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Home My WebLink AboutEngineer's OWTS Design PlanCBO INc. I29 CAINS LANE CARBoNDALE, CO 41623 970.309.5259 CARLA. OSTBERG@GMAIL. CO M iitl:I'ar.ic: c{r${attJ I;!fI,lY.(; July 12,2021 Project No. C1614 Ben Wagenman oleoconstruction@qmail.com Subsurface lnvestigation and Onsite Wastewater Treatment System Design 3-Bedroom Residence + 2-Bedroom ADU TBD CR 238 Garfield County, Colorado Ben, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OW|.S) design for the subject residences. The 5.543-acre propefi is located outside of New Castle, in an area where OWTSs and wells are necessary. We have made some clarifications from the design dated June 29,2021, which should be discarded and replaced with these dated July 12,2021 . Legal Description: Section: 6 Township: 6 Range: 91 A TR lN SEC 6 CONT 6.35 AC AKA LOT 2 MAVES SUBDIVISION EXEMPTION. EXCEPT A TR OF ISND CONT .807 AC +/. AS DESC IN BNDY LINE ADJ BK 1636/937 AND QCD BK 1636/940 5.543 ACRES Parcel lD: 2181-062-00-283 SITE CONDITIONS The property is currently undeveloped. A 3-bedroom, single-family residence and detached 2-bedroom accessory dwelling unit (ADU) are proposed. The property will be served potable water from a private well. The well is located to the west of the proposed ADU. The well will be located greater than S0-feet from the proposed septic tank and greater than 100- feet from the proposed soil treatment area (STA). The water line will enter each residence from the east and will not come within 25-feel of any OWTS component. The proposed STA location has an approximate 5-10% slope to the southwest. The proposed area vegetated with native grasses. There should be no Oaffic or staging of material over the fufure STA site to avoid compaction of soils prior to construction of the STA. SUBSURFACE The subsurface was investigated on May 4,2021 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 excavalion.l I Carla Ostberg holds a Certificate of Attendance and Examination from the CPOWVisualand Tactile Evaluation of Soils Training. Page2 The materials encountered in Test Pit #1 consisted of dark brown topsoil to 0.S-feet, underlain by light brown, dense sandy loam to a maximum depth explored of 8.O-feet. No bedrock or groundwater was encountered. The materials encountered in Test Pit #2 were consistent with those encountered in Test Pit #1. Test Pit #2 was elplored to a maximum depth 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 weak. The soil formed a ball and a ribbon less than 1-inch in length before breaking. Soil structure shape was blocky and consistence was friable. Soil texture was more gritty than smooth. STA sizing is based on Soil Type 2A, Sandy Loam with weak structure grade. A long term acceptance rate (LTAR) of 0.5 gallons per square foot will be used to design the OWTS. Test Pit #1 Page 3 Test Pit #1 Sieved sample Looking est Page 4 Sidewall of Test Pit #2 Page 5 View of site DESIGN SPECIFICATIONS Desion Calculations: nverageOesignFlow=75GPDx2people/bedroomx3Bedrooms=450GPD+2-BedroomADU(300 GPD; = 750 GPD LTAR = 0.5 GPD/SF 750 GPD / 0.5 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers; = 1050 SF The OWTS design is based on 3-bedrooms in the main house and 2-bedrooms in the ADU. An average daily wastewater flow of 750 GPD will be used. For the purposes of this OWTS design, Benchmark Elevation 100' has been identified Finished Floor of the Main House. 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 installation due to site conditions. Component elevations may change during 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 must include a 1S0O-gallon, two-compartment poly lnfiltratot@ septic tank with an effluent filter on the outlet tee. A concrete septic tank may be substituted, if desired. Risers must bring the manhole lids to grade for access. lf more than one riser is added to the septic tank, an extension handle must be installed on the effluent filter. Minimum ElevationOWTS Component Approximate horizontal distance 143' / min. 2o/o fall to septic tank / min. 35.75" fall Primary Tank lnlet lnvert Approximate horizontal distance 37' / min. 1o/o fall to d-box / min. 4.625" fall Distribution Box Approximate horizontal distance 10' / min. 1o/o fall to infiltrative surface / min. 1.25" to upper-most trench lnfiltrative Surface Page 6 Effluent will gravi$ flow to a distribution box, and then to five gravelless chamber trenches. The distribution box must be accessible from grade and must have flow equalizers, or similar product, installed on each outtet pipe in the distribution box to assure equal flow to each trench. Each trench will consist of 18 'Quick 4' Standard Plus lnfiltrator@ chambers for a total of g0 chambers and 1080 square feet of infiltrative area. There must be at least 4-feet of undisturbed soil between each trench. lnspection ports must be installed at the beginning and end of each trench. Ports may be cut to grade and placed in sprinkler boxes for access. 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. Construction must be according to Garfield County On-Site Wastewater Treatment System Regulations, theowrs Permit provided by Garfield county Building Department, and this design. INSTALLATION CONTRACTOR CBO lnc. expeCs that the installer be experienced and qualified to pei'form the scope of woi'r outlined in this design. The installer must review this design thoroughly and coordinate with our ofiice in advance of installation. Any additional conditions in this design or county permit must be completed and documented priorto final approval of the OWIS 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 houri 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 cornens or anothei fixed gbjects on the property. This sketch is most easily provided on Sheet \ 2.0 of the OWTS Design Packet. Photographs of the installation and final cover are also requested to supplement our installation documentation. COMPONENT IMANUFACTURER MODEL NO.lcoMMENTs Septic Tank f nfiltrator@ tM-1530-2CP ll 500gallon, 2-compartment lpolv septic tank Biotube Effluent Filter frenco@ lFutlsize lhousinq Effluent Filter and fank Risers and Lids f*""* lDouble-walled PVC lr-ios tz+'diameter) Risers and Distribution Box leoVrot lDistribution box, flow bqualizers. risers. lid Shambers llnfiltrator@ Standard Plus lgo 'Quick 4' lChamoers Standard Plus PageT 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 tiaproots), provides a maximum transpiration rate, and competes well with successional species. No trees or shrubs, or any vegetation requiring regular inigation 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 propefi owner is responsible ficr maintaining service contracts for manuhctured units, altemating STAs, and any other components needing maintenance. Geo-fubrics or plastics should not be used over the STA. No heavy equipment, machinery, or materials should be placed on the backftlled 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 re@mmend 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 controlsystem circuits. The pump system shall have a switch so the pump can be manually operated. Excavation equipment must not drive in 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 coun$ 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. Page 8 Please call with questions. Sincerely, CBO lnc. Carla Ostberg, MPH, REHS Ce,\{u 0st6u.g s 88"48'05'E ^--rZ.7sa-*uonht,@_9. Fount2" Pipe & 3-1/4" F6 Brass Cap Stamped "Countg Suregor Qarfeld countg co1/a s6 1979', 1,0' Aboue Surface x 1 4.5' ) I I Ferce b I I I I I I I ) A gy toso' ^ho' v lq \ CN N t @ SCALE: 1'= 50'4' Existing DittRoad DRAWINGS MUST BE USED IN CONJUNCTION WITH DESIGN LETTER DATED 07 I 1212021 "."t' I I CBO lnc, 129 Cains Lane Carbondale, ColoEdo 81623 Phone 970,309.5259 cada.ostbsrg@gmail.@m Wagenman Residence TBD CR 238 Garfleld County, Colorado Project Number: C1614 Datat 0612912021 Revlsedi07l121202' Designed by: CBO Drawn by: DD w1 .0 Sheet I 0F 4 2.BEOROOM AOU N 1 8.s', 3.BEDROOM RESIDENCE BM 100' FF 4' DIA SDR-35 SEWER PIPE WITH CLEANOUT MIN 206 FALL TO TANK 1 sOO.GALLON, TWGCOMPARTMENT SEPTIC TANK WITH EFFLUENT SCREEN 4'DIA SDR.35 SEWER PIPE WITH CLEANOUT MIN 2OlO FALL TO TANK \ SCALE: 1'= 20{"x \ Barl Wire CLEANOUT EVERY 1OO' o 4,{m€ 4" DIA SDR.35 SEWER LINE TO STA (MrN. 1% rALL TO CrA) BOX 10' 3.2', 4'DIA SDR-35 SEWER LINE TO EACH TRENCH (MtN. 106 SLOPE TO TRENCH) 4'DIA SDR.35 INSPECTION PORT AT BEGINNING ANO END OF EACH TRENCH WITH ACCESS AT GRADE I PROPERry 'QUICK.4' CHAMBER TRENCHES. 5 TRENCHES WTH 18 CHAMBERS PER TRENCH FOR A TOTAL OF 90 CHAMBERS AND 1080 sF. TP sy o:u/ *$/at/./ h Ol\r o|-r o\ CBO lnc. 129 Calns Lans Carbondals, Colorado 81623 Phone 970.309.5259 eda.ostbelg@gmail.om Wagenman Residence TBD CR 238 Garfleld County, Colorado Project Number: C1614 Oale: 06n912021 Reubed$7 112!2021 Dasignad by: CBO Drawn by: DD w2.0 Shest 2 0F 4 CBO lnc- 129 Cains Lane Carbondals, Colorado 81623 Phone 970-309.5259 @ds.ostberg@gmell.@m FINFILRTOR / exoewre oucK4 DIA SDR.35 SEreR CHAMBER (4'x 3)LIilE TO EACH TRENCH (MlN.1%SLOPETO TffircH) 4" OtA SDR-35 EFFLUENT HE FRN NOE: MAINTAIN SHALCM INSTALLATNN BETre€N Z AND 3 BSREfi6N BOX WH DIA SDR-35 AT GRADE lNsPEClls,l POffi PLACED IN 1',TOP rcRT OF CHNBER ENDMES so[-j' PIPE TO LF!4lT M TRENCH EXCAVATION fl&3', cHmER (4 x 3) 1" DIA SDR-35 INSPECTION PORT AT BEGINNING AND END OF EACH TRENCH /A olatBci{ IRENct{ rsEciitot{rgi---7f!lt //iC+lAlBER IRENO{ Pt l{u./t-'---?!rE VALW MWR BOX OR IRRGATION VIVE BOX AT GruE SLIP-ON PVC DO NOT GLUE CAP OR THRAED 24" MIN- CEANOUT ASSEilBLY TRACER WIRE FINISHED GRAOE ,t" DIA SDR-35 SEvt ER coilPAoT 4" DIA (MtN 20; SLOPE TO TANK, MlN. 1% TO STA)BASE TO SUPPORT BOX wc PIE cu To FIT SEWER LINE SCREENED USE HOLE SAWTO CUT THRUTOPOF ORSAND FOR BEDDING 3" MtN- END TO TANK MN. olNsEclleNlsl*tr rL /a\CLEAl'l OUT DEIAL\9|_il @.EssJErartu 18 CHffiERS ER TRENCH zll Wagenman Resldence TBD CR 238 Garfi sld County, Colorado ProisctNumben C1614 h,ee: o6t2gt2o21 heVsed:O7n2n121 besbned by: cBo lDrawn by: oo w3.0 Sheet 3 0F 4 CEOlm 129 Calns Lane Csrbondds, ColoEdo 81623 Phons 970.309.5259 crla.Gtberg@gmail.@m DESIGN iI€EDROOIT RESII,E {CE + I.BEDROOM ADU 75 GPD x 2 PERSONS/BEDRCIOM x 3 BEDROOMS = 450 GPD + 2.BEDROOM ADU (300 GPo) = 750 GPD WASTEWATER FLOW = 750 GPD STATO WATER COURSE 50'5{)' STA TO WELL 100 218 STA TO HqJSE 20'm' SEPNC TAHK TO WATER COURSE 50'50' SEPTIC TAM< TO WELL 50'23s' , HOUSE TO SEPTIC TANK 5'15 OWTS COUPONENTS AND PHYSICAL FEATURES MINIMI,'', REQUIRED SETBACK APPROXIMATE PROPOSED SFTBA(]K TANK: MIN. is{N GALLONS USE I5OGGALLON, TWGCOMPARTilENT POLY SEPTIC TANK SOIL TREATMENT AREA (STA): LOIIG TERM ACCEPTANCE RATE (LTAR) = 0.5 GAL/ SF CALCULATED STA = Q/LTAR = 750 / 0.5 = 1 500 SF GRAVITY, TRENCHES = |SOO SF X 1.0 = 15@ SF CHAMBERS = 1s0O SF X 0-7 = 1050 sF / 12 SF / CHAMBER = 88 CHAMSERS FIVE GRAVELLESS CHAMBER TRENCHES 18'QUICK il' CHAMBERS lN EACH TRENCH TOTA 90 'QUICK 4' CHAMBERS SOIL PROFILE TEST PIT NO. 1 SOIL PROFILE TEST PIT NO.2 -0rilt,t!.I t-, DARK BROWN TOPSOIL DARK BROWN TOPSOIL LIGHT BROWN SANDY LOAM WTH WEAK STRUCTURE GMDE LIGIIT BROW{ SANDY LOAM WTH WEAK STRUCTURE GRADE :u -6 I -9t,o BOXANO COVER BROUGHTTO GRADE CONCRETE LEGEND F topsoll F-T ilH' FINSHED GRADE NO GROUNDWAIER OR BEDROCK ENCOUNTERED DURING EXCAVATION BAFFLE OR ANGLED PIPE TO BE USED AT II\f,ET asoil.s LoG\rr---TE //5\ DISTRIBUTION BOX DEIAIL\9r........'._tT[ CUTLETS oooo Wagenman Resldence TBD CR 238 Garfi€ld County, CdoBdo Proiec't Numb8r Cl6l4 lD.ate: o6t2gl2o21 hrerlrsed:O7l12Do2' I oestsneo oy: cao loramur: oo w4.0 She€t 4 0F zl #qFuHlcngt- Garfield County, CO Physical Address Owner Address 0 NEWCASTLE 8T647 WAGENMAN,THERESA& BENJAMIN PO BOX 1954 GLENWOOD SPRINGS CO 81602 2019Total Actual Value Overview Legend fl Parcels - Roads Parcel/Account Numbers Highways r LimitedAccess * Highway * Major Road * Local Road - Minor Road * OtherRoad RamP ** Ferry '' PedestrianWay Owner Name @ Lakes&Rivers * CountyBoundary Line $160,000 Last2Sales Date Price 5/74/2027 $O 4/76/202! $200,000 Account R0410@ Number Parcel 2787062@283 Number Acres 6 LandSqFt 0 TaxArea 752 2019MillLew 67.0920 DaE qeaEdtT/U2O27 Last Data Uploaded: 7 f2/XJ2l !7:37:23 AM De.reloped bv /t S"l"=idOFt g€osPlrtt't 712t2021 qPublic.net - Garfield County, CO - Property Record Card: R041000 #qftruic,net* Garfield County, CO Summary Account Parcel Property Address lcgel Deseription Acres Land SqFt TaxArea Mllltwy Subdlvision R041000 218106200283 , NEWCASTLE,CO 81647 Section:6 Townshlp:6 Range: 91 ATR lN SEC 5 CONT 6.35 AC AKA LOT2 MAVES SUEDIVISION EXEMPTION. EXCEPTATROF LAND CONT.807 AC +/- AS NFSC IN BNDY LINE AEIJ BK 1636/937 AND QCD BK 1636/940 5.543 ACRES 5.543 0 752 67.0920 View Map Owner WAGENMAN, THERESA & BENJAMIN PO BOX 1954 GLENWOOD SPRINGS CO 81602 Land Unit lVpe 5 AC To L,lT 10 AC - 0530 (VACANT LAND) Square Feet 0 Actual Values Asscsscd Ycar 2021 20.20 2019 Land Aciual $160,000.00 $160,000.00 $160,000.0O lmprovementActu", *0.* $O.OO $O.OO TotalActual $160,qrO.OO $160,000.00 $16O,(X)O.OO Assessed Values AssessedYear 2O2l 2O2O 2C79 Land Assessed $46,21OO.00 $46,40O.0O $46,4013.00 Assessed Total Assessed thx History TaxYear 2020 $46,400.00 20t9 $46,400.00 2078 $o.oo $46,400.00 2017 Taxes Bllled $3,113.08 Cllck here to viewthe tax information for ihis oarcsl on the Garfreld County lieasurer's website. Transfers Reception Book- Sale SaleDate DeedType Number Pas. Price Grantor $2,930.96 $2,447.12 $2,183.88 Gmnte 5/14/2021 Easement 4IT6/202I SPECIALWARRANry DEED 95j7A4 954622 $0 WAGENMAN, BENJAMIN; WAGENMAN, PUBLIC SERVICE COMPANY OFTHERESA COLORADO $2OO,OOO TTTUS,DALER WAGENMAN, THERESA; WAGENMAN, BENJAMIN 3/TOI2O2T STATEMENTOF AUTHORIry 952746 $0 TITUS,SUZANNE-DEC T|TU5, SUZANNE-DECi TlTUs, DALE R 7/25/2021 DEATH CERTIFICATE 77/3/2OO4 QUITCLATMDEED a\t1M 66?A9I ],636- $O TITUS,SUZANNE $O TITUS,SUZANNE&DALE TITUs, DALE R GUCCINI,TOEY& DEBRA 94 AI3/2OA4 AFFIDAVIT 6(,?A9O 7636-$o 937 3/29/2004 tNCLUStON 654545 1598- 320 $o https://qpublic.schneidercorp.com/Application.aspx?ApplD='t 038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=1526834&KeyValue=R041000 1t2 7t2t2021 qPublic.net - Garfield County, CO - Property Record Card: R041000 7/27/2OO4 WARRANryDEED 647047 1563-$o 225 7/27/?OO4 WARRANryDEED 645446 7556- 929 $747,OOO MAVES,DAV|DW TITUS, SUZANNE & DALE R t/20/2004 RESOLUTION 645280 1556-$o 494 I7/2O/2OO3 BOUNDARY LINE ADJUSTMENT 1540- 917 $o64r452 7\/2O/2OO3 QU|T CLATM DEED 641457 t54o-$o 975 t7/20/2003 EASEMENT 641450 1540-$o 972 T7/74/2OO3 POWEROFATTORNEY 645447 1556-$o 931 3/27/2OO7 QUITCLAIMDEED 5A?549 1260-$O MAVEs, DAVIDW& MAXINE J MAVEs, DAVIDW 669 6/311992 Deeds 0833- 0386 $o 7/!/t9OO Deeds 0458- o72A $o tltllg00 Deeds 0393- 0510 $o tltlt900 iitnsoo Deeds 0369- 0463 $o Deeds 0362- 0582 $o tltllg00 Deeds 0357- 0591 $o tltltg00 Deeds 0205- 0004 $o Photos No data available for the following modules: Buildings, Sketches. crr;n;:l l:* guar:ntesi. $evtloirrl l4rtt#^ider lher Privacv Pqlicy 9.P P.F f rivacv.Nptic"q La l Data uplendr..Z?/201t-?: li:AAM Varsion ?.3.1?8 https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=1526834&KeyValue=R041000 212