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Ms Marla Guensler Exxon Company, U S A May 3, 1996 Page 2 r of benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons (TPH) { as gasoline using EPA Methods 602 and 8015 Modified, respectively Analytical test results are summarized in Table 2 A dissolved benzene concentration map based on analytical results for ground water samples collected on April 2, 1996, is included as Figure 4 A copy of the laboratory analytical report with chain of custody documentation is presented in Enclosure B Analytical results reported benzene above laboratory detection limits in the ground water samples collected fro MW-2, MW-3, and MW-4 with concentrations of 10 micrograms per liter (µgIL), 24 µg/L, and 1 9 µg/L, respectively TPH as gasoline was not detected above the laboratory's limits of detection in ground water samples submitted for chemical analysis Future Work The next quarterly monitoring event for this site is scheduled for JulyX1996 Delta and Exxon are currently negotiating with the property owners north of the site for placement of theprcWosed ground water monitoring well MW-9 The location of this proposed well is illustrated in Figure 2 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 Michael J Infurna Ms Beth Thayer Environmental Health Division California Regional Water Quality Control Public Health Services Board, Central Valley Region San Joaquin County 3443 Routier Road Post Office Box 2009 Sacramento, California 95827-3098 Stockton, California 95201