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Home My WebLink AboutOWTS Design Report 06.23.16Huddleston-Berry Engineering & Testing, LLC Mountain View Construction Services, LLC 1413 Munro Avenue Rifle, Colorado 81650 Attention: Subject: Mr. Jerry Caves O WTS Design Lot 5 Creek Side Estates Rifle, Colorado 640 White Avenue Grand Junction, CO 8150 I Phone: 970.255.8005 Fax : 970.255.6818 info ~i•HuddlcstonBcrry.com www.HBET-GJ.com June 23, 2016 Project#O 1273-0016 Reference: Geotechni<.:a/ lnvesligation, Loi 5 Creek Side Esta/es, Colorado by Huddleston- Berry Engineering & Testing, LLC for MountainView Construction Services, LLC,June 15, 2016. Dear Mr. Caves, At your request, Huddleston-Berry Engineering & Testing, LLC completed design of an Onsite Wastewater Treatment System (OWTS) for a single-family residence at Lot 5 of the Creek Side Estates subdivision in Rifle, Colorado. A site plan is included as Figure 1. Site Description At the time of the investigation, the site was open with a slight slope down to the southwest. Vegetation consisted primarily of grasses and weeds. The site was bordered to the north and east by residential properties, to the west by a vacant lot, and to the south by a shared driveway. Subsurface Investigation As discussed in the referenced report, the subsurface conditions at the site were fairly consistent. The test pits generally encountered 1.0 foot of topsoil ,above brown, moist to wet, medium dense silty, clayey sand soils to the bottoms of the excavations. Groundwater was encountered in TP-1 at a depth of 4.0 feet at the time of the investigation. The locations of the test pits are shown on Figure 1. Copies of these test pit logs are included in Appendix A. Onsite Wastewater Treatment System Percolation testing was conducted in TP-2 through TP-4 in accordance with Garfield County regulations. The percolation rate in the native soils ranged from 40 to 57 minutes-per-inch, with an average of approximately 46 minutes-per-inch. The percolation testing data are included in Appendix B. Lot 5 Creek Side #01237-0016 06/23116 In accordance with Garfield County regulations, a percolation rate of between 5 to 60 minutes- per-inch is required for the subsurface to be deemed suitable for onsite wastewater treatment. Therefore, the native soils are generally suitable for onsite wastewater treatment. In addition to the percolation rate of the subsurface materials, the seasonal high groundwater elevation is an important factor in determining the suitability of the site for Onsite Wastewater Treatment Systems (OWTS). For OWTS suitability, the seasonal high groundwater elevation should be at least four feet below the bottom of the proposed absorption bed. As indicated previously, groundwater was encountered at a depth of 4.0 feet at the time of the investigation. In general, based upon the time of year that the subsurface investigation was completed, HBET believes that the observed groundwater reflects the seasonal high groundwater elevation. Therefore, in order to comply with the regulations, the bottom of the absorption bed will need to be at the existing ground surface. Seepage Bed Design The design of the absorption system generally follows the requirements of the Garfield County regulations. The proposed construction at the site is anticipated to include a three bedroom home. For conservatism, based upon the soil percolation rate, a Long Term Acceptance Rate (L TAR) of 0.35 will be utilized for the absorption field design. Infiltrator Systems Quick4 Standard Chambers are proposed in lieu of a conventional gravel absorption bed. In addition, due to the limited area available for the absorption bed and replacement area, the bed will need to have a large length-to-width ration. Therefore, in order to provide for uniform distribution of effluent over the length of the bed areas, HBET recommends a pressurized distribution system. The daily flow of the sewage disposal system is calculated below and a plan and profile of the absorption bed are shown on Figure 2. Average Daily Flow= (3 bedrooms)(2 persons/bedroom)(75 GPO/person) =450GPD Soil Treatment Area= (450 GPD I 0.35) =' 1,286 Square Feet Adjusted Soil Treatment Area = (1,286 SF)( 1.0)(0. 7) = 900 Square Feet #of Quick4 Chambers = (900 I 12) = 75 Chambers System lnstal/ati011 The installation of the septic tank, plumbing lines, Infiltrators, etc. should be completed in accordance with the Garfield County and Infiltrator Systems, Inc. specifications. In addition, the following construction procedures are recommended: • The septic tank and distribution box should be placed level over native soils that have been scarified to a depth of 8 to 12 inches, moisture conditioned, and recompacted to a minimum of 95% of the standard Proctor maximum dry density, within ±2% of optimum moisture content. However, up to 3-inches of washed rock or pipe bedding passing the I-inch sieve may be used as a leveling course under the septic tank and/or distribution box. X '1008 ,\LL rROIECTS\O l l7l • Mountain>iow Con•truttion SCf'·ico•'.Oll7l.0016 l.ul S Crcebide\200 • Gco'Dl27l-OOl6LR()(>ll16 ~uc 2 Lot 5 Creek Side #01237--0016 06/23/16 • The bottoms of trenches and backfill around the septic tank and distribution box which will support sewer or effluent lines should be compacted to at least 90 percent of the standard Proctor maximum dry density, within ±2% of optimum moisture content. Pipe bedding should have a maximum particle size of I-inch. • Vehicular or heavy equipment traffic and placement of structures should not encroach within I 0 feet of the septic tank or distribution box. /11spection Sclredule Huddleston-Berry Engineering & Testing LLC should be retained to monitor the construction of the OWTS . The following schedule of observation and/or testing should be followed: • Observe the absorption bed excavation prior to placement of Infiltrator chambers. • Observe placement of the septic tank , distribution box, and all connecting sewer and effluent lines prior to backfill. Verify proper fall between inverts. • Observe and verify installation of the absorption bed prior to placement of cover and backfill. • Observe squirt test to verify even distribution of effluent from pump. In conformance with applicable regulations, HBET will be required to provide Garfield County with documentation certifying that the OWTS was placed in conformance with the plan and profile and Garfield County regulations. General Notes The OWTS design was based upon the results of the subsurface investigation and on our local experience. The design is valid only for the proposed construction We are pleased to be of service to your project. Please contact us if you have any questions or comments regarding the contents of this report. Respectfully Submitted: Huddleston-er Engineering and Testing, LLC Michael A. Berry, P.E. Vice President of Engineering X ~00~ Al.I. PROJECTS\01271 • ~loonlainvicw Construction Scmccs\Oll7J.l'JO l6 Lot S Crct:b1dc~OO · Gc<>\0127J.OOl6 LR06lJl6 doc 3 FIGURES \ ' " /')~1•1' jJ · 1"\ '"-1· ~ l Setback Line Setback Line ~ TP-1 1016.9E 38.72' Replacement Bed ----8 -),· •Ii L -._, 1 =1 flt p ' ' '-'" i I -.......... __ . ' FIGURE.I~ Site Plan I FT MIN BURIAL .. BOTIOM OF BED AT EXISTING GRADP• SYNTHETIC FILTER FABRIC (140.200 MESll)OVER INFILTRATORS, TYP 12" l CH DIAMETER SEWER MEETING ASTM 01785, 2" SCHEDULE 40 rvc Ii" SCHEDULE 40 rvc :HEDULE 40 OR SOR JS AIN--J-_,.. ABSOR \IK OR COMBINATION OF TANKS ~IMUM 1.000 GALLON CAPACITY 'FILTER~ 4 Rows c--20.0 FT M1N:--------1 LENGINE~ o·-o· INFILTRATOR SYSTEMS QUICK4 STANDARD CHAMBERS 76.0FT IN SULA TED LID T FtG I:?" COVER MIN -__,.,,,~ 2" di:i. SOLID SCH 40 PVC TO MANIFOLD - 1i• INTO LEACH FIELD/IN FIL TRA TORS If• OWITH PERFORATION IN INFILTRATORS ""' n-Berry ·sting , LLC 1ue, Unit B co 81501 INSPECTION PORTS -120FT LOT 5 CREEK SIDE FIGURE 2 -SEPTIC SYSTEM PLAN AND PROFILE APPENDIX A Typed Test Pit Logs CD ;:; s I- 0 CJ s "' :::> I- ;!; CJ 2 CJ w Q "' " w w a: u ., I- 0 -' CD ij ~ N c; r/l z :Ii :::> -' 0 u :r ID J: u w ¢ w CJ @ . ~ Huddleston-Berry Engineering & Testing, LLC ~640 White Avenue, Unit B ~ Grand Junction, CO 81501 ~J 970-255-8005 970-255-6818 CLIENT Mountainview Construction Services PROJECT NUMBER 01273-0016 DATE STARTED _,6/::..1.:.;./..:.;16"'-----COMPLETED .. 61"""'"'1/-'-16"----- EXCAVATION CONTRACTOR __ c~l;:;::ie;;..;.nt~--------- EXCAVATION METHOD _T"-'ra=c=k-h;.::/Bo.::a~ck""h""'o=e-------- LOGGED BY CM CHECKED BY _.MA=..:.:B:....---- NOTES ___________________ _ :r u I-.-. :c Cl a..¢:: a..o w-~__, 0 Cl MATERIAL DESCRIPTION 0 .0 TEST PIT NUMBER TP-1 PROJECT NAME Lot 5 Creek Side Estates PROJECT LOCATION Rifle. CO PAGE 1 OF 1 GROUND ELEVATION -----TEST PIT SIZE------ GROUND WATER LEVELS: ~AT TIME OF EXCAVATION 4 .0 ft ~AT END OF EXCAVATION 4 .0 ft 5f. 24hrs AFTER EXCAVATION 4 .0 ft ATTERBERG I-w *' z ~ w~ LIMITS z a. w ~ ffi > cnw w a:-I-a:~ 3: I-::> a.. ~& :::>I-~ ~-wm we 0Z-' I-c:::-1-Z 91- u §~ _, :E >0 __,:::>~ w.!!! (/) w -... u~ oa: :r:::-:::> -=>- ... _ a. ::I mo -1-(/) ::::!! u -u ~ oz o~ 1-Q en :Ez w u~ ~ :::!!O ::::i _, :s ::::i cnz w ~ :s-z U) a: c u a. a. ii: .~·-·~ Silty, Clayey SAND with Organics (TOPSOIL), brown , moist !L".~ -... -. ·~----~ r,. '.,t11_ ... -=-·=----. ~.-:. -~ .~:. ... ~ :· ~·· 2 .5 ·7' . Silty, Clayey SAND (sc-sm), brown , moist to wet, medium dense ~: ... -~:· .. -~:· ~ .. : ·ir >--0· -~: ~ 5.0 0.: :%: ~· >--~· :z . ... -~: ~· ._ -.z · ~ .. -~-. 7.5 .'l ~· 0.:" ... Bottom of test pit at 8.0 feet. CD ;:; s I-c Cl :s "' ::i I- <!'; Cl ~ Cl w Q .,, ~ w w a: (,,) "' I- 0 .... ~ ~ N c; "' z ::i; ::i .... 0 (,,) % m x (,,) w 0 w Cl I ~ 640 White Avenue, Unit B S . ~ Huddleston-Berry Engineering & Testing, LLC Grand Junction, CO 8150 I 970-255-8005 970-255-6818 CLIENT Mountainview Construction Services PROJECT NUMBER 01273-0016 DATE STARTED .. 6""'/.-.1/.-16::;..._ __ _ COMPLETED ...:6.:!./.!!1/.!.:16::..--__ _ EXCAVATION CONTRACTOR ...:C:::.:l!::ie:.:.:nt,__ _________ _ EXCAVATION METHOD _T.:.,:ra,:oc=:k!:.:h::..:IB:::a,,,,ck,,,h.:::O::::e ________ _ LOGGED BY CM CHECKED BY .. MA~B::;._. __ _ NOTES ___________________ _ (.) :z: ~8 ...... _ MATERIAL DESCRIPTION a.ci:= w--~_. 0 C) 0 TEST PIT NUMBER TP-2 PROJECT NAME lot 5 Creek Side Estates PROJECT LOCATION Rifle, CO PAGE 1 OF 1 GROUND ELEVATION TEST PIT SIZE ------ GROUND WATER LEVELS: AT TIME OF EXCAVATION ...:d~lrvL----------- AT END OF EXCAVATION ...:d~lrvL.....------------ 24hrs AFTER EXCAVATION ...:d~lrvL.....----------- ATTERBERG I-w ";I. z ~ -LIMITS z a. w~ w ~ ffi >-cnw w a:: -I-a::-~I-=> a. t 'ii' => .... r: ~~ wm wo 0Z-' ...... C' 1-Z 91- u §~ _. :::!! >0 ...J=i~ W.l!! z a. U)W -1-(.)~ 0 a:: ~--::::>-::J-1-_ a. ::J a:iO -1-Cl) :::!! u-u > Oz o~ 1-c CJ> :i!z (.)~ 5:::i CJ> z < w 0 a:: ~o :::i _. 5-w CJ> a:: 0... c u a. z a. ~ ~: ·~ Silty, Clayey SAND with Organics (TOPSOIL), brown, moist 1·.~·J;.· .. :~ .... ~ ~·:~''' .,,,,. \.• ·~:-= ,~-.,\ i; ~·.--:-:-: ·'' '~· -.. ~ ~:#· Silty, Clayey SANO (SC-SM), brown, moist, medium dense 122 13 GB1 : Lab Classified 12 24 18 6 48 Bottom of test p it at 2 .5 feet IO ~ s ::; c:J 5 ~ !Z i3 .., ~ w 0 ;;; :.: w w a: u .... .... 0 _, IO ij .., ... ... 0 "' ~ cl u :r m :r u w .... 0 ~ ~ 640 White Avenue, Unit B @~ l-luddlcston-Bcrry Engineering & Testing, LLC Grand Junction, CO 8150 I 970-255-8005 970-255-6818 CLIENT Mountainview Construction Services PROJECT NUMBER 01273-0016 DATE STARTED _.6,..11 .... 1...,.16....._ __ _ COMPLETED -'6=/~1 /_..16-.... __ _ EXCAVATIONCONTRACTOR-'C=l=ie .... nt...._ _________ _ EXCAVATION METHOD _T""'r=ack=h;;.;:/B:;.:a""ck""'h""'oe=----------- LOGGED B Y -'C=M=------CHECKED BY _.MA=-"B~--- NOTES ____________________ ~ MATERIAL DESCRIPTION 0 TEST PIT NUMBER TP-3 PROJECT NAME Lot 5 Creek Side Estates PROJECT LOCATION Rifle CO PAGE 1 OF 1 GROUND ELEVATION ----- GROUND WATER LEVELS: TEST PIT SIZE------ AT TIME OF EXCAVATION _d""lrv.._ ___________ _ AT END OF EXCAVATION ""'d""lrv..__ ___________ _ 24hns AFTER EXCAVATION ""'d""lrv..._ ___________ _ ATTERBERG I-w *' z ~ --LIMITS z ll. w'#. w ~ffi >-en@' w a:-I-a:--3: I-::> ll. !:c-::::>I-~ z wm wO 0Z...J 1-c-1-Z 91-u o-- ...J== >0 _, ::> ~ W.!!! zu enW -... §~ o~ oa: ~-::> .!; ::::i-... _ Q. ::> mo -1-a~ en~ 1-0 :=z u -<.>~ 8 >-oz :5:; enz en c( w a: :=o :::i _, w en a: Q. 0 tJ ll. :5-z Q. u::: ."'~~-.--~ Silty, Clayey SAND with Organics (TOPSOIL), brown, moist ~.,\ : .- -~:~- "'Ii ·,, ~·--.. ,, ,\i; .-~ -,, ,~_."', ·~ - ti·.~ ~· .. -~ ~ .. ·%" ,. ~:-:· 2 a·.: -~-:· -~-:: t2~.· ::: -.. ,,. . ,. ,. Silty, Clayey SAND (sc-sm), brown, moist, medium dense Bottom of test pit at 2 .5 feet. co ~ ~ " 5 ~ ~ i3 § w c u; :.:: w w 5 "' b _, co ~ 0 en z § u iii :z: u w b /~~~,,.. l-luddleston-Beny Engineering & Testing, LLC ~~·JB•\ 640 White Avenue, Unit B ~' y Grand Junction, CO 81501 /;J 970-255-8005 ··-970-255-6818 '"="" CLIENT Mountainview Construction Services PROJECT NUMBER 01273-0016 DATE STARTED _6-....1..;..;.1/..._16"'-----COMPLETED .. 6~/.!!11..:.:16,,__ __ _ EXCAVATION CONTRACTOR .. c""l""ie""'nt,,__ _________ _ EXCAVATION METHOD _T._.rac=k,,_,h/Ba==ck"'-'h""oe""---------- LOGGED BY CM CHECKED BY ..:MA=B=----- NOTES~------------------- :r u ... _ :Ce> a..¢:: ll.o w-~...I 0 Cl MATERIAL DESCRIPTION 0 TEST PIT NUMBER TP-4 PROJECT NAME Lot 5 Creek Side Estates PROJECT LOCATION Rifle. CO PAGE 1 OF 1 GROUND ELEVATION ----- GROUND WATER LEVELS: TEST PIT SIZE ------ AT TIME OF EXCAVATION ...;d:::trv.1.-__________ _ AT END OF EXCAVATION ...:d=.lrvL------------- 24hrs AFTER EXCAVATION ...:d:::trv.1.-__________ _ ATTERBERG I-w ~ z g w~ LIMITS z ll. ~ ffi > II) w ~ w ii=-~ I-a=-~I-::> !:: '6 ::>I-z wm wO 0Z-' 1-c-1-Z Q1-u g~ o- ...I :E >0 ...I::>~ WJ!! z a. U) w -1-u~ ... _ a..:::> oii= mo ~-=>--1-::>-II) :E u-u ~~ o~ t-o (/J ~z u~ > :5 :i U)z UJ 0 a= ::i ...I :s-w ti) a= ll. 0 (.) a. z n. u: )~:··~ Silty, Clayey SAND with Organics (TOPSOIL), brown, moist ... ,~ .. ~- .to-.. :~ .. -~ ... -;.,. ·,•ii . --=-·-~- ... .\\I; ·,a -:-: .... ~ ... ~.: .. ~· ,, '~---~ 1 :i:-:~ '':' ~·. .. .. ·. ... -~:.:: . ... -~" -~· .. ... -~· ~-... ~ 2 @ Silty, Clayey SAND (sc-sm), brown, moist, medium dense Bottom of test pit at 2 .0 feel. ~.__.....___. ____________________ _.__ ........ ..___._ __ ___,, _ __.__...__.._~ _ __._ _ _,___, APPENDIXB Percolation Testing Results PERCOLATION TESTING Project No. 01273 -0016 !Test Pit No. TP-2 Project Name: Lot 5 Creekside Estates Location: Rifle Date: 6/1/2016 Testing Conducted By: __ c_._M_il_le_r _____ Supervising Engineer: __ M_._B_e_rrv ________ _ Pit Dimensions: Length ; Width ; Depth 2 .5 ft ---------------------------Water Level Depth: Not Encountered X SOIL PROFILE Depth Description 0-1 ft Siltv, Clavey SAND with Orc.ianics (TOPSOIL), brown, moist 1-2.5 ft Silty, Clayey SAND (SC-SM), brown, moist, medium dense Test Number: 1 Top of Hole Depth: 3 ----Diameter of Hole: 8-in. ----.,....--Depth of Hole: 18-in. Water Time Depth Change (min.) (in.) (in.) 0 12.125 10 12.625 0 .5 20 13.125 0.5 30 13.625 0.5 40 14.125 0.5 50 14.5 0.375 60 14.75 0.25 70 15 0.25 80 15.25 0.25 90 15.5 0.25 100 15.75 0.25 110 16 0.25 120 16.25 0.25 130 16.5 0.25 Rate (min/in): 40 Average Percolation Rate (min/in): Test Number: ------Top of Hole Depth: ----Diameter of Hole: Depth of Hole: Water Time Depth Change (min.) (in.) (in .) Rate (min/in): Remarks Test Number: ------Top of Hole Depth: -----Diameter of Hole: Depth of Hole: Water Time Depth Change (min.) (in .) (in .) Rate (min/in): PERCOLATION TESTING Project No. 01273 -0016 Test Pit No. TP -3 Project Name: Lot 5 Creekside Estates Location: Rifle Date: 6/1/2016 ~~~~~~-t1:::,_,,~=============-!1 Testing Conducted By : __ c_. _M_il_le_r _____ Supervising Engineer: __ M_._B_e_rry...__ _______ _ Pit Dimensions: Length ; Width _______ ; Depth __ 2_.5_ft ____ _ Water Level Depth: Not Encountered X SOIL PROFILE Depth Description 0-1 ft Siltv, Clayey SAND with Oraanics (TOPSOIL). brown, moist 1-2.5 ft Silty, Clayey SAND (sc-sm). brown. moist, medium dense Test Number: 1 Top of Hole Depth: 2 .5 ft Diameter of Hole: 8-in. --,,-..,--- Depth of Hole: 18-in. Water Time Depth Change (min.) (in.) (in.) 0 10.5 10 11 0 .5 20 11 .5 0 .5 30 12 0 .5 40 12.5 0 .5 50 13 0 .5 60 13.5 0 .5 70 14 0 .5 80 14 .5 0 .5 90 14.875 0.375 100 15.125 0.25 110 15.375 0 .25 120 15.625 0 .25 130 15.875 0 .25 Rate (min/in): 40 Average Percolation Rate (min/in): Test Number: ------Top of Hole Depth: ---Diameter of Hole: Depth of Hole: Water Time Depth Change (min.) (in .) (in.) Rate (min/in): Remarks Test Number: ,....------Top of Hole Depth: ----Diameter of Hole: Depth of Hole: Water Time Depth Change (m in.) (in.) (in.) Rate (min/in): PERCOLATION TESTING Project No. 01273 -0016 rTest Pit No . TP-4 Project Name: Lot 5 Creekside Estates Location: Rifle Date: 6/1/2016 Testing Conducted By: __ c_._M_il_le_r _____ Supervising Engineer: __ M_._B_e_rry...___ _______ _ Pit Dimensions: Length ; Width ; Depth 2.0 ft --------------------Water Level Depth: Not Encountered X SOIL PROFILE Depth Description 0-1 ft Silty, Clayey SAND with Organics (TOPSOIL), brown, moist 1-2 ft Siltv, Clavev SAND CSC-SM), brown . moist, medium dense Test Number: 1 Top of Hole Depth: _2_ft __ Diameter of Hole: 8-in. ---Depth of Hole: 18-in. Water nme Depth Change (min .) (in .) (in.) 0 10.875 10 11 .375 0.5 20 11 .875 0.5 30 12.375 0.5 40 12 .875 0.5 50 13.375 0.5 60 13 .625 0.25 70 13.875 0.25 80 14.125 0.25 90 14.25 0.125 100 14.5 0.25 110 14.625 0.125 120 14.875 0.25 130 15 0.125 Rate (m in/in): 57 Average Percolation Rate (min/in): Test Number: ------Top of Hole Depth : __ _ Diameter of Hole: Depth of Hole: Water Time Depth Change (min .) (in .) (in.) Rate (min/in): Remarks Test Number: ------Top of Hole Depth : ----Diameter of Hole: Depth of Hole: Water Time Depth Change (min.) (in .) (in .) Rate (min/in):