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HomeMy WebLinkAboutEngineer's Design Report 08.28.2015ALL Nur 33 Four Wheel Drive Rd Carbondale, CO 81623 970-309-5259 August 28, 2015 Project No. C1169 Eddie Liebowitz Skifaster28@hotmail.com Subsurface Investigation and Onsite Wastewater Treatment System Design 2 -Bedroom Residence Lot 1, Crystal Peaks Development Garfield County, Colorado Eddie, ALL SERVICE septic, LLC performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The property is located in Missouri Heights, in an area where OWTSs and wells are necessary. SITE CONDITIONS The property is currently undeveloped with the exception of a driveway and a well. A 2 -bedroom, single- family residence is proposed. The private well located on the property will be greater than 50 -feet from the proposed septic tank and greater than 100 -feet from the proposed soil treatment area (STA). The proposed STA location has approximately a ten percent slope across the proposed STA. The proposed STA is covered with sage and other native vegetation. There are no potential future land use changes planned for the property. The OWTS has been sized to accommodate a 3 -bedroom residence in case of a bedroom addition to the residence in the future. Well location View of property Page 2 SUBSURFACE The subsurface was investigated on August 18, 2015 by digging three soil profile test pit excavations (Test Pits). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.' The materials encountered in the Test Pit #1 consisted of dark brown, moist topsoil to 12.0 -inches, underlain by medium brown silty clay loam to 3.5 -feet, underlain by light brown to tan, dense caliche to a maximum depth explored of 7.5 -feet. No bedrock or groundwater was encountered. The materials encountered in Test Pit #2 were consistent with those encountered in Test Pit #1. The test pit was excavated to a maximum depth explored of 7.5 -feet. No bedrock or groundwater was encountered. The materials encountered in Test Pit #3 consisted of dark brown, moist, silty clay loam to 2.5 -feet, underlain by light brown to tan caliche to a maximum depth explored of 8.0 -feet. No groundwater or bedrock was encountered. A tactile analysis of the soils was taken from Test Pit #1 at 3 -feet below grade. The soil formed a ball and a ribbon 1 to 2 -inches in length before breaking. The soils had blocky structure shape, strong structure grade, and an extremely firm consistence. Soils were smooth in texture. A tactile analysis was taken below 3.5 -feet and formed a ball and a ribbon 1 to 2 -inches in length before breaking. The soils had granular to blocky structure shape, moderate structure grade, and a friable consistence. Soils were smooth in texture. A tactile analysis of the soils was taken from Test Pit #3 at 3 -feet below grade. The soil formed a ball, but no ribbon. Soils had granular to blocky structure shape, weak structure grade, and friable consistence. We propose locating the STA in the area of Test Pit #3. STA sizing is based on Soil Type 2. 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 Backfill Test Pit ' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Silty Clay Loam Caliche Test Pit #2 Test Pit Caliche Page 3 Page 4 DESIGN SPECIFICATIONS Design Calculations: Average Design Flow = 75 x 2 x 3 Bedrooms = 450 GPD LTAR = 0.6 GPD/SF 450 GPD / 0.6 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 525 SF The OWTS design is based on 3 -bedrooms. An average daily wastewater flow of 450 GPD will be used. The system installation will include a new 1000 -gallon, two-compartment concrete septic tank with an effluent filter installed on the outlet tee. Effluent will gravity flow to a distribution box, which must be accessible from grade. The STA will consist of three rows of 15 `Quick 4' Infiltrator® chambers for a total of 45 chambers and 540 square feet of infiltrative area. Trenches must have at least 6 -feet of undisturbed soil between them. Chambers must be installed in the caliche horizon; at least 2 -feet feet below grade and no greater than 4 -feet below grade. Trenches should follow contour lines. Inspection ports must be installed at both the beginning and end of each trench. Paris may be cut to grade and covered with a sprinkler box. 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. 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, 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 OWTS. Mechanical room drains should not discharge into the OWTS. The OWTS is engineered for domestic waste only. Page 5 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. 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 Oak (-)Ed--S, Carla Ostberg, MPH, REHS Reviewed By: 0 o co _ _ = w } § & m m 0 0 7®0--, (D & 2- ° ng/z 3G/2 SSE$ \ -/ 3 q= w 691.1.0 :JogwnN loafoad aouap!sazwogan 1740 1 leegS 91./1.Z/90 :algia 0 0 0 NV1d 111S 964/9 aeltla 121131 z> \\ z %\ )§ \j 00 z2 epos of loN :epos 0 1 n CA v v W ^^� O p 71 O 1J O C v CO o - -1 v (D W ( �< �. 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Box925 O VALLEY •• Produce Fax: (719) 395_3727 Buena Vista, CO81211 PRECAST,Inc. • Service Website: www.valleyprecastcom Email: frontdeskkvalleyprecastcom 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 r 4 -in. (100 -mm) Biotube Jr. ( (4 -in. Biotube cartridge avail- able separately as Insert Filter) 8 -in. (200 -mm) Base Inlet Filter 4 -in. (100 -mm) Insert Filter ,111 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 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. * 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. o Orenco Systems" Incorporated Changing the Way the World Does Waaewater® www.orenco.com 1 Nomenclatures 4 -in. Biotube Filter (standard) FT 04 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 Options: 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 Filte 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) FTJ 04 18 Options: Blank = no options M = flow modulation plate installed A = float bracket attached Cartridge height (inches) Filte diameter (inches) fits Type 3034 outlet tee fits 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) FTi 0418 - 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 4 -in. Biotube Jr. Stainless steel set screws Top seal plate Air vents Biotubefilter cartridge )Q Q( Solid base — Riser a wall Filter housing Tank wall Distributed By: Item # DBox 8C Concrete Distribution Box (1 inlet, 7 outlets) & Riser Top View 1 15" 12" d d 4 4 End View Riser Section 28" 4 12" 4 4 d 4 4 4 ° d d 4 d Side View nock Down Baffle 12" End View Section View 28" 25" 14" Ij\ 5" 28" `11/2u Lid View • 6000 PSI Concrete • 7 Outlet equal flow • Slide -in Baffle • 4" Pipe penetration ports • Connectors cast into the box • 12" Riser available Weight: D -Box with Baffle - 200 lbs D -Box Lid - 75 lbs D -Box Riser -140 lbs Water & Wastewater P.O. Banc (719) 395-6764 28005 925Ra 317 C0 • Systems lir VALLEY . Products Fax: (719) 395-3727 Buena vim' 81211 PRECAST, Inc. • Service Website: www.valleyprecastcom Email: frontdesk a©valleyprecast.com THIS WEIR SHAPE IS SELF LEVELING THESE RIBS PROVIDE FRICTION FIT FOR ALL 4" PIPE ID 1.73 .09 [4.4cm -.2 cm - 9 1.05 2.7 cm 11 1111111E! GEAR AND RACK PROVIDES POSITIVE ONE TIME LEVELING POLYLOK EQUALIZER PART NO. - 3049 MATERIAL - FILLED POLYPROPYLENE