The URL can be used to link to this page

Home My WebLink AboutOWTS Design Report 09.25.2019September 25, 2019 Gregory Coffman 1837 County Road 100 Carbondale, CO, 81623 Ibarvee@gmail.com RE: Design Report—Onsite Wastewater Treatment System (OWTS), Coffman Property, 1837 County Road 100, Lot 3, Coffman Ranch Exemption Subdivision, Garfield County, Colorado SE Job No. 19204.01 Parcel Number: 2393-363-00-276 Garfield County Permit: SEPT -08-19-5912 Dear Gregoiy: This letter report presents the applicable findings in regard to the design and construction of an Onsite Wastewater Treatment System (OWTS) at the above referenced Site, in support of your OWTS permit application to Garfield County. The design recommendations, specifications and construction details are delineated on the attached OWTS permit/construction plan that is based on GIS, Survey Plat information, aerial mapping and site assessment observations by Sopris Engineering. The Sopris Engineering OWTS design is based on evaluation of existing physical site features, geotechnical soils investigation and site conditions with respect to the proposed residential usage, building layout and applicable regulatory design criteria that is in accordance with State and County OWTS Regulations. The design criteria and system sizing information is summarized below. Summary Design Criteria The OWTS is designed for a treatment capacity of 300 gallons per day based on the design wastewater flow to serve a 2 -bedroom residence in accordance with Table 6-2 values, Section 43.6, A.4. The OWTS will include the installation of a 1000 gallon 2 -compartment septic tank with risers and lids installed at the surface. The tank will be installed with an inlet sanitary tee and an outlet effluent filter sanitary tee. A gravity schedule -40 or SDR -35 sewer pipe with a cleanout will be installed from the residential structure to the tank. The soil treatment unit (STU) will consist of leaching chamber trenches that provide 350 S.F. of total absorption area. The septic tank effluent will be gravity discharged to the STU via a distribution box. The effluent will be equally distributed from the distribution box via 4" distribution pipes connected to the head end cap in each chamber trench. Observation ports with caps will be installed on each end chamber unit. The design is in compliance with the current County regulations with design calculations based on the soil type, texture and structure with an appropriate long term acceptance rate (LTAR). The designed system meets all required setbacks and will be installed within the general location indicated on the plan. Our design is outlined below and delineated on the attached C-1 plan. Existing and Proposed Site Location Conditions The subject site is located at 1837 County Road 100, Lot 3, Coffman Ranch Exemption Subdivision, Garfield County, Colorado The site is bounded to the south by public lands, to the North by C.R. 100, and to the East and West by adjacent vacant subdivision lots. The site is located on relatively dry sloped range land area with moderately sloping terrain downward toward the North with severe sloped terrain on the southern portion of the lot. Vegetation consists of sagebrush, Juniper, shrubs and grasses. The Site comprises approximately 4.3 acres. The site has an existing driveway, existing metal building and partially graded building envelope area. The new OWTS will serve the new 2600 S.F. residential 502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313 SOPRIS ENGINEERING • LLC civil consultants Coffman, OWTS, 1837 C.R. 00 SE Job No. 19204.01 September 25, 2019 Page2 structure to be constructed in the central north portion of the site. The OWTS field is located south of the proposed building structure on lightly sloped terrain 8%-l2%. Domestic water is supplied by an existing private domestic well. The proposed site improvements will include appropriate site grading around the structure, OWTS, and driveway improvements within the development area. Sub Surface Conditions and Observation A subsurface soil investigation and site assessment was performed by Sopris Engineering in September, 2019. The soils in the proposed field envelope area were sampled and characterized by application of the USDA visual/tactile soil texture method analysis. The soils below 6 to 12 inches of topsoil consist of medium dense slightly sandy silt loam soil with less than 10% scattered gravels and cobbles to 8 feet below the surface grades. The deeper underlying soils are composed of colluvial loamy soils with gravels and cobbles. The soils appear to be consistent across the site from observations of excavations. The native soils sampled from 2-3 feet below the surface are characterized as a soil type 2 consisting of silt loam texture with granular structure. This soil has an effective loading rate for conventional soil treatment of 0.6 Gal/S.F./day for a level 1 conventional treatment system. The equivalent percolation rate is assumed to be 15-25 minutes per inch. No free water was encountered in excavations on site. Seasonal high Groundwater levels are expected to be below 20 feet from the existing surface grades. The soils are suitable for a shallow conventional shallow absorption field consisting of gravelless infiltration chamber units. The Soil Treatment Unit (STU) field is designed based on utilizing the effective Long Terni Acceptance Rate (LTAR) for the native soils and the application of appropriate loading factors for a soil treatment unit system utilizing gravity distribution to gravelless chamber trenches. The new treatment system and absorption field will consist of gravity distribution of septic tank effluent via a distribution box to individual chamber trenches with treatment across the native soil absorptive surface. Design Flow The design flow is calculated for a single family residence onsite wastewater treatment system (OWTS). The treatment capacity is designed to serve a 3 -bedroom residence. From the Regulation 43 usage table : Minimum population based on 2 bedrooms = 4 persons. Gallons per day per person =75 gal/person/day, No peaking factor Max. Design flow (Qd)gallons/day = (# of people) x (avg. flow)gal/person/day. Design flow Qd = 6*75=300 gpd The septic tank capacity required for a minimum 48 hour detention time is calculated as follows: V = 350 gal/day * 2 = 700 gallons (Per Regulation a minimum 1,000 gallon capacity, two compartment septic tank is required). The tank shall have inlet and outlet sanitary tees with an effluent filter. The tank access shall be maintained with risers and lids installed at the finish surface grade. Treatment -Soil Treatment Unit/ Absorption System Design The Soil Treatment Unit (STU) field was designed based on utilizing the effective Long Term Acceptance Rate (LTAR) for the native soils and the application of appropriate loading factors for a soil treatment unit system utilizing gravity distribution to gravelless chamber trenches. The STU system consists of gravity distribution of Coffman, OWTS, 1837 C.R. 00 SE Job No. 19204.01 September 25, 2019 Page3 septic tank effluent via a distribution box to individual chamber trenches with treatment across the scarified native soil absorptive surface. Long Terni Acceptance Rate (LTAR) Receiving Wastewater Treatment Level 1; loading rate for silt loam is (0.60 gal./S.F./day) for soil type 2.; Loading factors; (Table 10-2, Gravity application trenches = 1.0) and (Table 10-3, gravelless chambers = 0.7) A(sf) = Qd .: A = Area; LTAR = 0.60 Gal/S.F./day for silt loam, soil type 2 Qd = flow (gal/day) = 450 gpd L.F.1 = 1.0 Gravity Distribution L.F.2 = 0.7 Chambers A(sf) = 300 gpd x 1.0 x 0.7 = 350 S.F. 0.60 Gal/S.F./day Number of quick -4 chambers: 350 S.F / 12 S.F./Chamber = 30 chambers Use 30 Infiltrator Quick -4 or equivalent BioDiffuser ARC 36 chambers with appropriate end caps. Install 30 Quick -4 chambers in two trenches 62' long by 3' wide with 15 chambers units per trench. Install end caps and inspection ports on both trench ends as delineated on the attached OWTS plan drawing. Inspection ports are to be installed on the top cutout on each end chamber or endcap. Additional soil evaluation will be performed during construction to verify the soils in the excavations. The shallow STU trenches shall be installed with a maximum depth to the absorptive surface of 36 inches from finish surface grades and backfilled with approximately 6 -inches of final grading topsoil mounded over the trenches placed to allow positive drainage away from the surface. Chambers shall be installed level in native soil. Each trench will be constructed level along the contour with successive trenches installed following natural contour grades accordingly. A minimum separation distance of 4 feet will be maintained between the individual trench sidewalls. A 4" discharge line will discharge effluent to a distribution box installed up gradient and adjacent to the field. The 4" PVC effluent discharge line will be installed with a minimum 1% slope. The distribution box will incorporate a riser section and access lid at the surface. The effluent will be equally distributed from the distribution box through individual 4" solid distribution pipes to the head of each trench. The invert out of the distribution box shall be at a level above or equal to the top of the highest chamber end cap. The engineer, prior to installation shall inspect the trench excavation to confirm suitable soil conditions. All septic system components and trench installations are to be approved by the Engineer and County prior to backfilling. Construction and Inspections Prior to construction of the permitted system, the engineer should be contacted by the contractor and owner well in advance to provide adequate time to discuss the system components with the contractor, answer questions, resolve any conflict issues and schedule inspection site visits based on construction progress. A pre-OWTS construction meeting is essential and required prior to installation of the OWTS. All septic system components shall be staked in the field for approval by the Engineer prior to excavation. Coffman, OWTS, 1837 C.R. 00 SE Job No. 19204.01 September 25, 2019 Page4 During initial construction the engineer will evaluate the soils in the absorption treatment field excavations to confirm soil conditions and make adjustments as needed. All septic system components and trench installations are to be approved by the Engineer prior to backfilling. All installation will be inspected, surveyed, reported and delineated in the Certification letter and record drawing. The contractor needs to photo document all OWTS construction phases and supply photos to the Engineer. County Regulations require that the Engineers of record perforin site inspections of the permitted system during construction and provide "As -Built" documentation of the installed system to the County after construction is complete. OWS Operation and Maintenance Ownership of the system and responsibility for maintenance and repair will remain with the property Owner. The Owner is encouraged to retain the services of qualified personnel to inspect the OWTS and to perform all maintenance and repairs necessary to ensure that the system components are maintained in good operating condition and suitable vegetative cover is established on the fields. The components of the OWTS system should inspected within 30 days of being placed into operation and should been inspected and maintained bi-annually. The tank, absorption field and other system components should be visually inspected bi-annually for debris, damage, leaks, or other potential problems. In general, for a properly utilized system, septic tanks should be pumped every 3 - 5years. The effluent filter should be cleaned every six months and at the time of pumping. Absorption fields should be maintained with suitable vegetative cover and kept free of root invasive plants. Positive surface drainage away from the absorption field should be maintained. If you have any question or need any additional information, please call. Sincerely, SOPRIS ENGINEERING, LLC Paul E. Rutledge Design Engineer Yancy Nichol, PE Principal GRAPHIC SCALE I or. him 11 40.00' PROPOSED 4" 2 -WAY CLEANOUT INV. EL=6966.25± 4" PVC SEWER PIPE @ 2%, USE SCHD-40 OR SDR -26 35.88' 2 -BEDROOM RESIDENCE FF 6278.5± INSTALL 1060 GALLON 2 -COMPARTMENT INFILTRATOR SEPTIC TANK (USE VALLEY PRECAST ITEM 4 IM 1060-2CP) WITH SEALED RISERS AND LIDS INSTALLED AT THE FINISHED GRADE SURFACE, INSTALL INLET SANITARY TEE AND OUTLET EFFLUENT FILTER SANITARY TEE. DEPTH TO TOP OF TANK FROM PROPOSED GRADE 15 APPROXIMATLEY 1'. 4" PVC EFFLUENT PIPE @ MIN. 1 %, USE SCHD-40 OR SDR -35 CONCRETE DISTRIBUTION BOX WITH BAFFLE INSTALLED LEVEL ON COMPACTED BASE INSTALL RISERS AND UD TO SURFACE L. 4" PVC DISTRIBUTION PIPES (TYP. 11111 ABSORPTION/TREATMENT FIELD USE 30 QUICK -4 CHAMBERS IN 2TRENCHES WITH 15 CHAMBERS PER ROW FOR A TOTAL ABSORPTION AREA OF 350 S.F. THE SYSTEM SHALL BE PLUMBED FOR EQUAL GRAVITY DISTRIBUTION. THE CHAMBERS SHALL BE INSTALLED ON LEVEL GRADE IN EACH TRENCH. THE BOTTOM OF EACH TRENCH TO BE EXCAVATED TO A MAXIMUM AVERAGE DEPTH OF 36 INCHES BELOW THE EXISTING SURFACE GRADES, WITHIN THE UPPER HORIZON OF THE NATIVE SILT LOAM SOILS & BACKFILLED WITH A MINIMUM 12 -INCHES OF COVER OVER THE CHAMBERS. THE FINISH GRADE ACROSS THE FIELD SHALL BE SLIGHTLY MOUNDED A MINIMUM 6 -INCHES ABOVE EXISTING ADJACENT GRADES. FIELD SITUATED 200+ FROM NEAREST WELL. 4" RISER PIPE INSPECTION PORT INSTALLED AT EACH END CHAMBER (TYP.) EXCAVATION DEPTH 1' MIN. -4' MAX. BELOW SURFACE GRADE MINIMUM. 12" COVER OVER TOP OF CHAMBERS ALL & GRADE FIELD AREA APPROXIMATELY 3"-6" ABOVE EXISTING SURFACE GRADES COFFMAN NORTHSIDE RANCH LLLP CATHERINE STORE RD - AKA CR 100 RIO GRANDE TRAIL ROARING FORK TRANSPORTATION AUTHORITY RAILROAD R.O.W. COFFMAN RANCH, LLC COFFMAN RANCH. LLC COFFMAN FAMILY TRUST PARCEL No.239336300276 4.293 ACRES PER COUNTY COFFMAN RANCH. LLC VINCINITY MAP OWTS _DESIGN PLAN CONNECT INDIVIDUAL 4" DISTRIBUTION PIPE TO HEAD OF EACH CHAMBER TRENCH (TYPICAL EACH TRENCH). INSTALL CONNECTION AS NEEDED FROM END OR SIDE INLET PORT OF EACH INFILTRATOR CHAMBER END CAP. CHAMBER END CAP CHAMBER END CAP CONNECTION DETAIL N.T.S. NATIVE, YARD OR LANDSCAPED SURFACE r „, . A 4" SOLID PVC GRAVITY DISTRIBUTION PIPES (TYP.) TO ABSORPTION FEILD EXCAVATED MATERIAL COMPACTED TO 90% STANDARD PROCTOR SUITABLE BACKFILL OR CLASS 6 ROAD BASE COMPACTED SUBGRADE TRENCH CROSS-SECTION FOR SDR -35.26 OR SCHD-40 PIPES N.T.S. '-DISTRIBUTION BOX LID AT GROUND SURFACE RISER SECTION BAFFLE 4" DISTRIBUTION GRAVITY LINE FROM SEPTIC TANK INVERT IN 8" AGREGATE BASE COURSE COMPACTED SUBGRADE DISTRIBUTION BOX DETAIL N.T.S. BACKFILL WITH SCREENED ONSITE SOILS FREE OF ROCKS IN EXCESS OF 3" DIAMETER FILTER FABRIC BACKFILL LAYER NATURAL ONSITE SOILS FREE OF ROCKS SCARIFY BOTTOM SURFACE AND PLACE CHAMBERS AT LEVEL GRADE. SILTY LOAM SOIL. CROWN FIELD TRENCH TO DIVERT SURFACE WATER 4" PVC INLET PORT IN END CAP 'rrXrAi VAIN i" o r A 4' Design Calculations OWTS The design flow is calculated as follows for a single family residence onsite wastewater treatment system (OWTS). The treatment capacity is designed for an equivalent 2 -bedroom residence. From the Regulation 43 usage table : 4 persons. Gallons per day per person =75 gal/person/day, No peaking factor Max. Design flow (Qd)gallons/day = (# of people) x (avg. flow)gal/person/day. Design flow Qd = 4*75=300 gpd Septic Tank Design: Use a 1000 gallon, two compartment concrete or reinforced plastic septic tank with an effluent filter outlet sanitary tee in the second compartment. Tank shall be installed with sealed plastic risers and fiber lids to the finish grade surface. Sub Surface Conditions and Testing: A subsurface soil investigation and site assessment was performed by Sopris Engineering in September, 2019. The soils in the proposed field envelope area were sampled and characterized by application of the USDA visual/tactile soil texture method analysis. The soils below 6 to 12 inches of topsoil consist of medium dense slightly sandy silt loam soil with less than 10% scattered gravels and cobbles to 8 feet below the surface grades. The deeper underlying soils are composed of culluvial loamy soils with gravels and cobbles. The soils appear to be consistent across the site from observations of excavations. The native soils sampled from 2-3 feet below the surface are characterized as a soil type 2 consisting of silt loam texture with granular structure. This soil has an effective loading rate for conventional soil treatment of 0.6 Gal/S.F./day for a level 1 conventional treatment system. The equivalent percolation rate is assumed to be 15-25 minutes per inch. No free water was encountered in excavations on site. Seasonal high Groundwater levels are expected to be below 20 feet from the existing surface grades. The soils are suitable for a shallow conventional shallow absorption field consisting of gravelless infiltration chamber units. Treatment -Soil Treatment Unit/ Absorption System Design: The treatment/absorption field is designed based on utilizing the effective Long Term Acceptance Rate (LTAR) for the native soils and the application of appropriate loading factors for a soil treatment unit system utilizing gravity distribution to gravelless chamber trenches. The new treatment system and absorption field will consist of gravity distribution of septic tank effluent via a distribution box to individual chamber trenches with treatment across the native soil absorptive surface. Long Term Acceptance Rate (LTAR) Considering the application of the state regulation 43: Receiving Wastewater Treatment Level 1; Soil type 2 loading rate for a silt loam is (0.6 gal./S.F./day).; Loading factors; (Table 10-2, Gravity application trenches = 1.0 ) and (Table 10-3, gravelless chambers = 0.7) A(sf) = ,: A = Area; LTAR LTAR = 0.6 Gal/S.F./day for silt loam Qd = flow (gal/day) = 450 gpd L.F.1=1.0 Gravity Distribution L.F.2=0.7 Chambers A(sf) = 300 gpd x 1.0 x 0.7 = 350 S.F. 0.6 Gal/S.F./day Number of quick -4 chambers: 350 S.F = 29 chambers Use 30 chambers 12 S.F./Chamber Use 30 Quick -4 chambers in two trenches 62' long by 3' wide with 15 chambers units per trench plus two end caps as delineated on the plan. The septic tank effluent will be gravity distributed to the head of each chamber row via individual distribution pipes from a distribution box. Additional soil evaluations will be performed during construction to verify the soils in the excavation trench excavations.. NOTE: ALL CHAMBERS IN EACH TRENCH MUST BE INSTALLED ON LEVEL GRADE OVER LEVEL SCARIFIED SURFACE. MAXIMUM DEPTH OF TRENCHES NOT TO EXCEED 36" BELOW PROPOSED FINISH SURFACE GRADES. INLET AND END CAPS ARE TO BE INSTALLED ON EACH END CHAMBER ROW. IF EXCESSIVE LARGE COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF THE EXCAVATION, OVER EXCVATE AND BACKFILL WITH SAND OR SUITABLE SCREENED NATIVE SOILS. CHAMBER TRENCH CROSS SECTION DETAIL N.T.S. GENERAL NOTES: 1. THE PROPOSED LOT CONDITIONS AND OWTS AS SHOWN ON THE PLAN AND THE DETAILS WERE DESIGNED BY SOPRIS ENGINEERING. 2. WELL INFORMATION : COLORADO DIV. OF WATER RESOURCES. 3. THE SURVEY/PLAT INFORMATION SHOWN IS BASED ON THE C,R,100 CARBONDALE, CO 81623, BY SCARROW & WALKER 2003 GEOREFERENCED BY SE. THE EXISTING TOPOGRAPHY, CONTOURS 2 FT INTERVALS GENERATED FROM LIDAR DATA, AND PARCEL INFORMATION FROM GARFIELD COUNTY GIS PREPARED BY SOPRIS ENGINEERING, MAY 2019. 4. APPLICANT/OWNERS NAME AND ADDRESS: GREGORY COFFMAN COFFMAN RANCH EXEMPTION 1837 C,R,100 CARBONDALE, CO 81623 <Ivarvee@gmail.com> 5. SITE ADDRESS: 1837 C,R,100 , CARBONDALE, CO 81623 6. Legal Summary. PARCEL 3 COFFMAN RANCH EXEMPTION 7. Parcel Number: 2393-363-00-276 8. GARFIELD COUNTY SEPTIC PERMIT #: SEPT -08-19-5912 ISSUED 9-9-19 9. CONTRACTOR: HOLMES EXCAVATION AND CONCRETE OWTS SYSTEM NOTES 1. ALL MATERIALS AND INSTALLATION SHALL CONFORM TO STATE AND COUNTY ONSITE WASTEWATER TREATMENT SYSTEM (OWTS) REGULATIONS. 2. IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO CONTACT ALL UTILITY COMPANIES FOR FIELD LOCATIONS OF UTILITIES PRIOR TO CONSTRUCTION AND EXCAVATION. 3. ALL SEWER LINES TO BE SDR -35 OR SCHEDULE 40 P.V.C. PIPE UNLESS NOTED OTHERWISE. 4. INSTALL A TWO-WAY CLEAN OUT ON THE SERVICE LINE FROM THE HOUSE AND AN ADDITIONAL CLEANOUT WITHIN 100' SECTION OF EFFLUENT DISCHARGE PIPE . 5. THE SEPTIC TANK SHALL BE INSTALLED LEVEL ON COMPACTED EARTH. INSTALL WATERTIGHT RISERS AS NECESSARY TO BRING ALL REQUIRED ACCESS POINTS TO THE FINISHED SURFACE GRADE. BACKFILL WITH SUITABLE NATIVE SOIL FREE OF BOULDER AND ROCK IN EXCESS OF 3" DIAMETER. 6. A SANITARY BAFFLE TEE IS REQUIRED ON THE SEPTIC TANK INLET AND OUTLET. INSTALL THE INLET AND OUTLET TEES PLUMB AND IN A POSITION TO ALLOW EASY INSPECTION AND MAINTENANCE OF TANK FROM THE TANK RISERS. 7. INSTALL A 4" EFFLUENT FILTER ON THE 4" OUTLET TEE OF THE SEPTIC TANK. THE FILTER SHOULD BE INSPECTED EVERY SIX MONTHS. THE EFFLUENT FILTER SHALL BE MAINTAINED AND CLEANED WHEN THE TANK IS PERIODICALLY PUMPED OR AS NECESSARY. INSTALL A SUITABLE EXTENSION ON THE FILTER WITH A HANDLE TO BE WITHIN 6" BELOW THE ACCESS LID. 8. THE CONTRACTOR SHALL ENSURE THAT THE SEWER LINES, SEPTIC TANK AND RISERS ARE WATERTIGHT. ALL PLUMBING FIXTURES AND OWTS COMPONENTS SHALL BE INSTALLED AND MAINTAINED TO AVOID SURFACE OR GROUNDWATER FROM ENTERING THE SYSTEM AND TO PREVENT LEAKAGE FROM THE SYSTEM. IN-HOUSE PLUMBING FIXTURES SHALL BE MAINTAINED TO PREVENT EXCESS WA TER FROM EN TERING THE SEP TIC SYSTEM. 9. THE DIMENSIONS AND NOTES SHOWN ON THE PLAN INDICATE MINIMUM AREA, LENGTH, WIDTHS AND SEPARATION DISTANCES FOR THE TRENCHES, BED OR MOUNDED ABSORPTION FIELD. 10. THE ABSORPTION TRENCHES SHALL BE EXCAVATED TO LEVEL GRADE IN NATIVE EARTH. THE TRENCH BOTTOM AND SIDEWALLS SHALL BE SCARIFIED AND/OR RACKED IF SMEARING OCCURS. IF EXCESSIVE LARGE COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF THE EXCAVATION OVER 6" FROM THE PROPOSED TRENCH BOTTOM SURFACE, OVER EXCAVATE AND BACKFILL WITH SAND. 11. THE LEACHING CHAMBERS SHALL BE INSTALLED LEVEL WITH A MINIMUM COVER OF 10 INCHES NOT TO EXCEED 24 INCHES. 12. LEACHING CHAMBERS WILL BE PLACED IN THE EXCAVATION OVER THE NATIVE SOIL OR SELECT SOIL REPLACEMENT OR ASTM -33 SAND LEVELING COURSE. END CAPS SHALL BE INSTALLED ON THE END CHAMBERS IN EACH TRENCH. 13. VERTICAL INSPECTION PORTS SHALL BE INSTALLED FROM THE PRE MARKED HOLE ON THE TOP OF EACH END CHAMBER CAP . (TYP. BOTH ENDS OF EACH ROW) THE PORTS MAY HAVE THREADED CAPS AT GRADE. 14. THE CHAMBERS WILL BE BACKFILLED WITH EXCAVATED MATERIAL VOID OF ROCKS, THE BACKFILL MATERIAL SHALL NOT EXCEED 2 1/2" DIAMETER AND SHALL BE PLACED TO AT LEAST 6 INCHES ABOVE THE TOP OF THE CHAMBERS. THE TOP OF THE PLACED BACKFILL SHALL BE COVERED WITH A LAYER OF FILTER FABRIC. A MINIMUM 4" DEPTH OF TOPSOIL IS TO BE PLACED ABOVE THE BACKFILL TO THE SURFACE & RE VEGETATED. 15. INSTALLATION OF LEACHING CHAMBERS SHALL BE IN CONFORMANCE WITH THE MANUFACTURES INSTALLATION INSTRUCTIONS. 16. THE ABSORPTION TRENCHES/BED OR MOUND MUST BE GENERALLY MARKED AT THE FOUR CORNERS WITH INSPECTION PORTS AND/OR BURIED REBAR. THE FIELDS MUST BE PROTECTED FROM VEHICULAR AND LIVESTOCK TRAFFIC. 17. THE ABSORPTION FIELD SURFACES MUST BE SLOPED OR SLIGHTLY MOUNDED TO DIVERT SURFACE DRAINAGE AWAY FROM THE FIELD. 18. THE ENTIRE ABSORPTION FIELD SURFACE MUST BE RE VEGETATED. 19. THE ABSORPTION FIELD SHALL BE INSTALLED PER THE REQUIRED SETBACK DISTANCES: 10 feet from any property line. 25 feet from any potable water supply line. 20 feet from any occupied dwelling. 100 feet from any well, spring or cistern. 100 feet from any stream or water course. DISTRIBUTION SYSTEM NOTES: 1. FILTERED EFFLUENT WILL DISCHARGE TO A CONCRETE DISTRIBUTION BOX WITH RISERS AND LID AT THE SURFACE. 2. THE DISTRIBUTION SYSTEM WILL BE INSTALLED TO ALLOW FOR EFFLUENT TO BE EQUALLY DISTRIBUTED TO THE ABSORPTION TRENCHES VIA INDIVIDUAL 4" DISTRIBUTION LINES CONNECTED TO THE HEAD OF EACH CHAMBER TRENCH. 3. THE MINIMUM SLOPE OF THE DISCHARGE LINE FROM THE TANK TO THE DISTRIBUTION BOX SHALL SHALL BE INSTALLED AT A MINIMUM 1% SLOPE. THE INDIVIDUAL DISTRIBUTION LINES AT THE HEAD OF THE TRENCHES SHALL BE INSTALLED AT A MINIMUM OF 2% SLOPE. TESTING. INSPECTIONS AND CONSTRUCTION MANAGEMENT: 1. ADDITIONAL GEOTECHNICAL EVALUATIONS AND INSPECTIONS BY THE ENGINEER SHOULD BE PERFORMED DURING INITIAL STAGES OF CONSTRUCTION TO VERIFY SOIL CONDITIONS AND OWTS DESIGN. SUFFICIENT NOTICE TO THE ENGINEER BY THE PROJECT MANAGER/CONTRACTOR NEEDS TO BE MADE IN ORDER TO SCHEDULE THE SITE INSPECTIONS. 2. PRIOR TO CONSTRUCTION OF THE PERMITTED SYSTEM THE ENGINEER SHOULD BE CONTACTED BY THE PROJECT MANAGER/CONTRACTOR WELL IN ADVANCE TO PROVIDE ADEQUATE TIME TO DISCUSS THE SYSTEM COMPONENTS WITH THE CONTRACTOR, ANSWER QUESTIONS, RESOLVE ANY CONFLICT ISSUES AND SCHEDULE INSPECTION SITE VISITS BASED ON CONSTRUCTION PROGRESS. 3. COUNTY REGULATIONS REQUIRE THAT THE DESIGN ENGINEERS OF RECORD PERFORM SITE INSPECTIONS OF THE PERMITTED SYSTEM DURING CONSTRUCTION AND PROVIDE "AS -BUILT" DOCUMENTATION OF THE INSTALLED SYSTEM TO THE COUNTY AFTER CONSTRUCTION IS COMPLETE. THE ENGINEER SHOULD BE CONTACTED AND NOTIFIED OF THE CONSTRUCTION SCHEDULE. 4. OUR DESIGN AND RECOMMENDATIONS ARE BASED OUR SITE ASSESSMENT, SOIL EVALUATION AND UPON INFORMATION SUPPLIED TO US BY OTHERS. IF SUBSURFACE OR SITE CONDITIONS ARE FOUND TO BE DIFFERENT FROM CONDITIONS ASSUMED OR INDICATED, WE SHOULD BE NOTIFIED TO EVALUATE ANY EFFECT ON THE PROPOSED OWTS. IF THE COUNTY REQUESTS CHANGES OR MODIFICATIONS TO THIS DESIGN, WE SHOULD BE CONTACTED TO EVALUATE AND RESPOND TO THE REQUEST. 5. CONTRACTOR SHOULD REVIEW ANY CONDITIONS ON THE ISSUED PERMIT AND COORDINATE WITH THE ENGINEER REGARDING CONSTRUCTION OF THE SYSTEM. 6. IF YOU HAVE ANY QUESTION OR NEED ANY ADDITIONAL INFORMATION, PLEASE CALL PAUL RUTLEDGE AT SOPRIS ENGINEERING, 704 0311. G:\2019\19204\CIVIL\Civil DWGs\DE\-19204-DE-OWTS.dwg w I- Q 0 CD J 1- z DESIGNED BY CHECKED BY J J z_ aC z_ z W (CIVIL CONSULTANTS 502 MAIN STREET CO N (D c7) 7 N- co O 79 V�o • 1` Q tio F). Z N- o) co • u_ U Lu I- 0 REVISION b Z GREGORY COFFMAN RESIDENCE 0 0 UQ W aC Q O 0 O z CO z < 0 U u O w N U CO ONSITE WASTEWATER TREATMENT SYSTEM PLAN BUILDING PERMIT CONSTRUCTION DOCUMENT DATE:SEPT 26, 2019 JOB NO. 19204.01 SHEET C1 Item # 1060 Callon Two Compartment IM 1060-2CP Infiltrator® Poly Tank 12 Top 0 ��I�I�Il1�,1 m l7 !Iii.. LJ R7 1? 1 7 F P 'y ti VIeW + is r o II Ii it li��II' o �� 7K a� TANK TOP HALF CONTINUOUS Iiii, �. _ 1• TANK �.T �, O o i� �, a INTERIOR SEAM CIDP I\, I0 'I a P �' I[�II' .1 L --ALIGNMENT - Jere = I1 III i ih ll,��irir, +Y:IiII ►IMINt,'fl Mid -Height HALF Seam 24E98OP@a#10 ■ Section Seclion pTank i'j'!.'"ijr 44' Inclues ow -LET lids 1 + 12F 4.7 • Compliant with CSA and IAPMO • PVC risers available ■ Secondary safety screen available • Maximum burial depth in 48" • Minumum burial depth is 5" Standards with SEAM CLIP PVC riser (TYPICAL) LIFTING STROP 1i EXTERIOR HEIGHT • Tank is not rated for vehicular • Exterior of manhole cover includes warning; "DANGER DO NOT GASES" traffic ENTER: loading (T) the following End POISON View Digging Specs invert Dimensions Net Weight -INFILTRATOR' - Capacity Cr 12' Longx 7 Wide Inlet 47" Outlet 44" Length 9 127" Width Height 9 62.2" 54.7" 3094- gol 320 Ihs ,rolls lark; ravaxiaceS1 os Bic. Water &O) 3 47 23005 Co. X317 Wastewater PA. Box 925 • Symms Buena Vie* C081211 o VALLEY . Pm uc s rax: (719) 395-3727T7 PRECAST, Inc. • Service %%bellK Www.valleyprecestcam Email: frontdeskravaileypteceacom NOTE: ALL CHAMBERS IN EACH TRENCH MUST BE INSTALLED ON LEVEL GRADE OVER LEVEL SCARIFIED SURFACE. MAXIMUM DEPTH OF TRENCHES NOT TO EXCEED 36" BELOW PROPOSED FINISH SURFACE GRADES. INLET AND END CAPS ARE TO BE INSTALLED ON EACH END CHAMBER ROW. IF EXCESSIVE LARGE COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF THE EXCAVATION, OVER EXCVATE AND BACKFILL WITH SAND OR SUITABLE SCREENED NATIVE SOILS. CHAMBER TRENCH CROSS SECTION DETAIL N.T.S. GENERAL NOTES: 1. THE PROPOSED LOT CONDITIONS AND OWTS AS SHOWN ON THE PLAN AND THE DETAILS WERE DESIGNED BY SOPRIS ENGINEERING. 2. WELL INFORMATION : COLORADO DIV. OF WATER RESOURCES. 3. THE SURVEY/PLAT INFORMATION SHOWN IS BASED ON THE C,R,100 CARBONDALE, CO 81623, BY SCARROW & WALKER 2003 GEOREFERENCED BY SE. THE EXISTING TOPOGRAPHY, CONTOURS 2 FT INTERVALS GENERATED FROM LIDAR DATA, AND PARCEL INFORMATION FROM GARFIELD COUNTY GIS PREPARED BY SOPRIS ENGINEERING, MAY 2019. 4. APPLICANT/OWNERS NAME AND ADDRESS: GREGORY COFFMAN COFFMAN RANCH EXEMPTION 1837 C,R,100 CARBONDALE, CO 81623 <Ivarvee@gmail.com> 5. SITE ADDRESS: 1837 C,R,100 , CARBONDALE, CO 81623 6. Legal Summary. PARCEL 3 COFFMAN RANCH EXEMPTION 7. Parcel Number: 2393-363-00-276 8. GARFIELD COUNTY SEPTIC PERMIT #: SEPT -08-19-5912 ISSUED 9-9-19 9. CONTRACTOR: HOLMES EXCAVATION AND CONCRETE OWTS SYSTEM NOTES 1. ALL MATERIALS AND INSTALLATION SHALL CONFORM TO STATE AND COUNTY ONSITE WASTEWATER TREATMENT SYSTEM (OWTS) REGULATIONS. 2. IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO CONTACT ALL UTILITY COMPANIES FOR FIELD LOCATIONS OF UTILITIES PRIOR TO CONSTRUCTION AND EXCAVATION. 3. ALL SEWER LINES TO BE SDR -35 OR SCHEDULE 40 P.V.C. PIPE UNLESS NOTED OTHERWISE. 4. INSTALL A TWO-WAY CLEAN OUT ON THE SERVICE LINE FROM THE HOUSE AND AN ADDITIONAL CLEANOUT WITHIN 100' SECTION OF EFFLUENT DISCHARGE PIPE . 5. THE SEPTIC TANK SHALL BE INSTALLED LEVEL ON COMPACTED EARTH. INSTALL WATERTIGHT RISERS AS NECESSARY TO BRING ALL REQUIRED ACCESS POINTS TO THE FINISHED SURFACE GRADE. BACKFILL WITH SUITABLE NATIVE SOIL FREE OF BOULDER AND ROCK IN EXCESS OF 3" DIAMETER. 6. A SANITARY BAFFLE TEE IS REQUIRED ON THE SEPTIC TANK INLET AND OUTLET. INSTALL THE INLET AND OUTLET TEES PLUMB AND IN A POSITION TO ALLOW EASY INSPECTION AND MAINTENANCE OF TANK FROM THE TANK RISERS. 7. INSTALL A 4" EFFLUENT FILTER ON THE 4" OUTLET TEE OF THE SEPTIC TANK. THE FILTER SHOULD BE INSPECTED EVERY SIX MONTHS. THE EFFLUENT FILTER SHALL BE MAINTAINED AND CLEANED WHEN THE TANK IS PERIODICALLY PUMPED OR AS NECESSARY. INSTALL A SUITABLE EXTENSION ON THE FILTER WITH A HANDLE TO BE WITHIN 6" BELOW THE ACCESS LID. 8. THE CONTRACTOR SHALL ENSURE THAT THE SEWER LINES, SEPTIC TANK AND RISERS ARE WATERTIGHT. ALL PLUMBING FIXTURES AND OWTS COMPONENTS SHALL BE INSTALLED AND MAINTAINED TO AVOID SURFACE OR GROUNDWATER FROM ENTERING THE SYSTEM AND TO PREVENT LEAKAGE FROM THE SYSTEM. IN-HOUSE PLUMBING FIXTURES SHALL BE MAINTAINED TO PREVENT EXCESS WA TER FROM EN TERING THE SEP TIC SYSTEM. 9. THE DIMENSIONS AND NOTES SHOWN ON THE PLAN INDICATE MINIMUM AREA, LENGTH, WIDTHS AND SEPARATION DISTANCES FOR THE TRENCHES, BED OR MOUNDED ABSORPTION FIELD. 10. THE ABSORPTION TRENCHES SHALL BE EXCAVATED TO LEVEL GRADE IN NATIVE EARTH. THE TRENCH BOTTOM AND SIDEWALLS SHALL BE SCARIFIED AND/OR RACKED IF SMEARING OCCURS. IF EXCESSIVE LARGE COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF THE EXCAVATION OVER 6" FROM THE PROPOSED TRENCH BOTTOM SURFACE, OVER EXCAVATE AND BACKFILL WITH SAND. 11. THE LEACHING CHAMBERS SHALL BE INSTALLED LEVEL WITH A MINIMUM COVER OF 10 INCHES NOT TO EXCEED 24 INCHES. 12. LEACHING CHAMBERS WILL BE PLACED IN THE EXCAVATION OVER THE NATIVE SOIL OR SELECT SOIL REPLACEMENT OR ASTM -33 SAND LEVELING COURSE. END CAPS SHALL BE INSTALLED ON THE END CHAMBERS IN EACH TRENCH. 13. VERTICAL INSPECTION PORTS SHALL BE INSTALLED FROM THE PRE MARKED HOLE ON THE TOP OF EACH END CHAMBER CAP . (TYP. BOTH ENDS OF EACH ROW) THE PORTS MAY HAVE THREADED CAPS AT GRADE. 14. THE CHAMBERS WILL BE BACKFILLED WITH EXCAVATED MATERIAL VOID OF ROCKS, THE BACKFILL MATERIAL SHALL NOT EXCEED 2 1/2" DIAMETER AND SHALL BE PLACED TO AT LEAST 6 INCHES ABOVE THE TOP OF THE CHAMBERS. THE TOP OF THE PLACED BACKFILL SHALL BE COVERED WITH A LAYER OF FILTER FABRIC. A MINIMUM 4" DEPTH OF TOPSOIL IS TO BE PLACED ABOVE THE BACKFILL TO THE SURFACE & RE VEGETATED. 15. INSTALLATION OF LEACHING CHAMBERS SHALL BE IN CONFORMANCE WITH THE MANUFACTURES INSTALLATION INSTRUCTIONS. 16. THE ABSORPTION TRENCHES/BED OR MOUND MUST BE GENERALLY MARKED AT THE FOUR CORNERS WITH INSPECTION PORTS AND/OR BURIED REBAR. THE FIELDS MUST BE PROTECTED FROM VEHICULAR AND LIVESTOCK TRAFFIC. 17. THE ABSORPTION FIELD SURFACES MUST BE SLOPED OR SLIGHTLY MOUNDED TO DIVERT SURFACE DRAINAGE AWAY FROM THE FIELD. 18. THE ENTIRE ABSORPTION FIELD SURFACE MUST BE RE VEGETATED. 19. THE ABSORPTION FIELD SHALL BE INSTALLED PER THE REQUIRED SETBACK DISTANCES: 10 feet from any property line. 25 feet from any potable water supply line. 20 feet from any occupied dwelling. 100 feet from any well, spring or cistern. 100 feet from any stream or water course. DISTRIBUTION SYSTEM NOTES: 1. FILTERED EFFLUENT WILL DISCHARGE TO A CONCRETE DISTRIBUTION BOX WITH RISERS AND LID AT THE SURFACE. 2. THE DISTRIBUTION SYSTEM WILL BE INSTALLED TO ALLOW FOR EFFLUENT TO BE EQUALLY DISTRIBUTED TO THE ABSORPTION TRENCHES VIA INDIVIDUAL 4" DISTRIBUTION LINES CONNECTED TO THE HEAD OF EACH CHAMBER TRENCH. 3. THE MINIMUM SLOPE OF THE DISCHARGE LINE FROM THE TANK TO THE DISTRIBUTION BOX SHALL SHALL BE INSTALLED AT A MINIMUM 1% SLOPE. THE INDIVIDUAL DISTRIBUTION LINES AT THE HEAD OF THE TRENCHES SHALL BE INSTALLED AT A MINIMUM OF 2% SLOPE. TESTING. INSPECTIONS AND CONSTRUCTION MANAGEMENT: 1. ADDITIONAL GEOTECHNICAL EVALUATIONS AND INSPECTIONS BY THE ENGINEER SHOULD BE PERFORMED DURING INITIAL STAGES OF CONSTRUCTION TO VERIFY SOIL CONDITIONS AND OWTS DESIGN. SUFFICIENT NOTICE TO THE ENGINEER BY THE PROJECT MANAGER/CONTRACTOR NEEDS TO BE MADE IN ORDER TO SCHEDULE THE SITE INSPECTIONS. 2. PRIOR TO CONSTRUCTION OF THE PERMITTED SYSTEM THE ENGINEER SHOULD BE CONTACTED BY THE PROJECT MANAGER/CONTRACTOR WELL IN ADVANCE TO PROVIDE ADEQUATE TIME TO DISCUSS THE SYSTEM COMPONENTS WITH THE CONTRACTOR, ANSWER QUESTIONS, RESOLVE ANY CONFLICT ISSUES AND SCHEDULE INSPECTION SITE VISITS BASED ON CONSTRUCTION PROGRESS. 3. COUNTY REGULATIONS REQUIRE THAT THE DESIGN ENGINEERS OF RECORD PERFORM SITE INSPECTIONS OF THE PERMITTED SYSTEM DURING CONSTRUCTION AND PROVIDE "AS -BUILT" DOCUMENTATION OF THE INSTALLED SYSTEM TO THE COUNTY AFTER CONSTRUCTION IS COMPLETE. THE ENGINEER SHOULD BE CONTACTED AND NOTIFIED OF THE CONSTRUCTION SCHEDULE. 4. OUR DESIGN AND RECOMMENDATIONS ARE BASED OUR SITE ASSESSMENT, SOIL EVALUATION AND UPON INFORMATION SUPPLIED TO US BY OTHERS. IF SUBSURFACE OR SITE CONDITIONS ARE FOUND TO BE DIFFERENT FROM CONDITIONS ASSUMED OR INDICATED, WE SHOULD BE NOTIFIED TO EVALUATE ANY EFFECT ON THE PROPOSED OWTS. IF THE COUNTY REQUESTS CHANGES OR MODIFICATIONS TO THIS DESIGN, WE SHOULD BE CONTACTED TO EVALUATE AND RESPOND TO THE REQUEST. 5. CONTRACTOR SHOULD REVIEW ANY CONDITIONS ON THE ISSUED PERMIT AND COORDINATE WITH THE ENGINEER REGARDING CONSTRUCTION OF THE SYSTEM. 6. IF YOU HAVE ANY QUESTION OR NEED ANY ADDITIONAL INFORMATION, PLEASE CALL PAUL RUTLEDGE AT SOPRIS ENGINEERING, 704 0311. G:\2019\19204\CIVIL\Civil DWGs\DE\-19204-DE-OWTS.dwg w I- Q 0 CD J 1- z DESIGNED BY CHECKED BY J J z_ aC z_ z W (CIVIL CONSULTANTS 502 MAIN STREET CO N (D c7) 7 N- co O 79 V�o • 1` Q tio F). Z N- o) co • u_ U Lu I- 0 REVISION b Z GREGORY COFFMAN RESIDENCE 0 0 UQ W aC Q O 0 O z CO z < 0 U u O w N U CO ONSITE WASTEWATER TREATMENT SYSTEM PLAN BUILDING PERMIT CONSTRUCTION DOCUMENT DATE:SEPT 26, 2019 JOB NO. 19204.01 SHEET C1