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HomeMy WebLinkAboutSubsurface Investigation and OWTS Design 08.04.15A LL • 33 .FourWbeel Drive Rd Carbondale, CO 11623 9711-309·5259 ~rn~1m ~ , 1 ~ August 4, 2015 Craig Petersen craig@ajaxbikeandsport.com Subsurface Investigation and Onsite Wastewater Treatment System Design 4-Bedroom Residence I 1-Bedroom Cabin 5107 and 5109 CR 154 Garfield County, Colorado Craig, Project No. C1165 ALL SERVICE septic, LLC performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject property. The property is located outside of Carbondale, in an area where OWTSs and wells are necessary. Legal Description: Lot 2 of the Ice Minor Subdivision SITE CONDITIONS The subject property was previously developed with a 1-bedroom cabin and single family residence. The cabin remains, but the single-family residence has been razed and the existing OWTS serving the property was abandoned. A new, 4-bedroom single family residence is proposed and is presently under construction. There is a private well located on the property to the south of the existing cabin. The well will be located greater than 50-feet from the proposed septic tank and greater than 100-feet from the proposed soil treatment area (STA). The proposed STA must also be located 50-feet from the Roaring Fork River, 20- feet from the residence, and 10-feet from the property line. The proposed STA location slopes slightly to the southwest toward the Roaring Fork River. The proposed STA will be located to the southwest of a proposed metal shop, partially in the area of an existing driveway. No traffic of any kind should drive over the STA. The STA should be fenced or otherwise protected from vehicle traffic. There are no bedroom additions planned for the property. Page 2 SUBSURFACE The subsur1ace was investigated on July 13, 2015 by digging two soil profile test pit excavations (Test Pits). A mini-excavator was used to excavate the test pits. Visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.1 The materials encountered in the Test Pit #1 consisted of dark brown, moist, topsoil to 1.5-feet, underlain by reddish brown, gravelly, loam to a maximum depth explored of 7.0-feet. No bedrock or groundwater was encountered. The materials encountered in the Test Pit #2 were similar to those encountered in Test Pit #1. No bedrock or groundwater was encountered. A tactile analysis of the soils was taken from Test Pit #1 at approximately 3-feet below grade. The soil formed a ball, and a ribbon less than 1-inche before breaking. Soil structure shape was blocky, soil structure grade was moderate, and consistence was friable to firm. STA sizing is based on Soil Type 2, Loam with blocky 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 1 presented in the Garfield County On-Site Wastewater Treatment System Regulations, adopted April 14, 2014. 1 Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. DESIGN SPECIFICATIONS Design Calculations: Average Design Flow= 4 Bedrooms (house)+ 1 Bedroom (cabin)= 525 GPO+ 150 GPO= 675 GPD LTAR = 0.6 GPO/SF 675 GPO I 0.6 GPD/SF x 1.2 (gravity bed) x 0.7 (chambers)= 945 SF Pagc3 The new OWTS design is based on 4-bedrooms in the main residence and 1-bedroom in the Cabin. An average daily wastewater flow of 675 GPO will be used. The system installation will include a new 1500- gallon, two-compartment concrete septic tank with an effluent filter installed on the outlet tee. The STA will consist of two beds, one with three rows of 14 'Quick 4' Infiltrator® chambers connected with a level manifold (STA 1 ), and the other with four rows of 1o'Quick4' Infiltrator® chambers for a total area of 984 square feet of infiltrative area. The infiltrative area may not exceed 4-feet below native grade. Inspection ports must be installed in all four corners of each bed and may be cut to grade and covered with a sprinkler box for access. The STA should be fenced or otherwise protected from traffic. 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 Page 4 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 install ed 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, 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 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, Reviewed By: ALL SERVICE septic, LLC ~~ , ~"'"'"'-- Carla Ostberg, MPH, REHS Stele: 1' • 100'.Q" DESIGN 4-8EDROOM RESIDENCE 1-8EDROOM CABIN (75 GAl..IPERSON/DAY x 2 PERSONS/BEDROOM x 3 BEDROOMS+ 75 GALLONS (4TH BEDROOM))= 52.5 GALLONS (75 GAl..IPERSON/DAY X 1PERSONS/BEDROOMX1BEDROOM•150 GALLONS WASTEWATER FLOW= 525 GAL+ 1!50 GAL= 875 GALLONS TANK: 5 TOTAL BEDROOMS= MIN. 1500 GALLON TANK SOIL TREATMENT AREA (STA): LONG TERM ACCEPTANCE RATE (LTARI = D.6 GAU SQ FT CALCULATED STA= tnTAR =875fD.6 = 1125Sf GRAVITY. BEDS" 1125 SF X 1.2" 1350 SF CHAMBERS = 1350 SF X 0.7 = 945 SF I 12 SF I CHAMBER • 79 CHAMBERS TWO GRAVEUESS CHAMBER BEDS STA 1: 3 ROWS OF 14 STA 2: 4 ROWS OF 10 'QUICK 4' CHAMBERS IN EACH BED TOTAL 82 'QUICK <I' CHAMBERS 33 Four Wt...i Drive Ra.:! Carnandala, Colorado 81623 Phone 970.309.5259 Clllla@-llseMceaepllc.aim .... ..... .... ..... ..... ..... ..... ..... ..... ..... ..... .... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ............... ................ .......... ..... -..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... \ CD SIJE PL.AN , -...... Petersen Residence 5107 llld 5109 CR 154 Gmteld County, ColOflldo PIOject Number. C1165 ..... ..... ..... ..... ..... I I DRAWINGS MUST BE USED IN CONJUNCTION Wm! DESIGN LETTER DATED 08/04115 Dale: 08/04/15 Designed By: CBO Reviewed By: RH o,_,B .ANG W1.0 Sheet 1 of J N ~ ~ fl 1f1 20' ' ' ALL ~ 1m1~1 • INSPECTION PORT AT EACH CORNER OFSTAa 33 FilurWheel Oliva Road carbondale, CdOllldo 81623 Ptmne 970.309.5259 Clllla~mm \ \ \" NOTE : SCHEDULE 40 PVC PIPE MUST BE USED UNDER ALL OWELL -'--'--4• DIA SDR-35 SEWER LINE I I 4-SEDROOM RESIDENCE 0snE PLAN I ...... Pelersen Residence 5107 and 5109 CR 154 Garlleld Col.rli)'. Colorado Pll)jed Number. C1165 WITli DOUBLE-SWEEP CLEAN OUT (MIN 2% SLOPE TO TANK) CONCRETE DRJVEWAY --------- Date: 08104115 Designed By: CBO RIMawed By: RH °'8wrl 9 . ANG --- W2.0 Sheet2ol2 4" DIASDR-35 SEWER LINE (MIN 2% SLOPE) •4• STA 1 • 42 CHAMBERS (3 ROWS OF 14) STA 2 • 40 CHAMBERS (4 ROWS OF 10) ----INSPECTION PORT AT EACH CORNER OF STA INFIL TRATOR(R) QUICK(TM) CHAMBERS, 3' X 4' '-------V.ARIES Pt:R EACH STA---------" CDSTA PLAN BACKFILL 4" DIA SDR·35 INSPECTION PORT Willi CAP AT EACH CORNER OF STA (MUST BE MINUS 3-INCH MATERIAL) St.OPE FOR !2RAI ----.;:;;::-HA_c_e.._ __ ..U.~J BED @STA SECTION wt w ea 33 Four Wheel Drive ROid catbondale, Colotado 81623 Phone 970.309.5259 Clllla@alu~cam ••EAJ SUP-ON PVC CAP DO NOT GLUE 4" DIA SDR·35---, SEWER LINE Petersen Residence 5107 and 5109 CR 154 Garlleld C-.ly, Cdarado Project Number. C1165 +~.J~rr LINES TO ENTER ANO EXIT IN lOP PORT OF CHMlllER @0tAM9ER 0£pl""au ENOPLATE BOX AND COVER BROUGHT TO GRADE l CONCRETE LID~ ~--7 ~ lo~ol±,ne°" DISTRIBUTION BOX ANGLED PIPE TOBE USED ATINLET SPRINKLER VAL.VE BOX AT GRADE 114" DIA HOLE DRILLED INTO TWO SIDES OF PIPE FOR VENTILATION IBELOW SLIP ON CAPI © it.ISPECTION PORT R,Q"~ Dale: OMMl15 Designed By; CBO Reviewed By: RH DnrwnB .ANG W3.0 Sheel3ol3 Item# 1500T·2CP 1500 Gallon Top Seam Two Compartment -------132··------- Top View Section View 6 • .• 5 ··:. • ·~· 5 • ... ' ..,.,........,~,...........,~ ~-.---------' . ._,._ __ ~__..J·· .. . ~ ..• . •,, ... ···•.. .. . . ..... . ------129"·------ D~lng a.-. lnnrt ~-· l.aVh 1 Wldlh Hele# *Ma9ts ASTM C-1227 spec lncludlng 1 :r Lang x. Wide Inlet Outlet C-1~8 for reslllent connector. 68" below Inlet Invert 68" 53• 132" .. .. • 6000 psi conCl8te • Delivered complete with lntemaJ piping • PVC, poly or conCl8te risers avaJlable • Option of pump or siphon Installed Waler & Waac.wat8r () VALLEY :=: . 0 PRECAST, Jae. ·Service !nliSlde . ~~ Tolil JI 1,002 galans 503 gallara8 1,S05 galans N81Welght Lid T.. Toe.I 3,800.. 11,180 Ill 1•.180 .. (719) 395-8784 BmCo. Rd.317 P.O. Bodl25 Fax: (719) 395-3727 Blala Vista. 0081211 Webelta: www.vaJayprecaat.com Email: com Residential Biotube® Effluent Filters Applications Our parented* 4-in. (100-mm) Biocube Effiuenc 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. (JOO-mm) Biotube Ejflumt Filttr ~ ( .. r •• ( 4-in. (JOO-mm) Biotttbe Jr. (4-in. Biotube cartridge avail- able separattly as Imm Filttr) --- 8-in. (200-mm) Bast Inlet Filter r 4-in. (JOO-mm) Insert Filttr Orencos superior effluent filtm mist clogjng bmer than all other brands. Our stan - dard, /111/-sized 4-in. (100-mm) Biotubt Ejflttmt Filter provides maximum long-ttrm prottction in a complttt package, with housing. Our 4-in. (JOO-mm) Biotubt Jr., at half the size of our standard model, has more filtering capacity than the fo/1-siud filtm sold by other manufacturm. For tanks with existing outlet tm, the Biotubt lmtrt Filttr is ideal. And for /ow-profile tanks, there's the Bast Inlet Filttr. • C:O..mi by p•t•nt numbc:n 5,492,635 anJ 4.439 .323 To Order Call your nearest Orenco Systemsm, 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·I Rav. 3.4 ~ 11110 Oren co Sy11ems•. 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 surf ace for filtering. Particles larger than the Biotube's mesh are prevented from leaving the tank. Orenco Systems· Incorporated 0111t1ging rh~ t\~y 1'1~ "1'rlJ Don Wfu1euia1,.,.• www.arenca.com Nomenclatures 4-in. Biotube Filter (standard) FT 00 o4 010 -01DbfJ~.oo- M "' Oow modulatiln pla!l! lnstaJed A = Hoat lncket attached cartridge height 28" and 36' are standard ousVig height 36' and 44' are standard Filter diameter Qnchesl W =fits Type 3034 outlet pipe S = fits Sdlelklte 40 outlet pipe Blank = tl8' filtratlOn p = 1/16' filtration Blotube effluent fiher seiles 8-in. Biotube Filter (base inlet modell FT 0 o8 22.114 18 ~00~ A "' float bratket FS • 2· outlet orifice FSO • 2· outlet otlfice and Mfflow plate' Base Inlet model Canrldge height 14' standard !loosing height: 22' standard Filter diameter (inches) oa = a· Blank .. 118' filtration P = 1116' 1ittratioo Biotube effluent filter seiles ·Also available with coupling and sleeve as a 'kit'; FT-OVERR.OWKIT 4--in. Biotube Jr. (includes cartridge and housing) FT J 00 04 18 CJ 1 ~tlons: Blank = no options M = now modulation pla!l! 111S1alted A = float bracket attadled C3/1rldge height Q~ Ater diameter (mdles) W = fits Type 3034 outlet tee S = fits Schedule 40 outiet tee Blank = 1/8' filtration P 1/16' fillraUOO Junior series Blotube elltuent fil'.er sei1es 4--in. Biotube Filter Insert (cartridge ontvl FT i 0 04 18-0 -i=J 11 ---i-;:-customized options (e.g • NC lndii:ates Nor111 Carollna regions) W = fl13 Type 3034 outlet tee S = frts SChedule 40 outlet tee Cartridge height (flChes) Riter diMleter (lllClles) Blank = 1/8' filtration P = 1/16' filtratlon Insert Blotube effluent fitter series 4--in. Biotube Effluent Filter 4--in. Biotube Jr. r;::lt--Extendible PVC handle --'-'-' ....... Filter housing ---1 000 Distributed By: Item# DBoxBC Concrete Distribution Box (1 inlet, 7 outlets) & Riser Top View --2·a"·-- 15" 14" -!1-------.• 4 End View Riser Section i---28"·-- 1 ... •. .. . .. " •. ·• . J • . .. . ·.. • -· .... 2" .. · . .d •• 1 " r . . . . : . . ... __ ' . 4 ·-- . . -. -. ~ -"· .. _-_. -""• 12" Side View End View Section View --28"·-- i---25"·---. 14· , ® ® ® D . 7" --28"-- '1~· 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 Bame -200 lbs D-Box Lid -75 lbs D-Box Riser -140 lbs Water a 28XJ5Ch Rd. 317 WutewalBr (71I) 395-878' P.O.BaK925 o VALLEY :=: Fa: (719)395-3727 BuenaV1sta.cos1211 0 PRECAST Ill •Service Webslt&: www.vaDeypracast.com · t c. Email : fi'OI ddesk@vallaypracom 5.32 r 13.5 cm ] ¢4.49 [11.4 cm J THIS WEIR SHAPE IS SELF LEVELING THESE RIBS PROVIDE FRICTION FIT FOR ALL 4" PIPE ID 1.73 .09 [4.4 cm J C.2 cm J ! I l I GEAR AND RACK PROVIDES POSITIVE ONE TIME LEVELING POL YLOK EQUALIZER PART NO. -3049 MATERIAL -FILLED POLYPROPYLENE