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Home My WebLink AboutOWTS DesignREÜË¡VED APR 2 I 2Û?2 GARFIELD COUNTY COMMUIIITY DEVELOPMENT129 CAINS LANE CARBONDALE,CO 41623 97ç^.309.5259 cARLA, osTB ERG@GMAIL. COM strtl"t r( : ( :()FIstf J f -'t'rN(; March 15,2022 Project No. C1675 Matt and Julie Fadden c/o Richard Stumpf richard@ristumpf.com Subsurface lnvestigation and Onsite Wastewater Treatment System Design 5-Bedroom Residence TBD Weeping Willow Lane Lot 9, Roaring Fork Preserve Garfield County, Colorado Matt and Julie, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 15.411-acre property is located outside of Carbondale, in an area where OWTSs and wells are necessary. Legal Description: Section: 36 Township: 7 Range: 88 Subdivision: ROARING FORK PRESERVE Lot: 9 AS PER FIRST AMENDED PLAT RECEPTION NO. 945740 15.412 ACERS Parcel lD: 2393-363-19-009 SITE CONDITIONS The property is currently undeveloped. A 5-bedroom residence and equipment barn are proposed. The equipment barn will have plumbing but will be an auxiliary use to the residence. The property will be served by a private well on the property. At the time of this design, the well had not been drilled. The well must be at least S0-feet from the proposed septic tank and at least 1O0-feet from the proposed soiltreatment area (STA). The site is subject to high seasonal groundwater. Groundwater was monitored in the test pits throughout the summer and fall of 2021. High seasonal groundwater was oþserved in June at an approximate elevation of 6204' . For purposes of the OWTS design, we are estimating groundwater at 6205'. The property has an approximate 2 to 3% slope to the northwest toward the Roaring Fork River. The proposed soil treatment area (STA) will be located at approximate native grade of 6208' to 6209'. 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 March 30,2021 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 medium brown topsoil to 1.5-feet, underlain by light brown sandy loam with cobbles to a maximum depth explored of 7.0-feet. No bedrock or groundwater was encountered. The materials encountered in Test Pit #2 consisted of medium brown topsoil to 1.S-feet, underlain by light brown sandy loam with cobbles to a maximum depth explored of 6.0-feet. No bedrock or groundwater was encountered. Piezometers were placed in the test pits and monitored throughout the summer and early fall2021. Results of this monitoring are documented in an enclosed documented titled Groundwater Monitoring Results. We have estimated high seasonal groundwater at 6205'. A sample of the soils was taken from Test Pit #1 at 3-feet below grade. The soil formed a ball and a weak ribbon less than 1-inch in length before breaking. Soilstructure shape was single-grain. Soil texture was gritty. STA sizing is based on Soil Type 2, Sandy Loam with rock content exceeding 65%. The proposed STA will be partially mounded with a minimum 3-feet of sand filter material (Secondary Sand). A long term acceptance rate (LTAR) of 0.8 gallons per square foot will be used to design the OWTS. Test Pit View of Test Pit #1 I Carla Ostberg holds a Certifìcate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 3 Sieved sample View of Test Pit #2 Page 4 DESIGN SPECIFICATIONS Desiqn Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 150 GPD (4th and 5th Bedrooms) = 600 GPD LTAR = 0.8 GPD/SF 600 GPD / 0.8 GPD/SF = 750 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 6209' has been established as 100' (Finished Floor of the Main Residence). 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. 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 will include a 2000-gallon, two-compartment Valley Precast concrete septic tank with an Orenco@ Biotube Pump Vault and an Orenco@ PF3005 pump in the second compartment of the septic tank. We recommend anchoring the septic tank with Deadmen because of the high seasonal groundwater table. The floats should be set to dose approximately 65 gallons each pump cycle, allowing approximately 10.5 gallons of drain back. The control panel for the pump must be located within line of sight of the septic tank. We recommend Valley Precast out of Buena Vista be contracted for start-up of the pumping system. Pum Table OWTS Component Minimum Elevation Primary Tank lnlet lnvert (6205' 6") Approximate horizontal distance 15' / min.2o/o fall to septic tank / min. 3.75" fall Automatic Distributing Valve (ADV)(Approx. 6210') Approximate horizontal distance 99' / min. 1% rise to ADV / min. 12.375" rise lnfiltrative Surface Approximate horizontal distance to furthest zone 7' / min. 1% fall I min. 0.875" fall Min. 38.5 gal. (7 gal x 4) + 10.5 oal drain back Dose Range Max = 160 gal. (600 GPD x25% + 10.5 oal drain back) 65 gallons/dose 10.5 gallons drain back (99' / 1 .5" diameter pump line) Dose Setting 2000 gallon 2-compartmet Valley Precast concrete septic tank 4.5" onloff float separationFloat Separation Pump Criteria 20.3 gallons per minute (GPM)20.0 feet total dynamic head (TDH) Page 5 Effluent will be pressure dosed through a 1.5-inch diameter pump line to a partially mounded, unlined sand filter. The sand filter will be divided into two beds, each 12' x31.5' with some room between beds for plumbing for a total approximate length of 65-feet. The excavation for the sand filter will begin 2.O-foot below native grade (6206'). A minimum of 3-feet of sand filter material will be installed in the over-excavated footprint, resulting in 1-foot of sand filter material extending above native grade. 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 provided. Effluent will be pumped through a 1.5-inch diameter pump line from the pump chamber to an Orenco@ automatic distributing valve (ADV), model 6404. This pump line must have a minimum 1o/o grade for proper drain back into the tank after each pump cycle. This pump line will cross a driveway. We recommend a minimum Schedule 40 conduit. The ADV must be placed at a high point of each zone and be placed in an insulated riser with access from grade. Screened rock must be placed below the ADV to support the ADV and to assure the clear pipes exiting the ADV remain visible for future inspection and maintenance. Level, 1.5-inch diameter manifolds will connect two laterals on each bed (see W3.0/1 Partially Mounded Sand Filter Plan). Laterals must be 1.5-inches in diameter with 5/32-inch diameter orifices facing down, spaced 2-feeton center, installed on the GeoMatrM with the filter fabric over the laterals. Laterals should be placed 2-feet from the edges of the beds leaving 3-feet between laterals and 2-feet between each section connected by the ADV. Four 39" wide GeoMatrM must be placed on the 12-footwide bed. Mats will overlap the sides of the bed by 6-inches on each side. All material associated with the GeoMatrM installation must be proprietary products associated with the GeoMatrM, including orifice shields and geotextile fabric. Manufacturer instructions must be followed regarding installation of the GeoMatrM. Each 1.S-inch diameter lateral must end in a sweeping ellfacing up with a ballvalve for flushing. Laterals must be covered by the GeoMatrM separation fabric and at least 1-foot of topsoil or other suitable soil able to support vegetative growth. There shall be no cobble-sized (2.5") or greater rock in final cover over the GeoMatrM. lnspection ports must be placed into the sand filter materialon each corner of the beds. The mound must have a minimum 3:1 slope (horizontal;vertical); therefore, the basal area will extend approximately 9-feet beyond the sand filter on all sides (with a mound height of approximately 3.O-feet above native grade). Soils in the sloped perimeter areas of the mound must be well draining and able to support vegetative growth. This soil must be approved by this office prior to installation. The mound must be crowned in a manner to promote drainage off the STA. 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 Valley Precast Item # 2000T-2CP-HH 2-compartment concrete septic tank with high read pump Tank Deadmen Valley Precast Item # DM Anti-Buoyancy Pump Orenco@ PF300511y2HP 120 Volt Biotube ProPak Pump Packaoe Orenco@ BPP3ODD Vault, Filter, Control Panel (demand dose) Page 6 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. I NSTALLATION 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. REVEG ETATION 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. Tank Risers and Lids Orenco@ Double-walled PVC Risers and Lids (24" diameteQ ADV Orenco@ v64044 1.5" lnlet and Outlets ADV Riser and Lid Orenco@ Double-walled PVC Risers and Lids (30" diameter) GeoMatrM GeoMatrix Systems, LLC 252,GeoMa1rn,t (39,,) Orifice Shields 112 total Flushing Assembly Orenco@ 1.5" dtameter two 45" or 90" long sweep only (8 total) Page 7 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 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 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.Reviewed By 38823 'u',i. 3-28-2022 : L I foo (læ',ü* Ltstfu"t Carla Ostberg, MPH, REHS Romeo A. Baylosis, PE Pump Selection for a Pressurized System - Single Family Residence Project Fadden / Lot 9, Roaring Fork Preserve Parameters 300Discharge Assembly Size Transport Length Before Valve Transport Pipe Class Transport Line S¡ze Distributing Valve Model Transport Length After Valve Transport Pipe Class Transport Pipe Size Max Elevation Lift Manifold Length Manifold Pipe Class Manifold Pipe Size Number of Laterals per Cell Lateral Length Lateral Pipe Class Lateral P¡pe Size Orifice Size Orif¡ce Spacing Residual Head Flow Meter 'Add-on' Friction Losses Galculations 1.25 99 40 1.50 6404 7 40 1,50 5 ù 40 1.50 I 29.25 40 1.50 5t32 2 None feet inches inches feet inches feet feet inches feet ìnches inches feet feet inches feet ooll Io d a!oT .9 Êt!E o Ë P 250 200 150 100 50 PumpData 5 10 15 20 25 Net Discharge (Spm) 30 35 40 Minimum Fiow Rate per Orif¡ce Number of Orifices per Zone Total Flow Rate per Zone Number of Laterals per Zone % Flow D¡fferential l svlast Orifice Transport Velocrty Before Valve ïransport Velocity After Valve Frictional Head Losses 0.68 30 20.3 2 0.7 o.¿ ea gpm gpm o/o fps fps 00 feet feet feet feet feet feet feet feet gals gals gals gals gals gals Loss through D¡scharge Loss in Transport Before Valve Loss through Valve Loss in Transport after Valve Loss in Manifold Loss in Laterals Loss through Flowmeter Add-on' Friction Losses Pipe Volumes 2.9 2.5 4.3 0.2 0.0 0.1 U.U U.U Vol of Transport Line Before Valve Vol of Transport L¡ne After Valve Vol of Manifold Vol of Laterals per Zone Total Vol Before Valve Total VolAfter Valve 'qu¡rements 20.3 20.0 10.5 0.7 U.J 6.2 10.5 7.2 PF3005 High Head Effluent Pump 30 GPM, 1/2HP 1151230V 1Ø 6OHz,200V 3Ø 6OHz PF3007 High Head Effluent Pump 30 GPM, 3/4HP 23OV 1Ø 60H2, 200/460V 3Ø 60Hz PF3010 High Head Effluent Pump 30 GPM, IHP 23OV 1Ø 60H2, 200/460V 3Ø 6OHz PF3015 High Head Effluent Pump 30 GPM, 1-1l2HP 230V 1Ø 60Hz,2OOl230l460V 3Ø 60Hz gpm sY$lrMs@ System Curve: - Pump Curve: ' ' Pump Optimal Range:- Operating Point: Design Point: G o feet G)qPublb.net* Garfield County, Co O WEEPING WILLOW LN CARBONDALE FADDEN, MATTHEW SCOTT & J ULIE ANNE 2815 W 115TH DRIVE DENVER CO 80234 81623 2019Total Actual Value Overview Legend f, Parcels Roads Parcel/Account Numbers Highways =* Limited Access - Highway Major Road ' Local Road Minor Road Other Road RamP -- Ferry Pedestrian Way Owner Name i,.:l takes c Rivers * County Boundary Line $11,840 Last25ales Date Price 7t/r9/202} $O e/ts/2020 $o Account Number Parcel Number Acres Land SqFt Tax Area 20t9MiI Levy R0085ó1 239336319009 15 0 011 79.7760 Physical Address Owner Address Date created:3/I7/2O22 Last Data Uploaded: 3/I7 /2O22 2:24:37 AM Deve rone d bv¡$:) *t.gFidçt 3117122, 12:26 PM Account Parcel Property Address legal Description Acres Land SqFt TexArea M¡llt€vy Subdivislon qPublic.net - Garfield County, CO - Property Record Card: R008561 G)qPublic.net'" Garfi eld County, co Summary R0085ó1 23933ó319009 OWEEPING WILLOW LN, CARBONDALE, CO 81ó23 Section: 3ó Township: 7 Range:88 Subdivision: ROARING FORK PRESERVE Lot: 9 AS PER FIRSTAMENDED PLAT RECEPTION NO. 945740 15.412 ACERS t5.4tt 0 t1- 79.7760 ROARING FORK PRESERVE View MaB Owner FADDEN, MATTHEW SCOTT & JULIE ANNE 2815 W 115TH DRIVE DENVER CO 80234 Land Unit Type IRRIGATED LAND-AGRICLTRL. - 4117 (AGRICULTURAL PROPERTY) SquareFeet 0 Actual Values Assessed Year Land Actual I mprovementActual Total Actual AssessedValues Assessed Year Land Assessed I mprovement Assessed Total Assessed Tax History TexYear Taxes Billed 2020 $263.64 2079 s26s.96 202L $11,840.00 $11,840.00 202! $3,430.0O $o.oo $3,430.(x) 20LA $363.76 2O:2O $12,040.00 $o.oo $12,040.00 2020 $3,490.00 $o.oo $3,490.00 2017 $347.72 Sale Price $o.oo 2027 $273.64 Click here to view the tax information for th¡s p Transfers Sale Dete 77/19/2]020 9/75/2020 9/75/2020 9/LO/2020 8/20/2020 2/26/2015 72/75/2014 70/6/2013 3/9/2006 3/A/2006 77/8/2004 5/29/2002 5/23/2002 5/20/2002 Reception Number 945740 94t985 94198? 94L994 94tO.7t 859785 e?7ote 941696 694032 494031 663586 604723 ó03998 603997 Book - Page 1780-62 7780-67 1640-292 1360-465 1357-225 7357-213 Deed Type Plat BARGAIN AND SALE DEED STATEMENTOFAUTHORITY SPECIALWARRANTY DEED CoRRECTTON QUITCLAIM LIS PENDENS QUITCLAIM DEED NOTICE OF LIS PENDENS WARRANTY DEED STATEMENTOFAUTHORITY QUITCLAIM DEED WARRANTY DEED DECLARATION AGREEMENT $o $o $o $780,000 $5ó5,000 $o $o $o $o $o $o $o $o $o https://qpublic.schneidêrcorp.com/Application.aspx?ApplD='t038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=126012332&KeyValue=R008561 112 3117122, 12t26 PM qPublic.net - Garfield County, CO - Property Record Card: R008561 s/8/2002 9/L4/200I 8/20/2Wt 8/15/2001 5/3u2æt 4/20/2000 5/27/t999 r2/3O/t:998 12/3O/1e?8 4tgotL987 4t20/1987 4/6/7962 ó03999 ó03P95 586745 @e 69y 6 sç?3?1 546792 fiq!2q 138724 18\2e7 398e8? 2177r2 7357-269 7357-209 7279-57 7357--2L7 1359-I28 IL83-436-439 !L3t-757 7LO7-Ot70 7to7-01"66 0710-05ó8 0709-o947 0340-0327 $7,776,000 QUITCLAIM DEED EASEMENT RESOLUTION QUIJclÁtM DFED DECLARATION GENERALWARRANTY DEED AFFIDAVIT QUITCTAIM DEED QUITCLAIM DEED coRRECTTON QUtTCLAtM QUITCTAIM DEED WARRANW DEED $o $o $o $o $o $o $o $o $o $o $o Propefi Related Public Documents Click here to view Prop4yjg!3!9d.gCþ!¡C_DocumeDlg Photos No dåta eva¡lable forthefollowlng modules: Buildings, Sketches. ::;:iriili- blr gr:at;:l'iÈi:e,ì. llserfriy"asy-!.ql¡çY -9PPÂf-riv"ævJe!¡ss La9!84þ_Uplqa43¿!ZZW&:24¿31-.M Y<:r:;k:r;!."j:i7't l -:er.¡ci¡¡¡lii i:t). l-)Fsþr',"rdçr https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q='126012332&KeyValue=R008561 212