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ff Ms. Maria Guensler Exxon Company, U.S.A. May 4, 1993 Page 2 Analytical test results are summarized in Table 2. Ground water samples collected from monitoring wells MW-3 and MW-4 did not contain detectable concentrations of petroleum hydrocarbons. Concentrations of benzene in ground water samples collected from monitoring wells MW-5 and MW-6 have increased since the previous sampling event in November 1992. A dissolved benzene concentration map based on analytical results for ground water samples collected on April 5, 1993, is included as Figure 4. Copies of the laboratory analytical reports are presented in Enclosure B. Future Work The next quarterly monitoring event for this site is scheduled for June 1993. Delta anticipates that an investigation of soil conditions at the site will be conducted in the second quarter of 1993, as described in our work plan dated March 30, 1993. Remarks/Signatures The interpretations contained in this report represent our professional opinions, and are based in part, on information supplied by the client. These opinions are based on currently available information and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and location. Other than this, no warranty is implied or intended. Delta recommends that copies of this report be forwarded to: Mr. Mike Infurna Ms. Elizabeth Thayer Environmental Management Division California Regional Water Quality Control Board, Public Health Services Central Valley Region San Joaquin County 3443 Routier Road Post office Box 2009 Sacramento, California 95827-3098 Stockton, California 95201 Sincerely, DELTA ENVIRONMENTAL CONSULTANTS, INC. Richard E. Chandler Hydrogeologist No.5 07 r James R. Brownell, R.G. 9� ��- California Registered Geologist No. 5078 Fp ALIV-0 REC (LRP ISM)