The URL can be used to link to this page

Home My WebLink AboutOWTS Design Packet 10.04.202033 FOUR WHEEL DRIVE ROAD CARBONDALE, CO 81623 ... 970.309.5259 CAR LA.OSTB ERG@GMAI L.COM r October 4, 2020 Emily VanBuskirk 970eavCcgmaii.com Subsurface Investigation and Onsite Wastewater Treatment System Design 4-Bedroom Residence 277 CR 277 (Miller Lane) Garfield County, Colorado Emily, Project No. C1559 CBO Inc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 2.69-acre property is located outside of Silt, in an area where OWTSs and wells are necessary. Legal Description: Section: 6 Township: 6 Range: 92 A TR IN THE E1/2SE. Parcel I D : 2179-064-00-251 SITE CONDITIONS A 4-bedroom, single-family residence presently exists and is utilizing and existing OWTS. The OWTS consists of a 1250-gallon, 2-compartment Copeland Concrete septic tank followed by a 3-foot deep gravel system measuring either 12' x 51' or 18' x 34'. Garfield County Individual Sewage Disposal System Permit 1480 documents this system. The permit received final approval from Garfield County on November 17, 1987. The soil treatment area (STA) is experiencing signs of surface saturation and there is a desire to upgrade the system. The residence is served potable water from a well located approximately 20-feet north of the residence. There is also a well on the neighboring property to the east. The existing septic tank is greater than 50- feet from both wells and the proposed STA will be greater than 100-feet from both wells. While the location of the well on the neighboring property has been approximated, we field verified a distance of 100-feet at the time of our soil investigation. The proposed STA location is relatively flat. The area will be staked off so as not to be subject to livestock traffic. There should be no traffic or staging of material over the future STA site to avoid compaction of soils prior to construction of the STA. SUBSURFACE The subsurface was investigated on September 28, 2020 by digging two soil profile test pit excavation (Test Pit). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.' ' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 2 The materials encountered in Test Pit #1 consisted of medium brown silt loam to a maximum depth explored of 8.0-feet. No bedrock or groundwater was encountered. The materials encountered in Test Pit #2 were consistent with those in Test Pit #1. Test Pit #2 was excavated to a maximum depth explored of 8.0-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. 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 smooth than gritty. STA sizing is based on Soil Type 2, Silt Loam with moderate structure grade. A long term acceptance rate (LTAR) of 0.6 gallons per square foot will be used to design the OWTS. Sieved sample weak ribbon Page 3 Test Pit #2 Page 4 DESIGN SPECIFICATIONS The existing 1250-gallon, two -compartment septic tank may remain in use. An inlet sanitary tee, effluent filter on the outlet tee, and 6-inch risers must be installed to bring access to grade. The existing STA will be abandoned in place. 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 525 GPD / 0.6 GPD/SF x 1.2 (gravity bed) x 0.7 (chambers) = 735 SF The new 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 the sewer line exiting the existing septic tank as 100' (approximately 1.5' below native grade). CBO Inc. should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. OWTS Component j Minimum Elevation Distribution Box Infiltrative Surface Approximate horizontal distance 88' / min. 1% fall / min. 22" fall Approximate horizontal distance 5' / min. 1% fall / j min. 0.625" fall A double -sweep clean out must be installed on the sewer line just before entering the septic tank. An inlet tee, effluent filter, and 6-inch risers must also be installed on the septic tank. Page 5 Effluent will gravity flow to a level manifold connecting four rows of 13 'ARC' ADS chambers for a total of 52 chambers and 780 square feet of infiltrative area. We recommend using Schedule 40 sewer pipe between the septic tank and STA because horses are kept in this area. Infiltrative area may not exceed 4-feet below grade. Inspection ports must be installed at each corner of the bed. Ports may be cut to grade and placed in sprinkler boxes for access. The STA must be fenced off to eliminate the chance of traffic from livestock. COMPONENT SPECIFICATIONS The component manufacturers are typical of applications used by contractors and engineers in this area. CBO Inc. 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. COMPONENT MANUFACTURER Chambers ARC ADS® MODEL NO. COMMENTS Standard The component manufacturers are typical of applications used by contractors and engineers in this area. Alternatives may be considered or recommended by contacting our office. Construction must be according to Garfield County On -Site Wastewater Treatment System Regulations, the OWTS Permit provided by Garfield County Building Department, and this design. INSTALLATION CONTRACTOR CBO Inc. expects that the installer be experienced and qualified to perform the scope of work outlined in this design. The installer must review this design thoroughly and coordinate with our office in advance of installation. Any additional conditions in this design or county permit must be completed and documented prior to final approval of the OWTS installation. Communication between the installer and this office is expected throughout the installation. INSTALLATION OBSERVATIONS CBO Inc. 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 Inc. should be notified 48 hours in advance to observe the installation. In 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 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. 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. Page 6 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. If an effluent filter or screen has been installed in the OWTS, we recommend this filter or screen be cleaned annually, or as needed. If 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 If 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 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. LI MITS: The design is based on information submitted. If soil conditions encountered are different from conditions described in report, CBO Inc. should be notified. All OWTS construction must be according to the county regulations. Requirements not specified in this report must follow applicable county regulations. The contractor should have documented and demonstrated knowledge of the requirements and regulations of the county in which they are working. Licensing of Systems Contractors may be required by county regulation. Please call with questions. Sincerely, CBO Inc. eaiii(elCam. to Carla Ostberg, MPH, REHS 0 25' 50' SCALE 1 = 50'=0" I i DRAWINGS MUST BE USED IN CONJUNCTION WITH DESIGN LETTER DATED 10/04/2020 �ioo — 4-BEDROO RESIDENCE 0 SITE PLAN BM 10 STA WELL TP 2 • i TP 1 100' 1 r-PROPERTY LINE '''''''''''-APPROXIMATE LOCATION OF NEIGHBORS WELL THE LOCATION OF EXISTING AND PROPOSED IMPROVEMENTS SHOWN ARE NOT THE RESULT OF A PROPERTY SURVEY. THE LOCATIONS ARE APPROXIMATE. IT IS THE HOMEOWNERS' DUTY TO ENSURE ALL CONSTRUCTION AND IMPROVEMENTS LOCATIONS ARE ACCURATE. PROPERTY UN ES AND SETBACK DISTANCES SHOULD BE CONFIRMED PRIOR TO EXCAVATION. SCALED FOR PRINTING ON 11"X 17' PAPER. 1 t CBO Inc. 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostber9 @g mail.com VanBuskirk Residence 277 CR 277 Garfield County, Colorado Project Number. C1559 Date: 10/04/2020 Designed by: CBO Reviewed by: RB Drawn by: DD W1.0 Sheet 1 OF 4 I I I i i 1 i N 0 15' 30' SCALE: 1" = 30'-0" 7 4-BEDROOM RESIDENCE r DRIVEWAY EXISTING 1250-GALLON SEPTIC TANK TO REMAIN. ADD INLET TEE, EFFLUENT FILTER, AND 6" RISERS 4" DIA SCH 40 SEWER LINE TO STA (MIN. 1% SLOPE TO STA) �PROPOSCD OWTS i EXISTING SEWER LINE TO REMAIN. ADD DOUBLE SWEEP CLEANOUT IN FRONT OF SEPTIC TANK TP 1 PROPERTY UN 4" DIA SDR-35 PVC LEVEL MANIFOLD TTP 2 afj Olt • RC ADS CHAMBER BED. 4 ROWS OF 13 67 int CHAMBERS = 52 CHAMBERS = 780 SF IRO � Raft � •.rr4 N APPROXIMATE LOCATION OF NEIGHBOR'S WELL -121- 4' DIA SDR-35 INSPECTION PORT AT EACH CORNER OF STA NH -PROPERTY LINE 0' MIN CBO Inc. 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com VanBuskirk Residence 277 CR 277 Garfield County, Colorado Project Number. C1559 Date: 10/04/2020 Designed by: CBO Reviewed by: RB Drawn by: DD W2.0 Sheet 2 OF 4 4' SDR 35 PVC INSPECTION PORT AT EACH CORNER OF STA EXTENT O EXCAVATION 4' DIA SCH 40 EFFLUENT PPE IM1N, I'A FALL FROM SEPT1 TANK) 4' DIA SOR-35 PVC LEVEL MANIFOLD SCARIFY SURFACE °CHAMBER BED SECTION 'ti:J •' DIA SDR-35 SEWER UNE /.-•-• TO EACH TRENCH (MIN. 1%SLOPE TO TRENCH) END PLATE ARC ADS CHAMBERS, 3'X5' r GRAVEI I.ESS'AIC' ADS / CHAMBERS (3' x 5') igIMMEMI MEM UM MEW AIIIIMENEMMENEW :5 13 CHAMBERS PER ROW PePES PLACED IN TOP PORT OF CHAMBER END PLATES 00-1AWSER BED PLAN 2 __ 4' DIA SDR-35 INSPECTION PORT AT EACH CORNER OF STA SLIP-ON PVC CAP DO NOT GLUE INSULATED COP)'E TRACER WIRE Fl NISHED GRADE 4' DIA SDR-35 SEWER LINE TO TANK TO HOUSE O CLEIHOUT DETAILS OWL COMPACT SO BASE TO SUPPORT BOX USE HOLE SAW TO CUT THRL TOP OF END PLATF. SMALL VALVE COVER BOX OR IRRIGATION VALVE BOX AT GRADE ATTAC?I CAP OR THREADED CLEANOUT ASSEMBLY a'PVC PIPE CUT TO FIT °INSPECTION PORT IN CHAMBER 101,11 NYC FINISHED GRSDE • 4" DIA SCH 40 SEWER LINE (MIN 1%TO STA) SCREENED ROCK OR SAND FOR BEDDING 24" MIN. 3' MIN a' MIN 0 TRE3dCl4 SETNitr,nini CBO Inc. 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com VanBuskirk Residence 277 CR 277 Garfield County, Coiorado Project Number. C1559 Date: 10104,2020 Designed by: CHO Reviewed by: RB Drawn by: OD W3.0 Sheet 3 OF 4 DESIGN 4-BEDROOM RESIDENCE 75 GPD x 2 PERSONS/BEDROOM x 3 BEDROOMS +75 GPD 4TH BEDROOM) WASTEWATER FLOW = 525 GPD TANK; MIN. 1250 GALLONS USE EXISTING 1250-GALLON, TWO -COMPARTMENT CONCRETE SEPTIC TANK SOIL TREATMENT AREA (STA): LONG TERM ACCEPTANCE RATE (LTAR) = 0.6 GAU SF CALCULATED STA = Cl/LTAR = 525 / 0.6 = 875 SF GRAVITY, BED = 875 SF X 1.2 = 1050 SF CHAMBERS = 1050 SF X 0.7 = 735 SF / 15 SF / CHAMBER = 49 ARC ADS CHAMBERS CHAMBER BED 4 ROWS OF 13 'ARC' ADS CHAMBERS TOTAL 52 ARC ADS CHAMBERS — 0 --- - 1 — 2 — - 3 — - 4 — - 5 --- 6 — 7 — - 8 — - 9 — 10 SOIL PROFILE TEST PIT NO. 1 MEDIUM BROWN SILT LOAM NO GROUNDWATER OR BEDROCK ENCOUNTERED DURING EXCAVATION OWTS COMPONENTS AND PHYSICAL FEATURES MINIMUM REQUIRED SETBACK APPROXIMATE PROPOSED SETBACK HOUSE TO SEPTIC TANK 5' 38' SEPTIC TANK TO WELL 50' 101' SEPTIC TANK TO EAST WELL 50' 117' STA TO HOUSE 20' 128' STA TO WELL 100' 191' STA TO EAST WELL 100' 105' SOIL PROFILE TEST PIT NO. 2 MEDIUM BROWN SILT LOAM c>SIYLS LQG LEGEND F. silt loam CBO Inc. 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com VanBuskirk Residence 277 CR 277 Garfield County, Colorado Project Number. C1559 Date: 10/04/2020 Designed by: CBO Reviewed by: RB Drawn by. DD W4.0 Sheet 4 OF 4 gPublic.net Garfield County, CO Overview E Legend L] Parcels --- Roads Parcel/Account Numbers Highways 01* Limited Access *^ Highway - Major Road Local Road — Minor Road Other Road Ramp Ferry - Pedestrian Way Owner Name Lakes & Rivers County Boundary Line Account Number R210058 Physical Address 277 MILLER LN 2019 Total Actual Value $284,920 Last 2 Sales RIFLE 81650 Date Price Acres 3 Owner Address VANBUSKIRK, EMILY 7/17/2020 $260,000 Land SgFt 0 277 MILLER LANE 11/21/2016 $385,000 Parcel Number 217906400251 Tax Area 021 RIFLE CO81650 2019 Mill Levy 63.9580 Date created:10/4/2020 Last Data Uploaded:10/3/2020 2:06:14 AM Developed bv411 Schneider 3f o'iPA TIAL 4 GARFIELD COUNTY BUILDING AND SANITATION DEPARTMENT 2014 Blake Avenue Glenwood Springs, Colorado 81601 Phone (303) 945.8241 INDIVIDUAL SEWAGE DISPOSAL PERMIT +fl Owner_ Steve L. Wboleey System Location Licensed Installer 1480 0277 County Road 227 Rifle, Colorado This does not constitute I a building or use permit. Owner P.O. Box 335 Silt, Colorado 81652 876-2479 . Conditional Construction approval is hereby granted for a /400 gallon -optic Tank or Aerated treatment unit. Absorption area (or dispersal area) computed as follows: 7 Perc rate of one inch in . minutes requires a minimum of C.) sq, ft. of absorption area per bedroom, Therefore the no. of bedrooms 3 x 2-u4•-sq ft minimum requirement a a total of COO 4q ft of absorption area. J May we suggest / ZD( / X 3G`r Ive J� C7 I /51 X - �? .F p •� /r 1 v n� • r.. L Date. FINAL APPROVAL OF SYSTEM: ti Inspector No system shall be deemed to be in compliance with the Sewage Disposal Laws until the assembled system is approved prior to cover- ing any part, Septic Tank access for inspection and cleaning within 12" of ground surface or aerated access ports above ground / surface. Proper materials and assembly. r Trade name of septic tank or aerated treatment unit. Lori' I Jr Date Adequate absorption (or dispersal) area. Adequate compliance with permit requirements. Adequate compliance with County and State regulations/requirements. ____ Other 110 ( f Inspector RETAIN WITH RECEIPT RECORDS AT CONSTRUCTION SITE "CONDITIONS: 1. All installation must comply with all requirements of the County Individual Sewage Disposal Regulations, adopted pursuant to au- thority granted in 66.44-4. CRS 1963, amended 66-3-14, CRS 1963, 2. This permit is valid only for connection to structures which have fully complied with County zoning and building requirements. Connection to or use with any dwelling or structures not approved by the Building and Zoning office shall automatically be a viola- tion of a requirement of the permit and cause for both legal action and revocation of the permit. 3. Section 111, 3.24 requires any person who constructs, alters, or installs an individual sewage disposal system in a manner which in. volves a knowing and material variation from the terms or specifications contained in the application of permit commits a Ctass 1, Petty Offense (SS00.00 fine -- 6 months in jail or both). Applicant: Groan Copy Departrnant: Pink Copy W rrrlaararrrA+rr�rrrrra�r r�arraar�r • PERMIT REQUEST FOR: (k) New Installa Attach separate sheets or report showin topography of area, habitable building, test holes, soil profiles in test holes LOCATION OF PROPOSED FACILITY: County Near what City of Town Cam? I,L—T— Legal Description WASTES TYPE: ( k) Dwel l tng GROUND CONDITIONS: Depth to bedrock: Depth to first Ground Water Table: Percent ground slope: DISTANCE TO NEAREST COMMUNITY SEWER SYSTEM:t.- Was an effort made to connect to community system? /r] OWNER ADDRESS CONTRACTOR ( gyp) N ADDRESS PHONE INDIVIDUAL SEWAGE DISPOSAL SYSTEM APPLICATION Cr5 PHONE U7(q'7.' Approval by County Official: tion ( ) Alteration ( ) Repair g entire area with respect to surrounding areas. location of potable water wells, soil percolation (See page 4.-)) dfl O1 Lot Size 1 G 5 Ac., ( ) Transient Use ( ) Commercial or Institutional ( ) Non -domestic Wastes ( ) Other - Describe_ BUILDING OR SERVICE TYPE:-- Number of bedrooms ._ (1- Number of persons ( ) Garbage grinder (D4 Automatic washer ( ) Dishwasher SOURCE AND TYPE OF'WATER SUPPLY: ( DC) well ( ) spring ( Give depth of all wells within 180 feet of system: If supplied by community water, give name or supplier: ) 9. stream or creek TYPE OF INDIVIDUAL SEWAGE DISPOSAL SYSTEM PROPOSED: ( ) Septic Tank ( ) Vault Privy ( ) Pit Privy ( ) Chemical Toilet FINAL DISPOSAL BY: ( ) Aeration Plant ( ) Composting Toilet ( ) Incineration Toilet ( ) Other - Describe: ( ) Absorption Trench, Bed or Pit ( ) Underground Dispersal ( ) Above Ground Dispersal ( ) Other - Describe: WILL EFFLUENT BE DISCHARGED DIRECTLY INTO WATERS OF THE STATE? ( ) Vault ( ) Recycling. potable use ( ) Recycling, other use ( ) Evapotranspiration ( ) Sand Filter ( ) Wastewater Pond SOIL PERCOLATION TEST RESULTS: (To be completed by Registered Professional Engineer.) Minutes per inch in hole No. 1 Minutes per inch in hole No. 3 Minutes per inch in hole No. 2 Minutes per inch in hole No. Name. address and telephone of RPE who made soil absorption tests: Name, address and telephone of RPE responsible for design of the system: Applicant acknowledges that the completeness of the application is conditional upon such further mandatory and additional tests and reports as may be required by the local health department to be made and furnished by the applicant or by the local health department for purposes of the evaluation of the application; and the issuance of the permit 4.s•subject to such terms and conditions as deemed necessary to insure compliance with rules and regulations adopted under Article 10, Title 25, C.R.S. 1973. as amended. The undersigned hereby certifies that all statements made, information and reports submitted herewith and required to be submitted by the applicant are or will be represented to be true -and correct to the best of my knowledge and belief and are designed to be relied on by the local department of health in evaluating the same for purposes of issuing the permit applied for herein. I further under- stand that any falsification or misrepresentation may result in the denial of the application or revocation of any permit granted based upon said application and in legal action for per- jury as provided by law. Date \ \\ � 1 crc �] PLEASE DRAW AND ACCURATE MAP TO YOUR PROPERTY i Page 3 PEAT PLAN AND DESIGN FEATURES: Include by measured distance location of wells, springs. potable water supply lines, cisterns, buildings, property lines, subsoil drains, lake, water course, stream, dry gulch and show location of proposed system by direction and distance from dwelling or other fixed reference object, and additional submissions in Support of this application such as data, plans, specifications. statements and commitments. sF� P AAC�r� END CAP FRONT VIEW C 2016 ADS, INC END CAP SIDE VIEW 34.5" END CAP REAR/TOP VIEW 63.25" rrL-ru c'fri ee/ } 60" J H II ll RENAMED DESCRIPTION TJR 03/16/16 BY MM/DD/YY CHK'D ADVANCED DRAINAGE SYSTEMS. INC. CADS) HAS PREPARED THIS DETAIL BASED ON INFORMATION PROVIDED TO ADS. THIS DRAWING IS "GENIE) TO DEPICT THE COMPONENTS AS REQUESTED. ADS ETAS NOT PERFORCE➢ ANY ENGBIEERING OR DESIGN SERVLCF FOR THIS PROJECT. NOR kiAS ADS INDEPENDENTLY VERIFIED THE INFORMATION SUPPLJED. 111E INSTALLATION DETAILS PROVIDED HERE N ARE OOIERAJ. RECOMMENDATIONS AND ARE NOT SPECIFIC FOR THIS PROJECT. THE DESIGN EHCINEEER STALL REVIEW THESE DETALLS Pfe0R TO CONSTRUCTION. IT IS THE DESIGN ENGINEERS RESPONSIBILITY TO ENSURE THE DETNI.S PROVIDED NUCON MEETS OR EXCEEDS THE APPUCABLE NATIONAL, STATE, CR LOCAL REQUIREMENTS AND TO ENSURE THAT THE DETAILS PROVIDED HEREIN ART: AR PTABLE FOR THIS PROJECT. DRAWING NUMBER: STD-904 ETC r 5.15.07 7)A w NTS "� 1OF1