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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 October 23, <br /> 2001 (summarized in Table 1), ranged from minus (-) 25 11 feet to—25 79 <br /> feet MSL Groundwater levels in the wells decreased almost 3 feet from the <br /> previous July 2001 monitoring event As shown in Figure 3, the groundwater <br /> flow direction is easterly at a gradient of about 2 1 x 10"3 feet per foot, which <br /> iis 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-9, MW-10, MW-12, SP-1, SP-2, PZ-1, and <br /> PZ-2 There were no detectable petroleum hydrocarbon concentrations <br /> measured in samples from wells MW-4 and MW-13 <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) <br />' Detected benzene concentrations ranged from 17 µg/l, in the sample collected <br /> from well MW-12 to 5,100 gg/l in the sample from PZ-1 Toluene ranged <br /> from 11 µg/1 in the sample from MW-10 and SP-2 to 4,900 µg/1 in the sample <br />' from PZ-1 Ethylbenzene ranged from 12 µg/1 in the sample from MW-9 to <br /> 1,700 µg/1 in the sample from PZ-1 Xylenes ranged from 7 4 gg/l in the <br /> sample from MW-12 to 7,100 µg/1 in the sample from PZ-1 <br /> Higher TPH-G concentrations are similarly centered near the former gasoline <br /> USTs (Figure 5) TPH-G concentrations were measured in the MW-1, MW-9, <br /> 1 MW-10, MW-12, SP-1, SP-2, PZ-1, and PZ-2 samples at concentrations of <br /> 11,000 µg11, 93 µg/1, 120 µg/1, 1,100 µg/l, 26,000 µg/1, 5,600 µg/l, 33,000 <br />' µg/l, and 14,000 µg/l, respectively <br /> 3.3 Oxygenates Analytical Results <br /> DIPE was the only oxygenate compound measured in any groundwater <br /> sample DIPE was detected in samples collected from wells MW-12, SP-1 and <br /> 9 <br /> October 2001 <br /> Groundwater Monitoring Report <br /> THE EARTHGRAINS BAKING COMPANY <br /> 2651 South Airport Way <br /> Stockton California <br /> Prepared for THE EARTHGRAINs BAKING COMPANY Prepared by Philip Services Corp <br />' H\ENV\62400132%12I382E6\Stockton\Swckton11001mon doc November 16,2001 <br />