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Home My WebLink AboutOWTS Design Report 10.24.16Huddleston-Berry En11inccrini;& Tcsti ~. l LC Tally Ho Construction 0145 County Road 225 Rifle, Colorado 81650 Attention: Subject: Jeff Parrington OWTS Design Lot 4 Creek Side Estates Rifle, Colorado Dear Mr. Parrington, 640 White A\cnuc Grand Junction. Colorado 81501 rhonc: 970-255-8005 Fax: 970·255-6818 Info R huddlcstonbcrr)'.com October 24, 2016 Project#O 1150-0003 At your request, Huddleston-Berry Engineering & Testing, LLC completed design of an Onsite Wastewater Treatment System (OWTS) for a single-family residence on Lot 4 of the Creek Side Estates subdivision in Rifle, Colorado. A site plan is included as Figure I. Site Description At the time of the investigation, the site was generally open. The upper (western) portion of the site was fairly flat; however, the eastern portion of the site sloped down gently to the east. Vegetation was minimal due to recent site work. The site was bordered to the north and south by existing residences, to the west by a shared driveway, and to the east by a creek. Subsurface Investigation In order to evaluate the subsurface conditions at the site, three test pits were excavated in the vicinity of the proposed absorption field to depths of between 3.0 and 6.0 feet below the finished grade. The test pits generally encountered brown, moist, medium stiff silty clayey sand soils from the ground surface to the bottoms of the excavations. Groundwater was not encountered in the test pits at the time of the investigation. The soi I profile is shown on the percolation testing logs included in Appendix A. Onsite Wastewater Treatment System Percolation testing was conducted in the test pits in accordance with Garfield County regulations. The percolation rate in the native soils ranged from 13 to 20 minutes-per-inch, with an average of approximately 16 minutes-per-inch. 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. Lot 4 Creek Side #01 ISO·OOOJ @ Huddlmon·Bcn} l11aWnle1.lrNlti\s,UC: I 0/24 /16 - 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 not encountered to the depth explored of 6.0 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 seasonal high groundwater elevation in the vicinity of the proposed absorption bed is deeper than 6 .0 feet below the existing ground surface. Seepage Bed Desig11 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 five bedroom home. For conservatism, based upon the soil percolation rate, a Long Term Acceptance Rate (L TAR) of 0.60 will be utilized for the absorption field design . Infiltrator Systems Quick4 Standard Chambers are proposed in lieu of a conventional gravel absorption bed. 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 = (5 bedrooms)(2 persons/bedroom)(75 GPO/person) =750 GPD Soil Treatment Arca = (750 GPO I 0 .60)"" 1,250 Square Feet Adjusted Soil Treatment Arca = ( 1,250 SF)( 1.2)(0. 7) = 1,050 Square Feet #of Quick4 Chambers= ( 1,050 I 12) = 88 Chambers System ll1stal/atio11 The installation of the septic tank , plumbing lines, Infiltrators, etc. should be completed in accordance with Garfield County regulations 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 scari fled 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. • The bottoms of trenches and backfill around the septic tank and distribution box which will support sewer or efnuent 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. • Ve hicular or heavy equipment traffic and placement of structures should not encroach within I 0 feet of the septic tank or distribution box. X ~008 ALL PROIECTS '.01130 ·Tolly llo Conmu<tKJn'Ol lSO.DOOJ Lot~ C1cel11de'?OO • G<o'.011 SO-OOOJ LRIO?llo do< 2 Lot 4 Cn:ck Side #01150-0003 10124 116 Inspection Scltedu/e ® Huddlfflon·Bcm- ""'Wns.1.a ,.,........_.._., . 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 Jines prior to backfill. Verify proper fall between inverts. • Observe and verify installation of the absorption bed prior to placement of cover and backfill. In conformance with Garfield County regulations, HBET will be required to provide Garfield County with documentation certifying that the OWTS was placed in conformance to 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-Berry Engineering and Testing, LLC Michael A . Be rry, P.E. Vice President of Engineering X lOOS ALL PROJECTS'·Ol 150 ·Tolly !lo ConstructK>n'.Ol l SO·OOOl Lot 4 Crcc~sode\200 • Geo'.01150.(JOOJ LRIOll 16 do c 3 FIGURES '• -I -·--: I . . ... ...,_, .. .,., ---: -····· ..... _ ·-. ·------' :' ·~.:~.--,-~~·---:~~: .. \"'--'~-~ -----~-~. Ll~~~~.:·.=:~.~-:, ........ ----····· ·--·--· ····--1 _../ ··\~";----~--:o.·----·--; -~-· ------TP·~~. "\~P-2 ·... :, .. ' " ' ..... '> ., . .-/\ TP-3~ .· , . i . ,. \ » Absorption Beds , . ! ' A ' : / ' . .--. ..... , ' : .. : ..--, ·-'-. I .... ............... .-. ~ , , .... : . .-· < '. ' : -· ' ' ---' ' i. ___ ,... ' / :: .-----' / ........... ........ · .. ·. '•. · . . '• '·.. ---' , ··----~ ... ............... ..._ ___ .,.,.,- ', ......... · ......... Replacement Area ........... ·-. ·,_ ......... '• ·-. ~ . ... .......... .. _ '· .,_ '·. "· ' ...... ·····-... _ · ........ '• .. , '· ................. ' "' ... ! TALLY HO CONSTRUCTION INC ,-.. Cl.UI"-~ .... """'""' .... ~.r"l~Mof . .......... .:.__ . .,......._~. ~ & ! FIGURE 1 Site Plan JEl"' P ... R"11"6TON 11tESID ENCE ~•~l~U·•Tt1 11r..sc:.:::t-.~ """ _..,_. _J Cl.I J_ j fTt.•AAPl"k.l'L ·~· I -.on '~"~,., lJIM ABSORPTION BED PROFILE GkA.0£ 10 O~.\IS A~'AY rRO\t om ;:UUOl!Stt \ £GfTATl\<:CO\f• MO! IOSCALE Pl"{'~F'ILL \tl\nRJAt • 'lAlf\·t.:.oA F '-GINUit .\f'f'~O\'lO AL lJ.l'; • .\Tl\'£ ~ ~~~~~~~~~~~~-t-~~~~"41fTMN~~~~o+-~~~~~~~~~~~- GENERALIZED SYSTEM PROFILE ABSORPTION BED PLAN SCALE (FT) rs----! 0 2 4 6 s 10 '>() RtSIDE'HIAL ~TRLcnO\£ ~ISE!l5 iAS XECF.S§ARYr 5l1Cll TllA T LID~ ARE AT OR ,\UO\'E 1 lt-.ISllf.0 G RAD !: .en·.c1t.co..-o JI [ '''G'-I ! , ' ' o·u•rt.t.-CJ>.Tu~-u L=?~Y~•.::d .,... .. U.'-C" r~ ,., &l .,, 'it.Im: I'"''- !':Fil rRA TOR ~ YSTT MS QUICK• ST A 'DARO C!IAMDtR S e-~~~~~~~~~-~an MN~~~~~~~~~~~ OISTRIUL'TI OX DOXF.S THAT f>;Sl!RE F.Vr.N OISU IRrmo~ or r.rFl.t;f""T \ •-l"Cll OIAMf.T(R Sf\\ I 'l ""Dfrtll r~.rM?F. \ll.l.l I"-<. A~H.I U17i~. / /SCllH>t.lf.'IJOR SUR H Ir ~,,__,, .. ,,, .. _ , I _.....__. ----4 SEMlC TAt.:K llR C'O~IDINA TIO~; llf TA -.;1(5 W!TJI \U:-;l'.tl \! l .!OOCAllC'XC\P,\CITY Project No.: 01150-0003 Date: !Of24 f l6 By: MAB RESIOEl\TIAL STRLClt;RE Hudd.leston-Bcrr:r [n~:n-:-t r:,1::,,': T;:~riti.~. tt.C 6-111 White A"e11ue. Lnit [I Grand Junchon. CO 81 SO I N;ILHtA JOR: <llAMUlMr.; urs11un11no' oo~·.· \ ,,,, ""l 0 fi OLLOW f.\ISTl."IG GkAl)! \t •:I. •· LOT ·I CREEK SIDE FIGCRE 2 -SEPTIC SYSTE~I PLAN A'.'lD PROFILE· APPENDIX A Percolation Testing Results PERCOLATION TESTING Project No . 01150 -0003 Test Pit No . TP-1 Project Name: Lot 4 Creekside Estates Location : Rifle, CO Date : 1011012016 ~~~----~~1b::=====================:!l Testing Conducted By: C. Miller Supervising Engineer: M. Berry --'--------_____ ....._ _______ _ Pit Dimensions: Length ; Width Depth 3 Ft -------Water Level Depth : Not Encountered X SOIL PROFILE Depth Description 0-3 Ft Silty Clayey SAND (sc), brown, moist , medium stiff Test Number : 1 Top of Hole Depth : 3-Ft Diameter of Hole : 16-in. Depth of Hole : 20-in. Water Time Depth Change (min .) (in .) (in.) 0 2.25 5 2.875 0.625 10 3.5 0.625 15 4.1 25 0.625 20 4.625 0.5 25 5 0.375 30 5.375 0.375 - 3 5 5.75 0.375 4 0 6.125 0.375. 4 5 ~ 6.5 0.375 50 I 6.875 0.375 55 ' 7.25 0.375 60 7.5 0.25 Rate (min/in): 14 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. 01150 • 0003 Test Pit No . TP-2 Project Name: Lot 4 Creekside Estates Location: Rifle, CO Date: 10/10/2016 ~~~--~~-i=================:=!! Testing Conducted By: __ c_._M_il_le_r _____ Supervising Engineer: __ M_._B_e_rry......_ _______ _ Pit Dimensions: Length ; Width ; Depth 6-ft -------W ater Level Depth : Not Encountered X SOIL PROFILE Depth Description 0-6 Ft Silty Clayey SAND (sc), brown, moist, medium stiff Test Number: 1 Top of Hole Depth : 6-Ft Diameter of Hole : 16-in. Depth of Hole: 16-in. Water Time Depth Change (min .) (in .) (in.) 0 1.75 5 2.375 0 .625 10 2 .75 0 .375 15 3.125 0.375 20 3 .5 0.375 25 3.75 0 .25 30 4 0 .25 35 4.25 0 .25 40 4.5 ,0 .25 ~ 45 4.75 0 .25 50 5 0 .25 55 5.25 0 .25 60 5 .5 0 .25 Rate (min/in): 20 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. 01150 -0003 Test Pit No. TP-3 Project Name: Lot 4 Creekside Estates Location: Rifle . CO Date: 10/10/2016 ~~~-'-~~"f'======:ii============ll Testing Conducted By : __ c_._M_il_le_r _____ Supervising Engineer: __ M_._B_e_rry.._ _______ _ Pit Dimensions: Length ; Width Depth 3.5 Ft -------Waler Level Depth: Not Encountered X SOIL PROFILE Depth Description 0-3.5 Ft Silty Clayey SAND (sc), brown, moist. medium stiff Test Number: 1 Top of Hole Depth: 3.5-Ft Diameter of Hole: 16-in. Depth of Hole: 18-in. Water Time Depth Change (min .) (in.) (in.) 0 1.75 5 2 .5 0.75 10 3 .25 0.75 15 3.875 0 .625 20 4 .375 0.5 25 4 .875 0 .5 30 5.375 0.5 35 5.875 0.5 40 6 .25 0 .375 45 6.625 0 .375 50 7 0.375 55 7.375 0.375 60 7 .75 0 .375 Rate (min/in): 13 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):