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3 GROUNDWATER MONITORING RESULTS <br /> U TS <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 November 8, 1999 <br /> (summarized in Table 1), ranged from minus(-) 23 19 feet to--23 76 feet MSL <br /> Groundwater levels in the wells decreased approximately 1 5 feet from the <br /> ' previous August 1999 monitoring event As shown in Figure 3, the groundwater <br /> flow direction is east-northeast at a gradient of about 2 2 x 10"3 feet per foot, <br /> 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 wells <br /> MW-1, MW-12, SP-1, SP-2, PZ-1, and PZ-2 The highest BTEX concentrations <br /> ' appear to be centered near the former gasoline USTs and the locations of wells <br /> MW-1 and SP-1 (see Figure 4) BTEX compounds were not detected in samples <br /> collected from wells MW-4, MW-9, MW-10, and MW-13, in contrast to the <br /> detection of trace levels in these wells measured in the previous August 1999 <br /> monitoring event <br /> Detected benzene concentrations ranged from 14 gg/l, in the sample collected <br /> from monitoring well MW-12, to 2,800 gg/l in the sample from SP-1 Toluene <br /> ranged from 4 4 gg/l, in the sample from MW-12, to 1,300 gg/l in the sample <br /> ' from MW-1 Ethylbenzene ranged from 2 2 µg/1, in the sample from MW-12, to <br /> 840 gg/l in the sample from MW-1 Xylenes ranged from 1 2µg11, in the sample <br /> from MW-12, to 4,100 gg/l in the sample from SP-1 These BTEX concentrations <br /> ' are slightly lower than those measured in the August 1999 monitoring event <br /> Higher TPH-G concentrations also appeared to be centered in the vicinity of the <br /> 1 former gasoline USTs (Figure 5) TPH-G concentrations ranged from 1,300 µg/1, <br /> in the sample from well PZ-2, to 20,000 gg/l in the sample from MW-1 <br /> 3.3 Oxygenates Analytical Results <br /> 1 DIPE was detected in samples collected from wells MW-1, MW-4, MW-12, SP-1, <br /> and PZ-1 D1PE was not detected in samples collected from MW-9, MW-10, <br /> 7 <br /> November 1999 <br /> Groundwater Monitoring Report <br /> The Earthgrams Company <br /> 2651 South Airport Way <br /> Stockton,California <br /> Prepared for THE EARTHGPAINS COMPANY Prepared by Philip Services Corp <br /> January t7,2000 <br />