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x 28 November' 200 -
<br /> AGE-NC-Project No. 96:-.0.2.29. "-
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<br /> via an adj acent--boring advanced within-two feet of:each sounding boring CPT boring,logs are
<br /> presented in Appendix yA, a-'site plan.depicting bon locations is presented in Figure.2
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<br /> tF 2.1. - -CPT LITHOLOGIC SOUNDINGS ry-
<br /> Soil borings P-10'P-1-1,P 12;ryP 13 and P44 were.advanced vertically;to total depths of 100,feet bsg " Y r.l
<br /> r .
<br /> utilizing a 25"ton truck-mounted CP'T.drill rig equipped.with-2 inch diameter.hollow-stem rods.-A..
<br /> hydraulic-ram was utilized toradvance a cone penetrometer tip to total,,depth.of.each CPT boring.'--Soil .
<br /> parameters such as,-cone penetrometer..tip resistance, sleeve friction, friction:ratio,(mtiobetween
<br /> r._ sleeve friction and.tip resistance) and pore water,pressure.were continuously measured-as'the cone••. R-3 �
<br /> penetrometer Was.-.-advanced to depth: A continuous boring. log 'was :generated.'utilizing the
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<br /> .Ho .ento 7 r -
<br /> HI g e -Co. CPT computer program:,The Hogentogler Co:,computer program>utilized the CPT.ri w =°
<br /> Soil Behavior Classif cataon.,System:(Robertsorf,P.K.; Campanella,R.G,Gillespie,D."and Greig, J.,., ,
<br /> r- ..
<br /> .1986), to genErate a_general ,lithologyaype and display on a CPT boring log.(See.Appendix
<br />�.. Rinseate"generated-during drilling activities was:containerized in properly labeled DOT approved
<br /> 55-gallon drums; and stored on-site in an area lacking public access Atfsoil boringswere backfilled.
<br /> e,,by inserting hollow steel rods to total depth,of each boring arid:backfilling with i Portland cement -
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<br /> f _ y 2.2. STRAT_,IGRAPHY
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<br /> Based on the findings from CPT soil borings P-1.0, P 11, Pi 1.2; P 13.and P-14; cross'sections'C C'
<br /> ' and.D-D'..were constructedand depic
<br /> general eral lithology beneath,the`site (Figures 3.and 4).'Cross '
<br /> sections A=A'.and B B'were.presented in Preliminary Investigation &Evaluation.Report,'dated 15 =.
<br /> Jams 1997 Generali ave11 fine to coarse Bandl' ers were observed atde bths betweeri`30 ands F
<br /> *. Y,gr Y, Y e P
<br /> T 40 feet bsg,70_and 7-5 feet bsg'and 85 and:90.feet..bsg. Generally,fine graiiicd, silty clay-and clayey
<br /> _ silt layers were observed at depths between:surface grade and 5',feet bsg;between 50:feet and 60 feet
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<br /> bsg,between-75 feet and 80:feet bsg and 95-feet=and 100-feet bsg. Variable lithology-including silty,='F
<br /> fine sand,-sandy silt and clayey sift to siltyrclay.were observed at all:.other depths CPT:computer
<br /> generated bonng logs are inclWed`in Appendix A
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<br /> 2 3. HYDROGEOLOGICUN
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<br /> ~" Based on:cross'sections C-C' and-D-D-',.AGE 'informally identified'three:hydrologic flow-units -2 Y
<br /> r between surface grade and.100 feet'bsg'(First'Water-Zone, Second Water.Zorie and Third Water.;.. s--
<br /> Zone) as"having significant .intervals of, apparently,' courser: grained soil:separated by J °
<br /> .y `.sij ficant intervals of finer.- 'ained. less erm 1 __
<br /> gni gr p eab a soil. Generally,First Water Zone was identified x
<br /> _ dvanced- Environment nc '�`
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