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HomeMy WebLinkAboutDesign Packet 04.23.202033 FOUR WHEEL DRIVE ROAD CARBONDALE, CO 81 623 970.309.5259 CARLA.OSTBERG@GMAI L. COM til?Y'1'I(' ('ONtii?LTINC: April 23, 2020 Tyko Isaacson Tyko.isaacson(c�usda.gov Subsurface Investigation and Onsite Wastewater Treatment System Design 3-Bedroom Residence 312 Hwy 325 Garfield County, Colorado Tyko, Project No. C1520 CBO Inc. performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The 2.23-acre property is located outside of Rifle, in an area where OWTSs and wells are necessary. Legal Description: Section: 31 Township: 5 Range: 92 A TR OF LAND IN LOT 1. Parcel ID: 2127-312-00-008 SITE CONDITIONS A 3-bedroom, single-family residence presently exists and is utilizing an existing OWTS. There were no documents on the OWTS available from Garfield County, likely due to age. An inspection of the OWTS was conducted by Downvalley Septic and Drain on April 10, 2020. Their findings indicated the septic tank was made of wood and in poor condition. It should be noted that prior to purchasing this property, you (the current owner) were provided an inspection report from H&K Trucking out of Parachute. This inspection indicated the septic tank was concrete and in good condition. Both inspection reports are enclosed. The existing septic tank is located close to Rifle Creek. This septic tank will be abandoned. The residence is served potable water by a private well on the property. The well was not identified on the survey; however, we observed a well at the time of our site visit and have approximated it on our site plan. The well is located greater than 50-feet from the proposed septic tank and greater than 100-feet from the proposed soil treatment area (STA). Well view of well location, looking east toward Rifle Creek Page 2 Rifle Creek runs along northeast portion of the property. The proposed OWTS components will be located greater than 50-feet from Rifle Creek. A shallow ditch bisects the property, flowing from west to east. The portion of the ditch south of the residence is encased on concrete. The ditch was not flowing at the time of our site visit. This ditch was not indicated on the survey and we have approximated the location on our site plan. The sewer line will cross under the encased portion of the ditch. See W3.0/5 Encasement Detail. The ditch is open to the east of the gate to the pasture. The STA must be at least 50-feet from the open portion of the ditch. The proposed STA location is slightly downgradient and approximately 70-feet south of the residence in a pasture. The area is relatively flat and covered with native grasses. A small grove of trees is located to the west of the proposed STA. 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 April 20, 2020 by digging two 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 Test Pit #1 consisted of light brown clay loam with moderate structure grade to 3.5-feet, underlain by light brown clay loam with weak structure grade to a maximum depth explored of 7.0-feet. Digging became difficult due to the hard pack nature of the soils. No bedrock or groundwater was encountered. Similar conditions were encountered in Test Pit #2. The test pit was excavated to a maximum depth of 7.0-feet. No bedrock or groundwater was encountered. A tactile analysis of the soils was taken from Test Pit #1 at 3-feet below grade. Soil structure grade below 3.5-feet was weak. The soil formed a ball and a ribbon 1 to 2-inches in length before breaking. Soil structure shape was blocky and consistence was firm. Soil texture was both gritty and smooth. STA sizing is based on Soil Type 3A, Clay Loam with weak structure grade. A long term acceptance rate (LTAR) of 0.3 gallons per square foot will be used to design the OWTS. ' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 3 Test Pit #1 Sieved sample ribbon 1 to 2-inches in length Page 4 Structure grade below 3.5-feet weak Page 5 Beginning of Test Pit #1 backfill DESIGN SPECIFICATIONS The existing septic tank must be pumped and the top and sides collapsed and the remaining void filled with onsite material. It must be verified that all domestic wastewater plumbing in the residence is routed to the OWTS (showers, toilets, sinks, laundry, etc). There is drywell located to the north of the residence. We are not aware of what this drywell serves. Design Calculations: Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms = 450 GPD LTAR = 0.3 GPD/SF 450 GPD / 0.3 GPD/SF x 1.2 (gravity bed) x 0.7 (chambers) = 1260 SF The new OWTS design is based on 3-bedrooms. An average daily wastewater flow of 450 GPD will be used. For the purposes of this OWTS design, Benchmark Elevation at grade 100' has been established as the elevation of the existing sewer line at the clean out (2-feet below native grade). CBO Inc. should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. Page 6 OWTS Component Minimum Elevation Primary Tank Inlet Invert 100' (elevation of existing sewer line) Distribution Box Min. 100' (approx. 130' distance, min. 1 % fall = min. 16.25" drop) Ground elevation at distribution box location 100' (2' lower than ground elevation at residence) Infiltrative Surface Min. 99' 6" (approx. 10' distance, min. 1% fall = min. 1.25" drop) The 4-inch diameter, SDR-35 sewer line exiting the residence must have a double -sweep clean out and a minimum 2% grade to the septic tank. The system installation must include a 1000-gallon, two -compartment poly septic tank with an effluent filter on the outlet tee. We have specified an Infiltrator® poly septic tank; however, this may be substituted by any state -approved poly septic tank. Risers must bring the manhole lids to grade for access. If more than one riser is added to the septic tank, an extension handle must be installed on the effluent filter. The sewer line to the distribution box will be plumbed under a shallow irrigation ditch encased in concrete. The sewer line must be encased in 6-inch diameter Schedule 40 sewer line 10-feet on each side of the ditch. See W3.0/5 Encasement Detail. Effluent will gravity flow to a distribution box, and then to two gravelless chamber beds. The distribution box must be accessible from grade and must have flow equalizers, or similar product, installed on each outlet pipe in the distribution box to assure equal flow to each bed. Each bed will consist of 4 rows of 13 `Quick 4' Standard Plus Low Profile Infiltrator® chambers for a total of 104 chambers and 1248 square feet of infiltrative area. This is slightly short of the required square foot calculations (1 %, which is negligible). ARC ADS Low Profile chambers may be substituted for the specified `Quick 4' chambers. If ARC ADS Low Profile chambers are used, there must be 4 rows of 11 ARC ADS chambers for a total of 88 chambers and 1320 square feet. There must be at least 6-feet of undisturbed soil between each bed. Inspection ports must be installed at the beginning and end of each trench. Ports may be cut to grade and placed in sprinkler boxes for access. The area of the STA in the pasture should be fenced off to protect it from any large livestock traffic. Page 7 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 MODEL NO. COMMENTS Septic Tank Infiltrator® IM-1060-2CP 1000-gallon, 2- compartment poly septic tank Biotube Effluent Filter Orenco® Full Size Effluent Filter and housing Tank Risers and Lids Orenco® Double -walled PVC Risers and Lids (24" diameter) Distribution Box Concrete or poly, needs min. 2 outlets and risers Flow Equalizers 3049 Equalizer 2 Flow Equalizers Low Profile Chambers Infiltrator® 104 `Quick 4' Plus Standard Chambers 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 Page 8 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. 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. LIMITS: 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. Page 9 Please call with questions. Sincerely, CBO Inc. ems, (eL o��s, Carla Ostberg, MPH, REHS woo 11ew6@a 6Jeg4so epeo -0v wn c000 m CO 0_ �v of 0 m o 0 N �. 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ON IId 1S31 311302id 11OS ON 1Id 1S31 3113O2id 110S 0 \ 1 0 m z 0 0 > 0 O e { 0 0 \ m 32iIM 2i30V I hr 1= FAB Ir / & 7a 3C1V2i0 a3HSI 213dd00 a31V1fSNl 3l10 _ON Od dVO OAd NO-df1S 0 0 z Down Valley Septic & Drain PO Box 1967 Rifle, CO 81650 970-930-0124 msco0508@gmail.com ISDS INSPECTION CUSTOMER NAME: TYKO ISAACSON DATE: APRIL 10, 2020 ADDRESS: 312 HWY 325, RIFLE CO TYPE OF TANK: WOODEN, 1250 GALLON LOCATON OF TANK: 48' FROM CLEANOUTS CLEANOUTS: 3 CONDITION OF TANK: BAD CONDITION # OF LIDS: NONE DEPTH OF LIDS: 18" TO WOOD ON TANK TOP CONDITION OF LIDS: ROTTEN, UNSAFE # OF RISERS: N/A INLET T: NONE OUTLET T: NONE LEVELS OF LIQUID AT T'S: NIA BAFFLES: N/A SLUDGE THICKNESS: VERY THICK LEECHFIELD LOCATION: UNKNOWN LEECHFIELD TYPE: UNKNOWN/NONE LEECHFIELD WORKING: UNKNOWN/NO RECOMMENDATIONS: REPLACE CURRENT WOOD TANK AND LEECHFIELD. CURRENT HOMEMADE TANK IS 8-10' FROM FLOWING CREEK CREATING A HEALTH AND SAFETY RISK. DOWN VALLEY SEPTIC & DRAIN, INC. IS NOT RESPONSIBLE BEFORE, DURING OR AFTER THIS INSPECTION, H & K Trucking PO Box 301 Parachute CO 81635 Kamron@hktrucking.net hank@hktrucking.net Office: 970-285-7271 Hank: 970-309-9700 Fax: 970-285-9123 Kamron: 970-250-1769 Ticket No. J 2 2 19 J Date:V% " i Customer: '"fI) s I�l Address: 1I2 91,'jlf 3 / IOrdered By: State: 6, 0 Zip: ! 6 s o City: k if/ t Well / Job Name: j Rig: Driver: yy'' (Truck: fI Mileage. Origin: 'I.G A Destination: j/fry ,, (/l TYPE OF SERVICE PROVIDED ❑ PRODUCTION WATER ❑ WATER HAULING J OTHER (EXPLAIN) C::7 ❑ LOE WATER MANAGEMENT ❑ DRILL MUD r t . r. c 1.4es2 -C.a /--- ❑ CONDENSATE ❑ WATER ROADS 1 ❑ FRAC WATER ❑ MAG CHLORIDE ❑ FLOW BACK WATER ❑ DUMP TRUCK Ni Check Box That Describes Type Of Service Provided DESCRIPTION OF SERVICE PROVIDED BBLS HOURS ' . f J lPi c r' �' /. - -- , ,� i ,"' vt,`r- ; / ; �d� , r . ,! c%r> �7 v •r t-. r / Li5./v.t7 = ;,w. DRIVER: ; L Signature must be' legible H&K Trucking P.O. Box 301 Parachute, CO 81635 Item # IM 1060-2CP 1060 Gallon Two Compartment Infiltrator® Poly Tank 622' 127' 0 24' ACCESS OPENING 127' -tmi# Vito 0 • Compliant with CSA and IAPMO Standards • PVC risers available • Secondary safety screen available with PVC riser • Maximum burial depth is 48" • Minumum burial depth is 6" • Tank is not rated for vehicular traffic loading • Exterior of manhole cover includes the following warning: "DANGER DO NOT ENTER: POISON GASES" Digging Specs Invert TANK TOP HALF TANK INTERIOR ALIGNMENT DOWEL (34) CONTINUOUS GASKET SEAM CLIP (64) TANK BOTTOM HALF Mid -Height Seam Section allectlen- Viot* Tank includes lids OUTLET SEAM CLIP (TYPICAL) LIFTING STRAP (TYPICAL) Dimensions 12' Long x 7' Wide Inlet 47" Outlet 44" Length 127" Width 62.2" Net Capacity Height 54.7" 1094 gal Weight 320 lbs 54.7 EXTERIOR HEIGHT End View INFILTRATOR' septic tanks 1041000104* Water & Wastewater VOrVALLEY • P uy PRECAST, Inc. • service (719) 3954764 28005 Co. Rd. 317 P.O. Box 925 Fax: (719) 395-3727 Buena Yam' CO 81211 Website: www.valleyprecastcom Email: frontdesk a�vaiieyprecastcom 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) 8-in. (200-mm) 4-in. (100-mm) Base Inlet Filter 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 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. Cal Orenco Systems" I ncorporated Changing the Way the World Does Wastewater° www.orenco.com W= s= 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) FT J 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 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 )000( Solid base — Riser a wall Filter housing Tank wall / Distributed By: 4HD2 6HD2 Lr▪ i 'O ( • 8.95 ) Materials: Injection molded high density polyethylene plastic THIS WEIR SHAPE IS SELF LEVELING THESE RIBS PROVIDE FRICTION FIT FOR ALL 4" PIPE ID 1.73 [4.4 cm .09 -.2cm- i1 1.05 12.7 cm GEAR AND RACK PROVIDES POSITIVE ONE TIME LEVELING POLYLOK EQUALIZER PART NO. - 3049 MATERIAL - FILLED POLYPROPYLENE TOP VIEW SIDE VIEW 48" (EFFECTIVE LENGTH) *ALL VIEWS = INSTALLED LENGTHS INFILTRATOR SYSTEMS INC. QUICK4 PLUS STANDARD LOW PROFILE CHAMBER PRODUCT SPECIFICATION (NOT TO SCALE) INSPECTION PORT END VIEW 8" QUICK4 PLUS ALL -IN -ONE END CAP 8" 3.3" INVERT��18rr�� QUICK4 PLUS END CAP 10.4" EFFECTIVE LENGTH* 13.3" EFFECTIVE LENGTH* H- 4.5" EFFECTIVE LENGTH* .III 3.3" INVERTT1-0-18"--17 6" INFILTRATOR' INFILTRATOR SYSTEMS INC. 4 Business Park Rd. Old Saybrook, CT 06475 (800) 221-4436 QUICK4 PLUS STANDARD LOW PROFILE CHAMBER PRODUCT SPECIFICATION Drawn by: EMB Date: 07/24/2013 Scale: NOT To SCALE Checked by: DFH Sheet: 1 of 1