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Mr Dann L Rouse Exxon Company,U S A April 19, 1999 Page 2 Ground Water Samphng Analytical Results Ground water samples collected from monitoring wells MW-1 through MW-8 and vapor extraction wells VEW-1 and VEW-3 on March 5, 1998, were submitted to Sequoia Analytical for analysis of benzene, toluene, ethylbenzene, and total xylenes (BTEX) and methyl tertiary butyl ether (MTBE) by EPA Method 8020, and total purgeable petroleum hydrocarbons (TPPH) as gasoline by EPA Method 8015 Modified Concentrations of BTEX and TPPH as gasoline were less than the laboratory reporting limits in the samples collected from monitoring wells MW-1 through MW-8, and VEW-3 Concentrations of MTBE by EPA Method 8020 were reported in monitoring wells MW-I, MW-3 through MW-6 and MW-8 ranging from 7 2 µg/]L (MW-1) to 66 µg/L (MW-3) Toluene and TPPH as gasoline were reported in the ground water sample collected from VEW-I at concentrations of 0 78 pg/L and 87 pg/l, respectively Figure 4 presents dissolved concentrations of benzene, TPPH as gasoline, and MTBE in ground water for the March 5, 1999, sampling event Cumulative analytical results are summarized in Table 1, and a copy of the laboratory analytical report for the March 5, 1999, sampling event is presented in Enclosure B Future Work . Second quarter 1999 ground water sampling is scheduled for June 1999 Due to a rise in the water table over the past two years, the monitoring well screens are submerged A monitoring well installation work plan will be prepared and submitted during second quarter 1999 Based on ground water measurements collected since monitoring activities began at the site in August 1991, flow direction has been historically towards the northeast with some seasonal variances towards the east The Southland property located west of the former Exxon service station has recently removed and replaced its underground storage tanks We understand that as a result of soil conditions encountered within the tank basm, Southland has initiated a soil and ground water contamination investigation Remarks/St natures 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