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Proposal for of Site Cleanup Confirmation May 5, 1992 Southland, 7-El even No 20680, 9110 Thornton Road, Stockton, CA 4 IThe results of the confirmation sampling round conducted on March 30, 1992, reported below detection limits for all compounds in all wells except MW-1, which had detectable levels as follows IAnalytical Results for MW-1 March 30, 1992 Compound Concentration (ppb) Cleanup Objective (ppb) I Benzene 0 5 1 0 Toluene 6 100 Xylene (total) 0 9 1,750 TPH-as-gasoline 19 Not Applicable I The results of this confirmation sampling round suggests that there was either a field sampling or laboratory error which resulted in false positive analytical results 2 2 2 Nearby Domestic Supply Wells Seven domestic supply wells in the vicinity of the site have been routinely sampled on a monthly basis since December 1988 As presented in the March 1991 report, drinking water standards for 8TEX compounds were not exceeded between December 1988 and October 1990 Since October I1990, the concentration of BTEX compounds have remained below detection limits in these wells Eth-the exception of the samples collected from the Ivy Motel welly Hydrocarbon compounds were rdetected in the Ivy Motel well on two occasions Drinking water standards were not exceeded on] ■ either occasion 1The detection of petroleum compounds in the Ivy Motel well is not believed to be " �asoctated with the Southland site because (1) the Ivy Motel is located up/cross gradient of thel I [Southland sqe,-and (2) sampling results from all other monitoring and domestic wells reported all compounds below detection limits I 2 3 Soil Remediation Results Overview As presented in the March 1991 report, the initial indications that the on-site source area soils had been remediated included ■ Reductions in petroleum concentrations in the soil vent system off-gas, I ■ Reductions in the groundwater hydrocarbon concentrations, and I 'GROUNDWATER �___ ---TECHNOLOGY INC