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Ilk t %N110 c S.;ae 26 July 2011 AGE-NC Project No. 95-0137 Page 2 of 3 SCOPE OF WOR / A total of sev ground water monitoring wells (MW-1 through MW5, MW-9 and MW-10) have been 4istalled on-site. Additionally, two duA completed ground water remediation we�l,s_(VW-i12), four'dedicated air-sparging wblls and eleven soil vapor extraction wells to -- -various depth.Well construction details and boring logs were included in the AGE prepared I� No Further Action Request (NFAR), dated 10 November 2009. Elevated concentrations of petroleum hydrocarbons were detected in deep soil samples collected during the remediation confirmation boring installation. Analytical results of soil samples are summarized in NFAR. Between May 1994 and May 2009, ground water monitoring events were performed at the site to monitor dissolved petroleum hydrocarbon concentrations in ground water. As described in the AGE-prepared NFAR, petroleum hydrocarbons have not been detected in ground water monitoring wells. Low concentrations of dissolved petroleum hydrocarbon constituents were detected during the ground water sampling event from wells near well MW-2, 1,2-dichloroethene was detected in two monitoring wells (MW-4 and MW-9). Analytical results of ground water samples are summarized in the NFAR. AGE proposes to drill out impacted wells, and destroy the remaining boring trace with portland cement. The remaining wells will be destroyed with a pressure grout technique.- All wells will be destroyed under permit in accordance with the San Joaquin County Environmental Health Department (EHD) Standards For Well Construction and Destruction. PROCEDURES As required, a health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities(National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to drilling activities, each proposed drilling location will be clearly marked and an utility clearance obtained through Underground Service Alert. Prior to destruction activities, wells will be checked for total depth and integrity using a Solinst water level meter. Any obstructions found in the well will be removed. Impacted wells will be drilled-out to the total depth of the well, utilizing eight-inch or ten-inch diameter hollow-stem augers. Monitoring wells MW-4, MW-9 and MW-10, along with vapor well VW-1 are proposed to be drilled out. Advanced GeoEnvironmental,Inc.