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Home My WebLink AboutOWTS DesignI29 CnIrus LANE CARBoNDALE, CO 81623 970.309.5259 cenLn. osreERG@c r\4er t. c o r\4 RECEIVED JUN il 7 ?02? GARFIELD COUNTY COMMUNITY DEVELOPMENf strt>'t' r (: ( :ol\stl Ir,'l' r i\ (; May 8,2022 Project No. C1718 Riley Soderquist rilev@looep oerties.com c/o Kevin Michaelson kevi n@peakvisions. net Subsurface lnvestigation and Onsite Wastewater Treatment System Design 4-Bedroom Residence 130 Flying Fish Road Garfield County, Colorado Riley, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 5.67-acre property is located outside of Carbondale, in an area where OWTSs and wells are necessary. Legal Description: Section: 32 Township: 7 Range: 87 TR lN LOTS I & 18 5.67 ACRES Parcel lD: 239132100013 SITE CONDITIONS A 3-bedroom, single-family residence presently exists. The residence is served by an existing OWTS. The subject OWTS consists of one 1500-gallon, two-compartment concrete septic tank followed by a soil treatment area (STA) comprised of an Evapotranspirationl (ET) Bed. lndividual Sewage Disposal System (ISDS) Permit 2522 documents replacement of the septic tank. The permit received final approval on November 20, 1995. The ET Bed is likely original to the construction of the house, which his noted on the Garfield County Assessor's Website as 1977. There is no information on the ET bed with respect to size or location. ISDS Permil2522 notes the system was sized to accommodate a 3- bedroom residence; however, the septic tank is large enough to serve up to 5 bedrooms. The OWTS was inspected in January 2021 and the STA showed signs of saturation and failure. The residence will undergo a remodel that will result in 4 total bedrooms. The existing OWTS will be abandoned and replaced with the system outlined in this design. The residence will be served by the existing well on the property. The well is located to the north of the residence. The well is greater than 5O-feet from the proposed septic tank and sewer lines and greater than 1OO{eet from the proposed STA. The proposed mounded STA is located to the north of the residence. The mounded STA will be built into an existing berm. 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. 1 An Evapotranspiration Bed typically has a liner under the infiltrative area and relies solely on evapotranspiration of wastewater through the vegetation and grasses. Page2 SUBSURFACE The subsurface was investigated on Apr¡l 29i 2022 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.2 The materials encountered in Test Pit #l consisted of dark brown moist, organic topsoil to 2.O-feet, underlain by gray, very moist sand and cobbles to a maximum depth explored of 4.O-feet where grou ndwater was encountered. The materials encountered in Test Pit #2 consisted of dark brown moist, organic topsoil to 3.O-feet, underlain by gray, very moist sand and cobbles to a maximum depth explored of 4.O-feet where grou ndwater was encountered. A sample of the topsoil was taken from Test Pit #1 at 2-feet below grade. Topsoil structure was moderate. The soilformed a ball and a ribbon approximately 1-inch in length before breaking. Soil structure shape was blocky and consistence was friable. Soiltexture was both gritty and smooth. Topsoil is classified as Soil Type 2, Loam with moderate structure grade. Soils below topsoil are classified as Soil Type R-0. High seasonal groundwater is estimated at 1.0-foot below grade ín the area of the proposed STA. The proposed STA is a mounded, pressure-dosed sand filter beginning 1.O-foot below native grade. The mounded sand filter will consist of 3-feet of Secondary Sand. A long term acceptance rate (LTAR) of 0.8 gallons per square foot will be used to design the OWTS. Test Pit #1 2 Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 3 Sand and cobbles below 2-feet Groundwater encountered at 4-feet Test Pit #2 Page 4 Topsoilto 3-feet Groundwater encountered at 4-feet --.r ,. r-li>Lq t Topsoil/ ribbon approx. 1-inch (loam) DESIGN SPECIFICATIONS The existing septic tank will be abandoned by pumping the tank and removing it or crushing the top, bottom, and sides and filling in the void with onsite materials. The existing STA will be abandoned in place. Desion Calculations: AverageDesignFlow=T5GPDx2people/bedroornx3Bedrooms+75GPD1+tnBedroom)=525GPD LTAR = 0.8 GPD/SI- 525 GPD / 0.8 GPD/SF = 656.25 SF Page 5 The new OWTS design is based on 4-bedrooms. An average daily wastewater flow of 525 GPD will be used. For the purposes of this OWTS design, Benchmark Elevation at grade 6335' has been established as 100' (Finished Floor). CBO lnc. should be notified of any discrepancies or problems with grade elevations of proposed components dur¡ng installation of the OWÏS. *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 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 1500-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 85 gallons each pump cycle, allowing approximately 22.5 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 Effluent will be pressure dosed through a 1.5-inch diameter pump line to a mounded, unlined sand filter. The sand filter will be divided into two beds, each 7' x 47'with some room between beds for plumbing for a total approximate length of 96-feet. The excavation for the sand filter will begin 1.O-foot below native grade. A minimum of 3-feet of sand filter material will be installed in the over-excavated footprint, resulting in 2-feet 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 6402. This pump line must have a minimum 1o/o grade for proper OWTS Component Minimum Elevation Primary Tank lnlet lnvert Approximate horizontal distance 9' / min. 2% fall I min. 2.25" fall / PLACEMENT OF INVERT TO ACHIEVE PROPER RISE TO STA 633I.5' Automatic Distributing Valve Approximate horizontal distance 214' lmin. 1% rise / min. 26.75" rise lnfiltrative Surface Approximate horizontal distance 5' / min. 1% fall to STA i min. 0.625" fa|| Dose Range Max = 153.75 gal. (525 GPD x 25o/o + 22.5 drain back) Min. 64.5 gal. (10.5 gal x 4) + 22.5 oal drain back Dose Setting 85 gallons/dose 22.5 gallons drain back (214' I 1.5" diameter pump line) Float Separation 1500 gallon 2-compartment Valley Precast concrete septic tank 8.5" on/otf float separation Pump Criteria 21.7 gallons per minute (GPM)23.9 feet total dynamic head ffDH) Page 6 drain back into the tank after each pump cycle. The ADV must be placed at a high point 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.S-inch diameter manifolds will connect two laterals in each bed (see W3.0/1 Mounded Sand Filter Plan). Laterals must be 1.S-inches in diameter with 5/32-inch diameter orifices facing down, spaced 3'0- feet on center, installed on the GeoMatrM with the filter fabric over the laterals. Laterals should be placed 2- feet from the edges of the bed leaving 3' between laterals. Two 39" wide GeoMatrM sheets must be placed on the 7-foot wide bed. All material associated with the GeoMatrM installation must be proprietary products associated with the GeoMatrM, including orifice shields and geotextíle fabric. Manufacturer instructions must be followed regarding installation of the GeoMatrM. Each 1.5-inch diameter lateral must end in a sweeping ell facing up with a ball valve for flushing. Laterals must be covered by the gray GeomatrM soil 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 material on each corner of the beds. The mound must have a minimum 3:1 slope (horizontal:vertical); therefore, the basal area to the south, east, and west will extend approximately 9-feet beyond the sand filter (with a mound height of approximately 3-feet above native grade). The mound will be built into the existing berm. Soils in the sloped perimeter areas of the mound must be well draining and able to support vegetative growth (on-site topsoil is suitable). 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. GOMPON ENT SPECIFICATIONS The component manufacturers are typical of applications used by contractors and engineers in this area. GBO 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 MANUFAGTURER MODEL NO.COMMENTS Septic Tank Valley Precast tem # 1500T-2CP-HH 1500-9allon, 2- compartment concrete septic tank with high head oump Tank Deadmen Valley Precast Item # DM Anti-Buoyancy Pump Orenco@ PF3005111%HP 120 Volt Biotube ProPak Pump Packaoe Orenco(Ð BPP3ODD Vault, Filter, Control Panel ldemand dose) Tank Risers and Lids Orenco@ Double-walled PVC Risers and Lids (24" diameter) ADV Orenco@ v64024 1.5" lnlet and Outlets ADV Riser and Lid Orenco@ Double-walled PVC Risers and Lids (30" diameter) GeoMatrM GeoMatrix Systems, LLC 188' GeoMalru (39") Orifice Shields 56 total Flushing Assembly Orenco@ 1.5" diameter two 45" or 90' long sweep only (4 total) PageT 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 additionalconditions 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 OBSERVAT¡ONS 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 paôt<et. Photographs of the installation and final cover are also requested to supplement our installation documentation. REVEGETATION REQU I REM ENTS An adequate layer of good quality topsoil capable of supporling 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. 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 Page 8 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 coñtractor 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: (.€rj'b tstúÅr',6 Carla Ostberg, MPH, REHS Romeo A. Baylosis, PE I L' tl. ilÌr{ 5-31 38å23 -2022 a Pump Selection for a Pressurized System - Single Family Residence Proiect 130 Flying Fish Parameters 300 Discharge Assembly Size Transport Length Before Valve Transport Pipe Class Transport Line Size Distributing Valve Model Transport Length After Valve Transport Pipe Class Transport Pipe Size Max Elevat¡on Lift Man¡fold Length Manifold Pipe Class Manifold Pipe Size Number of Laterals per Cell Lateral Length Lateral Pipe Class Lateral Pipe Size Orifice Size Orifice Spacing Residual Head Flow Meter 'Add-on' Friction Losses Galculations 1.25 214 40 1.50 6402 5 40 1.50 4.5 J 40 1.50 4 45 40 1.50 5t32 â 5 None 0 inches feet inches feet inches feet feet inches feet inches inches feet feet inches feet 200 a)q,lt r c¡ d a!o ! .9 Et! o aú ô 250 150 100 50 PumpData 5 10 15 20 25 Net Discharge (Spm) 30 35 40 Minimum Flow Rate per Orifice Number of Orifices per Zone Total Flow Rate per Zone Number of Laterals per Zone % Flow Differential lsUlast Orifice Transport Velocity Before Valve Transport Velocity After Valve Frictional Head Losses 0.68 ó¿ 21.7 2 1.2 3.4 3.4 gpm gpm o/o fps fps Loss through Discharge 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 3.3 6.2 4.7 0.1 0.0 0.1 0.0 0.0 feet feet feet feet feet feei feet feet 0 0 end Vol of Transport Line Before Valve Vol of Transport Line After Valve Vol of Manifold Vol of Läterals per Zone Total Vol Before Valve Total Vol After Valve 22.6 0.5 0.3 oÃ 22.6 10.4 gals gals gals gals gals gals PF3005 High Head Effluent Pump 30 GPM, 1/2HP 115t230V 1Ø 60Hz,2O0V 3Ø 60Hz PF3007 High Head Effluent Pump 30 GPM, 3/4HP 23OV 1Ø 6OHz,2Q0t460V 3Ø 60Hz PF3010 High Head Effluent Pump 30 GPM, 1HP 230V 1Ø 60H2,200/460V 3Ø 60Hz PF30'15 High Head Effluent Pump 30 GPM, 1-1l2HP 23OV 1Ø 60H2,200123o1460V 3Ø 60Hz irements 21.7 23.9 gpm feet gYST€MS @ t: q s :: x ':'- É : :-,\ k \ f \ n\ System Curve: - Pump Curve: * Pump Optrmal Range: Operating Po¡nt: O o Design Point: 3125122,9:37 AM GDqPublic.nef" Garfield County, CO Summary qPublic.net - Garfield County, CO - Property Record Card: R011390 ffi @p Owner SODERQUISI RILEY & CARROLL, MACKENZIE 414AABC UNITA ASPEN CO 81ó11 Land Unit Type SINGLE FAM.RES.-LAND - 1112 (RESIDENTIAL PROPERTY) Square Feet 0 Buildings Account Parcel PropertyAddress l€gal Descrlptlon Acres Land SqFt TexArea MlllLevy Subdlvlslon Building # Unlts BuildingType Abstract Codes / (Property Typel Archltectural Style Stor¡es Frâme Actual Year Built Gross LlvlngArea Total Heated SqFt Bedrooms Baths Heet¡ng Fuel HeatingType AirCond¡tion¡ng RoofType Roof Cover Actual Values Assêssed Year Land Actual lmprovement Actual Total Actual Assessed Values Assessed Year Land Assessed lmprovement Assessed Total Assessed R011390 239t32LOOOt3 130 FLYING FISH RD, CARBONDALE,CO 4T623 Section: 32 Township: 7 Range:87 TR lN LOTS 9 & 18 S.óTACRES 5.67 0 LL 79.7760 1 1 SFR SINGLE FAM.RES-IMPROVEMTS.1212 (RESIDENTIAL PROPERTY} 1-STORY L WOODFRAME r977 L99A r,998 3 2.5 GAS HOTWATER NONE GABLE ARCHITECTURAL SHINGLES 2021 $525,000.00 $399,730.00 $924,730.OO 2021 $37,5u10.00 $28,s80.00 $66,t20.æ 2020 $450,000.00 $426,820.OO $87ó,820.00 2020 $32,180.00 $30,s20.00 $62,7æ.æ https://qpublic.schne¡dercorp.com/Application.aspx?ApplD=1O38&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=499645502&KeyValue=R011390 113 3125122,9:37 AM Tax History TaxYear Taxes Billed qPublic.net - Garfield County, CO - Property Record Card: R011390 $4,736.24 Click here to view the tãx information for this parcel on the Garfreld Countv Treasurer's website. Transfers 2021: $5,274.80 2020 Reception Number ?1?!29 9594r? 9594.r8 8qq2?,1 qq?,29 sq+e21 584924 2019 $4,778.32 20L8 $4,s42.t6 2017 $4,347.72 Sale PrlceSale Date 7/7/202t 7/7/2021 7/7/202t 9/14/20t5 9/14/20t5 7/23/2út 7/2]3/200r 6/1.6/1997 6/2/1997 6/tl7989 ut/1900 t/t/7900 DeedType Bargain And Sale Deed WARRANWDEED Statement Of Author¡ty Quit Claim Deed Werranty Deed QUIlCLAIM DEED WARRANTYDEED Deeds Deeds Deeds Deeds Deeds Book - Page t277-253 t27L-251 toz2-o832 to22-o829 0755-0271 o498-0692 o490-o746 $782,5æ $s75,000 1,300,000 $o $o $o $ $o $o $o $o $o Property Related Public Documents Click here to view Prooertv Related Public Documents Photos Sketches ffiry https://qpublic.schneidercorp.com/Application.aspx?ApplD=1O38&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=499645502&KeyValue=R011390 213 3125122,9:37 AM qPublic.net - Garfield County, CO - Property Record Card: R01'1390 o FOP 315.0 sf FOP 287-0 sf f6 f¡ I' 6' FOP %7.2st 15' eñt(r) 37', 35' ão-Ë 23', ONE 1998.0 sf The Garfield County Assessor's Office makes every effort to produce the most accurate information possible. No warranties, expressed or implied are provided for the data hereìn. its use or interpretation. Data is subject to constant change and its âccuracy and completeness cannot be guaranteed. Developed by User Privacv Po!!çy GDP,RPrivacylotjqe Last Data Upþacl. 3!2J! 2O2?,.22238 iM Versìon 2.3.181 C)Fsþs'sl{çr https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=499645s02&KeyValue=R011390 313 NEWRADOhP R0l1 558' 239f :32100029, Rofi 390 239f :32100013 R0ll500 239132100028 R011558 239132100029 NEWRADO LP *no^ â%" R112107 2391 32300051 BLM UNITED STATES OFAMERICA 115 ft R083528 246312100951 GDqPublic.ltet* Garfield County, Co 130 FLYING FISH RD CARBONDALE SODERQUIST, RILEY & CARROLL, MACKENZIE 4!4AABC UNITA ASPEN CO 81ó11 81623 2019Total Actual Value Overuiew Legend ! Parcels Roads Parcel/Account Numbers Highways : LimitedAccess - Highway "" MajorRoad --: Local Road '.-- MinorRoad Other Road Ramp -- Ferry Pedestrian Way Owner Name I Lakes&Rivers - CountyBoundary Line $924/30 Last2Sales Date Price 7/7/2027 $O 7/7/2027 sO Account Number Parcel Number Acres Land SqFt TaxArea 2019Mill Levy R011390 239132100013 6 0 o77 79.7760 Physícal Address Owner Address D ate c¡ e ate d: 3 / 25 /2O22 Last Datâ Uploaded: 3/25/2022 4:27:38 AM Deve rooed bv(ì 9="ttg,"""idçf