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16 <br /> 1 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 January 23, <br /> 2002 (summarized in Table 1), ranged from minus (-) 23 30 feet to—24 24 <br /> feet MSL Groundwater levels in the wells increased almost 2 feet from the <br /> previous October 2001 monitoring event As shown in Figure 3, the <br /> groundwater flow direction is easterly at a gradient of about 2 3 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 /> There were no detectable petroleum hydrocarbon concentrations measured in <br /> samples from wells MW-9, MW-10 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 0 96 pg/l, in the sample <br /> collected from well MW-4 to 3,800 µg/l in the sample from PZ-1 Toluene <br /> ranged from 2 2 µg/l in the sample from MW-4 to 2,800 4g/1 in the sample <br /> from PZ-1 Ethylbenzene ranged from 1 7 pg/l in the sample from MW-4 to <br /> 1,300 µg/l in the sample from PZ-1 Xylenes ranged from 10 µg/1 in the <br /> sample from MW-12 to 6,000 µg/1 in the sample from SP-1 Maximum BTEX <br /> concentrations are generally lower than those measured in October 2001 <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-4, <br /> MW-12, SPA, SP-2, PZ-1, and PZ-2 samples at 18,000 µg/l, 150 µg/1, 1,100 <br /> pg/l, 27,000 µg/l, 27,000 µg11, 24,000 µg11, and 15,000 pg/I, 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-1, MW-12, <br /> 9 <br /> January 2002 <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\121382@G\StocktonlStockton\0102mon dm February 15,2002 <br />