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Home My WebLink AboutOWTS Design129 Cerrus Larr,rE CaReor.¡oRlE, CO a1 623 970.309.5259 CARLA.oSTBERG@GMAI L.CoM r.tf.;t"l' I(' ('( t¡i¡.t(' t-"t'I s;( ; June 4,2022 Project No. C1708 Maureen O'Brein Up4walk@yahoo.com Subsurface lnvestigation and Onsite Wastewater Treatment System Design 2-Bedroom Residence 24 CR 111 Garfield County, Colorado Maureen, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 0.209 property is located outside of Carbondale, in an area where OWTSs are necessary. The parcel is located on the northeast of the intersection of Hwy 133 and CR 111 (Prince Creek Road). Legal Description: Section: 3 Township: I Range: 88 A TR lN LOTS 18, 19 (SEC 3), & LOT 1 (SEC f O). A TRACT OF LAND LOCATED IN THE SE % OF SEC 3 AND THE NE % OF SECTION 10 CONTAINING .21 AC+I-, SAID TRACT BEING MORE PARTICULARLY DESCRIBED PER SPECIAL WARRANTY DEED. Parcel lD: 2463-034-00-049 SITE CONDITIONS The parcelwas previously developed with a modufar home which has since been removed. A new, 2-bedroom residence is proposed The residence will be served potable water from the town of Carbondale. We believe the existing water line is likely galvanized from the original development of the parcel. We recommend the water liñe be replaced. This water line must be at least 25-feet from the soil treatment area (STA) or if it comes within 2S-feet of the STA, it must be encased (see W4.0/3 Encasement Detail). A ditch runs along Hwy 133 to the west. No OWTS components may come within 5O-feet of the ditch. Setbacks to the proposed STA include 2O-feet from the residence and 1O-feet from the property line. This site is constrained and there may be slight encroachment on the setbacks to the house and property lines. The area is relatively flat and will be located to the south of the residence. 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. Page 2 SUBSURFACE The subsurface was investigated on April 19,2A22 by digging one soil profile test pit excavation (Test Pit). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation..l Only one Test Pit was excavated due to limited area on the property. The materials encountered in Test Pit #1 consisted of dark brown topsoil to 2.O-feet, underlain by medium brown clay loam to 5.S-feet, underlain by reddish brown sandy loam and cobbles 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 to weak. The soil formed 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. This soil is classified as SoilType 3 to 34, Clay Loam. Another sample of the soils was taken from Test Pit #l at 5.5-feet below grade. The structure grade was moderate. The soilformed a ball and a ribbon less than 1-inch before breaking. Soil structure shape was single-grain. Consistence was loose. Soil texture was gritty. This soil is classified as Sandy Loam with rock content between 35-65%, Soil Type R-1. We are proposing an over-excavated, unlined sand filter with a minimum 3-feet of Secondary Sand installed at a depth of 5.5-feet. A long term acceptance rate (LTAR) of 0.8 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 CPOWVisual and Tactile Evaluation of Soils Training. Page 3 Clay Loam to S.5-feet Firm, blocky peds Sieved sample Ribbon 1-2 inches in length Page 4 Backfill Sieved sample Ribbon less than 1-inch DESIGN SPECIFICATIONS Any existing OWTS components from the former residence on the propêrty must be properly abandoned. Desion Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 2 Bedrooms = 300 GPD LTAR = 0.8 GPD/SF 300 GPD / 0.8 GPD/SF = 375 SF The OWTS design is based on 2-bedrooms. An average daily wastewater flow of 300 GPD will be used For the purposes of this OWTS design, Benchmark Elevation has been established as 100' as the Finished Floor elevation of the Main Level of the residence. CBO lnc. should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. : \ Sandy loam with cobbles at 5.5Jeet Page 5 *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 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 1O0O-gallon, two-compartment concrete Valley Precast 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 55 gallons each pump cycle, allowing approximately 3 gallons of drain back after each pump cycle. A pump curve is enclosed. 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. Table Effluentwill 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 drain back into the tank after each pump cycle. The ADV must be placed at a high point in the system 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 .5-inch diameter distribution lines to a 13' x 29' bed. A minimum of 3{eet of sand filter material will be installed in the over-excavated footprint. The excavation must extend to the soil horizon with sandy loam and cobbles. 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 submitted to this office prior to obtaining the sand. Laterals must be 1.5-inches in diameter with 5/32-inch diameter orifices facing down, spaced 2-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 with 3.0-feet between the middle laterals. Four 39" wide GeoMatrM must be placed on the 13-foot wide bed. 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. OWTS Gomponent Minimum Elevation Primary Tank lnlet lnvert Approximate horizontal distance B' / min. 2o/o lall I min.2" fall Automatic Distributing Valve Approximate horizontal distance 31' / min. 1o/o rise I min.3.875" rise lnfiltrative Surface Approximate horizontal distance 10' / min. 1% fall I min. 1 .25" fail Dose Range Max = 78 gal. (300 GPD x25o/o + 3 qal drain back) Min. 31 gal. (7 gal x 4) + 3 gal drain back Dose Setting 55 gallons/dose 3 gallons drain back (31' I 1.5" diameter pump line) Float Separation 1000 gallon 2-compartment Valley Precast concrete septic tank 8" on/off float separation Pump Criteria 20.3 gallons per minute (GPM)15.4 feet total dynamic head (TDH) Page 6 Each 1.5-inch diameter lateral must end in a sweeping ell facing up with a ball valve for flushing. Valves should be placed in a 10-inch sprinkler box for access. Laterals must be covered by the gray soil separation fabric and at least 1-foot of topsoil or other suitable soil able to support vegetative growth. There shall be no coþble-sized (<2.5') or greater rock in final cover over the GeoMatrM, lnspection ports must be placed at each corner of each bed. Ports may be cut to grade and covered with a valve box 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 OIVTS Permit provided by Garfield County Building Department, and this design. INSTALLATION CONTRACTOR CBO lnc. cxpccts that tho 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. GOMPONENT MANUFACTURER MODEL NO COMMENTS Septic Tank Valley Precast Item # 1000T-2CP-HH 1000-gallon,2- ;ompartment concrete septic tank with high head pump Pump Orenco@ PF300511%HP '120 Volt Brotube ProPak Pump Packaqe Orenco(Ð BPP30DD Vault, Filter, Control Panel Ídemand dose) Tank Risers and Lids Orenco@ ljouþle-walled PVÇ Rtsers and Lids (24" diameter) ADV Orencoß)v64024 1.5" lnlet and Outlets AIJV l-{tser and Ltd OrencoG)Double-walled PVC Risers and Lids (30" diameter) 3eoMat rM GeoMatrix Systems, LLC ,116, GeoMalru (39,, sheets) 52 orifice shields Flushing Assembly orenco(Ð 1.5" dtameter Page 7 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 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. 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. Page I 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 O\ /TS 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 (ß'\tæ }stú'rxg Carla Ostberg, MPH, REHS Romeo A. Baylosis, PE t I I6 2-2022 T tÞas8e3 Pump Selection for a Pressurized System - Single Family Residence Project 24 CR 111 Parameters Discharge Assembly Size Transport Length Before Valve Transport Pipe Class Transport Line Size Distr¡buting Valve Model Transport Length After Valve Transport Pipe Class Transport PÌpe Size Max Elevation 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 Spac¡ng Residual Head Flow Meter 'Add-on' Friction Losses inches 300 250 inches 200 feet Calculations 100 Minimum Flow Rate per Or¡fice Number of Orifices per zone Total Flow Rate per Zone Number of Laterals per zone % Flow Differential lsvLast Or¡fice Transport Veloc¡ty Before Valve Transport Velocity After Valve Frictional Head Losses t.¿c 40 1.50 6402 10 40 1.50 2 3 40 1.50 4 28 40 1.50 5132 5 None U feet inches feet leet feet inches inches inches feet feet inches feet d,ol¡. to da!oT .9 EoË o 1! Ê 150 50 PumpData 5 l0 15 20 25 Net Discharge (Spm) 30 35 40 0.68 30 20.3 2 0.7 3.2 3.2 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 rn Laterals Loss through Flowmeter 'Add-on' Frict¡on Losses Pipe Volumes 2.9 0.8 4.3 0.3 0.0 0.'1 0.0 0.0 feet feet feet feet feet feet feet feet 0 0 d Vol of Transport Line Before Valve 3.3 Vol of Transport Line After Valve 1.1 Vol of Manifold 0.3 Vol of Laterals perZone 5.9 Total Vol Before Valve 3.3 Total Vol After Valve 7 .3 lquirements gals gals gals gals gals gals PF3005 H¡gh Head Effluent Pump 30 GPM, 1/2HP 1151230V 1Ø 60H2,200Y 3Ø 60Hz PF3007 High Head Effluent Pump 30 GPM, 3/4HP 230V 1Ø 60H2, 200/460V 3Ø 60Hz PF3010 High Head Effluent Pump 30 GPM, 1HP 230V 1Ø 60H2, 200/460V 3Ø 60Hz PF3015 High Head Effluent Pump 30 GPM, 1-1l2HP 230V 1Ø 60H2,20012301460V 3ø 60Hz gpm feet çYSfEMSM System Curve: - Pump Curve: * Pump Qptmal Hange:_ouperalrng Pornl: o Design Point: 20.3 15.4 NÅr-------tSCALE: r = 5ü=t'RESIDENCEISEPTICTANKLINEtCOUNTY ROAD I11)THE LOCATION OF PROPOSED IMPROVEMENTS SHOWN ARENOT THE RESULI OF A PROPERry SURVEY. THE LOCATIONSARE APPROXIMATE. IT IS TI.IE HOMEO/VNERS' DUTY TOENSURÉ ALL CONSTRUCTION AND IMPROVEMENÏ LOCATIONSARE ACCURATE. PROPERTY LINES AND SETBACK DISTANCESSHOULD BE CONFIRMEO PRIOR TO EXCAVATION. SCALEDFOR PR¡NTING ON 1 1" X 17" PAPER.DRAWINGS MUST BE USED INCONJUNCTION WITH DESIGNLETTER DATED O610412022ASITE PLANSTA-\\LINEv{2.0w1.0Sheel 1 F 4Eate: æ10412022Designed by: CBOReviewed by: RBtrrawn by: DDO'Brien Residence2¡t CR 1 11Garfield County, CoþradoProjectNumber: C1708CBO lrìc.129 Cair¡s LæeCarbondâle, Colorado 8'l 623Phonê 970.3o9.5259carla.ostberg@gmail.æmM CBO lnc.1 29 Cains LaneCarbondale. Colorado 81623Phone 970.309.5259carla.ostberg@gmail.com30'DIAI\¡ETER PVCSTA TO DITCH50'74',STA TO WELL1 00'N/ASTA TO HOUSE20'19'*SEPTIC TANK TO DITCH50'r00'SEPTIC TANK TO WELL50'N/AHOUSE TO SEPTIC TANK5',8'OW]'S COMPONENÎS ANDPHYSICAL FEATURESMINIMUM REOUIREDSETBACKAPPROXIIVATE PROPOSEDSETBACKRISERDESIGN2-BEDROOM RESIDENCE(75 GPD x 2 PERSONS/BEDROOM x 2 BEDROOI\¡S)WASTEWATER FLOW = 300 GPDTANK:USE lOOO-GALLON, TWO-COMPARTMENT CONCRËTE SEPTIC TANK WITHORENCO PUMPING SYSTEM IN SÊCOND COI\,IPARTMENT.DISTRIBUTINGVALVE ASSE¡,¡lBLYFROMPUMPING1.5' DtA SCH-40PVC INLET ANDOUTLETSSOIL TREATIVENT AREA (S-TA):LONG TERI\¡ ACCEPTANCE RATE (LTAR) = 0.8 GAL/ SFCALCULAïED STA = Q/LTAR = 300 / 0.8 = 375 SFOVER-EXCAVATED UNLINED SAND FILTER WITH MIN. 3' SAND FILTERMATERIAL (OVER-EXCAVATION IVUST EXTEND TO THE COBBLE DEPTH)13'X 29'BED WÏH GEOMAT FOR DISTRIBUTION*DUE TO SITE CONSIRAINS. THERE MAY BE SLIGHT ENCROACHMENTS fOSETBACKS TO THE HOUSE AND SOUTHERN PROPERTY LINE./A AUTOMATIC DISTRIBUTNGVALVE DETAIL40END CAP IVUSÌ BÉGLUED OR SECUREDIN A WATER TIGHTFASHION WITHUNDERGROUNDSFAI ANTENCASEMENT PIPE40 RIGID ËNDCAP AT EACH ENDOF PIPESOIL PROFILE TEST PIT NO. 1DRILLED IN END01234578I10LEGENDt=l topsoilff ct"yloamlTl sandyl'I loamLINECAP IVUST ONLY BELARGE ENOUGH TOALLOW SEWER LINE TOFIT THROUGHDARK BROWN TOPSOIL^ENCASEMENT DETAIL\j/,--ffiIUEDIUIV BROWN CLAY LOAI\¡'10" DIA VALVE BOXWITH SECURED LIDREDDISH BROWN SANDY LOAM WTHCOBBLES1.5'PVC SLIP X MALEPIPE THREADADAPTER W/CAP1.5" DIA BALLVA.LVE1.5" DIA SCH¿O PVCLONG SWEEP 90'ELBOWNO GROUNDWATER OR BEDROCK ENCOUNTEREDDURING EXCAVATIONINSTALL FLUSHINGVALVÊ ECCENTRIC TOCENTER OF VALVE BOXGEOMATOVER-EXCAVATE TO DEPTH OF SANDY LOAM WÏHCOBBLES1.5' DtA SCH-40 PVCLATERAL^sotls LoG\r,-F6ãE/A FLUSHING VAL\E DETAIL\3,r-ffirtO'Brien Residence24 CR 111Gãrfiêld County, ColoradoProject Number: C1708Date: 0610412022DesignedReviewedby: CBOby: RBDrawnby: DDw4.0Sheet 4 0F 4 1t26n2,2,00 PM qPublic.net - Garfield County, C(J - Property Record Card: R08408/ G)qPublic.net"' Garfi eld County, CO Summary Account Parcel Prof¡erty Address Legal Dercription Acres Land SqFt TexAreâ Mlllt€vy Subdlvlslon R084087 ?463034æ449 ?4 I r 1 CnUNTY nn,CARBCTNDALE, Crf, 81ó23 Section: 3 Township:8 Range:88 ATR lN LOTS 18,19(SEC 3),& LOT 1(SEC I0l.ATRACT OF LAND LOCATED tN THE SE1/4OF SECÍ|ON 3 & THE NE1/4OF SECTION 10 CONTAINING.2lAC. +/-, SAtD TRACT BEINC MORE NARTICULARLY DESCRIBED PER SPECIAL WARRRANry DEED REC. NO o.209 0I 79.74l.O ViewMap Owner LUTTRELL, PAUL D & OBRIEN, MAUREEN A TlCRESTONEWAY NEWCASTLE CO 81ó47 Land Unlt Type VACANT RES LOTS - 0100 (VACANT LAND) SquareFeet 0 Actual Values AsêssêdYear Land Actual lmprovement Actual Total Actuel Assessed Values Assessed Year Land Assessed lmprovement Assessed Total Assess€d Tax History 2020 $2,364.68 2o2t s120,000.00 $o.oo t120,q¡o.q) 202L $34800.00 $0.00 $34,800.00 xt79 $2,385.72 20.m $1o8,OOO.OO $o.oo f108,0æ.(x) 2020 $31,320.00 $o.oo $3r"320.q) 2ßta $77.O4 2o2L $2,775.æ Click here to view the tax ¡nformation for this paEgþühg_çerÉSlg-çgg$y lCasulgl5_websjle. Transfers TaxYear Taxes Billed Sale Date 5/L4/2078 6t4/2æ9 LLnt2007 8/16/2002 9/3t7975 6/3/1968 Deed Type SPECIALWARRANWDEED DEATH CERTIFICATE EASEMENT EASEMENÏ QUITCLAIM DEED WARRANTYDEED Reception Number 906744 770773 737665 ó09059 269704 247067 Book - Påge 1378-499 o479-O564 0394-05ó9 Sale Prlce $85,OOO $o $o $o $o $o Photos https://qpublic.schneidercorp.com/Appllcation.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=359733098&KeyValue=R084087 'lt2 1125122,2:00 PM qPublic.net - Garfield County, CO - Property Record Card: R084087 Nodata avâllableforthefollowlngmodules: Bu¡ldings,Sketches. aaIrlÕr ilij ¿u¿ìtt!rll,l'ìai User Pûacv Po-licy GQP_&Pr:l¡racv Nqtice lasJ. S ata v pþ4:J1Æ/ -2922-12Æ53 4t4. [-lcv::ropcil ì;1 C)Fså,s"rdçr rlL:rst,:i:2.iIi) https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=359733098&KeyValue=R084087 212 tÐqPublic,net'"' Garfield County, CO Overulew -J - -l Account Number Parcel Number Acres land SqFt Tax Area 2019M¡[ Levy R084087 24ó30340no49 Physical Address Owner Address 24 111 COUNTY RD CARBONDALE LU I I RT,LL, PAUL IJ ¿i OtsRIIN, MAUREENA TlCRESTONEWAY NEWCASTLECOSTó47 2019Total Actual Value Legend ll.l earcels Roads Parcel/Account Numbers Highways - Lim¡tedAccess - Highway Major Road Local Road Minor Road Other Road Ramp '" Ferry Pedestrian Way Owner Name f,l Lakes & Rivers - CountyBoundary Line $120,000 Last2Sales Dete Price 5/74/20!8 $85,000 6t4/2W9 $O 87623 0 0 009 79.74IO Date c¡eat¡.d:7/25f2022 Last Data Uploaded: U25/2O222:7O:57 AM Deve rooed bvGì *þg,SJdçf GCC LOFTS LLC R090046 246303400033 HOLGATE ETTA L R090045 246303400025 R450037 24630341 0006 CARBONDALE TOWN OF ROW R082681 246310100090 BAILEY FAMILY INVESTMENT COMPANY lå¡ Å