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• 3 GROUNDWATER MONITORING RESULTS <br /> Groundwater elevation data, and analytical results are discussed in this section <br /> Laboratory analytical reports are contained in Appendix 1 <br /> 3.1 Groundwater Elevation Data <br /> Groundwater elevations measured in site monitoring wells on July 2, 2000 <br /> (summarized in Table 1), ranged from minus(-) 20 24 feet to—20 81 feet <br /> MSL Groundwater levels in the wells decreased approximately 1 5 feet from <br /> the previous March 2000 monitoring event As shown in Figure 3, the <br /> groundwater flow direction is easterly at a gradient of about 2 2 x 10-3 feet per <br /> foot, which is consistent with historic trends <br /> 3.2 BTEX and TPH-G Analytical Results <br /> BTEX compounds were detected in groundwater samples collected from all of <br />' the sampled monitoring wells The highest BTEX concentrations appear to be <br /> centered near the former gasoline USTs and the locations of wells MW-1 and <br /> SP-1 (see Figure 4) Trace BTEX concentrations were measured in samples <br /> collected from wells MW-4, MW-9, MW-10, and MW-13 <br /> Detected benzene concentrations ranged from 6 2 µg/l, in the sample collected <br /> from monitoring well MW-13, to 1,900 µg/1 in the sample from SP-1 Toluene <br /> ranged from 16 µg11, in the sample from MW-9, to 1,400 µg/1 in the sample <br /> from MW-1 Ethylbenzene ranged from 3 9 µg/1, in the sample from MW-9, <br /> 1 to 930 µg/1 in the sample from MW-1 Xylenes ranged from 22 gg/l, in the <br /> sample from MW-9, to 3600 gg/l in the sample from SP-1 <br /> Higher TPH-G concentrations are centered near the former gasoline USTs <br /> (Figure 5) TPH-G concentrations were measured in the SP-1 and MW-1 <br /> samples at concentrations of 17,000 µg/1 and 20,000 µg/1, respectively <br /> 3.3 Oxygenates Analytical Results <br />' DIPE was detected in samples collected from wells MW-1, MW-12, SP-1, and <br /> PZ-I DIPE was not detected in samples collected from MW-4, MW-9, MW- <br /> 10, MW-13, SP-2, and PZ-2 DIPE concentrations ranged from 16 pg/1 in the <br /> sample from MW-12 to 56 µg/1 in the sample from SP-1 The highest DIPE <br /> concentrations appear to be centered near MW-1 and SP-1 (see Figure 6) <br /> i 8 <br /> July 2000 <br /> Groundwater Monitoring Report <br /> The Earthgrams Company <br /> 2651 South Airport Way <br /> Stockton,California <br /> Prepared for THE EARTHGRAINS COMPANY Prepared by Philip Services Corp <br /> H 1ENV\62400132\121382EG\Stockton\Stacktan10700mon doc August 14,2000 <br />