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i <br /> CLEARWATER <br /> G R O U P, I N C <br /> ' analytical report is presented with the chain of custody in Appendix D. <br /> 3.3 Analytical Results of Soil Samples from CPT Boxing <br /> All soil samples collected between 42.5 feet and 80.5 feet bgs in CPTB-7 were analyzed <br /> for TPHg and BTEX; the sample collected at 75 5 feet bgs (deeper sand B) was also <br /> analyzed for TPHd, MTBE, and VOCs <br /> TPHg concentrations were 13 ppm or less in samples collected at 42 5 and 45.5 feet <br /> bgs, benzene concentrations were 0 01 ppm or less The sample collected at 50 5 feet <br /> ' bgs (in salty clay) contained no detectable concentrations of TPHg or BTEX The soil <br /> sample collected at 55 5 feet bgs (in what appears to be the same silty clay unit) <br /> contained benzene, ethylbenzene, and xylene in concentrations ranging from 0 006 <br /> ' to 0 01 ppm, only slightly above the detection limit of 0 005 ppm for those <br /> compounds <br /> One soil sample was collected from the poorly-graded sand (deeper sand A) <br /> encountered between 58 and 63 feet bgs, and two samples were collected from the <br /> underlying clay at depths of 65 5 and 70 5 feet bgs Benzene was detected at a <br /> concentration of 0 0011 ppm in the sample from deeper sand A, and benzene <br /> concentrations were 0 9 d 0 29 in the sam les collected at 65 5 and 70 5 feet <br /> bgs, respectively. Other constituents we're either non etec a e or present in <br /> ' concentrations,equal to the laboratory detection limits. <br /> A soil sample from deeper sand B, collected at 75 5 feet bgs, contained 0 4 ppm TPHg <br /> and 0 19 ppm benzene No detectable concentrations of TPHd, MTBE, or VOCs'other <br /> than BTEX were detected in that soil sample The sample collected at 80 5 feet bgs (in <br /> the underlying silty sand) contained 0 3 ppm TPH, 0 009 ppm benzene, and 0 01 ppm <br /> ethylbenzene and xylenes. I ' <br /> ' 3.4 Groundwater Gauging <br /> I <br /> 'On September 27, 1995,,depth to groundwater ranged from 23.05 to 24 29 feet below <br />� I I I I t I'I Iii E � � <br /> VAI I E top 1 of caising in the ,'sJ monitormg ,wells Groundwater elevat16ris ranged from <br /> `I ' 73'8$ feet in MW-3 to 72 60 ,feet in,MM'6' 'indicating 'that the 'groundwater, f16" <br /> ' ,I I, ,I <br /> 'direction is northwesterly.' <br /> it <br /> II�I The groundwaterkI � ` llq 11 i ' <br /> graientwas4pproxima1tely 1 '% (0 017 eet/f6o0across III i <br /> most of!, <br /> I p I,l�D1oJF PAR/3Q/PILOT <br /> d fff ilR I <br />