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HomeMy WebLinkAboutEngineer's Report 05.22.201533 Four Wheel Drive Rd Carbondale, CO 81623 970-309-5259 REF 11 May 22, 2015 Simon Bentley Crawford Design Build cbdsimon& comcasLnet Onsite Wastewater Treatment System Design 4 -Bedroom Residence 110 Sopris Lane Garfield County, Colorado Simon, Project No. C1148 ALL SERVICE septic, LLC has completed an onsite wastewater treatment system (OWTS) design for the subject residence. The property is located outside of Carbondale, in an area where OWTSs are necessary. Legal Description: Callicotte Ranch Subdivision, Lot 18, Amended #754313 SITE CONDITIONS The property is currently undeveloped. A 4 -bedroom, 3575 square foot residence is proposed. The subdivision is served by a community water system. Water lines must be greater than 25 -feet from any OWTS component. The proposed STA location has approximately an eleven percent slope to the southwest across the proposed soil treatment area (STA). There are no potential future land use changes or bedroom additions planned for the property. SUBSURFACE The subsurface was investigated by running percolation tests on February 25, 2015 by HP Geotech. The investigation is documented in a letter dated March 6, 2015 under Job No. 115 035A. A soil profile pit was also excavated as part of the subsurface investigation. Percolation test results are documented between 20 and 30 minutes per inch, with percolation test holes having a depth between 32 and 36 -inches. A soil profile pit was excavated to a maximum depth explored of 8 -feet. No bedrock or groundwater was encountered. The gradation and hydrometer analysis performed by HP Geotech shows the soil consists of 4% gravel, 31% sand, 47% silt, and 18% clay. The USDA soil type is classified as Loam, STA sizing is based on Soil Type 2A, Loam. A long term acceptance rate (LIAR) of 0.5 gallons per square foot will be used to design the OWTS, in accordance with Table 10-1 presented in the Garfield County On -Site Wastewater Treatment System Regulations, adopted April 14, 2014. Page 2 DESIGN SPECIFICATIONS The OWTS design is based on 4 -bedrooms_ An average daily wastewater flow of 450 GPD will be used_ DesignCalculations: Average Design Flow = 75 gal/day x 2 people/ bedroom x 3 bedrooms + 75 gallons (4th bedroom) = 525 GPD LTAR = 0.5 GPD/SF 525 GPD / 0.5 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 735 SF The system installation will include a 1250 -gallon, two-compartment concrete septic tank an effluent filter on the outlet tee of the septic tank. Effluent will gravity flow to a distribution box, which must be accessible from grade. Flow regulators must be utilized to assure equal flow to each outlet of the distribution box. The STA will consist of five rows of 13 'Quick 4' Infiltrator® chambers for a total area of 780 square feet of infiltrative area. The infiltrative area may not exceed 4 -feet below native grade. There must be at least 6 -feet of undisturbed soil between the trenches. Inspection ports must be installed at both the beginning and ends of each trench. 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 Garfierd County Building Department, and this design. 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 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 property owner is responsible for maintaining service contracts for manufactured units, altemating 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. 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. Page 3 ADDITIONAL CONSTRUCTION NOTES If design includes a pump, air release valves and 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 backfin, 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. 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 (iv, Ccs L r)6- -h Carla Ostberg, MPH, REHS Reviewed By: Richard H. 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C1148 Item # 1250T-2CP 1250 Gallon Top Seam Two Compartment ALLOWABLE BURY (Based on Water Table) WATER TABLE EARTH FILL EARTH 0' - 0' 2 - 0' 1'-0' 3' -or 2'- 0' 3'- Or 3'- O' 4'- 0' DRY 4'-O' 135" Section DESIGN NOTES View • Design per performance test per ASTM C1227 • Top surface area 56.25 it' • fc @ 28 days; concrete = 6,000 PSI Min. Installation: • Tank to be set on 5" min. sand bed or pea gravel • Tank to be bacidlled uniformly on all sides In lifts less than 24' and mechanically compacted • Excavated material may be used for back ill, provided large stones are removed • Excavation should be dewatered and tank filled with water prior to being put in service for Installation with water table less than 2' below grade • Meets C1644-06 for resident connectors • Inlet and Outlet identified above pipe • Delivered complete with internal piping • PVC or concrete risers available • Secondary safety screen available with PVC riser • Option of pump or siphon Installed 'See installation guide on our website Dlggirng Specs Invert Dimensions 13' Long x T Wide Inlet Outlet Length Width Height 56" below inlet invert 56" 53" 135" 60" 68" Net Inlet Side Outlet Side Total 843 gallons 418 gallons 1,259 gallons Net Weight Lid Tank Total 3,120 lbs 10,880 lbs 14,000Ibs Water & (719) 395.6764 29005 Co. Rd. 317 Wastewaf�sr P.O. Bot 925 o VALLEY • Systems BuemVbda, 0081211 • ystel:tS Fax (719) 395-3727 PRECAST, inc. • Service Weblike: www.valleyprecaet.com Ema11:frontdesleavalleYPrecastcom 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 Iarge solids from Ieaving the tank, dramatically improving wastewater quality and extending the life of residential drainfields. 4 -in. (100 -mm) Biotube Effluent Filter 'PCI 4 -in. 000 -mm) Biotube Jr. (4 -in. Biotube cartridge avail- able separately as Insert Filter) 8•in. (200 -nim) Base Inlet Filter 4 -in. (100 -mm) Insert Filter 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 fr. at half the size of our standard model bas morefiltering capacity than the full-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. • Covcrcd by patent numbers 5.491635 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 Rei. 3.4 011/10 Omen Systeme, 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. asp Orenco Systems Incorpora'eo Changing she ti ty the Mold AM t .men uter www.orenco.com Nomenclatures 4 -in. Biotube Filter (standard) FT000400-00 I Options: Blank = no options M = flow modulation plate installed A = float bracket attached Cartridge height: 28' and 36" aro standard Housing height: 36" and 44' are standard Alter diameter (inches) W = fits Type 3034 outlet pipe S = fits Schedule 40 outlet pipe Blank = 118" filtration P = 1116' filtration Blotrme effluent filter series 8 -in. Biotube Filter (base inlet model) FT 0 08 22-14 B Optlons A = float bracket FS - 2" outiet orifice FSG = 2' outlet orrice and overflow pl:itt_" Base inlet mode Cartridge height 14" standard Housing height: 22' standard Ther diameter (inches) 08 = B' Blank = 1/8" filtration P = 1116' filtration Biotube effluent fitter series ` Also avallabia with coupling and sleeve as a "kit` FT OVEEFLOWI4T 4 -in. Biotube Jr. (includes cartridge and housing) FT.! 0004 18 I Options: Blank = no options M = flow modulation plate installed A = float bracket attached Cartridge height (inches) Filter diameter (inches) W = Ills Type 3034 outlet tee S = tits Schedule 40 outlet tee Blank = 1/8" filtration P = 1116' filtration Junior series Biotube effluent filter series 4 -in. Biotube Filter Insert (cartridge only) FT 0 0418 -0- For customized options (e.g. NC indicates North Carolina regions) W = filsType 3034 outlet lee 5 = fits Schedule 40 outlet tee Cartridge height (inches) Filter diameter (inches) Blank = 118" filtration P = 1116" filtratdo i Insert Biotube effluent fitter series 4 -in. Biotube Effluent Filter Extendible PVC handle 4 -in. Biotube Jr. Stainless steel set screws Top seal plate Air vents Biotube® filter cartridge Solid base — Riser t wall Filter housing — — Tank wall Distributed By: LI 0 10 Fe' CO _1 1:0 < re CCE LIJ 0! C:73 (7 CO LI- ("•! IA (NI 0 u, ttcL E oN.-1 4 -am 1111..-1 r c="