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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 A <br /> 31 Groundwater Elevation Data <br /> Groundwater elevations measured in site monitoring wells on November 5, <br /> 2002 (summarized in Table 1), ranged from minus (-) 27 46 feet to -28 24 <br /> feet MSL Groundwater levels in the wells decreased approximately 2 feet <br /> from the previous August 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 and the new sparging <br /> compressor, petroleum hydrocarbon concentrations in groundwater samples <br /> have significantly decreased As shown in Table 4, petroleum concentrations <br /> in groundwater samples collected this quarter from wells MW-1, SPA, SP-2, <br /> PZ-I and PZ-2 continue to decrease dramatically compared to previous <br /> quarters <br /> BTEX compounds were only detected in groundwater samples collected this <br /> quarter from wells SP-1, SP-2 and PZ-2,-located in the vicinity of the former <br /> gasoline USTs (see Figure 4) Benzene was only detected in samples from <br /> wells SP-1 and SP-2 at concentrations of 490 lig/1 and 12 pg/I, respectively <br /> This is the first quarter where benzene was not detected in samples from wells <br /> MW-1 and PZ-1 Toluene ranged from 5 8 pg/l in the sample from well SP-2 <br /> to 77 pg/l In the sample from PZ-2 /Ethylbenzene ranged from 10 pg/1 in the <br /> sample from SP-2 to 240 µg11 in the sample from SP-1�/Xylenes ranged from <br /> 37 pg/l in the sample from SP-2 to 1,500 dig/l in the sample from SP-1 e" <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 /> MW-1 2, SP-1, SP-2, and PZ-2 samples at 110 pg/l, 440 µg11, <br /> 9,400 pg/l, 4,300 pg/l, and 9,000 pg/l, respectively/Ihis is the first quarter <br /> where TPH-G has not been detected in samples from well PZ-1 <br /> 9 <br /> No%LnihLi-2002 Ground"aty Monitoring And Remedlatton Status Report <br /> I hL Carthgr,uns Baking Company <br /> 26.)1 South Airport Way-Stockton California <br /> Prcparad for IIII, H XRI II(RAINS ItkI,IN( CONIMNV YrLpamd by 1111111)SLUVILLS Corp <br /> It 51 NV1624WI 2U21,821C,11,wcL111nVSt11L1,1-A1102n1n1 dot DLLmhLf9 2002 <br />