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and a nominal porosity of 0. 3, the pore velocity of ground water <br /> in the sand and gravel layers under the site could be <br /> V = Ki/n <br /> 1 . 3 x 10-5 m/sec = (225 feet/year) . <br /> r <br /> 2 . 1 .2 Chemical Analyses <br /> The concentrations of total petroleum hydrocarbons (TPH) in the <br /> water samplers taken by GTI at the site on 19 March 1987 ranged <br /> from 0 ,3 mg/L in MW3 to 2.4 mg/L in MW2; the corresponding valvies <br /> for benzene were 0.08 mg/l and 0.8 mg/L. In August, hydrocarbon <br /> levels were below the detection limit for benzene, toluene, and <br /> xylenes ( <0.0005 mg/L) and for tc}a1 fuel hydrocarbons ( < 1 mg/L) <br /> in all of the water supply wells in the vicinity of the site (EA <br /> 10987 ) . <br /> The data collected in these investigations were used ( EA 1987 ) in <br /> RESSQ, a computer program for modeling ground-water transport, to <br /> evaluate whether contaR, .nated ground water might reach water <br /> supply wells near the site. <br /> 2.2 SITE INVESTIGATION <br /> Based on the findings of the previous investigations (GTI 1987 ; <br /> EA 1987 ) , four additional monitoring wells were installed at the <br /> boundaries of the site to evaluate possible movement of hydro- <br /> carbons dissolved in ground-water. The boreholes (EA1 -EA4, <br /> Figure 3 ) were drilled on 9 and 10 Febru=,:y 1988. <br /> 2 .2 . 1 Well Drilling and Int: .allation <br /> The boreholes, drilled with a hollow-stem auger, were completed <br /> as monitoring wells with 0.020-inch-slot screen and blank casing <br /> oV A-inch Schedule 40 FVC. The depth of each well, the screened <br /> interval, and other details are presented in the well logs <br /> c23/72g2 4 <br />