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HomeMy WebLinkAbout1989-12-11 Septic System Design Reportw V ■J k SYSTEM DESIGN FOR BRUCE COMPANIES OF THE CHIP FISHER RESIDENCE IN TRACT C, R.L.S. ltl35B ORONO, MINNESOl’A DECEMBER 11, 1989 Information follows for the installation of a pressure mound system. In addition to those requirements, two septic tanks of at least 1,000 gallons each are needed along with a pumping tank of at least 1250 gallons. All construction and materials must adhere to the provisions of the City of Orono. All grading and construction traffic must be kept off both the primary and the alternate septic system sites. Runoff water should be diverted from the mound area. If any additional information is needed, please contact me. Sincerely, PERCOR, INC. Mark S. Gronberg PCA certified MSG/lh (prcr) 'i 1 i 1 -fe-' L/-C \i-o \< ^ J A X ^74.i ':rs X fcsfi^-j-m.* ■ t V Cy ^ yvu.'/^'\r” / v^f _ ‘'•' \ I / . . i>jr / P C\\ 'yi»>•4 /'f.uiY*\V /(f/’r/c •i r/#/y?l« '‘•/i '<y/ •\r^f/t/A'r ii**>77 ,UJ'‘- f /)t ,r F«<e .(Vr.7J «/ \\\Vyyu4f\\\ \ :>^„ \\\;......■ . ' .. Lif^^ b^^w&Ad \ j I of Keti«£v \ ' / \ * \ \V f«ff \> _ \-iO \i.K \P^ce-s \\ X /? \ \€\ »»v I,\\' ., X/ \N \»\ \ A/\ \ ‘‘J\%f 'XpV •./ ‘ \V "f \ \/V T.V C'N \ \SP-.9 <\ \N \/z //•/?\\/> Sif/ -•*. ;t: >■ r ip; E7It- :«■ i\ m; f'" b'.•;...v:;;\. I;-- V:;.. 5*. S5;v; m mi:^ rt F; f4i ■ " 'I ' '. .■! !UH .1 . -,I . !-■" L. i'^r,i'; ’/■ ■^'/yyCf- Oy^Z/V/. vr E-19 • •: '\:.''Vt?'MOUND DESIGN PROCEDURE (For Flows up to 1200 gpd) A. Sewage Flow Rate Sec D-7 or 1-3, 4, or 5, or use metered value; Flow Rate gpd m y F. Pressure Distribution System Select number of perforated y laterxils ^ ^ 1. 0^'M- ■{ :f. Vp'* 1. B. Septic Tank Liquid Volume (see C-3 or C-5) M^Tisllons ,fo^ -looet^izxo 2. Select perforation spacing - •=? ft / C. Soil (niarscceristlcs •k /kUAft^ 1. Depth to restricting layer such as seasonally saturated soil, bedrock, coarse soil, etc.; 3H inches 2. Depth of percolation tests; inches 3. Number of percolation test 5 holes 4. Ave. percolation rate; /2\ 3 mpi S. Landslopc 7 X y D. Rock Layer Dimensions' 1. Multiply gpd by 0.83 to obtain required area of rock layer; 9££_gpd X 0.83 - 75‘g2 sq ft 2. Select width of rock layer (10 feet or less) ■ feet 3. Length of rock layer - Area - Width 22£.»q ft - ft * / - 75^<? ft * y E. Rock Volume 1. Multiply rock area by rock depth to get cubic feet of rock; 7 5^ sq ft %, O.'fS lx. •S^J.ScM ft 2. Divide cu ft by 27 cu ft/cu yd to get cubic yards; Jj , 3. Multiply cubic yards by 1.4 to get weight of rock in tons; 7^.;r?cu yds X 1.4 - 2?. //tons m 3. Selerr perforated lateral If uot.., Note if manifold is at end of rock layer, lateral length is rock layer length less half a perforation spacing. If manifold is in center of rock layer, lateral length is one-half rock layer length leas half a perforation spacing. Perforated lateral length « S C ft. X 4. Divide lateral length by perfor­ ation spacing to get number of perforations per lateral y?, 5> feet f 3 feet - perfs Note: last perforation must be in end cap, (see page K-14) 5. Multiply perforations per lateral by number of laterals to get total number of perforations; /S pcrfs/lat X j£_lats » "JSL iP‘n 6. Determine required flow rat by multiplying number of perforations by flow per perforation (see page E-1 ytf perfs x^.y/gpm/perf 7. Select minimum required lateral diameter from table on Page E-17; enter table with perforation spacing, perforation diameter, and number of peri'ox n *^.ions per lateral. Select mir.^. diameter for pjy>#crrfflp d in incifes 2,^*t C. Basal Width 1. Percolation rate In Cop 12 inches of soil is /^. 3 mpi 2. Select allowable soil loading rate from table on page E-lb;4 VJ E) l(y O, fTc? Rpd/ft^ . ■f y, : rri'':- E-20 ■ r • i ■■ . .■ tFV '> ■ MOUND DESIGN PROCEDURE (Continued) (For Flows up to 1200 gpd) '••■X :0 ?? i- hr 1-^ f- ’ ;• c.3. Calculate basal width ratio by dividing rock layer loading rate of 1.20 gpd/ft^ by allowable soil loading rate; 1.20 gpd/ft2 "^.%pu/f ° 2MC Check this value on page E-16. 11.2,f. Multiply dike multiplier by downslope mound lieight to g . down slope dike v/idth; y -57 96' X >’. 7 * la. ^ f t R U, Multiply basal width ratio by rock layer width to get required basal width; :< iO ft - Vi±iri Compare the values of step I!. I ajid step Select the greater of the two values as the downslope dike widtli; ?0, 6 feet m H k H.Downslope Dike Width 1. »V'; ■' ':.c' ; ■ If landslope is 3Z or more, subtract rock layer width from basal width to obtain minimum downslope dike toe width 2y.<P ft - ft - /y.^ ft 2. Calculate mound height at edge of rock layer on downslope side; .a. Determine depth of clean sand fill at upslopc edge of rock layer: / feet b. Multiply rock layer width by h. Calculate upslopc dike width using upslope mound height and upslope dike multiplier y ^from pagc.^E-lB; c>. yft i. Total mound width is the sum of upslopc dike v/idth plus rock layer width plus downslope dike- width; y ■?,‘f ft + A* ft +.’<^.6'ft » VO ft y . .1 ■ .r 3.If landslope is 2.') percent or less, basal width includes both the upslope and downslope dike widths. ■f. landslope to determine drop in elevation; /O X “7 X - 100 •Os / ft a. Calculate downslope dike wid using stops n.2.a. through H.2.f; _ _ _ _ _ _ _feet 6 ’c.Add drop in elevation to depth of clean sand at upslcpc edge of rock layer to get depth of clean sand at downslope edge . of rock layer. g, /ft + / ft “ Ay ft d. Add depth of clean sand at down- slope edge to depth of reck layer to depth of soil backfill to get mourd height at downslope edge of rock layer; b. Calculate upslopc dike width using upslopc mound height and dike multiplier from Page E-18; f t = ft ■■-■'I X c. Add downslope dike width to upslope dike width to rock layer width to get total mound width; ft + ft ft » ft ".'i- ■ ■■ uTM . /.V ft d-.7^ft + /.^^ft - 7Jt e. Enter table on page E-18 with landslope and downslope dike ratio. Select dike multiplier of jsr. y.v r- / d. Compare total mound width to required basal width from step G.4. If total round width is greater than requivt-d basal wid*"!!, use calculated dike widths. If required basal width is greater than total mound width, Incroaeo downolopu dike width. m m .'i •:oVi -'M ms,W- ■r. ■;« A.r' 1. 2. 3 B. 3. ■ * i 4. C. D. K. 1 .,i '•■ ■ri 3. It-. 4 .i V- :«i m . » Cf,Hf’,'.'.‘ • -;-I F-15 V PUMP SELECTION PROCKOURE Decermine pump capacity; "4:' Minimum suggested is 600 gallons per hour (10 gpm) - to stay ahead of water use r;itc Maximum suggested for delivery to a drop box of a liome system is. 2700 gallons per hour (45 gpm) to prevent buildup of pressure In drop box Use value from design of pressure distribution system SELECTED PUMP CAPACITY . Determine head requirements: gpm .y- 1. Elevation difference between pump and point of discharge V feet ^ 2. If pumping to a pressure distribution system, add 5 feet ” 5for pressure required at manifold Friction loss a. Enter friction loss table with gpm and pipe diameter. Road friction loss in feet per 100 feet from page F-18. ft/100 ft b. Determine total pipe length from pump to discharge point. Add 25 percent to pipe length for fitting loss, or use a fitting loss chart. Equivalent pipe length ■ 1.25 times pipe length -1.25 x /2 S - jS€ Calculate total friction loss by multiplying friction loss In fc/lOO ft by equivalent pine length. 2.C*f y Total friction loss “ _ _* ^« i/ feet ? feet Total head required is the sum or elevation difference, .special head requirements, and total friction loss. _ _H._ _+_ _S,_+ _ TOTAL HKAD Pump selection 1. To maximize pump life iSe operations per day. A pump must selected to with at leask //. / fe< liver at leas of total head? cct sump size for 4 feet iXtL.foot "i gpm 5 pump Calcuijcc tlralnback Detorml«ic total |)i|>e Unigth. feet. Determine Llcpiid volume of <lpe, / 7, gallons per 100 feet. (See page I'-IS) Multiply length by volume: !)rainhack (ju.intlty /2-S feet X gallons/lOO fc - 2 Suggested dralnbnck quantity is 10 percent of pumped quantity m gallons A larger drainback percentage will decrease pump station efficiency- slightly but pumping energy costs are usually a relatively small part of the total household energy costs.i- . r :.-•J .J A. :*1 ^ X V’ -fx \ ■■ ^- -I. ':■] I h-‘ frf »«— ^^OO fpy -^Tl mSTALLBR.•.* :; A. mSSDRB DZSIHIBOTIOII SYSXBI IKMIKSBBBr - RBSIDBMTIAL of laterals _^2—®i B. Parforatioa ^etng __3_f£® C. Bock layer lenytb'SQfJt less 2 ft ■ 3g'.S*tt© (total length if end load! (% total length if ctr loadX- -* perf's ■ ©/®- /2- spaces@Dof mpmemm Mm Itanter o£ p«rf'• p#r lateral •(§)♦ 1 ■__/lat. (g) F ttotal parforationa “(J)*®" *70 partorationa® Flow rata par parft If 1/4* parfa, uaa 0^6. gymim^an MQQIIUB) FLOW RATBS (1/4* parfSg 3* spacing) Rock Bad Langth Fatal # parfa BBQ'D eSPM 37.5' 3 34 26.6 **•* 40.0' 3-MOt 39 50.0' 4 51 55.0* 4-M0% 54 63.0* 5 60 70.0* 5-f10% 72 28.8 **** 37.7 **** 40.0 **** 44.4 **** 53.3 *•** (Reduce 6PN by 25%) TO RBDOCB RBQ*D FMW BAFB: 1. Uaa 7/32" parfa instaad of 1/4* OR 2. Baduca nuidbar of parfa by increasing spacing between parfa (Naxiwiai apacing allowad - 5.0*) (Re-calculata A thru B) mXUiail ALLOWED PBRFS PBR LATBRAL : > '5 5 I v^'.: ■ ■~A IEnd load Center load Berf spacing, ft Lateral dian.: 1.5" 2.0" t 1.5" ^-0'.2 m *142.5. . . .-. . . . . . . .1« “ I 3.0. . . . . . . . . . . . . .” 26 I 9 139 13253.3- - - - - - - - - - - - - - - -’* 4.0. . . . .. . . . . . . . . . .’5 5.0- - - - - - - - - - - - - - - - *12S B23 *11722I* SIDB 1 OP 2 ill c' ‘ ' .....-‘T* ' •■; li V r. F i t >M..r- i. ■ ■ . , . k ► i :|.: C'.' . )■■ r •■ \ % K ' >■■■ ■■"■T i,»4:m,,^ v_-— ■»»«« 4iW< .*■ *' ■; J„ .••:?' • ■' :' ■■' *.;:■■•:■ ";:i it minm •'I* *8 J.t ^sy FT j-i ■3 e:rr j-2 DzmancB (j-i ■imw J-2) <n«r. OBM))® K. Diacnan un uann (paNr-«o-«ANiraLD) /2o ft l/^ii~Dj!ifc»lMI (BnMBBi POMP te 2" typ.J AMD MMIPOLO) paicnoa ims pb 100 pt op pipbs (PMcnoa LOSS xm pt/ioo pt, pvc) M'S GUI ****** ***** 1.5" PVC 3 3*%0% 4 4<l>10% 5 54-10% 24.6 24.0 37.7 40.0 53.3 4.21 4.07 8.01 8.91 10.81 1.25 1.44 2.37 3.20 4.50 ■i; f *2,2-. PT/IOO PT <§) 1.25 x@x(^/ 100 ■ HBM) LOSS DOB TO PIPE FRICTION 1.25 » iUL. * 3.2, / 100 - I ^.‘8»Ipt 0 ipff L. ADO 5.0 PT B» D«PIIIITIOII POR lOSSBS III tATBBALS/IIAHIPOLD i TOTAL BIAD UQOlRBIBaT - 5.0 +0-1-0 - 5.0 ♦ ^ + *7 NININDM RBQOIRBD POMP RATING: GPN AT / ^ FT TOTAL HBAD lA*** mmm-m:c mm isM SXOB 2 v/'•: *ct «S ■ --A sm M—— .^7^ Ii:I h. l mssmti DZsniBUTioii system morkshbet * residemtxal of latorals ^ B* Torforatioii spociiig ^ ft:^ C. Bock layor loogtliless 2 ft • 3^*^ft@ (total looftli if and load) j.;ih t€»tal length if ctr loadX* f«:r- D* Buniior of apaoaa batoaan perf*a • ©/(§)• /2> spaces B. Buster of perf*s |ier lateral •@*t' 1 « ) 3 • perfs /lat. @ F Total perforations *70 perforations^ 6. Flow rate per perfs If 1/4* perfs# use 0.7^If 1/4* perfs, use 0»7i.4ff^ if 7/32* perfs, us^^oTss g^ ^jT f jT *****^ B. B««alr«d flM rat* - ®a (§) ) t I ai«D rum hates (1/4" parCs, 3* apacin,} Si i it® Bock Bed Iiength Total # perfs BBQ*D GPN 37.5» 3 36 40*0* 34-10% 39 50a0» 4 51 55.0» 4-I-109 54 63.0* 5 60 70.0* 54>10t 72 26.6 **** 28.8 37.7 *•** 40.0 **** 44.4 *••• 53.3 **** TO REDOCE BB0*D FLOW BBTEt 1. Use 7/32* perfs instead of 1/4* (Reduce GPN hy 25%) OR 2. Reduce nunber of perfs by increasing spacing between perfs (Maxinun spacing allowed - 5.0*) (Re-calculate A thru H) NRXlfRBI ALLONBD PERFS PER lATBRAL : Perf spacing, ft End load Lateral dian.: 1.5* iI,- .... ly . 2.5- - - - - - - - - - - - - - - - -18 3.0- - - - - - - - - - - - - - - - -17 3.3- - - - - - - - - - - - - - - - -16 4.0- - - - - - - - - - - - - - - - - -15 5.0- - - - - - - - - - - - - - - - -14 2.0* t 1.5* ! » Center load 2.0* * 28 26 I 9 25 I 8 23 S S 22 S 7 14 13 13 12 11 m SIDE 1 (V 2 ^ m M ■- .iW. ■ I'-*-- J PERCOLATION TEST DATA SHEET Tc«lioleloc»tion-^<f<y^£ ---------Hole number____/ Dale hole wa.pn-pan.^ Ifi'-’if-j’J Depth of hole bottom-,.. / ^ .inches, Diameter of hole____^2___inchcs Soil data from test hole: Ui Depth, inches Soil lexlurc JIL^- \^ y ^ •Vy r 1;.V; ^ ; V; Method of scratching «idewaii Depth of gravel in bottom of hole.2L -inches Date and hourof inilial water tilling^, 3^/ f.P,Dtpth of iniiial water miing__ /.4_inches above hole bottom ■i Method used to maintain at least 12 inches of water depth in hole for at least 4 imurK £ F f L 1 iaximuni water depth above hole bottom during tPKt t 0 Time interval, minutes Percolation rate, minutes per inch Tire Measurement, inches Drop in water level, inches Kcmaiks n, L L Fu LL-2^ (o :/ '1^, ^ r V;\r 7v*</?//1 >;/y r; a. 2/1 ~ ? 3.30 /' ‘ /} i it II// a V •/ V 7"<%iU..2> D /• t ■LilV [i j ■: ?■;., fr Vn:. w fiereolatioa rate » ItL i l----minutes per inch. ::/n K/ brr. • ' , V' .■ ■''' VvtT . ■ I ' '»- V'-MW?: 1; .:»w? KRCOLATION TEST DATA SHEET 5 mW ■s .J>J j>-m.Niwlrt«mmftdlmii<tby,Z?Ad/ Staftingat Itetnil >"«-**—> CsM/ Cr. , Hole number . ,2______ Date hole was prc|)ared **>. V “*f^V Ptpdioflwlebodiom inchea. Diameter of hole Jnehes SoU4atafiPoai test bole: Depth, inchei A-^ f J Soil texture ^ - • ^''': /t.'- /r - >. . • ** L P 1 / ^ V ■1 •>■ ':i %■ '£r k:\ IMbodor«enidrii«iidt«rtll__if.H^'TcJl f/K Dlpdi of fravd in boiton of hole li Dole andhour of Initial water filling fCtJP^ ^/jDeplh of initial water filling----Li2-------inches above hole bottom Method used to maintain at IM12 Inches of water depth in hole for at least 4 hours—.4*,^ . v/ Maximum water depth above hole bottom during test , —<nct^ i^s I i J Tune Time interval. mimnes Measurement. inches Drop in water level, inches Pcrcolatioa rate. minutes per inch Remarks ■m i2iaiiL FnLi 11 JbJ± r^y f / I L /' net %%Ip It h / V 4 Vr n •;nT 0 — •' /‘: '^1 y. CL !• li V~ ^ rl,C 'l V f V '> 4U1 r I I c % - /. %;/f '.1 .>>’• ' . -i s ■i m 0 vi; —5 'h r • ^» ;.“if '/■ X ima " / y / i ■liiautaa per inch. ' .Aw.. na ■A 'i f iV ■ ’ jl;I 4-'-■■■;;';*,.»■f:. ^r' :■•>. reRCOLATION TEST DATA SHEET p* 4 /rgfN bt:t:i--------on/g-^/’^-iwingw-------------- At.^r tsuxT_______ Hole narabw___3.------Dale Me w» piepawl (0--^f~S‘i plj^,^lyftr‘‘***~'* !-■**• r>t.«»ofofhnl> .6-------inches “'g v'<g;'V' ;.'• g;':^} g.g-- ':' g ■ ,'■ MdMbamlMhoii: Deflh. inches -w 0-fy- Soil texture g:/. IMwdortCfaichiiifiidewall—Jf0/t TcJj£^ ,i lkpihofiwvdto»»nomofholf JL ri’f^ DM. nd hour or inMsI ^ ““ ^**'* '“'* Milhnil mrit lit n-’—-’* •*'**"''*‘~***‘^'****'‘'™***F > ir ^ , , Maximum water depth above liole bottom during test . ., —inclkw' | j gkg u 4 Pcfcotauofi rate. minutei per mch N-Hiiie RemaifcaDrop in water level, inches Mcaiuitiiieiit. incliet interval.Timeg- l! k.r •r-Fif L Lta.jo t\ f -nLJ£ls •r-473.> %. •-• ' •P ! it)r ’ik '7 I •?.,U,/V/I M ^ 'III •» i V /.'? •:iQ.n7—*r\Ulllbif»li! b S'.. gg'* y mtnuieanef inch amititoisi .. :y Si V •••■ dL ■. •'.. # ■'"'iid' WM, ?v m ^■' -.M, d^‘1 • '• y « • I- v ^ % TOCOLATION TEST DATA SHEET id: t;\.- ■5 ^aAJsf^ Hole number—^---------- Date twlc was pct| tbuboltlociiioii .inchesDtptfiorholebociom-....Z2-----Inches. Diameter of I Soil dau from test hole: Depth, inches * Soil texture ^ —A /V • A I- ______ ..nU p.ni ■k ■■{ 1 ■ ■ r \ : • ■a:- ■ /■ 't 4 /. ’ Method of acraichinf sidewali Depth ofiravel in bottom of hole— Dtfe and hour of initial water Alf. Depth of initial water filling—Lis-------inches above hole bottom Method used lo maintain at least 12 inches of water depth in hole for at least 4 hours—Lr..L ■di Sf, i , Maximum water depth above hole bottom during test J ^ It----Inclk.^ Remarks ^ Percolation rate. minutes per inch &Time interval.w-'Drop in water level, inches Measurement. inches Time Wi ^ If i . 'full n- r ;/. ?// / 3.^¥.*> -I V < /' ; >/ I •> */ /. . .. 7. •• V V .ilM tm - / Y per inch ‘,;4‘ m \ ...$ t’I - TMitoltInrilInn fifllC/T -------- mtCOLATION TEST DATA SHEET :^S-. yn «" 90^^ Parting at \*m% p.m. _ ______p_____________ Hole number. Oiydiannic bottom—££:-----loebot.Dtaimerofhole------A---- loOdMobomlMliole: Date hole was preparrd ^ -inches Depch, inches /o Soil texture ■ /‘r rj^ yj-ISiTc- r'7/ / / i ilelhodofscmchimiidewiH S^S^fTchHJ^ OipihofiiB'Pipihofgiavcl in bottom of holf ifc ^_tnc^ Dale and hour of initial water Depth of initial water niling /Cs-----inches above hole bottom Mfiho«t used to maintain at least 12 inches of water depth in hole for at least 4 hours /1.a^---------------------------- X4aw2mit(n uittiAr (li«nih nhnve hnie hottum dunna Ul IIWIV IWI •»» iveM* »>W» ■ I --------------- ^ * , Maximum water depth above hole bottom during tc:>t / / y-} Time Time interval.. minuias Measurement, inches Drop in water level, inches L1.1SL f,. L L Percolation rate, minutes per inch Remarks ■‘Vi ■■ I //T/r /^;IL / f C-i, s >’ ■’ l^k I ? %/ /? 5^;, # I ///I I ) /f vp - g ys^ // I *, / ■-' /£■ ?1 f , ■■ ; • 3 m.ML Jy - y y ^^jninuies par inch. . ' ■»_________________: ViiiaMImm -?S :>' * w-. -mw ■a ?l W ..•• •'m "w;v:f •-f: ■ B>I8Lo|^« of Sot I Bertnp.s liocaclon or rro)«ct ^A/sV^_____________________________ ■„i-. b* Pat, /a-s/- a^9 ClMBifieatiMi fyscMi AA8H0____; USHB-SCS X * Wnlfltd____: other AoMf w4 (chock mo) t Itod ^Lf or Povor__; Fllfcht___. or Bucket other L BorInf nuokerBorioft imeher Depth,Depth,1^-'inin 9¥PSurface elevationSurface olovocion feetfeet i ',,; o ik ■'• ■- .- etdtH 404/^pLscK LosfiWM.\ —I — \ •■ 2 — 6t, €.l4^L0sn /iiULtp If •• •• M000^ €10f 3 —> 4 —mY U? 5 -5 — •.. • 5-v . . • 6 —6 —-V . ••. H¥>■ 7 — ■y ¥•8 —8 — ;; - 4.End borlnp at ^ feet* Standing!' water table: Present at _ _ _ _ feet of depth. End of borlnp at V_ _ feet. Standing water table: Breaent at_ _ _ _feet of depth. %_ _ _ _ _ hours after horlnn. Not present In borlnp hole hours after borlnt. Not present in borinp hole X V.'mm IMottled soil:Nettled soil: 0^8«*Fod ot 2» t foot of depth. Net present In borinp hole _ _ _ Dhnwfvolioon and conoents: Observed at ? feet of depth. Not present in borinp hole Observations and coonents: i- ' ZM'm !■ & I I: • . « u««tt»ll 9t fMjtec ^AiuCT B-27 B«riiits p^£)sa/ a fifiM/ / eiMBlfiMttmi SysMi AASm____,j USOA-SCS X : Unified Date .; other «w«Mr •••4 («h««k tiw)i aand ^ ov rwtr___; ntiht___, or Bucket other lorUig ttoAbevBt»Cti 1>opth,Borlnjt nuB^erimInSttfUCB BUYattoil Surface elevationfeetfeet 0 i —1 —^ .■il If ■i‘‘2 —2 — tut i4M#n r 1 S —B — %4 —4 -- lit':-5 —5 — -WM W 6 —6 ^■/ •■j Bm j ^ r ■' p,- ■- ■V *’ «L 4 7 —y • -i 8 — ■ ' v'i U:■7. .:J!?. End of boring at V feet. Standing water table:. Freaent at_ _ _ _foot of depth. End of boring at feete Standing water table: Present at_ _ _ _feet of depth, hours after boring hours after boring. Net present In boring hole X ■Not present In boring hole L Mettled soil: Iv^f Observed at . S> 2 feet of depth. " Not present in boring hole_ Mottled soil: Observed at feet of depth. .Ai::'-Not present in borlnn hole Observations and eoomantstObservations and cesMnts: