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Home My WebLink AboutOWTS Design 03.31.2022129 Cains Lane Carbondale, CO 81623 970.309.5259 carla.ostberg@gmail.com March 31, 2022 Project No. C1707 Matt Petrak Gould Construction mpetrak@gouldconstruction.com Subsurface Investigation and Onsite Wastewater Treatment System Design 3-Bedroom Residence 49893 Hwy 6 & 24 Garfield County, Colorado Matt, CBO Inc. completed an onsite wastewater treatment system (OWTS) septic tank replacement design for the subject residence. The 14.47-acre property is located outside of Glenwood Springs, in an area where OWTSs and wells are necessary. Legal Description: Section: 1 Township: 6 Range: 90 A PARCEL IN THE S2NE4 AND IN LOT 1 LYING NLY OF THE NLY ROW LINE OF I-70 CONT. 14.47 AC. AKA PARCEL B DEVER EXEMPTION. Parcel ID: 2183-011-00-070 SITE CONDITIONS A 3-bedroom modular residence previously existed on the property. A new, 3-bedroom modular home is proposed in the same approximate location as the previous residence. The residence was served by an existing OWTS. The subject OWTS consists of one 1000-gallon, two- compartment concrete septic tank followed three gravelless chamber trenches, each with 11 ‘Quick 4’ Infiltrator® chambers in a serial configuration for a total of 33 ‘Quick 4’ Infiltrator® chambers and 396 square feet of infiltrative area. The system was sized to accommodate 3-bedrooms. Garfield County Permit SEPT-4-10-1516 documents the system and was issued on April 21, 2010. The component locations on the original design are different than the actual installation; however, no as-built or record drawing was available. We visited the property on March 25, 2022. We found the existing septic tank to be farther to the south than represented on the design. Two pieces of plywood covered the septic tank, which was in disrepair and must be replaced. The residence will be served potable water from a well on the property. The well must be located at least 50-feet from the proposed septic tank. The existing sewer line is represented on the design as meeting a 25-foot setback from the well. Current code requires a setback of 50-feet; however, we assume the existing sewer line may remain with no proposed changes to that portion of the OWTS and the fact that the sewer line was previously approved in that location. Inspection ports were visible in the existing soil treatment area (STA). The existing STA will remain in use. Page 2 A Google Earth image was utilized to create the site plan with approximated component locations. The site plan is not the result of a survey. Clean out near house location existing STA Septic tank covered with plywood – tank lid in disrepair Page 3 DESIGN SPECIFICATIONS We recommend a camera be run through the sewer line from the existing clean out near the proposed residence to verify location, depth, and condition of the sewer line. The existing septic tank must be pumped, and the top, bottom, and sides crushed and remaining void filled with onsite material, or removed. A new, Infiltrator® (minimum) 1000-gallon poly two-compartment septic tank with an Orenco Biotube Effluent filter on the outlet tee must be installed. Other state-approved poly or concrete septic tanks may be substituted, depending on availability, and the size may be increased to 1500-gallons. Risers must bring the manhole lids to grade. We recommend Orenco® risers and lids. If more than 1-foot of risers are installed, a handle extension must be added to the effluent filter. For the purposes of this OWTS design, Benchmark Elevation has been established as 100’ as the existing sewer line exiting the residence. Elevation of the septic tank placement must align with the existing sewer line exiting the residence and the existing sewer line to the STA. CBO Inc. should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. Garfield County documents indicate the STA is connected serially, with no distribution box. We recommend exploring the sewer line from the new septic tank to the STA to assure it’s in good condition. This can be done with a camera, or water can be run from the new septic tank to the STA with a garden hose for 10+ minutes to assure the STA is accepting water. 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-10600-2CP 1000-gallon, 2- compartment poly septic tank (concrete can be substituted and the size can be increased up to 1500-gallons) Tank Risers and Lids Orenco® Double-walled PVC Risers and Lids (24” diameter) Effluent Filter Orenco® Full size effluent filter Construction must be according to Garfield County On-Site Wastewater Treatment System Regulations, the OWTS Permit provided by Garfield County Environmental Health Department, and this design. Page 4 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. 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. Page 5 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. Carla Ostberg, MPH, REHS Garfield County Building & Planning Department 108 Sth Street Suite 401 Glenwood Springs, CO 81601 - Phone: {970}945.8212 Fax- (970)384-3470 Project Address Parcel No. 218301100070 GLENWOOD SPRINGS, CO Subdivision Permit NO. SEPT -4-10-1516 Permit Type: Septic Permit Work Classir5ca6on. New Permit Status: Active Issue Date: 412112010 Expires: 04/2112011 Section Township Ranc Owner Information Address Phone Cell Richard Dever PO Box 638 970-618-2670 Glenwood Springs CO 81602 ractor(s) Phone Primary Contractor Proposed Construction I Details FEES DUE Fee Amount Septic Fee - New $73.00 Total: $73.00 Wednesday, April 21, 2010 Required Inspections: For Inspections call: 1(970)384-5003 Inspection IVR Valuation: $ 0.00 Total Sq f=eet: 0 S PAID Inv Total Paytype Amt Paid Amt Due Inv # SEPT -410-20156 S73.00 Check # 2119 S73,00 0.00 See Permit Record Building Department Copy GARFMLD COUNTY SEPTIC PERMIT APFUCATiON I OR Ss' Str tet Suite dal, Gt=wood Springs, Co 51607 Phone: 970-945-9212 / Fax: 970-384-3470 /InTeetion Linc: 970-384-5003 www. ar•8cld-count .crm I Panel No: (thisbiran alon la ala at ft ape mcop. a olfm M45.9131) Z W Addre®s rums nal been aaiprrad plaaaa pwvide G>HwY Q 6 C1h+1F j rlplar 3 tat 3ma / Ldt Na Na - dE- 1 r.rI Tan: d OW-- W=Paar a mor) Map rh Addraaa z Plr Ai! 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FINAL Dl KP M OY: ADeorpddn trhtncl% Bed orPR PON GmmW lhap¢,sel i )E+rapotrWWaRlion ( )Send liri )Wo wxe r pm+d ( )Ohre, De crilm Win effluent irrh alecMuned dkectly Onto wmre of thrr eh *A7 r WFA r 16 PERCOIXTON TEST RESULT: no be e9nmtahed Proreaionnr t rgmer. arms $npnmr dae4 6" P2m4am T804 ISnubm winch in hda Nal Mnubw, , _—perInch in hde No.3 ldinutm perimh in hole N,%2 nutas p fi tr in hole NoName, address & mlepnone of RPE OMa mope sag eDeolptlon tea Name, address & telephone O RPE responsible for design of lihe geterm 17 Apptiaahtadcrrorwodpoo thottro cgmplos of die appfaae9an la randNl el rrparh earth fhettter the local haft deperbnod to he mem mrd denkhad by the appOewh ar by the Wd heallh rlywwd for urp 5opd test m reports as may 6 raquirad b depatnanr forpuepseod afthe aMarrm5en oFthe nPF cn: and tiro nvm ce dFVM OMM is su*d to such farms end condiliane ae downed necessary to ithstna cmffis ea Wth nrias aret repuletians made, inkimuSon end reports wbm d henivi h And maq*W to be wbmMed by the aWcent are orvA be mprasertted to be true and carfeet t6 the best of my lmoededge amd befrefandamdesignedtobemkdtanbytheloeeldeparonentoftmWthineveluefingthecanfardiesedngthepern:ot eppFmd for harm, I raeew understand trot arty fetslkvkm ar ffftq meeme6da mer easult in t u dersal of um appffe mn or rasacedon ar ay pemm grenem based upon em appbcelonandlegalmficeforpartprvuidedbylaw 0,21 s. 20 D H11PO Box 2844 j Glenwood 5pdngs,C081602 Ph Fax 3033-216-2796 May 17. 2010 Ted Hutchinson PO Box 2711 Glenwood Springs, CO 81642 Installation Observations 49897 Highway 6 and 24 Garfield County, Colorado Ted, Project No. 1668 ALL SERVICE septic, LLC performed an installation observation of the septic system on April 28"' 2010 for the subject property. The installation included a I000 -gallon, two-compartment concrete septic tank with an effluent filter. The drain Feld consisted of three chamber trenches, with each trench having I I `Quick -4' chambers, equaling a total of 33 chambers, and a total area of 326 SF. Serial distribution was used to distribute effluent. The OWS was generally installed according to specifications. This observation is not a guarantee of workmanship and/or parts and materials. ALL SERVICE septic, LLC should be notified if changes are made to the OWS. LIMITS: The observations were based on information submitted. If conditions are different from conditions described in this letter, ALL SERVICE septic, LLC should be notified. All additional OWS construction must be according to the county regulations. The installer should have documented and demonstrated knowledge of the requirements and regulations of the county in which they are working. Please call with questions. MDQ Lie =, Sincerely, ti SOF ,ti ALL ICE ptic, LLC Reviewe VY Ei 38662: Timothy . Petz Richard H. Pe jONALE 2 copies sent Copy sent to Garfield County May 17, 2010 Project No. 1700 Ted Hutchinson PO Box 2711 Glenwood Springs, CO 81602 Installation Observations 49897 Highway 6 and 24 Garfield County, Colorado Ted, ALL SERVICE septic, LLC performed an installation observation of the septic system on April 28th 2010 for the subject property. The installation included a 1000-gallon, two-compartment concrete septic tank with an effluent filter. The drain field consisted of three chamber trenches, with each trench having 11 ‘Quick-4’ chambers, equaling a total of 33 chambers, and a total area of 326 SF. Serial distribution was used to distribute effluent. The OWS was generally installed according to specifications. This observation is not a guarantee of workmanship and/or parts and materials. ALL SERVICE septic, LLC should be notified if changes are made to the OWS. LIMITS: The observations were based on information submitted. If conditions are different from conditions described in this letter, ALL SERVICE septic, LLC should be notified. All additional OWS construction must be according to the county regulations. The installer should have documented and demonstrated knowledge of the requirements and regulations of the county in which they are working. Please call with questions. Sincerely, ALL SERVICE septic, LLC Reviewed By: Timothy R. Petz Richard H. Petz, P.E. 2 copies sent Copy sent to Garfield County November 29th 2009 Project No. 1668 Ted Hutchison PO Box 2711 Glenwood Springs, CO 81602 Subsurface Investigation and Onsite Wastewater System Design, 3-Bedroom Residence 49897 Highway 6 and 24 Garfield County, Colorado Ted, ALL SERVICE septic, LLC performed a subsurface investigation and an onsite wastewater system (OWS) design for the subject residence. The property is located outside of West Glenwood, in an area where OWS and wells are necessary. SITE CONDITIONS The subject lot is presently vacant. A 3-bedroom residence is proposed as indicated on Figure 1. The proposed drain field area lies to the southwest of the proposed residence. The area of the proposed drain field has sparse large rocks that have toppled from cliffs above, and the vegetation consists of a moderate cover of native grasses. Water will be served to the residence via an onsite well. SUBSURFACE The subsurface was investigated by digging one profile pit and three percolation holes, as indicated. The materials encountered in the profile pit consisted of a 1-foot sandy root zone, underlain by clayey sand with scattered angular rocks to the maximum depth explored of 7 feet. Groundwater or bedrock was not encountered. Three percolation holes were dug, in the area of the proposed drain field, as indicated. Percolation rates ranged from 10 to 14 minutes per inch (MPI). A 13 MPI rate will be used to design the OWS. DESIGN SPECIFICATIONS The OWS design is based on 3-bedroom and an average sewage load of 450 GPD. The installation must include a 1000-gallon, two-compartment, precast concrete septic tank, with an effluent filter on the outlet, followed by 3 gravelless trenches. Each trench must have 11 ‘Quick-4’ chambers, for a total of 33 chambers, equaling 326 SF of infiltrative area. Serial distribution may be used to distribute effluent. Onsite Wastewater System Page 2 Construction must be according to the Garfield County Health Department OWS regulations, the OWS Construction Permit provided by the county, and this design. OPERATION INFORMATION AND MAINTENANCE The surface of the drain field should be seeded upon completion. Vegetation is an important factor in drain field performance. Erosion control should be practiced prior to and during re-vegetation. Geo- fabrics or plastics should not be used over the drain field. No heavy equipment, machinery, or materials should be placed on backfilled drain field. Livestock should not graze on the drain field. Plumbing fixtures should be checked to ensure that no additional water is being discharged to OWS. For Example, a running toilet or leaky faucet can discharge hundreds of gallons of water a day and harm a drain field. The homeowner should pump the septic tank every two years and clean the effluent filter as needed. Garbage disposal use should be minimized, and non-biodegradable materials should not be placed into the OWS. Grease should not be placed in household drains. Loading from a water softener should not be discharged into the OWS. No hazardous wastes should be directed into the OWS. Mechanical room drains should not discharge into the OWS. The OWS is engineered for domestic waste only. ADDITIONAL CONSTRUCTION NOTES If design includes a pump, air release valves and weep holes should be installed to allow pump lines to drain to minimize risk of freezing. Excavation equipment must not drive in excavation of drain field due to the potential to compact soil. Extensions should be placed on all septic tank components to allow access to them from existing grade. Precast concrete tanks and distribution boxes should be used, unless plastic or fiberglass is required. Access to all tank compartments and distribution devices is optimal. INSTALLATION OBSERVATIONS ALL SERVICE septic, LLC, and the county must view the OWS during construction. The OWS observation should be performed before backfill, after placement of chambers and distribution pipes. Septic tanks, distribution devices, pumps, dosing siphons, and other plumbing, as applicable, must also be observed. ALL SERVICE septic, LLC should be notified 48 hours in advance to observe the installation. Onsite Wastewater System Page 3 LIMITS: The design is based on information submitted. If soil conditions encountered are different from conditions described in report, ALL SERVICE septic, LLC should be notified. All OWS construction must be according to the county regulations. Requirements not specified in this report must follow county regulations. The installer should have documented and demonstrated knowledge of the requirements and regulations of the county in which they are working. Please call with questions. Sincerely, ALL SERVICE septic, LLC Reviewed By: Timothy R. Petz Richard H. Petz, P.E. 3 copies 49893 Hwy 6 & 24 Legend 100 ft N➤➤N