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6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 61 CONCLUSIONS <br />' 6 1 1 Hydrology <br /> rology <br />' July 1987 marked the shallowest groundwater level measurements of 35 feet bgs at <br /> the site Long term water level data for nearby production wells indicates a similar, <br /> brief period of shallow water levels persisting for four years, between 1983 and <br /> 1987 <br /> rWater levels at the site have declined from 35 feet to approximately 61 feet, <br /> representing a net decline of 26 feet <br />' r <br /> G oundwater levels are unlikely to recover to former levels in the foreseeable future <br />' as a result of continuing regional overdraft <br /> • If groundwater levels were to rise, the recovery would require several years, and the <br /> shallow water levels would probably persist for only a few years <br />' • Site monitoring wells are completed in a shallow (less than 150 feet bgs) unconfined <br /> aquifer <br /> • The downgradient well nearest to the site is approximately 4,000 feet to the northwest <br /> and is screened in the deeper, semiconf ned aquifer below 150 feet bgs <br /> 61 2 Soils <br /> • <br /> Approximately 47 percent of <br /> the TPH/D at the site has been removed, treated and <br />' disposed at a Class II landfill <br /> • Approximately 88 percent of the remaining soil has a concentration less than 5,000 <br /> mg/kg <br /> • Over 2,000 cubic yards of soil was treated by an innovative soil treatment technique <br /> ell <br /> which resulted in biodegradation of over 24,000 lbs of TPH/D <br />' <br /> SAC 116 07 15 AUGUST 1994 <br /> DAMES & MOORE <br />