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Home My WebLink AboutOWTS Design129 CAINS LANE CARBONDALE, CO A1 623 970.309.5259 CARLA.OSTËERG@GMAIL. COM :iItI"!'¡ ( 1 ( :( )¡isil rt-'l' I:'(* July 11 ,2022 Project No. C1673 Maria Ruiz ro,cioru iz2 307@ hotma i l. cqm Subsurface lnvestigation and Onsite Wastewater Treatment System Design 4-Bedroom Residence 2844 Hwy 133 Garfield County, Colorado Maria, CBO lnc. performed a subsurface investigation and completed an onsite wastewatertreatment system (OWTS) design for the subject residence. The 27442-square foot property is located outside of Carbondale, in an area where OWTSs and wells are necessary. Legal Description: Section: 3 Township: B Range: 88 A TR lN LOT 16. FOR FULL LEGAL DESCRIPTION REF. RECEPTION NUMBER 871635. 27422 SQ FT Parcel lD: 2463-034-OO-012 SITE CONDITIONS The property is currently undeveloped. A 4-bedroom, single-family residence is proposed The residence will be served potable water from a private well on the property. The well is located on the north side of the property, greater than SO-feet from the proposed septic tank and greater than 10O-feet from the proposed soil treatment area (STA). A private well serves the adjoining property to the northeast. We have contacted the owner, Jerry Cheney, and he verified that his well is located on the east side of his residence, approximately 15O-feet from the shared property boundary. The adjoining property to the south does not appear to have a well on their property. The proposed soil treatment area (STA) location is in the southeast corner of the property, paralleling the eastern property boundary. The area is relatively flat, sloping slightly to the west toward the Rockford Ditch, which is approximately 2S-feet west of the western property line, and the Roaring Fork River. 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 October 9,2021 by digging three soil profile test pit excavation (Test Pit). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.l Kumar and Associates documents the subsoil study for the foundation in a report dated December 15,2021, ' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page2 Job No. 21-7-740, is enclosed. This report also documents the Test Pits. The materials encountered in the Test Pit #1 consisted of medium brown topsoil to 1.O-feet, underlain by light brown sandy loam and gravels to 2.O-feet, underlain by medium brown clay loam to 6.0-feet, underlain by light brown sandy loam to a maximum depth explored of B.OJeet. No bedrock or g roundwater was encountered. The materials encountered in the Test Pit #2 consisted of medium brown topsoil to 1.O-feet, underlain by light brown sandy loam and gravels to 3.O-feet, underlain by medium brown clay loam to a maximum depth explored of 8.0-feet. No bedrock or groundwater was encountered. The materials encountered in the Test Pit #3 (referred to as Profile Pit in the Kumar report) consisted of medium brown topsoil to 1.O-feet, underlain by medium clay loam to S.0-feet, underlain by light brown sandy loam to a maximum depth explored of S.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 blocky and consistence was friable to firm. Soil texture was both gritty and smooth. An additional sample of the soil was taken from Test Pit #1 at S-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. Soil texture was gritty. STA sizing is based on Soil Type 3, Clay Loam with moderate structure grade. A pressure-dosed, over- excavated, unlined sand filter with a minimum of 2-feet of sand filter material (Secondary Sand) is proposed. A long term acceptance rate (LTAR) of 0.65 gallons per square foot will be used to design the OWTS. Test Pit #1 near foundation Digging Test Pit #1 Page 3 e34 Sieved sample (approx. 3')Ribbon between 1 and 2 inches Sample from deeper in Test Pit #1 Weaker ribbon but still over 1-inch Page 4 Test Pit #3 Page 5 Backfill DESIGN SPECIFICATIONS Design Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 75 GPD (4th Bedroom) = 525 GPD LTAR = 0.65 GPD/SF 525 GPD / 0.65 GPD/SF = 808 SF The 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 6248' has been established as Finished Floor (FF) of the residence (100'). 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 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 150O-gallon, two-compartment concrete septic tank with an Orenco@ Biotube Pump Vault and an Orenco@ PF3005 pump in the second compartment of the septic tank. The floats should be set to dose approximately 70 gallons each pump cycle, allowing approximately 3.5 gallons of drain back after each pump cycle. A pump curve is enclosed. The control panel for the pump OWTS Component Minimum Elevation Primary Tank lnlet lnvert Approximate horizontal distance 13'l min. 2o/o fal I min.3.25" fall Automatic Distributing Valve Approximate horizontal distance 32' I min. 1o/o rise I min.4" rise lnfiltrative Surface Approximate horizontal distance 4' I min. 1% fall I min. .5" fall Page 6 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 pumped through a 1.5-inch diameter pump line to an Orenco@ automatic distributing valve (ADV), model 6402. This pump line must have a minimum 1o/o grade for proper drain back into the tank after each pump cycle. We recommend this sewer line be placed in a larger Schedule 40 conduit if it will be subject to traffic. The pump line should be well bedded in gravels or sand to avoid future bellies in the pump line. 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. Effluent will be pressure dosed through 1.S-inch diameter distribution lines to two zones in a 12'x 67.5' bed. A minimum of 2-feet of sand filter material will be installed in the over-excavated footprint. 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 coefflcient must be 7.0 or less. Material meeting ASTM 33, for concrete sand, with three percent or less flnes passing 200 mesh sieve may be used. A gradation of the sand media must be submitted to this office prior to obtaining the sand. Laterals will be connected with 1.5-inch diameter level manifolds. Laterals used to disperse the effluent must be surrounded by washed coarse screened gravel or crushed stone (minimum 6-inches below and minimum 2-inches above laterals). All of the gravel or stone must pass a 2 /.-inch screen and must be retained on a /o-inch screen. Laterals must be 1.S-inches in diameterwith 5/32-inch diameterorifices facing down, spaced 3-feet on center (OC). We recommend Orenco@ Orifice Shields be installed on the laterals at each oriflce. Laterals will begin 2-feet from the edges of the filter, with 2-feet between the middle laterals and 3- feet between the laterals that are connected with the manifold (see W3.0/1 Sand Filter Plan). Each 1.5-inch diameter lateral must end in a sweeping ell facing up with a ball valve for flushing. A soil separation fabric should be placed over the gravel layer followed by approximately 1-foot of topsoil or other suitable soil able to support vegetative growth. lnspection ports must be placed in each corner of the bed. COMPONENT SPECIFICATIONS The component manufacturers are typical of applications used by contractors and engineers in this area. GBO 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. Dose Range Max = 134.75 gal. (525 GPD x 25o/o + 3.5 qal drain back) Min. 63.5 gal. (15 gal x 4) + 3.5 qaldrain back Dose Setting 70 gallons/dose 3.5 gallons drain back (32' I 1.5" diameter pump line) Float Separation I 500 Valley tank gallon Precast 2-compartment concrete septic 7" onloff float separation Pump Criteria 29.9 gallons per minute (GPM)24.5 feet total dynamic head (TDH) GOMPONENT MANUFACTURER MODEL NO.COMMENTS Septic Tank Valley Precast tem # 1500T-2CP-HH 2-compartment concrete ;eptic tank with high read pump Pump Orenco@ PF300511%HP 120 Volt Page 7 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. INSTALLATION OBSERVATIONS CBO lnc. must view the OWTS during construction. The OWTS observation should be peformed 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 propefi. 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 REQU IREMENTS 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 ¡NFORMATION 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 tslotube ProPak Pump Packaqe Orenco@ tsPP3ODD lVault, Filter, Control Panel lldemand dose) Tank Risers and Lids Orenco@ lDouble-walled PVC Risers and It-ios 1z+" diameter) I ADV Orenco@ v64024 11.5" lnlet and Outlets ADV Rrser and Lrd Qrenco@ lDouble-walled PVC Risers land Lids (30" diameter) Orifice Shields Orenco@ os150 It.S ¡ncn diameter (84 total) Flushing Assembly Orenco(Ð Page 8 construction of the STA for better weight distribution. Livestock should not graze on the STA. Plumbing fTxtures 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 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: (""^{æ tsl-furß Carla Ostberg, MPH, REHS Romeo A. Baylosis, PE '", 7-15-2t22 : L { 388?3 Ë.!1r Pump Selection for a Pressurized System - Singte Famity Residence Project 2844 Hwy 133 Parameters 300Discharge Assembly Size Transport Length Before Valve Transport Pipe Class Transport Line Size Dishibuting Valve Model Transport Length After Valve Transport Pipe Class Transport Pipe Size Max Elevation Lift Manifold Length Man¡fold Pipe Class Manifold Pipe Size Number of Laterals per Cell Lateral Length Lateral Pipe Class Lateral Pipe Size Or¡fice Size Or¡fice Spacing Residual Head Flow Meter 'Add-on' Fr¡ction Losses Galculations 1.25 5¿ 40 1.50 6402 4 40 1.50 4 o 40 1.50 4 65.5 40 1.50 5t32 5 None U inches feet inches feet inches feet feet ¡nches feet inches inches 250 200 '150 100 50 PumpData 5 10 15 20 25 Net Discharge (Spm) 30 35 40 ooll- ¿oÞ lltq)¿ .9 Ef! c, or oÞ inches feet feet feet M¡n¡mum Flow Rate per Orifice Number of Orifices per Zone Total Flow Rate per Zone Number of Laterals per Zone % Flow Differential l sUlast Orifice Transport Velocity Before Valve Transport Velocity After Valve Frictional Head Losses 0.68 44 29.9 2 3.1 4.7 4.7 gpm gpm % fps fps Loss through Discharge Loss in Transport Before Valve Loss through Valve Loss in Transport after Valve Loss in Manifold Loss ¡n Laterâls Loss through Flowmeler 'Add-on' Friction Losses Pipe Volumes o.J 1.7 6.9 0.2 0.0 0.4 0.0 0.0 00 feet feet feet feet feet feet feet feet gâls gals gals gals gals gâls nd Vol of Transport Line Before Valve Vol of Transport Line After Valve Vol of Manifold Vol of Laterals per Zone Total Vol Before Valve Total Vol After Valve rqu¡rements 29.9 24.5 3.4 0.4 0.3 13.9 3.4 14.6 PF3005 High Head Effluent Pump 30 GPM, 1/2HP 1151230V 1Ø 60Hz,2OOv 3Ø 6OHz PF3007 H¡gh Head Effluent Pump 30 GPM, 3/4HP 23OV 1Ø 6OHz,2O0|46OY 3Ø 60Hz PF3010 High Head Effluent Pump 30 GPM, 1 HP 23OV 'lØ 60H2, 200/460V 3Ø 60Hz PF3015 High Head Effluent Pump 30 GPM, 1-1l2HP 230v 1Ø 60H2,2o0l230l461v 3Ø 6OHzm"a. "/ Í : a,- ,.,t 9 ì I ï \j :' t' \ \ \ x a System Curve: - Pump Curve: * Pump Opt¡mal Range:- z2 Operating Poinl: ""t Design Point: E@@t@ gpm feet 2844 Hwy 133\Legendal Roeooo2'."'' Sopns t-encrngor\"-tr:)l!;=l-t:t-; 6125122, 11:32 AM Account Parcel Property Address Legal Description Acres Land SqFt Tax Area Mill Levy Subdivision qPublic.net - Garfield County, CO - Property Record Card: R090009 *DqFublic.nef" Garfield County, Co Summary R090009 246303400072 ,CARBONDALE,CO 87623 Section: 3 Township: I Range: 88 A TR lN LOT 1ó. FOR FULL LEGAL DESCRTPTTON REF. RECEPTTON NUMBER 871ó35. 27422SQFT 0 27,442 9 79.74LO Y)w.Msp- Owner RUIZ HOYOS, MARIA DEL ROCIO & ROSALES,A 2307 COUNry ROAD 154TRAILER1 GLENWOOD SPRINGS CO 81ó01 Land UnitType LESSTHANlAC-0510(VACANTLAND) SqsâreFeet 27,442 ActualValues Assessed Year Land Actual lmprovement Actual Total Actual Assessed Values Assessed Year Land Assessed lmprovement Assessed Total Assessed Tax History 2022 $2s0,0óo.oo $3,o7o.oo $2s3,070.00 2022 $72,s00.00 $8e0.00 $73,390.00 2020 $4.4s9.08 292! $250,000.00 $3,o70.oo 92s3,070.00 2027 $72,s00.00 $89o.oo $73,390.00 2079 $4,478.o4 2020 $2OO,OOO.OO $3,ó5o.oo $203,ós0.00 2020 $s8,000.00 $1,0ó0.00 $s9,0ó0.00 2078 $3,726.48 5ale Price $250,000 2027 $s,8s2.2O Click hgte to viglv the tax intormation for this parcel on the Gadield ÇountyTfeasurgr's website. Transfers Tåx Yeãr Taxes Billed Sale Date 4/18/2019 rr/20/20t5 ru20/20L5 6/4/1978 77/77/r972 Deed Type WARRANTYDEED QUITCLAIM-DEED QUITCLAIM DEED QUIT CLAIM DEED Reception Number ?.1e41ç BZ163s 87p941 287814 256002 Book - Page osi/.-os47 0437-0506 $o $o $o $oWARRANryDEED Property Related Public Documents Çliçk here to vie¡ry P.¡pp-g$v ßej4Cd-egugggcume$: Photos https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&KeyYalue=R090009 1t2 6125122, 1'l:32 AM qPublic.net - Garfield County, CO - Property Record Card: R090009 No data available for the followíng modules: Buildings, Sketches. î. a:'í !, \a., a:.,:,:a .a-'. a;: I ili 3ií: a:aa. 9sst-Ply.sçt Bs!is.:t Ç_pPR l,¡ir¡acv Notiçe L-a.;t-Ðç-tç-!).p.1ç¡4;-ó-/2-5-/292.?,12j9-5:.4?-4\4. i. ) e'¿ {}1 í } t} t). } 3::;'l l*)Fsþrp;dçl ".1 :: : :;i ¿s r t 2.3.1ì-* 3. https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&KeyValue=R090009 2t2 #qFtrþlic,Het* Garfield County, Co Account Number Parcel Number Acres Land SqFt Tax Area 2019 Miil Levy R090009 246303400072 0 27,442 009 79.7470 Physical Address Owner Address 0 CARBONDALE RUIZ HOYOS, MARIA DEL ROCIO & ROSALES,A 2307 COUNry ROAD 154TRAILER1 GLENWOOD SPRINGS CO 81ó01 Overview Legend fi Parcels Roads Parcel/Account Numbers Highways : Limited Access - Highway -"-' Major Road --" Local Road ""- Minor Road Other Road Ramp ** Ferry Pedestrian Way Owner Name 1 Lakes&Rivers * County Boundary Line 2Ol9TotalActual $253,070 Last2Sales Value Date Price 87623 4/78/2079 $2s0,000 7r/2Ù/2}rs $O D ate cr e ate d: 6 / 25 / 2O22 Last Data Uploaded: 6/25/2022 2:05:42 AM Deve roped "{*) ãgå'¡BL9çl