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The groundwater samples from MW-1 and MW-BT collected on August <br /> 24, 1999 and analyzed for TPHD contained Non Detectable <br /> concentrations of Diesel. <br /> 6. HISTORICAL GROUNDWATER LEVELS <br /> The historical groundwater levels have varied from approximately <br /> 5 feet to 7 feet below surface. These levels at the approximate <br /> distances above sea level are identified in Table 3 . <br /> A. Gradient Summar <br /> The calculated groundwater gradient data was N220W or 3380 at <br /> 0 . 004 ft/ft in November 1997 , N260W or 3340 at 0 . 004 ft/ft in <br /> March 1998, N251E or 0250 at 0 . 05 ft/ft in July 1998, N80W or <br /> 3520 at 0 . 004 ft/ft in October 1998 , N11°W or 3490 at 0 . 003 ft/ft <br /> in March 1999 . <br /> The calculated groundwater gradient is generally northerly at <br /> approximately 0 . 004 ft/ft. <br /> 7 . CONTAMINATION DISTRIBUTION <br /> A. SOIL <br /> 1 . VERTICAL DISTRIBUTION <br /> Based on the work reported by SMITH and JPCA, the first five feet <br /> of soil has no detectable hydrocarbon contamination. SMITH <br /> reported the information at Page 2 of their Phase II Report. The <br /> reported hydrocarbon contamination in the soil was detected <br /> between approximately five and twenty feet below surface level . <br /> 2 . LATERAL DISTRIBUTION <br /> The area outlined in Figure 5 for soil contamination is <br /> approximately 7, 500 ft2. The SMITH report identified no <br /> hydrocarbon contamination beyond fifty feet of the UST on Figure <br /> 3 of their Phase II report. <br /> The calculated volume of contaminated soil is approximately <br /> 8 <br />