Loading...
HomeMy WebLinkAboutOWTS Design 02.28.16All • 3 Four Wheel Drive Rd Carbondale, CO 81623 970-309·5259 ~rn~1m ~ I I r February 28, 2016 Aimee Conrardy aconrardy@msn.com Onsite Wastewater Treatment System (OWTS) Design 4-Bedroom Residence Lot 51, Panorama Ranches Homestead Garfield County, Colorado Aimee, Project No. C 1195 ALL SERVICE septic, LLC has completed an onsite wastewater treatment system (OWTS) design for the subject residence. The property is located in Missouri Heights in an area where OWTSs are necessary. Legal Description: Lot 51, Panorama Ranches Homestead Parcel ID: 2391-163-01-051 SITE CONDITIONS A 4-bedroom , single -family residence proposed on the currently undeveloped property. The proposed residence will be served by a community water system. A ditch is located on the northern portion of the property. This ditch 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 is to the south of the proposed residence and slopes at approximately 20% to the south . There are no potential future land use changes or bedroom additions planned for the property. SUBSURFACE The subsurface was investigated on September 22 , 2015 by HP Geotech . Subsurface conditions are documented in a report dated September 30, 2015 under Job Number 115 439A (enclosed). Three percolation test holes and two profile pits were excavated . Percolation rates were recorded at 7 Y:z minutes per inch (MPI), 8 MPI, and 15 MPI. Practical digging refusal was encountered in Profile Pit 1 at 6 Yz feet and Profile Pit 2 at 7 feet. No groundwater or bedrock was encountered in either Profile Pit. A sample was obtained from Profile Pit 1 at 3 Yz to 5 feet below grade. A USDA Gradation was performed on this sample resulting in 7% cobbles, 13% gravel, 27% sand , 44% silt, and 9% clay . The soil has been classified as Gravelly Loam with Cobbles. STA sizing is based on Soil Type 2. A long term acceptance rate (l TAR) of 0.6 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. DESIGN SPECIFICATIONS Design Calculations: 4 bedrooms= min. 1250-gallon septic tank Design Flow= 75 gal/day x 2 people/bedroom x 3 bedrooms+ 75 gallon/day 4th bedroom= 525 GPO LTAR = 0.6 GPO/SF 525 GPD I 0.6 GPO/SF x 1.0 (gravity trenches) x 0.7 (chambers)= 612.5 SF 612.5 SF / 12 SF/chamber= min. 51 'Quick 4' Infiltrator® chambers Page 1 The OWTS design is based on 4-bedrooms. An average daily wastewater flow of 525 GPD will be used. The system installation will include a 1250-gallon, two-compartment concrete septic tank with an effluent filter (or screen) installed on the outlet tee of the septic tank. Effluent will gravity flow to a distribution box, which must be accessible from grade. Flow equalizers or similar product must be installed on the outlet of each pipe leaving the distribution box to assure equal flow to each trench. The STA will consist of four trenches of 13 'Quick 4' Infiltrator® chambers for a total of 52 'Quick 4' Infiltrator® chambers and 624 square feet of infiltrative area. Trenches must have a minimum of 6-feet of undisturbed soil between them. Installation depth of the chambers must be at least 2-feet below native grade and may not exceed 4-feet below native grade. Backfill over the STA must be uniform and granular with no material greater than minus 3-inch. Inspection ports must be installed at both the beginning and end of each trench. Inspection 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. 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 ST As, 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 ST A. Pagc3 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 OWfS. Grease should not be placed in household drains. Loading from a water softener should not be discharged into the OWfS. 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. INSTALLATION OBSERVATIONS ALL SERVICE septic, LLC must view the OWTS during construction. The OWTS observation should be performed before backfill, after placement of OWfS 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 Reviewed By: f p_J.i. {0-D.'51-i:lCA 8 ~~j ~Vll~_) Carla Ostberg, MPH, REHS I tem # 1 2 5 0T-2CP ALLOWABLE BURY (Based on Water Table) WATER TABl.E All.OWABl.E EARTHFJU O' -O" 'Z-0" 1·-0· 3'-O" ~-0" 3'-O" 3'-0" "' -O" DRY .ol'-O" DESIGN NOTES • Design per performance test per ASTM C1'22J • Top surface area 56.25 ftZ Top View • re@ 28 days; conaute = 6,000 PSI Min. . . lns .. lldon: • Tank to be set on S-min. sand bed or pea gravel 5S" :·I .; .. .. 1250 Gallon Top Seam Two Compartment ------· -135"- 20• Clear Accass TANK I 19" l } ~ 4 ti . I • '· '. 6 II '· .. '• • Tank to be backfilled uniformly on all sides In llfll 1898 than 24• and mechanically compaclBd , -.. + • o • I •• 0 , 1 1 .; .., ,~ '1 ,' , I > ~ I·~' 1' •' • Excavated material may be used for backfill, provided large stDnes era removed • Excavation should be dewat8red and lank filled wHh water prior to beilg put In service for lnstdatlon with water table less than 'Z bebv grade • Meets C1844-06 for reslDent connedDr8 • Inlet and Outlet Identified abova pipe • Delivered complela with 1n1ema1 piping • PVC or concrete r1serB avaBable • Secondary safety saeen avalable with PVCrtaer • Option of pump or siphon Installed *See Installation guide on our websila --130" ------i Invert Dlme,.lom Digging Spece 13' Long x r Wide 55• below inlet invert Inlet Outlet r Length I Width -Height 56" 53• I 135" ~ ea· --N•~ I Inlet Side "' Outlet Side ' Total 843 gallons 416 gallons 1.259 gallons NetW.lght Ud Tank Total 3, 120 Iba -10,880 lbs i 14,000lba l Water & 2flXl5 Co. Rd. 317 Waatewatar (71I) 395-87&4 P.O. BacB25 · 0 VALLEY •Systems Fax: 1719)395-3727 BuenaVIBla.0081211 •Products v 0 PRECAST Inc. •Service Websll8: www.valleypr8cast.oom ' Emall: frontdesk@valleyprecast.com Residential Biotube® Effluent Filters Applications Our patented* 4-in. ( 100-mm) Biocubc Effiucnc Filters, Biocubc Jr., Biocubc Insert Filters, and Biocubc Base !nice Filters arc ideal for residential septic tanks and have a lifetime warranty. They prevent large solids from le:iving che tank, dramatically improving wastewater quality and extending the life of residential drainficlds. 4-in. (100-111111) Bio111be Effluent Filter • 4-in. (J 00-111111) Biol/I be Jr. (4-in. Biot11be cartridge avail- able separately as lnsm Filter) : I 8-i11. (200-mm) Base Inlet Filter 1 4-ill. (100-111111) Insert Filter _;( r. Orenco's superior ejfl11e11t filters resist clogging berter than all other brands. Our stall · dard, fi1ll-sized 4-in. (JOO-mm) Biot11be Effluent Filter provides maximum long-term protection in t1 complete package, wirh housing. Our 4-in. (JOO-mm) Bio111be Jr., at half the size of our stt111dt1rd model, has more filtering capacity than the full-sized filters sold by other 111t11111fact11rers. For tanks with existing outlet tees. the Biowbe Insert Filter fr ideal And for low-profile tanks, there's the Base Inlet Filter. • Covered by l"'l<nt numbcu 5,492,(>35 ond 4,4 ''J.313 To Order Call your nearest Orenco Sysrcms (ll , Inc. discriburor. For nearest distribu - tor, call Orcnco ac 800-348-9843 or go m www.orcnco.com and click on "Distributor Locator." APS·FT·1 Rev. 3.4 © t1f10 Orenco Syslems~. 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. Orenco Systems• Incorporated Cl11111gi11g tlir m1y thr \f'orld Doer \\';utrll'aur • www.orenco.com Nomenclatures 4-in. Biotube Filter (sta ndard) FT D D 04 010 -010 ~ii::": :.~ .. 00 ... -.. A = lloat bracilel attached Caru.clge heigt.t: 28' and 36" aie Slandard ousi ng height· 3G" ard 44" are s:andJrd F1•ter diameter (inchesf w c r::s T111e 3034 outlet pipe S = l•IS Schedule 40 outlet pope Blank 1/8" f;:uat1on P 1/16" l1:!1ation B.otube elfiltcnt Mer series 8-in. Biotu be Filter lba se inlet modell FT 0 oe 22-1 1 4 B,~. om.- Fs = 2" outlet oc;tice FSO = 2" outlet 011lice and ovet11ow plate• Base n 'et model Cart11dge he:ght· 14" standJrd Housing hei ght 22" standard f ilter d:ameter ~nches) 08 c 8" B:ank • 1/8" l1ltra!1an P = 1/16" l1!:ration BIO:ube elliuent l"ter seres • Als11 avail.lblc 1·1.ih couping and sleeve as a 'k1r: FT-OVERFLOWKIT 4-in. Biotube Jr. (includes cartridge and housing) FT J 0004 118 9::-. oo"'m' M = flow modulallOO pla:e ons1a:1e11 A = llOat bracket anachell Carl!idge height («hes) Filter diamete1 (inches) W • fits Type 3034 outlet tee S I.ts SChedule 40 outle1 tee Blank • t 18" filtration P " 1116" IWJa!lon Junior series Bootube effluent r•ter series 4-in. Biotube Filter Insert !cartridge onlyl FT i Oo4 1a -D-c=I 11 ~ cus:omiZed oou.-is (e g NC lnlfx:a:cs llallh Carolina reg;ons) VI = lits Type 3034 outlet tee S = lits SCheduie 40 outie11ee Carvidge tieigt.t (Inches) Fi:ter d:ameter ('nchesl Blank ., 1/8· f.l:rn~on p .. 1/16" r1r.rat1on Insert 81o!ube effluent hlter series 4-in . Biotube Effluent Filter 4-in. Biotube Jr. ,--,._____ Extendible PVC handle --c:;::n Solid base Filter housing ---t 000 Discributed By: Item# DBox8C Concrete Distribution B ox (1 inlet, 7 outlets) & Ris er Top View ---28"'---- I . -:-'\ 4 14" ® End View Riser Section .---28"---. . -·. I . .. " • - ' --. . ·.-• -· 4 -')" _.• . ~ --... . .. . . . -.:I '. - :. 4 •• : ""~ •• . .. •. • ' ~ 8 • " ock Down Baffle Section View ---28"'-- ---25"---. 1a· , ® ® ® D . , __ ·28"'-- "1'2· 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: Side View End View D-Box with Baffle -200 lbs D-Box Lid -75 lbs D-Box Riser -140 lbs Water a 2lDl5 C.O. Rd. 317 Waatawatar (71I) 395-87&4 P.O. Boc925 0 v ALLEY : == Fax: (719) 395-3727 Buena VIBla, 0081211 0 PRECAST Inc •Service Website: www.valleyprecast.oom ' • Emili: frontdesk@valleyprecast.com ' 0 4.49 r ~11.4 cm ] ~-~ I~ 5.32 ~ [13.Scm J THIS WEIR SHAPE , IS SELF LEVELING THESE RIBS PROVIDE FRICTION ~ FIT FOR ALL 411 PIPE ID '- 1.73 .09 [4.4 cm J [.2 cm J GEAR AND RACK PROVIDES POSITIVE ONE TIME LEVELING . ~l 1. ~ ' ru , i.-:s= ~ I 1.i-1 I 1a1 11&if "I ,fl] I . ' [2.7 cm J · • POLYLOK EQUALIZER 1~! PART NO. -3049 I MATERIAL -FILLED POLYPROPYLENE