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' Site Background Information Five Star Marina
<br /> Page 4 of 8
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<br /> hydraulic line on the Geoprobe unit's hammer Advancement of the remaining soil probe
<br /> borings, B4 and 135, as well as the continued advancement of boring B3 to total depth, was
<br /> delayed until 06 and 07 February 2006 pending repairs to the Geoprobe unit Soil samples were
<br /> collected at 5-foot intervals from each boring, a grab ground water sample was collected from
<br /> the first-encountered ground water in each soil boring, and an additional grab ground water
<br /> sample was collected at approximately 40 feet bsg from boring BI and at 47 feet bsg from boring
<br /> B5 During soil boring advancement, ground water was encountered at approximately 10 feet bsg
<br /> ' and stabilized at approximately 7 feet bsg in each soil boring
<br /> • TPH-g was detected in the soli sample collected from boring MWS at 20 feet bsg (MW8-
<br /> ' 20) and from boring 131 at 15 feet and 30 feet bsg (B 1-15 and B 1-30, respectively) at
<br /> concentrations of 4 2 mg/kg, 80 mg/kg, and 3 4 mg/kg, respectively BTEX constituents
<br /> ' were detected in borings MW8 and B l at the following maximum concentrations
<br /> 0 017 mg/kg benzene (B1-15), 0 094 mg/kg toluene (MW8-20), 3 4 mg/kg ethylbenzene
<br /> (B1-15), and 2 754 mg/kg xylenes (B1-15)
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<br /> STRATIGRAPHY
<br /> lipIn general, brown, gray-brown, and oran e-hrnwn silty ty clay and clayey silt tvcre Cr1Li)u11lc.rc,d
<br /> from surface grade to between approximately 14 feet and 17 feet bsg, with thinner, discontinuous
<br /> ' lenses of Sandy material encountered at 10 feet bsg, charactenstically, the clayey material had
<br /> low to moderate plasticity and consistency From 14 feet to depths as great as 23 felt bsg, silty
<br /> sand, sand, and gravelly sand were identified, with grain si7c generally increasing with depth,
<br /> ' this layer was typiLally underlain by an approximately 2-ioot to 3-foot thick layer of fine-grained
<br /> sandy silt Silty clay and clay were encountered beneath the Silty sand or sandy layers to depths
<br /> between 23 feet and 27 feet bsg on the west end of the property, and to approximately 28 tcet
<br /> bsg on the eastern end Below, a layer of stiff, blue-gray clay with moderate to high plasticity
<br /> and Lonsistcncy was identified to depths as great as 30 feet bsg on the, west end of the site, this
<br /> ' layer was not encountered on the. cast end of the property Silty Sand was generally encountered
<br /> throughout the, 51tL at dLpths betwLLn 28 feet and 32 feet bsg, under lain by intm,als of stiff,
<br /> blue-gray clay, Silty clay, clayey silt, and sandy tint to the total depths of the borings
<br /> 1IYf)ROU-Ut 0(11( M ODI-I
<br /> ' f3ascd on soil boring,, Vl\k / illi-ougll MW) and 131 through R3 Lind Lompanson with soil
<br /> description) from borings prLwously advanccd at 111L site., AGI dc.',ciciped a preliminary
<br /> ,,ub,,uifdLL rnodLl oftl,L sitz seriI stratiglaphy Lompiiscd of nine. itlfcirrnal /ones avadosc
<br /> (i1l,,,1tL1rated) icirlc and C1t,1jI 11Y0rogcnlci IC Units (lit s)' IE 'I Lcilo�ic I1111iS may bL dCF0Ld s
<br /> disttricilv{, vLrt Lc,i IMCIWLls Of ,,elil 11'°911 SI<<ntll( �!rit tatLl��� \I�ntti 'J"d ti111111ai -y{{liilO 'L
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