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r <br /> Ms Maria Guensler <br /> Exxon Company, U S A <br /> May 3, 1996 <br /> Page 2 <br /> toluene, ethyibenzene, total xylenes (BTEX) and methyl tertiary butyl ether (MTBE) using EPA <br /> Method 8020, and total purgeable petroleum hydrocarbons (TPPH) as gasoline using EPA Method <br /> 8015 Modified Ground water analytical results are summarized in Table 2 A copy of the laboratory <br /> analytical report with chain of custody documentation is presented in Enclosure B <br /> Analytical results reported benzene above the laboratory detection Iunit in the ground water samples <br /> collected from MW-1 and MW-3 at concentrations of 2 0 nucrograms per liter (ug/L), and 20 ug/L, <br /> respectively A dissolved benzene concentration map based on analytical results for ground water <br /> samples collected during the fourth quarter 1996, site visit is included as Figure 4 TPPH as gasoline <br /> was reported in the ground water sample collected from MW-3 at a concentration of 55 pg/L The <br /> ground water samples collected from MW-1, MW-3 and MW-6 contained MTBE at reported <br /> concentrations of 150 pg/L, 29 pgIL and 22 gg/L, respectively Remaining ground water samples <br /> collected did not report any analyte at or above the laboratory's limits of detection <br /> Future Work <br /> The next quarterly monitoring event for this site is scheduled for January 1997 Delta and Exxon are <br /> currently negotiating with the property owners north of the site for placement of proposed ground water <br /> monitoring well (MW-9) A work plan is currently being prepared to address petroleum hydrocarbons <br /> present in the soil beneath the site <br /> Remarks/Sienatures <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 and <br /> are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this <br /> time and location Other than tins, no warranty is implied or intended <br /> Delta recommends that copies of this report be forwarded to <br /> Mr Michael J Inform 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 />