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Third Quarter 1997 Ground Water Monitoring Report,Beacon#419 <br /> 2350 Waterloo Road Stockton Caldornia <br /> • Page 2 <br /> GROUND WATER SAMPLING AND ANALYSES <br /> Ground water samples were collected from six monitoring wells All samples were analyzed for <br /> concentrations of <br /> • TPH, as gasoline, by modified EPA Method 8015 <br /> • BTEX by EPA Method 602 <br /> • MTBE by EPA Method 602 <br /> Analytical results collected since July 1994 are summarized in Table 2 Figure 3 illustrates the <br /> inferred distribution of benzene in ground water based on the current data The laboratory report <br /> and chain-of-custody form for the current sampling event are contained in Attachment C Benzene <br /> was not present at detectable concentrations in ground water samples collected from monitoring <br /> wells MW-4, MW-5, and MW-6 Benzene concentrations decreased in the sample collected from <br /> monitoring well MW-1 and increased in the samples collected from monitoring wells MW-2 and <br /> MW-3 compared to prior sampling <br />• A copy of this quarterly monitoring report should be forwarded to <br /> Mr Michael Infurna <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> Mr Gordon Boggs <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> i <br />• <br /> EI Dorado Environmental, Inc <br />