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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 i <br /> 31 Groundwater Elevation Data <br /> Groundwater elevations measured in site monitoring wells on July 18 and 19, <br /> 2001 (summarized in Table 1), ranged from minus (-) 22 21 feet to —22 91 <br />' feet MSL Groundwater levels in the wells decreased approximately 15 feet <br /> from the previous April 2001 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 /> Petroleum hydrocarbon compounds were detected in groundwater samples <br />' collected from wells MW-1, MW-4, MW-12, SP-1, SP-2, PZ-1, and PZ-2 <br /> The highest BTEX concentrations appear to be centered in the vicinity of the <br /> former gasoline USTs near wells MW-1, SP-1, and PZ-1 (see Figure 4) There <br /> were no detectable petroleum hydrocarbon concentrations measured in <br /> samples from wells MW-9, MW-10, and MW-13 <br />' Detected benzene concentrations ranged from 11 µg/l, in the sample collected <br /> from well SP-2 to 3,700 pg/l in the sample from PZ-1 Toluene ranged from <br /> 19 µg/l in the sample from SP-2 to 3200 µg/l in the sample from PZ-1 <br />' Ethylbenzene ranged from 16 µg/l in the sample from SP-2 to 1,300 Iig/l in <br /> the sample from PZ-I Xylenes ranged from 3 pg/1, in the sample from MW-4 <br />' to 5,300 µg/l in the sample from PZ-1 <br /> Higher TPH-G concentrations are centered near the former gasoline USTs <br /> 1 (Figure 5) TPH-G concentrations were measured in the MW-1, MW-12, SP- <br /> 1, SP-2, PZ-1, and PZ-2 samples at concentrations of 20,000 µg/l, 1,300 µg/l, <br /> 23,300 µg/1, 6,700 pg/1, 23,000 µg/l and 16,000 µg/1, respectively <br />' 3.3 Oxygenates Analytical Results <br /> Yg Y <br />' DIPE was the only oxygenate compound measured in any groundwater <br /> sample DIPE was detected in samples collected from wells MW-1, MW-12 <br /> and SPA DIPE was not detected in samples collected from MW-4, MW-9, <br /> 9 <br /> July 2001 <br /> Groundwater Monitoring and <br /> Remedial Action Results <br /> The Earthgrams Company <br /> 2651 South Airport Way <br /> Stockton California <br />' Prepared for THE EARTIICRAINS COMPANY Prepared by Philip Services Corp <br /> HSENV1624001321121382EG\Swkton\Sto kton10701 mon do August 14 2001 <br />