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Ms Marla Guensler <br /> Exxon Company, U S A <br /> October 22, 1993 <br /> Page 2 <br /> did not contain detectable concentrations of benzene Ground water samples collected from <br /> monitoring wells MW-2 and MW-4, which previously did not contain detectable concentrations of <br /> benzene, contained benzene concentrations of 0 6 parts per billion (ppb) and 0 7 ppb, respectively <br /> Analytical results indicate that the benzene concentrations decreased since the last sampling event in <br /> MW-I (15 to 2 5 ppb) and MW-3 (360 to 1 0 ppb). The concentration of benzene remained below <br /> the laboratory detection limit in monitoring well MW-5 A dissolved benzene isoconcentration map <br /> based on analytical results for ground water samples collected on September 23, 1993, is included <br /> as Figure 4 Copies of the laboratory analytical reports are presented in Enclosure B <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 Michael J Infurna Ms Beth Thayer <br /> Environmental Health Division California Regional Water Quality Control <br /> Public Health Services Board, Central Valley Region <br /> San Joaquin County 3443 Routier Road <br /> Post Office Box 2009 Sacramento, California 95827-3098 <br /> Stockton, California 95201 <br />