Elevation has been established as 100' (Finished Floor of the Cabin). 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 installation practices. Component elevations may change during installation due to site conditions. Minimum grade refers to piping between components. The 4-inch SDR-35 sewer line exiting the residence must have a double-sweep clean out and a minimum Minimum ElevationOWTS Component Approximate horizontal distance 10'l min. 2o/otall I min.2.5" fall Primary Tank lnlet lnvert Approximate horizontaldistance 48'i min. 1%tall I min.6" fall Distribution Box Approximate horizontal distance 5' / min. 1o/o lall to STA / min. 0.625" fall lnfiltrative Surface The system installation must include a 1OOO-gallon, two-compartment lnfiltrator@ poly septic tank with an Orenio@ Biotube effluent filter on the outlet tee. Any state-approved concrete or poly septic tank may be Page 5 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 two GeoMatrM beds. 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. A 4-inch diameter SDR-35level manifold must be installed to connect each 4-inch diameter perforated lateral in the GeoMatrM beds. Each bed will consist of a minimum of 6-inches sand under three 39" wide GeoMatru sheets. 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. Perforated laterals will be placed on the GeoMatru, under the gray separation fabric. lnspection ports must be installed in the corners of the front of each bed and at the ends of each perforated lateral. 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. Construction must be according to the jurisdiction's adopted On-Site Wastewater Treatment System Regulations, the OWTS Permit, and this design. PERMIT APPLICATION INSTRUCTIONS An OWTS Permit Application must be submitted to Garfield County Environmental Health Department. https:iiwww.oarfield-county.com/environmental-health/filesocco/sites/16/OWTS-Aoplication-Complete- Packet-Dec.-2019.pdf. lf the OWTS PermitApplication willbe submitted with a Building Permit Application, it should be submitted directly to Garfield County Building Department. COMPONENT MANUFACTURER MODEL NO.COMMENTS Septic Tank lnfiltrator@ tM-1060-2CP 1O00-gallon, two- compartment poly septic lank Effluent Filter Orenco@ 4" diameter full size filter Tank Risers and Lids Orenco@ Double-walled PVC Risers ancl [ids (24" diameter) Distribution Box Polylok Distribution box, risers, lid, flow aoualizers (2) GeoMatru Geomatrix Systems, LLC 39" wide 216 lineal feet GeoMatrM Department, 970-945-661 4 x81 50. Page 6 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 offce in advance of insta-ilation. 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 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 properly. The property owner is responsible for maintaining service contracts for manufactured units, altemating STAs, and any other componentrs 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 $TA. 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 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. PageT 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 controlsystem 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. fu,b}stfuxg Carla Ostberg, MPH, REHS PROPERW CBO lnc. 129 Cains Lane Carbondale, Cobrado 81 623 Phone 970.309.5259 cada.ostberg@gmail.mm STA SEPTIC TANK CABIN Brown Cabin Lot 2, Vanhoose Subdivision Garfi eld County, Colorado ProjedNumber: C1892 *t , otngnoza dBsigned by: CBO lnwnby: DD w1 .0 She€t 1 0F 4 CBO lnc. 129 Cains Lane Ca$ondale, Colorado E1823 Pione 970.309.5259 caft.ostbeE@gmail.com 4" DIA SDR-35 SEWER LINE TO EACH BED (MrN. 1%SLOPETOBED) 4'DIAMETER, SOLID, LEVEL MANIFOLD 3 ROWS OF 39'GEOt\ilAT IN BED CONFIGURATION 4' DIA SDR.35 INSPECTION PORT AT FRONT CORNERS 4" DIA PERFRATED PIPE LATERAL PLACED ON TOP OF GEOM,AT GEOMAT FABRIC OVER4' PERFORATED LATERAL TWO (2) 10' X 36' BEDS WTH 6'OF SAND ON BASE AND 3 SHEETS OF 39" GEOMAT. DEPTH OF BED TO REMAIN SHALLOW, APPROXIMATELY2' BELOW GRADE. 4" DIA SDR-35 INSPECTION PORTAT END OF EACH LATERAL TP1 EXISTING OUTHOUSE TO BE ABANDONED DISTRIBUTION BOX WTH ACCESS AT GRADE 2.8=DROOM CASBIN Brown Gabin Lot 2, Vanhoose Subdivision Garfield County, Colorado Projec{ Numben C1892 4" DIA SDR-35 SEWER MIN 2olo FALL TO TANK SEPTIC TANK WITH OOO-GALLON, 07n9nn4 by: DD bf CEO SCREEN WTH CLEANOUT CALL811 FOR UTILITY LOCATES Sheet 2 0F 4 w2.0 CBO lnc. 129 Cains Lsne Catbondale, Colorado 81 623 Phone 970.309.5259 carla,os{berg@gmail.com Brown Cabin Lot 2, Vanhoose Subdivision Garfi eld County, Colorado Project Numbon C1892 l. )( Dr NOTE;6" SAND ON B{SE OF EACH ,IO'X 36, BED DISTRIBUNON BOX ACCESS AT GRADE DEPTH OF BED TO REMAIN SHALLOW APPROXIMATELY 2' BELOW GRADE SOLID PIPE LEVEL MANIFOLD 4" DtA SOR-35 EFFLUENT PIPE FROi' SEPTIC TANK GEOMAT INSPECTION PORT AT END OF EACH LATEML 10' 4'DIA PERFMTED PIPE TATERAL PLqcED oN ToP oF GEoMAT n cEoMAT il FABRtc ovER 4' LATERAL INSPECTION PORT AT FRONT CORNERS OF BED 3 SHEETS OF 39'GEOIilATfr IN 8ED CONFIGUMTION /T G€OMAT PLAN\rr---FnE Finished Grade lnspsction 12' Minimum Cw6 Fabric Distibution Pipe Go[,tat Memb€re 6" SAND 'sEcoNomY $Nv EFFECTIVE SEE = 0.15- 060mfr uNFOrutW COEFFI0EM 37.0 % FTNESPASSTNGffiSM:3.0 HygtMpb /iGEOilAT SECTIo|.I\tr---TE A STA SECIION\gr-"-rrrE ei 07f29n024 signed by: CBO lwn by: DD Sheet 3 0F 4 w3.0 CBO lnc. 129 Cains Lane Carbondale, Colorado 81 623 Phon€ 970.309.5259 carla.Gtberg@gmail.com Brown Gabin Lot 2, Vanhoose Subdivision Garfield County, Colorado Project Number: C1892 D D D DESIGN 2AEDROOiI CABIN (75 GPD x 2 PERSoII9tsEDROOM x2 BEDROoMS) WASIEWAIER FLOYI/ = 300 GPD TANK MIN. 1OOO GALLONS USE IOOGGALLON, TWO.COMPARTMENT POLY SEPNC TANK SOIL TREATMENT AREA (STA): LONG IERM ACCEPTANCE RAl€ (LTAR) = 0.36 GAU SF CALCUTATED STA = Q/LTAR = 300 / 0.3s = 857 SF GMVITY, BEDS = 857 SF X 1.2 = 1028 SF CHAMBERS = 1028 SF X 0.7 = 720 SF (2) 10'X 36'BEDS, Wllr (3) 39'SHEETS OF GEOMAT OVER MtN. 6" SAND FILTER MATERIAL ON EACH BED SOIL PROFILE TEST PIT NO. ,I -0 -1 2 4 -5 6 -7 I -g -ro DARK BROWN LOAI'iIY TOPSOIL LEGEND F topsoil A aavwn FUujr TFcuo DARK BROWN LOAM WTH MOIST REDDISH BROWN CLAY LOAM MATRIX (soME LARGE BOULDERS 18'-24" tN DlAMEIER) BOXAND COVER BROUGHTTO GRADE CONCRETE SPRINKLE BOXAT GISLIP-ON PVC ffiG6r DO NOT GLUE FINISHED GI 4'DIA INSPECI'ION PIPE NO GROUNDWATER OR BEDROCK ENCOUNTERED DURING EXCAVATION 1/4'DtA H( INTO TWO FOR VENI (BELOWS BAFFLE OR ANGLED PIPE TO BE USED STA MEDIA AT INLET ASOILS LOGLg,_______rr.f!r@ ADISTRIBUTION BOX DETAIL\9|-rFEE AINSPECIION PORT DETAIL\y-r1rg!l OUTLETS oooo tei O7DgnO24 signed by: CBO awn by: DD ADE LE DRITTED SIDES OF PIPE LATION rP oN cAP) IVALVE ADE w4.0 Sheet 4 0F 4 a Well Constructed I Final Permit r Ground Water x Geophysical Log [] County f Superfund Sites Legend tr! [t dh ?l .r,i I ': ..r1.: u'.iI ,- 'r fl 5 Location Notes Map Viewer /DWn LO nADO'S Support tyrt(ttt 0 mis produd is for lnformational purposes and may not have been prepared for, or be suitable for legal, engineeing, or suNeying purposos. Ussrs of th,'s information should rwiew or consuft the primary data dnd information eurces to as@rtain the usabilry d the information. Date Prepared: 8/14m24 3i16:13 PM 2,339 Feet1,1690 1: 14,032 2,339 Cno 6qPublic.net* Garfield CountY, CO Total Actual Value Overview Legend I Parcels Roads Parcel/Account Numbers OwnerName ffi Lakes&Rivers - countyBoundary Line $432,310 Last2Sales Date Prlce 70/18/2019 $300,000 4/14/L999 $40,000 Account RO7O[26 Physical 0 Number l\ddress Parcel Number 2785!9341002 GLENWOODSPRINGS Acres 23 OwnerAddress BROWN' HECTOR landSqFt O 1172COUNryROAD 116 TaxArea 128 GLENWOOD SPRINGS CO Mill Levy 60.9540 81601 D ate cr eated: 7 I 29 I 2024 Last Data Uploaded;T /2912Q24 2:O9:48 AM Deverooed bv(.) Fs!,sFjder 81601 7129124,9:40 AM Garfield County, CO Summary qPublic.net - Garfield County, CO - Property Record Card: R070126 Account Percel Propefi Address l-egal Descrlption Acres Land SqFt TaxArea MlllLevy Subdlvision RO70726 2185L934t0o.2 , GLETIWOOD SPRINGS, CO 81601 Section: 19 Township: 6 Range: 89 Subdivislon: VANHOOSE SUBDIVISION Lot: 2 23.462 ACRES 23.467 0 728 60.95lm VANHOOSESUBDIVISION View Mao Map Owner BROWN. HECTOR 1172COUNTYROAD 116 GLENWOOD SPRINGS CO 81601 Land UnltType SINGLE FAM.RES.'LAND - 1112 (RESIDENTIAL PROPERTY) SquareFect 0 7129124,9:40AM Buildings Bullding# Unlts BuildlngType Abstract Codes / (Property Typ€' Architectural Style Storles Frsme Actual Year Built Gr$sLivln8Area Total Heated SqFt Bedroome Baths Heatlng Fuel HoatlngTyp€ Alr Conditloning RoofType RoofCover Actual Values TaxVear Actual Value Assessed Values TaxYear Assessed Value Tax History TaxYear Taxes Billed Transfers Sale Date 70/18/2019 4/t4/t999 7/73/7978 qPublic.net - Garfield County, GO - Prcperty Record Card: R070'126 t 1 SFR SINGLE FAM.RES.IMPROVEMTS. 1212 (RESI DENTIAL PROPERTYI 1 1/2 STRY 2 WOODFRAME 1980 1,716 T,LT6 1 0 wooD WOODSTOVE NONE RIDGE FRME PRO PANEL Click here to view the tax information for this oarcel on the Garfield Countv Treasurer's website. 2024 $432,310.00 2024 $28,970.00 2023 $372310.@ 2023 s25280.00 2023 $7,540.92 2022 $293,850.00 2022 $20,430.00 2022 $1392.80 202L $293,860.00 202I $21,020.00 202t $tArt96 2020 $268,030.00 2020 $19,160.00 2020 $7,202.16 Sale Prlce $300,000 $4o,ooo $30,000 Deed Type WARRANTYDEED WARRANryDEED WARRANTYDEED Reception Number 926984 544026 2A6983 Book - Page 7725-37 512-747 Property Related Public Documents Click here to view Propertv Related Public Documents Photos -T{ t. ' l' a a t. q' I J -F WBA/wBA 32 sf ONE 36 sf 14'. 38' (0lr 4', i)GI WBA 392 sf 4 ONE 56 sf 16' b 10' 4tt tD 4 rf @ 4'. $t f.l ONE8sf owH 492 sl ONE 8sf ONE 24 sl 7ngl24,9140AM qPublic.net - Garfield County, CO - Property Record Card: R070126 {WBA 32 sf The Garfield County Assessor's Office makes every effort to produce the most accurate information possible. No warranties, expressed or irnplied are provided for the data herein, its use or interpretation. Data is subject to constant clrange and its accuracy alld completeness cannot be guaranteed. I User Privacv Policv I GDPR Privaeyl!a!!ec Last D.glj,a Uoload: 7 /29 /2024, L2:O9:48 AM Contact Us Developed by 6)*FEr.idrr hftps:l/qpublic.schneidercorp.com/Application.aspx?ApplD='1O38&LayerlD=22381&PageTypelD=4&PagelD*9447&Q=165638632&KeyValue=R070126 313