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Coca-Cola Erterprises- West USTEC job No.90054.03 J F Small concentrations of aromatic hydrocarbons (BTEX) were observed in all groundwater g ., monitoring wells. 'Benzene was present in all six wells in concentrations ranging from 0.39 ppb;,' in MW-5 to 25 ppb in MW-T: Toluene is present only in MW-1 at a concentration of 1.1 ppb. The present plume configuration for TPH gasoline and benzene is shown on Figure 4. The, ?' analytical test results indicated a lead concentration of 15 ppb in groundwater monitoring well MW-4a i In a plot of historical TPH gasoline concentrations compared to historical groundwater elevations 3 - for MW-1,an inverse relationship is suggested (Figure 5). TPH as gasoline levels peak at times ! -+ of lowest groundwater elevations suggesting that decreases in concentration are the result of f ..,� water elevation increases. i ! 5.0 SUMMARY AND CONCLUSIONS i I Six existing groundwater monitoring wells were measured and sampled in May 1991 by USTEC personnel. Groundwater measurement results indicates that the groundwater flow is generally ( to the northeast which is consistent with previous monitoring results. The decrease in TPH as i gasoline in all six wells may be due to changes in the groundwater elevations. s Groundwater contamination exists at this site at concentrations above the State of California recommended action limits for benzene (0.7 ppb). Gasoline TPH concentrations were present ' in groundwater monitoring wells MW-1 and MW-2. Benzene was present in all monitoimg wells at the site. Concentrations of benzene were above the State of California action level for t benzene (0.7 ppb) in groundwater monitoring wells MW-1 through MW-4. 'Concentrations of�l TPH.asdiesel were found in one well compared with none in the previous quarterly sampling. Lead was reported only in monitoring well MW-4. 5 y