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Fust Quarter 1997 Groundwater Monrtonng Report <br /> 2350 Waterloo Road,Stockton,California <br /> GROUND-WATER SAMPLING AND ANALYSES <br /> Ground-water samples were collected from all six wells All samples were analyzed for concentrations <br /> of <br /> • TPH as gasoline, modified EPA Method 8015, <br /> • BTEX and MTBE by EPA Method 602 <br /> Analytical results from July 1994 to-date are summarized in Table 2 The laboratory report and chain- <br /> of-custody form for the current sampling event are attached Benzene was not detected in wells MW-2, <br /> MW-4, MW-5, and MW-6 Benzene concentraLions increased in MW=1 and decreased in MW-3 as <br /> compared to the previous sampling event MTBE was not detected in any of the samples collected in <br /> MW-1 through MW-6 A benzene isoconcentration map is illustrated in Figure 3 <br /> A copy of this quarterly monitonng report should be forwarded to the following parties <br /> San Joaquin County Environmental Health Department <br /> Attention Mike Infurna <br />• 445 North San Joaquin Street <br /> Stockton, California 95201 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Attention Gordon Boggs <br /> 3440 Routier Road <br /> Sacramento, California 95827 <br />• <br /> 2 <br />