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Home My WebLink AboutOWTS Design Report 03.13.2017ALL SERVIGE' 33 Four Wheel Drive Rd Carbondale, CO 8t623 970.3094259 March 13, 2017 Chris Erickson chrisericksonart c@c mail.com Subsurface Investigation and Onsite Wastewater Treatment System Design 2 -Bedroom Residence + 1 Future Bedroom 5000 Cattle Creek Road Garfield County, Colorado Chris, Project No. C1274 ALL SERVICE septic, LLC performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 5.51 -acre property is located outside of Glenwood Springs, in an area where OWTSs and wells are necessary. Legal Description: Section: 12 Township: 7 Range: 88 Subdivision COTTONWOOD HOLLOW SUB. Lot: 13 Parcel ID: 2939-123-02-013 SITE CONDITIONS The property is currently undeveloped with the exception of a driveway and well. A 2 -bedroom residence is proposed on the western portion of the property. There is a private well located near the proposed residence. The well must be located at least 50 -feet from the proposed septic tank and 100 -feet from the proposed soil treatment area (STA). The sewer line must be encased within 50 -feet of the well (see Encasement Detail W2.0/5). The proposed STA location is a relatively flat, previously cleared area for a roadway. We are proposing to push the STA toward the uphill side of the clearing and grading the bed into the hillside for appropriate drainage over the STA. With the exception of this clearing, the property slopes steeply to the south toward Cattle Creek. A future 1 -bedroom additional dwelling unit (ADU) is contemplated for the property. SUBSURFACE The subsurface was investigated on March 7, 2017 by digging one soil profile test pit excavation (Test Pit). A mini -excavator was used to excavate the test pit. Only one test pit was excavated due the limited area available for the proposed STA. A visual and tactile soil analysis was completed by Carla Ostberg.1 The materials encountered in Test Pit #1 consisted of dark brown topsoil to 1 -foot, underlain by medium brown to tan caliche with angular rock to a maximum depth explored 8 -feet. No bedrock or groundwater was encountered. ' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 2 A tactile analysis of the soils was taken from Test Pit #1 at 2.5 -feet below grade. The soil formed a ball and a very weak ribbon less than 1 -inch before breaking. Soil structure shape was blocky, soil structure grade was moderate, and consistence was friable. Soil texture was more smooth than gritty. Rock content measured under 50% of the volume of the sample. STA sizing is based on Soil Type 2, Silt Loam with granular structure type and moderate structure grade. A long term acceptance rate (LTAR) of 0.6 gallons per square foot will be used to design the OWTS, in accordance with Table 10-1 Soil Type 2 presented in the Garfield County On -Site Wastewater Treatment System Regulations, adopted April 14, 2014. Test Pit #1 Topsoil layer Sidewall Sieved sample DESIGN SPECIFICATIONS Page 3 Design Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms = 450 GPD LTAR = 0.6 GPD/SF 450 GPD / 0.6 GPD/SF x 1.2 (gravity bed) x 0.7 (chambers) = 630 SF The new OWTS design is based on 3 -bedrooms. An average daily wastewater flow of 450 GPD will be used. A double -sweep clean out must be installed within 5 -feet of the residence. The sewer line must be encased (see Encasement Detail W2.0/5) within 50 -feet of the well. The sewer line will run down the driveway and must be minimum Schedule 40 in a trench bedded with screened rock or road base and covered with Blue Board insulation for protection from settling and freezing. This pipe must have a minimum 2% grade to the septic tank. The system installation will include a new 1000 -gallon, two-compartment concrete septic tank with an effluent filter on the outlet tee of the septic tank. The septic tank must be placed outside of any potential traffic area. If the septic tank will be subject to traffic loading, it must have an H-20 rated lid with cast iron manhole lids. The STA will consist of three rows of 18 `Quick 4' Infiltrator® chambers connected with a level manifold, for a total area of 648 square feet of infiltrative area. The infiltrative area may not exceed 4 -feet below native grade. The uphill side of the bed should be graded into the existing uphill slope to promote drainage over the STA. Backfill material must be 3 -inch minus and must be able to support vegetation. Inspection ports must be installed at both the beginning and end of each row of chambers. These ports may be cut to grade and covered with a sprinkler box for access. 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. Page 4 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 irritation 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 OVVTS shall be responsible for maintaining proper vegetation cover. OPERATION INFORMATION AND MAINTENANCE The property owner shall be responsible for the operation and maintenance of each OWTS servicing the property. The property owner is responsible for maintaining service contracts for manufactured units, alternating STAs, and any other components needing maintenance. Geo -fabrics or plastics should not be used over the absorption area. No heavy equipment, machinery, or materials should be placed on backfilled STAs. 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 OVVTS. 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. INSTALLATION OBSERVATIONS ALL SERVICE septic, LLC 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. ALL SERVICE septic, LLC should be notified 48 hours in advance to observe the installation. Page 5 LIMITS: The design is based on information submitted. If soil conditions encountered are different from conditions described in report, ALL SERVICE septic, LLC 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, ALL SERVICE septic, LLC Owl (et Os -1- 6tAis, Carla Ostberg, MPH, REHS Reviewed By: Item # 1000T-2CP 1000 Galion Top Seam Two Compartment Top View Section View 106" Digging Specs Invert 11' Long x T Wide *Meets ASTM C-1227 spec 56' below Inlet invert Including C-1644-06 for resilient connectors • 6000 psi concrete • Delivered complete with intemal piping • PVC, poly or concrete risers available • Option of pump or siphon installed Inlet 56' Outlet 53' Dimetlsloris Length: Width Height 111" 60' 68' Net Capacity Inlet Side Outlet Side Total 687 gallons 323 gallons 1,010 gallons Net Weight Lid Tank 1 Total 2,620 lbs 9,380 lbs 1 12,000 Ibs Water & [719) 3984764 28005 Co. Ind. 317 Wastewater P.O. &D(925 VALLEY • Systems Fax. (719) 3&�r372T Buena Vista, 0081211 • Products 1fVebslEe: www.velleyprer�mlco ❑ PRECAST,Inc. • Service Ema1l: frontdesiravalleyixecastoom Residential Biotube® Effluent Filters Applications Our patented* 4 -in. (100 -mm) Biotube Effluent Filters, Biotube Jr., Biotube Insert Filters, and Biotube Base Inlet Filters are ideal for residential septic tanks and have a lifetime warranty. They prevent large solids from leaving the tank, dramatically improving wastewater quality and extending the life of residential drainfields. 4 -in. (100 -mm) Biotube Effluent Filter [' 4 -in. (100 -mm) Biotube Jr. (4 -in. Biotube cartridge avail- able separately as Insert Filter) -r 8 -in. (200 -mm) Base Inlet Filter L• 4 -in. (100 -mm) Insert Filter f te Orenco's superior effluent filters resist clogging better than all other brands. Our stan- dard, full-sized 4 -in. (100 -mm) Biotube Effluent Filter provides maximum long-term protection in a complete package, with housing. Our 4 -in. (100 -mm) Biotube Jr., at half the size of our standard model, has more filtering capacity than the fill -sized filters sold by other manufacturers. For tanks with existing outlet tees, the Biotube Insert Filter is ideal. And for low profile tanks, there's the Base Inlet Filter. * Covered by patent numbers 5,492,635 and 4,439,323 To Order Call your nearest Orenco Systems®, Inc. distributor. For nearest distribu- tor, call Orenco at 800-348-9843 or go to www.orenco.com and click on "Distributor Locator." APS -FT -1 Rev. 3.4 ® 11/10 Orenco Systems®, Inc. Standard Features & Benefits • Has 5-10 times more flow area than other brands, so lasts many times longer between clean- ings, increasing homeowner satisfaction • Installs in min- utes inside new or existing tanks; extendible tee handle for easy removal Optional Features & Benefits • Alarm available, to signal the need for cleaning • Flow modulating discharge orifices available to limit flow rate leaving tank, mitigat- ing surges and increasing retention time • Custom and commercial sizes available • Easy to clean by simply hosing off whenever the tank needs pumping • Removes about two-thirds of sus- pended solids, on average, extending drainfield life • Corrosion -proof construction, to ensure long life • Lifetime warranty Biotube Filtering Process Effluent from the relatively clear zone of the septic tank, between the scum and sludge layers, horizontally enters the Biotube Effluent Filter. Effluent then enters the annular space between the housing and the Biotubes, utilizing the Biotubes' entire surface for filtering. Particles larger than the Biotube's mesh are prevented from leaving the tank. a�+ Orenco Systems' Incorporated Charging the Way the World Does lguretuercr" www.orenco.com Nomenclatures 4 -in. Biotube Filter (standard) Fri] = 041110-[ I Options: Blank = no options M = flow modulation plate installed A - float bracket attached Cartridge height: 28" and 36" are standard Housing height: 36" and 44" are standard Filter diameter (inches) W = fits Type 3034 outlet pipe S = fits Schedule 40 outlet pipe Blank = 1/8" filtration P = 1/16" filtration Biotube effluent filter series 8 -in. Biotube Filter (base inlet model) FT 08 22 -14 B —TOptions: A = float bracket FS = 2" outlet orifice FSO = 2" outlet orifice and overflow plate* Base inlet model Cartridge height: 14" standard Housing height: 22" standard Filter diameter (inches) 08 = 8" Blank = 1/8" filtration P = 1/16" filtration Biotube effluent filter series * Also available with coupling and sleeve as a "kit": FT-OVERFLOWKIT 4 -in. Biotube Jr. (includes cartridge and housing) FT J ❑ IJ 04 18 Options: Blank = no options M = flow modulation plate installed A = float bracket attached Cartridge height (inches) Filte diameter (inches) fi s Type 3034 outlet tee fi s Schedule 40 outlet tee W= s= Blank = 1 8" filtration P = 1 16" filtration Junior series Biotube effluent filter series 4 -in. Biotube Filter Insert (cartridge only) FT i 04 18 -❑ For customized options (e.g., NC indicates North Carolina regions) W = fits Type 3034 outlet tee S = fits Schedule 40 outlet tee Cartridge height (inches) Filte diameter (inches) Blank = 1/8" filtration P = 1/16" filtration Insert Biotube effluent filter series 4 -in. Biotube Effluent Filter Extendible PVC handle f `Stainless steel set screws' 4 -in. Biotube Jr. Top seal plate Air vents ` Biotube® filter cartridge Solid base Filter housing Tank wall 7-7 rC Distributed By: 0' 65' 130' Scale: 1" = 130'-0" PROPOSED 2 -BEDROOM RESIDENCE MIN. 50' TO TANK MIN. 100' TO STA r MJiny, raerrva..1 Peril aa4e Reception Na 4]073370732 Lot 13 5.514Anesx Pwithr,Nnec QMii LL ti VIVI i6-auAww- wne. rrArlMum 04.hax,YWMo — r- — — — �� ,,, n. —. — / / Cellinuwei Maw A& i / — WNmneaam i aiaplmtea Rom — I r n SITE PLAN leatramt - County Road No_1- 13--------- r L"op ISM.. N Sma Ra7•MWasi]i pibnfer Comer f„f PROPOSED 2 -BEDROOM RESIDENCE 0 4" D#EH=40"{MIN. UNDER ~ - -i RIVEWAY) SEWER LINE WITH DOUBLE -SWEEP CLEANOUT (MIN. 2% SLOPE TO TANK)). 1 I DRAWINGS MUST BE USED IN CONJUNCTION WITH DESIGN LETTER DATED 03/12/17 0 -TE: ENCASE SEWER LINE WITHIN 50' OF WELL, RE: 5/W2.0 1000 -GALLON, TWO-COMPARMTENT, CONCRETE SEPTIC TANK WITH EFFLUENT SCREEN ----POSITION SEPTIC TANK OUTSIDE—OF-TRA -FIC AREA QUICK -4' CHAMBER BED. 3 ROWS OF 18 CHAMBERS = 54 HAMBERS = 648 SF Power Pole PROPOSED STA lJ 1• - 2O-_ 4" DIA SDR -35 LEVEL MANIFOLD 4" DIA SDR -35 SEWER PIPE TO EACH ROW (MIN. 1% FALL) 011111111111•111111•11011M111111112:11•1111111, 0111111111111MINIIIMMININ11111111 MEW MINIM 1111111111•110 A Survey Control Site Benchmark Elev. =6623.7' INSPECTION PORT AT BEGINNING AND END OF EACH ROW 0' 10' 20' Scale: 1" = 20'-0" ALL ilNVlil 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com Erickson Residence 5000 Cattle Creek Road Garfield County, Colorado Project Number: C1274 Date: 03/12/17 Designed By: CBO Reviewed By: RHP Drawn By: ANG W1.0 Sheet 1 of 3 4" DIA SDR -35 EFFLUENT PIPE (MIN. 1% FALL FROM TANK) 4" DIA SDR -35 PVC LEVEL MANIFOLD SLIP-ON PVC CAP DO NOT GLUE INSULATED COPPER TRACER WIRE FINISHED GRADE 4" DIA SDR -35 SEWER LINE TO EACH TRENCH (MIN. 1% SLOPE TO TRENCH) INFILTRATOR END PLATE GRAVELLESS 'QUICK -4' CHAMBER (4' x 3') PIPES PLACED IN TOP PORT OF CHAMBER END PLATES 4" DIA SDR -35 SEWER LINE TO TANK TO HOUSE r Ct CLEANOUT DETAIL NOY-To SCALE 72' 18 CHAMBERS PER ROW 0 STA PLAN NOT TO SCALE 4" DIA SDR -35 INSPECTION PORT AT BEGINNING AND END OF EACH ROW SMALL VALVE COVER BOX OR IRRIGATION VALVE BOX AT GRADE ATTACH CAP OR THREADED CLEANOUT ASSEMBLY r COMPACT SOIL ' 341 BORE TO SUPPORT Art USE HOLE SAW TO CUT THRU TOP OF END PLATE 4" PVC PIPE CUT TO FIT INSPECTION PORT NOT DETAIL STA SECTION NOT TO SCALE GRADE BED INTO UPHILL SLOPE FOR PROPER RUNOFF 4" DIA SDR -35 INSPECTION PORT BEGINNING AND END OF EACH ROW. MAY BE INSTALLED BELOW GRADE IN A VALVE BOX —1' MIN. SCARIFY SURFACE, STA MUST BE LEVEL SCHEDULE 40 ENCASEMENT PIPE SCH 40 RIGID END CAP AT EACH END OF PIPE 4" DIA SDR -35 SEWER LINE. MUST REST ON BOTTOM OF ENCASEMENT PIPE ENCASEMENT DETAIL Nor to SCALE END CAP MUST BE GLUED OR SECURED IN A WATER TIGHT FASHION WITH UNDERGROUND SEALANT HOLE DRILLED IN END CAP MUST ONLY BE LARGE ENOUGH TO ALLOW SEWER LINE TO FIT THROUGH 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com Erickson Residence 5000 Cattle Creek Road Garfield County, Colorado Project Number: C1274 Date: 03/12/17 Designed By: CBO Reviewed By: RHP Drawn By: ANG W2.0 Sheet 2 of 3 DESIGN 2 -BEDROOM RESIDENCE + 1 FUTURE BEDROOM (75 GAUPERSON/DAY x 2 PERSONS/BEDROOM x 3 BEDROOMS) WASTEWATER FLOW = 450 GALLONS TANK: 450 X 48 HOUR RETENTION TIME = MIN. 900 GALLONS USE 1000 -GALLON, TWO-COMPARTMENT SEPTIC TANK SOIL TREATMENT AREA (STA): LONG TERM ACCEPTANCE RATE (LTAR) = 0.6 GAU SQ FT CALCULATED STA = Q/LTAR = 450 / 0.6 = 750 SF GRAVITY BED = 750 SF X 1.2 = 900 SF CHAMBERS = 900 SF X 0.7 = 630 SF / 12 SF / CHAMBER = 53 CHAMBERS GRAVELLESS CHAMBER BED 3 ROWS OF 18 'QUICK 4' INFILTRATOR CHAMBERS TOTAL 54 'QUICK 4' CHAMBERS — 0 — 1 — 2 --- 3 w 4 w w_ — 5 w 6 — 7 — 8 — 9 — 10 SOIL PROFILE TEST PIT NO. 1 DARK BROWN TOPSOIL MEDIUM BROWN TO TAN CALICHE (SOIL TYPE 2) WITH MODERATE STRUCTURE GRADE AND ANGULAR ROCK LEGEND Iq topsoil Fi caliche NO GROUNDWATER OR BEDROCK ENCOUNTERED DURING EXCAVATION SOIL LOG NOT TO SCALE 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com Erickson Residence 5000 Cattle Creek Road Garfield County, Colorado Project Number: C1274 Date: 03/12/17 Designed By: CBO Reviewed By: RHP Drawn By: ANG W3.0 Sheet 3 of 3