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Soil analytical results collected during previous assessments are summarized in Table 1 and <br /> analytical results collected during this assessment are summarized in Table 2 <br /> Benzene concentrations detected in soil at 20 to 40 feet bgs during this assessment and <br /> previous assessments are plotted and contoured on the Benzene in soil isoconcentration map <br /> included as Figure 6 and MTBE concentrations detected in sod at 20 to 40 feet bgs during <br /> this assessment and previous assessments are plotted and contoured on the MTBE in soil <br /> isoconcentration map included as Figure 7 <br /> The highest TPH and BTEX concentrations were detected in the area of the former USTs <br /> at depths ranging from 20 to 40 feet bgs <br /> Laboratory analysis of groundwater samples collected from monitoring wells MW-10 and <br /> MW-i 1 on August 14, 1996 detected TPH at concentrations of 12,000 ug/1 and 370,000 <br /> ug/l, respectively and benzene at concentrations of 2,800 ug/1 and 33,000 ug/l, respectively. <br /> MTBE was not detected at concentrations exceeding laboratory detection limits of 400 ug/1 <br /> and 20,000 ug/l, respectively <br /> Laboratory analysis of the groundwater sample collected from monitoring well MW-11 on <br /> November 26, 1996 detected TPH and benzene at concentrations of 16,000 ug/1 and 5,200 <br /> ug/l, respectively. TPH and BTEX were not detected at concentrations exceeding laboratory <br /> limits in the sample collected from monitoring well MW-10 MTBE was detected at <br /> concentrations of 46 ug/1 and 880 ug/l, respectively <br /> Benzene concentrations detected in groundwater samples collected on August 14, 1996 are <br /> plotted and contoured on the benzene in groundwater isoconcentration map included as <br /> Figure 8 and MTBE concentrations detected in groundwater samples collected on November <br /> 26, 1996 are plotted and contoured on the MTBE in groundwater isoconcentration map <br /> included as Figure 9 <br /> 7 <br />