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First Quarter 1997 Ground Water Monitotlng Report,Beacon 9474 <br /> 3440 East Main Avenue.Stockton.Calitomia <br /> Page 2 <br /> GROUND WATER SAMPLING AND ANALYSES <br /> Ground water samples were collected from five 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 December 1993 are summarized in Table 2. Figure 3 illustrates <br /> the 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-1,MW-3,MW-4, and MW-5. Benzene concentrations decreased in the sample collected <br /> from monitoring well MW-2 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 /> EI Dorado Environmental, Inc. <br />