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1 " <br />' 12 December 2001 <br /> AGE-NC Project No 98-0433 <br />' Page 4 of <br />' 0 Benzene was detected in the sample from well MW-2 The dissolved benzene plume is <br /> currently constrained by well MW-4 to the north, wells MW-3 and MW-5 to the west, well <br /> MW-8 to the south and well MW-7 to the east <br />' 0 MTBE was detected in wells MW-1 and MW-2 at significant concentrations above the <br /> California maximum contaminant levels The dissolved MTBE plume is generally defined <br />' 0 DIPE, TAME and TBA were detected in wells MW-1, MW-2 and MW-8 <br /> 5.0. RECOMMENDATIONS <br />' Based on the results of this investigation, AGE recommends <br /> Continued quarterly monitoring at the site The next monitoring event should be scheduled <br /> rfor January 2002 for analysis for constituents of concern <br /> • Performance of additional assessment of the dissolved TPH-d near well MW-6, with the <br /> installation of additional ground water monitoring wells <br /> o Preparation of a Corrective Action Plan (CAP) upon completion of vertical assessment and <br />' analysis of feasibility testing analysis The CAP should include remediation feasibility studies <br /> (e g in-situ air spargrng pilot test, soil vapor extraction, soil excavation and bio-enhanced <br /> remediation or attenuation)to determine appropriate remedial options for the site The CAP <br />' should also include a well receptor survey to determine if local domestic water wells(beyond <br /> the domestic well that serves the Jimco site) may be at risk from the dissolved <br /> petroleum-hydrocarbon plume at the site <br /> 6.4 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br />' environmental consultants practicing in this or similar localities The findings were based mainly upon <br /> analytical results provided by an independent laboratory Evaluations of the geologrc/hydrogeologic <br /> conditions at the site for the purpose of this investigation were made from a limited number of <br /> I available data points (l e ground water samples), and subsurface conditions may vary away from <br /> these data points No other warranty,' expressed or Implied, is made as to the professional <br /> recommendations contained in this report <br /> • <br /> Advanced GeoE nvi ronmental,Inc <br />