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Soil Excavation and Second Quarter Post-Treatment Monitoring and Sampling Report 8 <br /> • The Southland Corporation,Store#20104,455 Grant Line Road,Tracy,GA _ June 9, 1998 <br /> Downgradient well MW-5 has not contained detectable benzene or TPH-G concentrations in any of the <br /> samples collected since March 20, 1996 <br /> From the recent groundwater monitoring and sampling data,the highest benzene and TPH-G <br /> concentrations were detected in well MW-16 at 730 pg/L and 13,000 pg/L, respectively Low dissolved <br /> oxygen levels(1 2 mg/L to 2 5 mg/L) in source area wells GWE-1, MW-1, MW-16 Indicate that natural <br /> biodegradation of hydrocarbons has occurred In areas with elevated hydrocarbon concentrations Based <br /> on the removal of approximately 200 cubic yards of hydrocarbon-Impacted sod In the excavation northeast <br /> of the former tank pit,the dissolved benzene and TPH-G concentrations In source well MW-16 are <br /> expected to drop significantly <br /> If,following two additional quarters of groundwater sampling, benzene and TPH-G concentrations decrease <br /> In source well MW-16, Fluor Daniel GTI, on behalf of the Southland Corporation,wit request that site be <br /> classified as low nsk under State Water Resources Control Board policies and that no further action be <br /> required at the site based on 1)the low to moderate residual hydrocarbon concentrations in the remaining <br /> soil at the site which are expected to decline over time, 2) naturally occurring biodegradation of the <br /> dissolved hydrocarbon plume which Is expected to continue, 3)data indicating that the dissolved <br /> hydrocarbon plume Is stable and Is not a threat to any nearby water producing wells,4)the absence of <br /> MTBE and other gasoline oxygenates In the samples collected from existing site monitoring wells <br /> • <br /> FLUOR DANIEL GTI <br />