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Home My WebLink AboutEngineer's Design Plan129 CÆr.¡s LaNrE CARBoNDALE,CO A1623 970.309,5259 cAR L.A. osrB E RG@G MAI L. c oM l.il';l¡'l'I(' ('. DÀ*!"tl' l.'l'l S'{ ; May 1 1,2023 Dave Ockers david @ dockersconstruclion. com Project No. C1804 Subsurface lnvestigation and Onsite Wastewater Treatment System Design 4-Bedroom Residence Lot 12, Rapids on the Colorado Garfield County, Colorado Dave, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 2-acre property is located outside of New Castle, in an area where OWTSs are necessary. Legal Description: Section:4 Township:6 Range: 91 Subdivision: RAPIDS ON THE COLORADO Lot: i2 Parcel lÐ: 2181 -043-07-012 SITE CONDITIONS The property ís currently undeveloped. A 4-bedroom residence is proposed. The residence will be served potable water from a community water system. The water tap is located along the southern portion of the property. The water line must be at least 25-feet from the proposed soíl treatment area (STA). The proposed soil treatment area {STA) location is along the western portion of the property. The property is relatively flat before dropping off to the north, outside of the building envelope, toward the Colorado River. There should be no traffic or staging of material over the future $TA site to avoid compaction of soils prior to construction of the STA. SUBSURFACE The subsurface was investigated on April 6,2023 by digging two soil profile test pit excavations ffest Pits). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.l The materials encountered in Test Pit #1 consisted of dark brown sandy loam topsoil to 6.0-feet, underlain by medium brown sandy loam with some cobbles (less than 35%)to a maximum depth explored of 8.0- feet. No bedrock or groundwater was encounterecl. I Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page2 The materials encountered in Test Pit #2 consisted of dark brown sandy loam topsoil to a maximum depth explored of 8.O-feet. No bedrock or groundwater was encountered. A sample of the soilwas taken from Test Pit #1 at 3-feet below grade. Soil structure grade was moderate. The soil formed a ball and a weak ribbon less than f -inch in length before breaking. Soil structure shape was blocky and consistence was friable. Soil texture was more gritty than smooth. The soils were consistent with Soil Type 2, Sandy Loam, with moderate structure grade. A long-term acceptance rate (LTAR) of 0.6 gallons per square foot will be used to design the STA. Test Pit #1 l. ;,. Page 3 --.q]Ia Backfill Weak ribbon less than 1-inch Sieved sample ., aaf -qçt,.-,|lfæ* Some cobbles below 6{eet View of Test Pit #1 looking south toward Test Pit #2 Page 4 ïest Pit #2 1 ; Backfill Page 5 DESIGN SPECIFICATIONS Design Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 75 GPD (4th Bedroom) = 525 GPD LTAR = 0.6 GPD/SF 52s GPD /0.6 GPDISF = 875 SF 875 SF x 1.2 (gravity bed) x 0.7 (chambets) = 735 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 has been established as 100' as the northeast property corner. The Finished Floor (FF) of the residence will be 101.5'. The Garage FF will be approximately 101'. 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 duríng 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 2To grade to the septic tank. The system installation must include a minimum 125o-gallon, two-compartment septic tank with an Orenc@ Biotube effluent filter on the outlet tee. Any state-approved concrete or poly septic tank may be used. We have provided specifications for our preferred poly septic tank. 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 etfluent filter. Effluent will gravity flow to a distribution box, and then to two gravelless chamber beds. The distribution box must be accessible from grade and must have flow equalizers, or similar product, installed on each outlet pipe in the distribution box to assure equal flow to each bed. A 4-inch diameter SDR-35 level manifold must be installed to connect each row of the chamber bed. The chamber bed will consist of 3 rows of 11 'Quick 4' lnfiltrator@ chambers for a iotal of 66 chambers and 792 square feet of infiltrative area. lnspection ports must be installed at each corner of the beds. Ports may be cut to grade and placed in sprinkler boxes for access. COMPONENT SPECIFICATIONS The component manufacturers are typical of applications used by contraclors and engineers in this area. GBO lnc. must approve alternative components prior to installation of the OWTS. Requests must be submitted, in writ¡ng, to our office for approval prior to installation. Component technical data sheets are available upon request. OWTS Component Minimum Elevation Primary Tank lnlet lnvert Approximate horizontal distance 12' / min. 2% tall I min.3" fall Distribution Box Approxirnate horizontal distance 36'/ min. 1o/otall / min.4.5" fall lnfiltratíve Surface Approximate horizontal distance 5' / min. 1o/o tall lo STA / min.0.625" fall Page 6 Construction must be according to the jurisdiction's adopted On-Site Wastewater Treatment System Regulations, the OWTS Permit, and this design. PERMIT APPLICATION INSTRUCTIONS An OWTS Permit Application must be submitted to Garfield County Environmental Health Department. h ttpf ://U/r/w. g a rf i e I d -cp q Packet-Dec.-2019.pdf. lf the OWTS Permit Application will be submitted with a Bu¡lding perrnrt Application, it should be submitted directly to Garfield County Building Department. All questions regarding permit submission can be directed to Garfield County Environmental Health Department, 970-945-661 4 x81 50. INSTALLATION CONTRACTOR CBO lnc. expects that the installer be experienced and qualified to perform the scope of work ouflined in this design. The installer must review this design thoroughly and coordinate with our office ín 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. Communicatíon 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 hourð in advance to observe the ¡nstallation. 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 (ii applicable), septic tank location, STA location, and measurements from building corners or anothèi fixed obþcts 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. COMPONENT MANUFACTURER MODEL NO.COMMENTS Septic Tank lnfiltrator@ lM-1530-2CP Mlinimum 1 2ãA-gallon, 2- rompartment poly septic :ank (1 500-gallon septic :ank) Risers and Lids Orenco@ Double-walled PVC risers and lids Effluent Filter Orenco@ 4-inch dianneter Fullsize Ðistribution Box Polylok Distribution box, lids, 'ises, and (2)flow :qualizers Chambers lnfiltrator(Ð Standard Plus 66 'Quick 4'chambers PageT REVEGETATION REQUIREMENTS An adequate layer of good quality topsoil capable of supporting Íevegetation shall be placed over the entire disturbed area of the OWTS installalion. 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. Untilvegetation is reestabl¡shed, erosion and sediment controlmeasures 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 propeñy 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 nof 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 leaþ 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 ihe 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 condÍtions and shall be connected to a control breaker separate from the hígh-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 soíl 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. Lícensing of Systems Contractors may be required by county regulation. Page 8 Please call with questions Sincerely, CBO lnc. Carla Ostberg, MPH, REHS (ø.r, [* üsl'bx'-"g CBO lnc. '129 Cains Lane Carbondale, Colorado 81 623 Phone 970.309.5259 €rla.ostberg@9ma¡1.æm !r2.0 A -\ I IÞ 4.BEDROOM RESIDENCE t- ?,) RIVER \L \ \ \ \ )" -1 ,Ç+ )--r, / \ \ Ì s fP2 VALVE \ \ \ \ J a vtÉN PROPERTY 10'€ MIN. 25' SETBACK WATER LINE ÏO STA Spencer Gharles Holdings, LLC Lot 12, Rap¡ds on the Colorado Gartield County, Colorado Project Numben C1804 Oate: 05111nQ23 Designed by: CBO Drawn by: DD w1 .0 Sheet 1 0F 4 N ñæ SCALE; 1 = 50'=0" 100' ÏHË LOCATION OF PROPOSED IMPROVEMENTS SHOWN ARE NOT THE RESULT OF A PROPERTY SURVEY. THE LOCATIONS ARE APPROXIMATE. IT IS THE HOMEOWNERS'DUTYTO ENSURE ALL CONSTRUCTION AND IMPROVEMENT LOCATIONS ARE ACCURATE. PROPERry LINES AND SETBACK DISTANCES SHOULD BE CONFIRMED PRIOR TO EXCAVATION. SCALED FOR PRINTING ON 11'X 17" PAPER- DRAWINGS MUST BE USED IN CONJUNCTION WITH DESIGN LETTER DATED O 51 1 1 12023 CBO lnc 129 Cains Lane Carbondale, Colorado 81ô23 Phone 970.309.5259 carla.ostberg@gma¡l.com \ ,' ,X/'\-' a)N Å $ MIN 12so-GALLON, SEPTIC TANKWITH EFFLUENT SCREEN /-tt'- r-------ffi¡swr----l(MrN. 1% FALL TO i. SCALE: 1" = 20:0"PROPERTY 10' TWO (2)'OUtCK4',CHAMBER BEDS. EACH BED HAS 3 OF 11 CHAMBERS = 33 CHAMBERS X 2 = 66 TOTAL CHAMBERS = 792 SF 4" DIA SDR.35 PVC LEVEL 4" DIA SÐR.35 DISTRIBUTION LINE TO EACH BED (MtN. 1olo SLOPE TO BED) MIN. 10'TO PROPERTY 4" DIA SDR.35 INSPECTION PORT AT EACH CORNER OF BED € VtÉV'l LANÉ Æ\ PROPOSED OWTS CALL811 FOR UTILITY LOCATES Spencer Charles Holdings, LLC Lot 12, Rap¡ds on the Colorado Garfield County, Colorado ProiectNumben C1804 Date:05/1112023 Designed by: CBO Drawn by: DD w2.0 Sheet 2 0F 4 CBO lnc. '!29 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 cãria.ostberg@gma¡l.com 4" DTASDR-35 ÊFFLUENT P|PE (MtN. FALL FROM OISTRIBUTION BOX) PIPES PLACED IN TOP PORT OF CI-IIAMBER END PI..ATES 4' DtA SDR-35 EFFLUENT PIPE FROM SEtrIC TANK 4' DIA SDR.35 SEWER LINE IO ÊACH SECTION OF BED (MrN. 1% SLOPE)'outcK4 CHAMBERS (4'x 3') RTOR END PI..ATE I 11 CHMBERS PER ROW 4" DtA SDR-35 PVC LEVEL MANIFOLD ,1 1 CHAMBERS PER ROW 4" DtA SOR-35 TNSPECTTON PORT CORNER OF EACH BÉD DISIRIBUTION BOXWITH AT GRADE /ACHAMBER BED PLAN 4' SÞR 35 INSPECTION PORT AT EACH CORNER OF STA ourcK4çrM)3X4' SLIP.ON PVC VALVE COVER DO NOT GLUE BOX OR IRRIGATON VALVE BOX ÀT GRAOE INSULATËD CAP OR THREADEO TRACERWIRE FINISHED GRADE CLEANOUf ASSEi¡BLY 4' 4'DIA COMPACÍ SEWER LINE BASE TO SUPPORT BOX PVC PIPE CUT TO EXTÊNT EXCAVATION USE HOLE SAW TO CUl THRU IOP ÔFTO TANK HOUSE END /:\CHAMBER BÊD SECI'ION \{,¡-------------/ã CLEANOUT DETAILSL¿l----................-ffi /;\INSPECTION PORT IN CHAMBER\3¡---ìã'Ë=ãûF- BACKFILL MUST BE MTNUS 3-tNcil MATERAL Spencer Charles Holdings, LLG Lot 12, Rapids on the Colorado Garfield County, Colorâdo Pro¡ectNumber: C1804 b;t., o;tiittort loes¡gneo ov, cao lDrawn bV: DD w3.0 Sheet 3 0F 4 CBO lnc. 129 Cains Lane Carbondale, Colorado 81 ô23 Phone 970.309.5259 €rla.o6tberg@gma¡l.com DESIGN FINISHED GRAOE 4.BÊDROOII RESIDENCE STA TO WATËR COURSE r00'143' STA TO WÊLL 50'N/A SÏA TO HOUSE 20'38' SEPTIC TANK TO WATÊR COURSE 50'152', SEPTIC TANK TO WELL 50'N/A HOUSE TO SEPTIC TANK 5'7', OWTS COMPONËN]'SAND PHYSICAL FEATURÊS MINIMUM REQUIRED SETBACK APPROXIMATE PROPOSED SETBACK75 GPD x 2 PERSONS/BEDROOM x 3 BÉDROOMS + 75 cPD (4th BEDROOM)24'MtN_WASTEWATER FLOW = 525 GPD TANK: MIN, 1250 GAI.LONS USE MIN. 1zsO.GALLON. TWO.COMPARTMENT SEPTIC TANK 4' DIA SDR.35 SEWER LINE (MrN 2olo SLOPE TO TANK, MrN. 1olo TO STA) SOIL ÍREATMENT AREA (STA): LONG TERM ACCEPTANCE RATE (LTAR) = 0.6 GAU SF CALCULATED STA = Q/LTAR = 525 / 0.6 = 875 SF GRAVITY, BED = 875 SF X 1.2 = 1050 SF CHAMBERS = 1050 SF X 0.7 - 735 SF / 12 SF / CHAMBER = 62 CHAMBERS TWO GRAVELLESS CHAMBËR BÊDS 3 ROWS OF 1 1 'QUICK 4' CHAMBERS IN EACH BED TOTAL 66 'QUICK 4' CHAMBERS SCRËENEO ROCK OR SAND FOR BËDDING 3'MtN. 8" MrN. /ATRENCH DETAILV7-ıæ SOIL PROFILE TEST PIT NO. 1 SOIL PROFILE TEST PIT NO. 2 tsUUi Itsù H *0 2 4 DARK BROWN SANDY LOAM DARK BROWN SANDY LOAI,I 6 7 I I 10 BOX AND COVER BROUGHT TO GRADE CONCRËTE -t-t ¡L L MEDIUM BROWN SANDY LOAM WITH soME coBBLES (<35%)fficRADÉ-RISÊRS (LIMIT TO 2.FEET MAX.) FROM SEPTIC TANK NO GROUNDWATER OR BEDROCK ENCOUNTERED ÐURING EXCAVATION BAFFLE OR ANGLED PIPE TO BE USED AT INLET Æ\ SOILS LOGs/ LËGEND n sandy loam OUTLETS oooo Spencer Gharles Holdings, LLG Lot 12, Rapids on the Colorado Garf¡eld County, Colorado Projec{ Numben C1804 loate: os/11/2023 I oesisneo oy: cao I Drawn bv: DD w4.0 Sheet 4 0F 4 ÐqPublialæt'" Garfield County, Co Physlcal Address Owner Address 0 NEWCASTLE 81647 SPENCER CHARLES HOLDINGS LLC 2OO MOUNTAIN SHADOW DIRVE GLENWOOD SPRINGS CO 81ó01 2019TotalActual Value Overview Legend i*l Parcets Roads Parcel/Account Numbers Owner Name fi Lakes&Rivers * CountyBoundary Line $47,920 Last2Sales Date Prlce 4/25/2022 $222,æ0 n/a $ Account R1703ó4 Number Parcel 2t81O43O7Ot2 Number Acres 2 LandSqFt 0 TaxArea O17 2O19MillLevy 55.1920 D ate cr e ated: 4 / 721 2O23 Last Data Uploaded: 4/72/2423 fl:34:49 AM Deveroned bv¡[¡;) *åmdgr 4112J23,9:38 AM qPublic.net - Garfleld County, CO - Property Record Card: R170364 G)qlbHic;æt* Garfreld County, CO Summary Ácc@nt R17O364 Pârcêl 274104347012 Prop€rtyAddr6e,NEwCAsItE,CO 81647 le&l D6crlptlon Sect¡on: 4lownship: ó Rãnge 91 SuMiv¡s¡o¡: RAPIoS ON THE COLORADO Lol 12 Acr6 2 lårdsqFt 0TâxArÞâ 17 Milll€vy 55.1920 Subdlv¡slon RAPIDSONIHECOLORAÐO Yigslg!') Owner SPENCER CHARLES HOLDINGS LLC 2OO MOUNTAIN SHADOW DIRVE GLÊNWOOD SPRINGS CO A1óO1 Land Unlt fype Square F€€t 1AC IO L/T 5AC.O52O IVACANT LAND} 0 Actual Values As*r*d Yeår Land Actùål lmprovement Actual ldâlAduel 2022 $47,02O00 $0.0o $47,020.00 2021 $45,ó4O.O0 $o.oo $45,ó40.00 2022 913.ó40.00 $o.oo $13,ó¡t0.0o 2027 $13,240.00 $o.00 $13,240.00 Assessed Values Ass!$ed Year Iand As$ssed lmprovemenLAssessed lotel Asssd Tâx History lax Year faxesBllled 2022 $7s2.80 202t $82s.12 2020 $530.40 mtg $so|.12 20!a Íó64.24 Click herê tov¡ilth€ tãx informãtion tor this @ 4/12J23,9:384M Transfers qPublic.nel - Garfield County, CO - Propêrty Record Card: R170364 R*€ptlon Nunb€r 973928 973927 958023 594733 Sel€ Date 1t25/2022 4t2s/2022 6t!0/2027 1?/28/200! 9/8/1997 9/3/79e7 uy19æ !7t1900 1tu79æ 7t1t7900 7t7t19@ uu7900 1/7t19@ Deed Typ€ STATEMENT OF AUÍHORITY SPECIAL WARRANIY DEÊD EASEMENT SPECIALWARRANTY DEED SUBDIVISION IMPROVÉMENTS SPECIAL WARRANTY DEÊD QUIICLAIM DEEÐ Resolutlon {veri@s types} Resolutlon {vårious types) WARRANTYDEED WARRANW DEED WARRANTY DE€D Deeds 513355 499822 435A27 265351. 2¿5350 2ê5246 731ó-983-947 1032-0948 1032-0945 1032-09ó1 099ó-oitó5 o834-O233 u6ó-0207 0ø,6ó-0204 u6ó-@?9 o479"0429 B@k - Page såle PrÍce $0 $222¡ÉD $o $o $o $o $o $o $o $o $o $o $o Property Related Public Documents Cl¡ck here to víM Propg4y:89!e!gdegþ!gg9!!Eg!ll! Nodata âÞllablefor th. followlng modulesr guíldin8r, Photos, sketches. https://qpubllc.schns¡dêrcorp.æm/Appl¡cst¡on.âspx?AppiD=1038&LayerlD=22381&PageTypelD-4&PagslD:9447&Keyvalue=R'l 70364 ¡nle.p¡?lðligiÌ D:ìt¿i5.ilrb¡)ítio(si!ì,ìñl(h¡r1¡lc¡ìr.lit5¡ccuia(,¡rrrl(,:)mjtclc,xr:rii,,¡'!riln-'iltr¡r.¡rÌ!e(il. User Privacv Policv GDPR P.ivacv Noti.e Last Datã UrJgA!Ljj:J229e3,9:34:49 AM vc, -rro¡¡ 3.1 l f k,!rll.tìcd by ft*¡rprdn