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SB-02. In boring SB-03, water was encountered in a brownish-gray clayey sand of low <br /> plasticity. As previously mentioned,measured water levels are presented in Table 1. <br /> Figure 6 is a groundwater elevation map based on measured water Ievels of 25 March <br /> 1991. The levels were converted to elevations using top-of-casing survey information. <br /> All groundwater elevations on this date were between 12.4 and 12.7 feet below mean sea <br /> level. The snap was constructed by triangulation (three-point problem method) which <br /> assumes the water table to be a planar surface. The wells are situated with sufficient <br /> rtdistances between one another to give a reliable gradient measurement and flow direction <br /> estimation. <br /> The groundwater P approximately { <br /> gr gradient based on this ma is a mximatel 0.002 0.3 feet of <br /> groundwater elevation difference over a length of 13� feet). The direction of <br /> groundwater flow at the site is assumed to be perpendicular toe equal elevation contour <br /> lines and in a direction from higher to lower <br /> g groundwater elevation. The direction of <br /> flow is therefore estimated to be to the northeast with a bearing of N 40'E. <br /> ANALYTICAL RESULTS <br /> Soil Analyses <br /> A-total-of three, (3):soil.samples, ono:from each well, were analyzed for BTEX by <br /> EPA Method 8020 and TPH by EPA Method 418.1. .Benzene and thluene were not <br /> detected above analyrical-detection limits-in any of.the soil samples. Ethyl benzene was <br /> detected in the -2) sample at a concentration of c b) and total <br /> , . x,, l�ee were detected at a concentration of c in the same sample. Ethyl <br /> benzene and total xylenes were not detected above analytical detection limits in samples <br /> from SB-01 (MW-1) and SB-03 (MW-3). TPH was deteete&ava concentration of 1500 <br /> mg/kg (ppm)in the SB-02 (MW-2) soil sample,and 12 mg/kg (ppm) in the SB-01 (MW- <br /> 1) sample. TPH was not detected above analytical detection limits in the SE-03 (MW-3) <br /> ! soil sample. 'fable 2 summarizes these soil analytical results; laboratory data sheets are <br /> provided in Appendix E. <br /> Groundwater Analyses <br /> .,. Three (3) groundwater samples, one from each well, were analyzed for BTEX by EPA <br /> t Method 602, and three (3) groundwater samples. one from each well, were analyzed for <br /> 1 <br /> 4-2 <br /> 173-0715 4124)91 <br />