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9 <br />' 31 July 2000 <br /> �f AGE-NC Pi oJect No 98-0433 <br />' Page'4 of 5 . <br />' The highest concentration of dissolved hydrocarbons quantified as TPH-g and TPH-d is in <br /> the area of monitoring well MW-1 located adjacent to the former UST area TPH-g and TPH- <br /> d in gi ound water decrease eastwai d in the area of well MW-7 and decrease south of the <br />' former USTs, in the area of well MW-8 <br /> • The gieatest concentration of benzene was detected in well MW-1 Benzene was also <br />' detected in MW-2 The benzene plume is fully defined by MW-4 to the north, MW-3 and <br /> MW-5 to the west, MW-8 to the south and MW-7 to the east <br /> • MTBE was detected in wells MW-1, MW-2, MW-3 and MW-4 at concentrations ranging as <br />' high as 4,800 gg/1 The MTBE plume is generally defined by MW-8 to the south, MW-7 to <br /> the east,wells MW-3 and MW-5 to the west and to the north by well MW-4(MTBE detected <br /> at 9 0 dig/l) <br />' • DIPE and TBA were detected in well MW-8 at concentrations of 5 3 gg/1' and 13 dig/l, <br /> respectively <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE i ecommends the following <br />' o Quarterly monitoring at the site should be conducted to coincide with the monitoring <br /> performed at the Ripon Farm Service site The next monitoring event should be scheduled for <br />' August 2000 and should include sampling of on-site domestic wells for analysis for <br /> constituents of concern <br /> • A work plan for installation of necessary wells to assess feasibility of various corrective action <br />' alternatives should be prepared ' <br /> a A Cori ective Action Plan (CAP) should be prepared upon completion of the feasibility <br />' testing The CAP should include remediation feasibility studies(e g in-situ air sparging pilot <br /> test, soil vapor extraction, soil excavation and bio-enhanced remediation or attenuation) to <br /> determine appropriate remedial options for the site The CAP should also include a well <br />' receptor sui vey to determine if local domestic water wells (beyond the domestic well that 1 <br /> serves the Jimco site) may beat risk from the dissolved petroleum hydi ocarbon plume at the <br />' site <br /> Advanced GeoEnvcronmental,Inc <br />