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Home My WebLink AboutOWTS Design129 CAINS LANE CARBONDALE, CO A1623 970.309.5259 cARLA. OSTBERG@GMAIL. COM stl.:1"1. I (t ( :()¡a9tt :r_,1.I N(; September 23,2021 Project No. C1666 Ryan and Lisa Briscoe lisa.elementph@gmail.com Subsurface lnvestigation and Onsite Wastewater Treatment System Design 4-Bedroom Residence Lot 6, Gilead Gardens Garfield County, Colorado Ryan and Lisa, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 2.078-acre property is located outside of New Castle, in an area where OWTSs are necessary. Legal Description: Section: 7 Township: 6 Range: 91 NW Subdivision: GILEAD GARDENS Lot: 6 Parcel lD: 2181-073-03-006 SITE CONDITIONS The property is currently undeveloped. A 4-bedroom residence is proposed The residence will be served potable water from a shared well located on a neighboring property to the east. The well is greater than 5O-feet from the proposed septic tank and greater than 1OO-feet from the proposed soil treatment area (STA). The water line will not come within 25-feet of any proposed OWTS component. A ditch runs along the west property boundary and then turns to the east as it gets farther north. The STA must be at least S0-feet from the ditch and at least 1O-feet from any property line, specifically the east property line. The proposed STA has an approximate 5-10% slope to the northwest. 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. Page2 SUBSURFACE The subsurface was investigated on Septembet 10,2021by 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 medium brown clay loam to a maximum depth explored of 8.O-feet. 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 moderate. The soilformed a ball and a ribbon 1 to 2-inches in length before breaking. Soil structure shape was blocky and consistence was friable to firm. Soiltexture was both gritty and smooth. The materials encountered in Test Pit #2 consisted of medium brown sandy clay loam to a maximum depth explored of 8.O-feet. No bedrock or groundwater was encountered. A sample of the soils was taken from Test Pit #2 at3-feet below grade. Soil structure grade was moderate. The soil formed a ball and a ribbon just over 1-inch in length before breaking. Soil structure shape was blocky and consistence was friable. Soiltexture was more gritty than smooth. We recommend shifting the STA toward the ditch, just outside of the required SOJeet setback. STA sizing is based on Soil Type 3, Sandy Clay Loam to 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. Test Pit #1 I Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 3 f'\ r''.1.i :i I 'i li ,. !!,, Sieved sample Ribbon between 1 and 2 inches Test Pit #2 I note small gravel horizon Backfill Page 4 Sieved sample Ribbon just over 1-inch DESIGN SPECIFICATIONS Desiqn Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 75 GPD (4th bedroom) = 525 GPD LTAR = 0.35 GPD/SF 525 GPD / 0.35 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 1050 SF The new OWTS design is based on 4-bedrooms. An average daily wastewater flow of 525 GPD will be used. Page 5 For the purposes of this OWTS design, Benchmark Elevation at grade 5214.03' has been established as the Finished Floor (Lower Level). 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. The system installation must include a minimum 125O-gallon, two-compartment Valley Frecast concrete septic tank 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 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 trench. Each trench will consist of 15 'Quick 4' Standard Plus lnfiltrator@ chambers for a total of 1080 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. 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 Component Minimum Elevation Primary Tank lnlet lnvert Approximate horizontal distance 40' / min. 2o/o fall I min. 10" fall Distribution Box Approximate horizontal distance 38' / min. 1% fall I min.4.75" fall lnfiltrative Surface Approximate horizontal distance 45' to furthest trench / min. 1% fall / min. 5.625" fall to furthest trench COMPONENT IMANUFACTURER MODEL NO ICOMMENTS Septic Tank lVatleV Precast tM-1250T-2CP l1 250-9allon, 2-compartment lconcrete septic tank Biotube Effluent Filter lorenco@ lFull Size Effluent Filter and lhousinq fank Risers and Lids lorencoo lDouble-walled PVC Risers and llios lza" diameter) I Distribution Box leotvlor lDistribution box, flow lequalizers, risers, lid Chambers llnfiltrator@ Standard Plus 190 'Quick 4' Standard Plus lchambers 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 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 vegetationcover' opERATIoN INF'RMATT.N AND MATNTENAN.E 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 additionalwater 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 fllter 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. Page 7 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. (ø.n{a- tttúxng Carla Ostberg, MPH, REHS Ð qPublic.net'" Garfield County, CO Overuiew Legend fJ Parcels Roads Parcel/Account Numbers Highways - LimitedAccess - Highway Major Road . Local Road - Minor Road Other Road Ramp -- Ferry Pedestrian Way Owner Name i I Lakes&Rivers - CountyBoundary Line AccountNumber RM4634 ParcelNumber 21810730300ó Acres 2 LandSqFt 0 TaxArea 023 2019MillLew 67.0920 Date qeated:9/2512O27 Last Data Uploaded: 9/25/2021" 2:O2:L9 AM Deve rooed bv (Él F..þg,p¡,4çf PhysicalAddress 0 NEWCASTLE 81647 Owner Address BRISCOE, RYAN & LISA PO BOX452 NEWCASTLE CO 87647 2019 Total Actual Value $1,280 Last 2 Sales Date Price s/28/2O2! $142,000 8/20/2013 $O i 9125121 ,2:54 PM Summary qPublic.net - Garfield County, CO - ProperÇ Record Card: R044634 ÐqPublic.llêf" Garfield County, CO Account Parcel Propefi Address Legal Description Acres Land SqFt TaxArea Míll Levy Subdivision RO44634 21810730300ó ,NEWCASTLE,CO 81ó47 Section: TTownship: ó Range: 91 NWSubdivision: GILEAD GARDENS Lot:6(2.079 ACx\ 2.O78 o 23 67.0920 GILEAD GARDENS Deed Type WARRANTYDEED WITHDRAWAL OF NOTICE NOTICE Permit Plat View Map Owner BRISCOE, RYAN & LISA PO BOX452 NEW CASTLE CO 81ó47 Land Unit Type IRRIGATED LAND-AGRICIrRL. - 4117 (AGRICULTURAL PROPERTY) Square Feet 0 Actual Values Assessed Year Land Actual lmprovement Actual Total Actual Assessed Values Assessed Year Land Assessed lmprovement Assessed Total Assessed Tax History 2021 $1,280.00 $o.oo $1,280.00 202t $370.oo $o.oo $370.oo 2019 $0.ó4 2020 $1,2ó0.00 $0.00 $1,2ó0.00 2020 $370.00 $o.oo $370.00 2018 $0.ó4 20t9 $20.00 $0.00 $20.00 2079 $1o.oo $o.oo $1o.oo 2017 $o.só 2020 $24.84 Click here to view the tax information for this p-elggLgübglaIlCþ y Trg5!_t9lþgçEjle. Transfers Tex Year Taxes Billed Sale Price $t42,00o Sale Date 5/28/2027 8/20/2073 6/6/2013 70/6/2007 9/74/2007 Reception Number 839t*- 83ó53ó 733795 733197 Book - Page $o $o $o $o https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=1644392187&KeyValue=R044634 112 912512'1,2:54 PM qPublic.net - Garfield County, CO - Property Record Card: R044634 9/7/2007 8/29/2007 8/29/2007 8/28/2007 6/26/2007 5/ra/2007 t7/3/2003 3/14/2003 7/13/2003 L/13/2003 t/22/2001 7/22/2007 4/73/1999 4/13/7999 4/13/1999 6/4/7998 6/4/7998 9/9/r994 72/37/79AO 5/8/1979 5/8/1979 4/30/7973 6/6/t969 EASEMENT DECLARATION AGREEMENT EASEMENT AGREEMENT EASEMENT RESOLUTION coRRECT|ON QUtTCLAtM QUITCLAIM DEED STATEMENT OF AUTHORITY BOUNDARY LINE ADJUSTMENT QUIT CLAIM DEED QUITCLAIM DEED QUITCLAIM DEED QUITCLAIM DEED QUITCLAIM DEED QUITCLAIM DEED WARRANWDEED WARRANTY DEED QUITCLAIM DEED WARRANTYDEED WARRANTYDEED WARRANTYDEED 733792 733196 733194 733793 727250 757585 640794 625?46 6L8929 é78928 575239 575238 544rr8 544718 544r18 529632 528642 468279 370902 294830 294Lt7 258q39 243549 7946-869 $o $o $o $o $o $o $o $o $o $o $o $o $o $o $o $o $o $o $o $o $o $32ó,000 $10,s00 1535-775 1462-370 1428-437 1428-436 1228-440 1228-437 7125-329 1725-328 rr25-327 1081-0048 to77-o874 0975-0429 0563-0144 0529-0672 o528-O296 0443-0516 o402-0263 Photos No data available for the following modules: Buildings, Sketches. The GarfrcicJ Coullt), Assessor's Olfice nral<es every effort to p|ocluce the most accurate infornration possible. No vvarranties. cxpressed or inrplìcd arc, provicled for the clate herein. its Lrsc or inte;rpretation. Data i! subject to corìslant changc anci iis accuTacy and com¡rleteness canr.Jot be guaranteerJ. Us.el Pr-iv.açv*P9Lçy ÇÐPB Srjya-cy_trojrc-c Lasl-D:!a-l,lp-þadJ12-5/2o2-1-12,9?!2-AM Vers¡on 2.3.148 L)evelopecJ by C)9."þg,B;,4çl + https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=1644392'187&KeyValue=R044634 212 1 \ )lt1,2.0 STA 4 + Iot 6 + TP TP1 RDPROPOSED PROPOSED /// AREA I 90,584 Sq Ft 2.08 Ac. - DITCH/ EASEMENT 4-BEDROOM RESIDENCE .J" (o N SCALE: 1 = 50'=0" -? "5";^4- ènoä?nto.^ ?ol¿bz DRAWINGS MUST BE USED IN CONJUNCTION WITH DESIGN LETTER DATED 0912312021 SITE PLAN Date: 0912312021 Designed by: CBO Drawn by: DD Briscoe Residence Lot 6, Gilead Gardens Garfield County, Colorado Project Number: C1666 CBO lnc. 129 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com ft! e- l's Iot 4\3F\ Þ RTY LINE MATE WATERLINE LOCATION Cørden ClrcIe + /t Qor. ¿ THE LOCATION OF PROPOSED IMPROVEMENTS SHOWN ARE NOT THE RESULT OF A PROPERW SURVEY. THE LOCATIONS ARE APPROXIMATE. IT IS THE HOMEOWNERS'DUTYTO ENSURE ALL CONSTRUCTION AND IMPROVEMENT LOCATIONS ARE ACCURATE. PROPERTY LINES AND SETBACK DISTANCES SHOULD BE CONFIRMED PRIOR TO EXCAVATION. SCALED FOR PRINTING ON 11" X17" PAPER. 4f4 od $ w1 .0 Iot 5 Sheet 1 0F 4 1t) >+oo O N \=\ N\Ð Øot 4 4' DIA SDR.35 INSPECTION PORT AT BEGINNING AND END OF EACH TRENCH T + > > 'QU ICK-4' CHAMBER TRENCHES. 6 TRENCHES WITH 15 CHAMBERS PER TRENCH FOR A TOTAL OF 90 CHAMBERS AND 1O8O SF. tN. so'SETBAoK To Dtrct{-l + rP2 30'EASEMEN] DSCAPE, I RRIGATION, TRAILS, DOMESTTC WATER) PROPOSED 4" DIA SDR-35 SEWER LINE TO EACH TRENCH (MrN. 1% SLOPE TO TRENCH) DISTRIBUTION BOX WITH ACCESS AT GRADE 4" DIA SDR-35 PVC S R LINE (MrN. 1% FALL TO D-BOX) 25o-GALLON, TWO-COMPARTMENT SEPTIC TANK WITH EFFLUENT SCREEN SCALE: 1" = 20'-0" \ \ o(,ù \o \ì \ \ N\h \ \ w (t U) w il-l 4Z 6)(/) TP1 PROPOSED 4-BEDROOM RESIDENCE FF LL = 5214.03' \5bz LINE APPROXI WATER LINE LOCATION ezLo ezz\ 6z22 4" DIA SDR.35 SEWER PIPE WITH CLEANOUT MIN 2% FALL TO TANK Ø 5z\4 w2.0 20'DtTCH EASEMENT Date: 0912312021 Designed by: CBO Drawn by: DD Briscoe Residence Lot 6, Gilead Gardens Garfield County, Colorado Project Number: C1666 CBO lnc. 129 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com 5?\6 .ø&' 5225 Sheet 20F 4 { DISTRIBUTION BOX WITH AT GRADE INFILTRATOR END PLATE 4" DIA SDR-35 INSPECTION PORT AT BEGINNING AND END OF EACH TRENCH 60' 15 CHAMBERS PER TRENCH CH SOIL 4'min GRAVELLESS 'QUICK-4' CHAMBER (4'x 3') 4 tn . DIA SDR-35 INSPECTION PORT 2'min 4'DIA SDR-35 EFFLUENT PIPE FROM SEPTIC TANK TOP PORT OF CHAMBER END PLATES 4" DIA SDR-35 DISTRIBUTION LINE TO EACI{ TRENCH (MrN. 1% SLOPE TO TRENCH) PLACED IN COMPACT BASE TO SUPPORT BOX USE HOLE SAW TO CUT THRU TOP OF END PLATE BOX AND COVER BROUGHT TO GRADE CONCRETE LID F INSHED SMALL VALVE COVER BOX OR IRRIGATION VALVE BOX AT GRADE ATTACH CAP OR THREADED CLEANOUT ASSEMBLY 4" PVC PIPE CUT TO FIT -BAFFLE OR ANGLED PIPE TO BE USED AT INLET AIL AIL 4',max L UN lLIMIT EXCAVATION SCARIFY SURFACE GRAVELLESS 'QUICK-4' CHAMBER (4'x 3') w3.0 IIII I II OUTLETS oooo Briscoe Residence Lot 6, Gilead Gardens Garfield County, Colorado Project Number: C1666 Date: 0912312021 Drawn by: DD by: CBO CBO lnc. 129 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com Sheet 3 0F 4 DESIGN 4.BEDROOM RESIDENCE 75 GPD x 2 PERSONS/BEDROOM x 3 BEDROOMS + 75 GPD (4TH BEDROOM) WASTEWATER FLOW = 525 GPD TANK: MIN. 1250 GALLONS USE 125o-GALLON, TWO-COMPARTMENT CONCRETE SEPTIC TANK SOIL TREATMENT AREA (STA): LONG TERM ACCEPTANCE RATE (LTAR) = 0.35 GAL/ SF CALCULATED STA = Q/LTAR = 525 10.35 = 1500 SF GRAVITY, TRENCHES = 1500 SF X 1.0 = 1500 SF CHAMBERS = 1500 SF X 0.7 = 1050 SF I 12 SF / CHAMBER = 88 CHAMBERS SIX GRAVELLESS CHAMBER TRENCHES 15'QUICK 4' CHAMBERS IN EACH TRENCH TOTAL 90 'QUICK 4' CHAMBERS SOIL PROFILE TEST PIT NO. 1 MEDIUM BROWN CLAY LOAM NO GROUNDWATER OR BEDROCK ENCOUNTERED DURING EXCAVATION 10 SOIL PROFILE TEST PIT NO.2 0 1 MEDIUM BROWN SANDY CLAY LOAM F lrJ IUIL I IFfL lU Õ 2 3 4 5 o 7 8 I + 4'DIA SDR-35 SEWER LINE (MtN 2% SLOPE TO TANK, MrN. 1% TO STA) SCREENED ROCK OR SAND FOR BEDDING SLIP-ON PVC DO NOT GLUE INSULATED COP TRACER WIRE 4" DIA SEWER LINE FINISHED GRADE HOUSE AN OUT DETAIL 24'MlN 3" MlN. FINISHED GRADE TO TANK-+ I'MlN. TRENCH DETAIL w4.0 LEGEND n sandy clay loam to clay loam BACKFILL Date: 0912312021 Designed by: CBO Drawn by: DD Briscoe Residence Lot 6, Gilead Gardens Garfield County, Colorado Project Number: C1666 CBO lnc. 129 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com Sheet 4 0F 4