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r <br /> Ms. Maria Guensler <br /> Exxon Company, U.S.A. <br /> November 10, 1993 <br /> Page 2 <br /> gasoline. Analytical test results are summarized in Table 2. Ground water samples collected from <br /> monitoring wells MW-3, MW-4, and MW-6 did not contain detectable concentrations of petroleum <br /> hydrocarbons. Concentrations of benzene in the ground water sample collected from monitoring well <br /> MW-5 has increased since the previous sampling event in April 1993. A dissolved benzene <br /> concentration map based on analytical results for ground water samples collected on <br /> September 7, 1993, is included as Figure 4. Copies of the laboratory analytical reports are presented <br /> in Enclosure C. <br /> Future Work <br /> The next quarterly monitoring event for this site is scheduled for December 1993. <br /> Remarks/Signatures <br /> The interpretations contained in this report represent our professional opinions, and are based in part, <br /> on information supplied by the client. These opinions are based on currently available information <br /> and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at <br /> this time and location. Other than this, no warranty is implied or intended. <br /> Delta recommends that copies of this report be forwarded to: <br /> Mr. Mike Infurna Ms. Elizabeth Thayer <br /> Environmental Management Division California Regional Water Quality Control Board, <br /> Public Health Services Central Valley Region <br /> San Joaquin County 3443 Routier Road <br /> Post office Box 2009 Sacramento, California 95827-3098 <br /> Stockton, California 95201 <br /> Sincerely, <br /> DELTA ENVIRONMENT NSULTANTS, INC. <br /> James R. Brownell, R.G. �,tr�RED GCO� <br /> California Registered Geologist No. 5078 4�N P� gRa�y O� <br /> DC (LRP140.SJH) r <br /> Enclosures � No. 5078 <br /> 'E"(0 lift <br /> CA�tF G���� <br />• <br />