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Ms Marla D Guensler Exxon Company U S A W11 August 4, 1998 Page 2 Ground Water Sampliniz Analytical Results Ground water samples collected from monitoring wells MW-1 through MW-8 on June 30, 1998, were submitted to Sequoia Analytical for analysis of benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method 8020, total purgeable petroleum hydrocarbons (TPPH) as gasoline by EPA Method 8015 Modified, and oxygenate compounds which consisted of ethanol, tert-butanol, methyl tertiary butyl ether, diisopropyl ether, ethyl tertiary butyl ether, and tert-amyl methyl ether using EPA Method 8260 Concentrations of BTEX and TPPH as gasoline were less than the laboratory reporting linuts in the samples collected Concentrations of MTBE by EPA Method 8260 were reported in monitoring ,�Nells MW-1 through MW-6 and MW-8 ranging from 3 5 µg/L (MW-4) to 59 µg/L (MW-3) Cumulative analytical results are summarized in Table 1, and a copy of the laboratory analytical report for the June 30 1998, sampling event is presented in Enclosure B Schedule Third quarter 1998 ground Nater sampling is scheduled for September 1998 Remarks/Siinatures The, interprc tations contained in this report represent our professional opinions, and are based in part on information supplied by the che.nt Thtsc opinions arc based on currently available information and are arrived at in accordance i4rth currently accepted hvdrogeologic and engineering practices at this timt, and location Other than this, no vNarranty is implied or intended Delta recommends that a copy of this report be forwarded to i Mr Mike Infurna Ms Elizabeth Thayer San Joaquin County Environmental Health California Regional Water Quality Control Board, Division, Public Health Services Central Valley Region Post Office Box 2009 3442 Routier Road Stockton, California 95201 Sacramento, California 95827-3098