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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 B <br /> 3.1 Groundwater Elevation Data <br /> Groundwater elevations measured in site monztonng wells on August 1, 2002 <br /> (summarized in Table 1), ranged from minus (-) 25 27 feet to—26 05 feet <br /> MSL Groundwater levels in the wells decreased approximately 2 feet from <br /> the previous April 2002 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 /> linear foot, which is consistent with historic trends <br /> 3.2 BTEX and TPH-G Analytical Results <br /> Since the installation of new sparging well SP-A, petroleum hydrocarbon <br /> concentrations in groundwater samples have significantly decreased by a <br /> factor of about 10 As shown 1n Table 4, petroleum concentrations 1n the <br /> groundwater sample collected this quarter well from well MW-1 continue to <br /> decrease compared to the previous quarter Petroleum concentrations from the <br /> other more highly impacted wells (SP-1 and PZ-1) are relatively consistent <br /> compared to the previous quarter It is PSC's opinion that decreases were not <br />' observed in samples from SP-1 and PZ-1 because of limited sparging capacity <br /> from a failing sparge compressor PSC will install a new sparge compressor in <br /> September 2002 1-I, a 14V <br /> YJ <br /> �_ mt�1t <br /> BTEX and TPH-G compoun were detected in groundwater samples <br /> collected from wells MW-1, P-1, SP-2, PZ-1, and PZ-2 There were no <br />' detectable petroleum hydrocarbon concentrations measured in samples from <br /> wells MW-4, MW-9, MW-10, M �1 and MW-13 <br /> 1 The highest BTEX concentrations still appear to be centered in the vicinity of <br /> the former gasoline USTs near wells SP-1, SP-2 and PZ-1 (see Figure 4) <br /> Detected benzene concentrations ranged from 2 9 µg/l in the sample collected <br /> from well MW-I to 670 µg/l in the sample from SP-1 Toluene ranged from <br /> 3 6 µg/l in the sample from MW-I to 260 µg/l in the sample from PZ-2 <br /> Ethylbenzene ranged from 1 9 gg/1 in the sample from MW-I to <br /> 310 µg/l in the sample from PZ-2 Xylenes ranged from 16 µg/1 in the sample <br /> from MW-1 to 2,000 [tg/1 1n the sample from SP-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, <br /> 9 <br /> August 2042 Groundwater Monitoring And Remediation Status Report <br /> The Earthgrams Baking Company <br /> 2651 South Airport Way Stockton,California <br /> Prepared for THE EARTIIGRAINs BAKING COMPANY Prepared by Philip Services Corp <br /> H 1ENV%62400132%121382FOLSiockmn\Stocklon10802mon doc September 2,2002 <br />