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Ms Marla Guensler <br /> Exxon Company, U S A <br />• May 4, 1993 <br /> Page 2 <br /> i <br /> summarized in Table 2 Ground water samples collected from monitoring wells MW-2 and MW-5 <br /> did not contain detectable concentrations of BTEX or TPHg Ground water samples collected from <br /> monitoring wells MW-4 and MW-6 did not contain detectable concentrations of BTEX The <br /> concentration of benzene in monitoring well MW-3 has decreased from 1,700 to 360 nacrograms per <br /> liter (µg/1) since the previous sampling event in December 1992, the concentration of benzene in <br /> monitoring well MW-1 has increased from 6 9 to 15µg/l A dissolved benzene isoconcentration map <br /> based on analytical results for ground water samples collected on April 5, 1993, is included as <br /> 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 June 1993 Delta anticipates that <br /> two additional monitoring wells will be installed at the site in the second quarter of 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 />