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HomeMy WebLinkAboutSubsurface Investigation and OWTS Design April 11, 2015 Project No. C1133 Terry and Heidi Ruonavaara thruonavaara@msn.com Subsurface Investigation and Onsite Wastewater Treatment System Design 4-Bedroom Residence 160 Springridge Drive Garfield County, Colorado Permit Number SEPT-3-15-3559 Terry and Heidi, 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 outside of Glenwood Springs, in an area where OWTSs are necessary. Legal Description: Lot 21, Springridge Place Subdivision SITE CONDITIONS The existing property is currently undeveloped. A 4-bedroom residence is proposed. The subdivision is served by a community water system. The proposed soil treatment area (STA) location has a slope of approximately ten percent and is vegetated with native grasses. There are no potential future land use changes or bedroom additions planned for the property. SUBSURFACE The subsurface was investigated on April 7, 2015 by digging two soil profile test pit excavations (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, underlain by medium brown, moist, clay loam to 5-feet, underlain by medium to light brown, moist clay loam to a maximum depth explored of 8-feet. A large boulder was encountered at 8-feet. No bedrock or groundwater was encountered. The materials encountered in Test Pit #2 were consistent with those encountered in Test Pit #1. There was less color variation of the soils in Test Pit #2. The Test Pit was explored to a maximum depth of 9- feet. No bedrock or groundwater was encountered. 1 Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile Evaluation of Soils Training. Page 2 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 soil had a smooth and gritty texture. Soil structure shape was blocky, soil structure grade was strong, and consistence was friable. STA sizing is based on Soil Type 3, Clay Loam with blocky structure type and strong structure grade. A long term acceptance rate (LTAR) of 0.35 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. Test Pit #1 Pipe encountered in pit Sieved sample Large boulder encountered Test Pit #2 Page 3 DESIGN SPECIFICATIONS The OWTS design is based on 4-bedrooms. An average daily wastewater flow of 525 GPD will be used. Design Calculations: Design Flow = 75 gallons/person x 2 people x 3 Bedrooms + 75 gallons (4th bedroom) = 525 GPD LTAR = 0.35 GPD/SF 525 GPD / 0.35 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 1050 SF 1050 SF / 12 SF/chamber = min. 88 ‘Quick 4’ Infiltrator® chambers The system installation will include a new 1250-gallon, two-compartment concrete septic tank with an effluent filter on the outlet tee. Effluent will flow to a baffled distribution box, accessible from grade. The STA will consist of four trenches, each with 22 ‘Quick 4’ Infiltrator® chambers for a total of 88 chambers and 1056 square feet of infiltrative area. There must be at least 6-feet of undisturbed soil between each trench. Inspection ports must be installed at the beginning and end of each trench, and may be cut to grade and placed in 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 are 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 plated 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. Page 4 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. 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. Page 5 Please call with questions. Sincerely, ALL SERVICE septic, LLC Reviewed By: Carla Ostberg, MPH, REHS Liability Clause: Under no circumstances whatsoever shall the liability of ALL SERVICE septic, LLC, in connection with any contract, directly or indirectly, exceed the total amount paid by the client to ALL SERVICE septic, LLC for the services and/or goods which are the subject of the contract in connection with which the liability arises. N ~ I I I O' 20' 40' Scale : 1" = 40'-0" DRAWINGS MUST BE USED IN CONJUNCTION WITH DESIGN LETTER DATED 4/11 /15 ALL ~ ~rn1m1 W 33 Four Wheel Drive Road Carbondale , Colorado 81623 Phone 970 .309 .5259 carla@allserviceseptic.com F LOOR ELEVATIO NS MAIN LEVEL -97'-6" (100'-0") WWER LEVEL= 88'-6" (9 1'-0") GARAGE= 96'-3!" (98'-9!') PLANTING LEGEND Q'rr, SPEQES 11 EVERGREEN ~ 21 DECIDUOUS J c: IJ ~ ~ --::;~ ·~. 0 !JO: "/" a" -Q I I I L I I I I I I I I I I I I I I I ~4 I I I I --f(- O' Fron t Loi Se t back Pie r Plot 100 102 (jl PARTIAL SITE P~A~ __ Ruonavaara Residence 160 Spring Ridge Drive Garfield County, Colorado Project Number: C1133 Date : 04/11/15 Designed By : CBO Reviewed By : RHPI Drawn By : ANG W1.0 Sheet 1 of 6 N ~ I I I O' 10' 20' Scale : 1" = 20'-0" ALL ~ ~rn1m1 W 33 Four Wheel Drive Road Carbondale , Colorado 81623 Phone 970 .309 .5259 carla@allserviceseptic.com 'QUl~-4' CH~BER TRENCHESO> ""' ' 22 C AMBE~S IN EACH fRENCH = 88 HAM Bf= RS = 1056 SF 84 I ..,._, 0 --' Z> ) I 82 Ti ~ ~ ~ /111111\; .~ (2) PROPOSED OWT~ __ _ Ruonavaara Residence 160 Spring Ridge Drive Garfield County, Colorado Project Number: C1133 Date : 04/11/15 Designed By : CBO Reviewed By : RHPI Drawn By : ANG ' '- W2.0 Sheet 2 of 6 DESIGN 4-BEDROOM RESIDENCE (75 GAUPERSON/DAY x 2 PERSONS/BEDROOM x 3 BEDROOMS) (75 GAUPERSON DAY X 1 PERSON/BEDROOM X 1 BEDROOM) WASTEWATER FLOW= 525 GALLONS TANK: 525 x 48 HOUR RETENTION TIME= MIN. 1250 GALLONS USE 1250-GALLON, TWO-COMPARTMENT TANK SOIL TREATMENT AREA {STA): LONG TERM ACCEPTANCE RATE {LTAR) = 0.35 GAU SQ FT CAL CU LA TED ST A = Q/L TAR = 525 I 0.35 = 1500 SF GRAVITY, TRENCHES= 1500SFX1.0 = 1500 SF CHAMBERS= 1500 SF X 0.7 = 1050 SF I 12 SF I CHAMBER= 88 CHAMBERS FOUR GRAVELLESS CHAMBER TRENCHES 22 'QUICK 4' CHAMBERS IN EACH TRENCH TOTAL 88 'QUICK 4' CHAMBERS BOX AND COVER BROUGHT TO GRADE l CONCRETE LID~ FINSHED GRADE 0 0 0 Olr OUTLETS \ BA _ FFLE OR DISTRIBUTION BOX ANGLED PIPE ALL ~ ~rnrl~l • ®DISTRIBUTION BOX 4-0UllET NOT TO SCALE 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com TO BE USED AT INLET SLIP-ON PVC CAP-- DO NOT GLUE INSULATED COPPER TRACER WIRE 4" DIA SDR-35---~ SEWER LINE TO TANK TO HOUSE @ C~EANOUT DET~ll:__ ---·- INFIL TRATOR(R) QUICK4(TM) CUT SHEET ,JD +~J~ LINES TO ENTER AND EXIT IN TOP PORT OF CHAMBER END PLATE--- ©CHAMBER DETAILS NOT TO SCALE Ruonavaara Residence 160 Spring Ridge Drive Garfield County, Colorado Project Number: C1133 SLIP-ON PVC CAP DO NOT GLUE 4" DIA SDR-35--- INSPECTION PIPE 90° ELBOW---- SPRINKLER VALVE BOX AT GRADE ¢1;.,.. , ,., FINISHED GRADE 1/4" DIA HOLE DRILLED INTO TWO SIDES OF PIPE i......-..~ FOR VENTILATION STA FILTER 4 ~ (BELOW SLIP ON CAP) MEDIA ©INSPECTION PORT DETAIL NOT TO SCALE COMPACT SOit BASE TO SUPPORT BOX USE HOLE SAW TO -----SMALL VALVE COVER BOX OR IRRIGATION VALVE BOX AT GRADE ATTACH CAP OR THREADED CLEANOUT ASSEMBLY 4" PVC PIPE CUT TO FIT CUT THRU TOP OF Xd U/ II II 11'-/II II II '" '= I END PLATE--__,· 0 PROPOSED OWTS NOT TO SCALE Date: 04/11/15 Designed By: CBO Reviewed By: RHPI Drawn By: ANG W3.0 Sheet 3 of 6 CHAMBER TRENCH CROSS SECTION -TYP. ri j 4lax LIMITOF EXCAVATION SCARIFY SURFACE----- © TRENCH DETAIL NOT TO SCALE GRAVELLESS 'QUICK-4-' CHAMBER (4' x 3') PLAN VIEW-TYP. -GRAVELLESS 'QUICK-4-' INFILTRATOR END PLATE INSPECTION PORT CHAMBER (4' x 3') ~--------------------88'~-------------------~ ALL ~ ~rnrl~l • 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com 22 CHAMBERS PER TRENCH ® TRENCH PLAN NOT TO SCALE Ruonavaara Residence 160 Spring Ridge Drive Garfield County, Colorado Project Number: C1133 4" DIA EFFLUENT PIPE FROM SEPTIC TANK PIPES PLACED IN TOP PORT OF CHAMBER END PLATES Date: 04/11/15 Designed By: CBO Reviewed By: RHPI Drawn By: ANG W4.0 Sheet4 of6 ALL ~ ~rnrl~l • Residential Biotube® Effluent Filters App I icat ions Our patented* 4-in. (100-mm) Bio rube Effluent Filters, Bio tube Jr.> Bioru be Insert Filters, and Bio rube Base Inlet Filters are ideal for residential septic tanks and have a lifetime warranty. They prevent large so lids from leaving the tank, dramatically improving wastewater quality and extending the life of residen rial drainfields . 4-in. (JOO-mm) Biotube Ejf!uent Fr.'lter • 4-in (100-mm) Biotube Jr. (4-i n Biotube cartridge avail- able sepamte!J as Imert Filter) 8-in. {200-mm) B12se Inlet Fr.'lter 4-in.. (JOO-mm) Imert Hlter Ormco's superior effluent filters resist cl.ogging better than a!J other br12nds. Our stan- dard, fa.!J.siz ed 4 -i n (100-mm) Biotube Ejf!u.mt Filter provides maximum kmg-tum protectz'on in a compute package, with housing. Our 4-in (JOO-mm) Biotube Jr., at half the size of our standa.rd model hi2S more filten'ng capac ity than the foll-sized filtm sold by other manufacturers. For tanks with e:x:istr.'ng outkt tus, the Biotube Insert Hlter is ideal And for low-p rofi k tanks, there's the Base Ink t Fr.lten • Cov0<ei by P'-"'"' numb,.,; 5 ,492,635 >.nd 4439.323 To Order Call your nearest Orenco Systems®, Inc. distributor. For nearest di stribu- tor, ca ll Oren co at 8 00-348-9843 or go to www.orenco.com and click on "Distributor Locator." APS-FT-1 Rev. U ® 11/10 Orerrn Sysens@. 11& 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com Standard Features & Benefits • Has 5-1 O times more flow area than other brands, so I as ts many nme s longer between clean- ings, in ere as ing home owner satisfa cfon • In sta ll s in min- ute s in side new or exist in g tank s; extend ibl e tee handle for easy removal Optional Features & Benefits • Alarm ava il ab le, to signa I the need for cleaning Fl ow modulating discharge orifices avai labl e to limit flow rate leaving tank, mitigat- ing surge s and increasing reten non time Custom and comme rcia l sizes avai lab le • Easy to clean by simply hosing off whenever the tank needs pumping • Removes <ibout two-thirds of sus- pended so Ii ds, on average, extending drainfield life • Co rro si on-proof co nstru cti on, to en sure I ong Ii le • Lifenme warranty Biotube Filtering Process Effluent from the relatively cl ear zone of the septic tank, between the scum and sludge l<iyers, h ori zo ntal ly enters the Bio 1JJ be Effluent Filter. Effluent then enters the annular space between the h ous in g and the B iotu bes, uti Ii zing the BiotJJ bes' ennre surface for Iii teri ng P arti cle s I arger th an the BiofJJ be's mesh a re p reven te d from I ea vi ng the tank ~/ ~..,, ~, CB Orenco Sy&tem'li ~ lroo-oormed Chr.,,gir.t the ~y zhe '.Yhrld Do" Wiist..,,,,,,itr 8 W\Yw.oranco.com Nomenclatures 4-in. Biotube Filter (standard) FT 0 0 04100-010 ~lions Blank ~ no opti ms M ~ fiw mcd ulation pla te installed A ~ float !racket attached . Cartridge h~ght 28" and 36" are standard omng height: 36" and 44" are sta n:lar d Filter diameter (inches) W ~fits Type 2£l34 ru tle t pipe S ~fits Sc hldule 40 outlet pipe Blank 1/B" filtration P = 1/16" filtrati m Biotube efftuent filter sffies 8-in. Biotube Filter (base inlet model) FTO 08 22-14 BC] ll ~ons A = fioat bracket FS ~ 2" outlet orifice . F. SO ~ 2" outlet orifice and omflo w pate· Base inlet mcdel Cartridge height 14" standard Hrusini heght: 22 ' standard Filter diametff (1 rc hes) 08 ~ 8' Blank 1/8" filtration P = 1/16" filtrati rn B1otube efftuent filter smes ·Also available with coupling and slee1e as a "kit ' FT-O VE RFLOWKIT 4-in. Biotube Jr. (includes cartridge and housing) FT J 000418 CJ ll ~ons Blank = no options . M. . = fl ON modulation plate imtalloo A = float bracket attached Cartridge he1 (/lt ~nches) Filtff d1ametff (1 rc hes) W fits Type 3034 outlet tee S = fits Schedule 40 outiet tee Blank 1/8" filtration P 1/16" filtration Junior series Biotube efftuent filter sff ies 4-in. Biotube Filter Insert (cartridge only) FT i 0041B-0-CJ 11 Ta. ·.Frr. customized optrns (e.g., NC indicates Nath Carciina regions) W ~ fits Type 3034 ru tlet tee S ~ fits &:hedule 40 rutie t tee Cartridge heght (inches) F1ltff d1ametff ~nches) Blank 1/8" filtration P = 1/16"11ltrati rn Insert B1otube efftuent filter sme s Ruonavaara Residence 160 Spring Ridge Drive Garfield County, Colorado Project Number: C1133 4-in. Biotube Effluent Filter 4-in. Biotube Jr. Extendible PVC handle --_!I Stainless steel set screws Air vents ~~ Solid base I"' Filter housing 000 Tank wall Distributed By: -Riser wall @o EFFLUENT FILTER DETAILS NOT TO SCALE Date: 04/11/15 Designed By: CBO Reviewed By: RHPI Drawn By: ANG W5.0 Sheet 5 of 6 Item# 1250T-2CP 1250 Gallon Top Seam Two Compartment Top View ~~~~~~~~~~~~---'1 35"'~~~~~~~~~~~~~ ALLOWABLE BURY (Based on Water Table) WATER TABLE ALLOWABLE EARTH Fill. O' -0" 2'-0" 1'-0. 3'-0'" 2'-0" 3'-0'" 3'-()'" 4'-0" DRY 4'-0" Section DESIGN NOTES View • Design per performance test per ASTM C1227 • Top surface area 56.25 ft2 • fc @ 28 days; conaete = 6,000 PSI Min. .. L.:.......:...i·· ~-'-. .:........:...: . ~·--.~·~-1 . .-r~· ~ ·~·4~· 20· Clear Access f at: V r/ S"' ~-~·~j_·~ ... ~··:7'·J.·.~ .. ~4~·~~'~ ..... .. ·.d_ .. • •• .. -• . .'• ...... • '·<·•:.··i,' + lnstallatlan: • Tank to be set on 5• min. sand bed or pea gravel 56"L ;1 :14/"on • Tank to be backfilled unifonnly on all sides in lifts less than 24• and mechanically compacted • Excavated material may be used for backfill, provided large stones are removed • Excavation should be dewateled and tank filled with water prior to being put in service for installation with water table less than Z below grade • Meets C1644-06 for resillent 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 • ~-·. .... .... . . "': ... ---- .-.. :· .. ~ : .. ., .. · .... · . > : : .-.. ~ 130"·----------- Digging Spece Invert DlmanelaM 13' Long x 7' Wide Inlet Outlet Length Width Height 55• below inlet invert 55• 53• 135• eo· ea· Nat Cepecltv Inlet Side Outlet Side Total 843gallons 416 gallons 1,259 gallons Nat Weight Ud Tank Total 3,120 lbs 1 10,880 lbs 1 14,000 lbs Water & (71I) 39Ml784 28tXJ5 Co. Rd. 317 W........, PD.IDQ25 o VALLEY := Fa: (71s>385-3m a.naV1a1a.coa1211 0 PRBCAST, lac. •Service == www.valleypramat.oom ALL ~ ~rnrl~l • 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com SOIL PROFILE TEST PIT NO. 1 1-w w u. I l-a.. w Cl 0 2 3 4 5 6 7 8 9 10 2' DARK BROWN, MOIST CLAY LOAM MEDIUM BROWN, MOIST CLAY LOAM MEDIUM TO LIGHT BROWN, MOIST CLAY LOAM LARGE BOULDER ENCOUNTERED AT 8' NO GROUNDWATER OR BEDROCK ENCOUNTERED DURING EXCAVATION Ruonavaara Residence 160 Spring Ridge Drive Garfield County, Colorado Project Number: C1133 @1 SOILS LOGS SOIL PROFILE TEST PIT NO. 2 2' DARK BROWN, MOIST CLAY LOAM MEDIUM BROWN, MOIST CLAY LOAM MEDIUM TO LIGHT BROWN, MOIST CLAY LOAM NOT TO SCALE LEGEND n clayloam Date: 04/11/15 Designed By: CBO Reviewed By: RHPI Drawn By: ANG W6.0 Sheet 6 of 6