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' 30 June 2003 <br /> AGE-NC Project No 9 8-043 3 <br />' Page 4 of 4 <br />' • Benzene was detected in the sample from well MW-1 at a concentration of 270 4g/1, above <br /> the DHS' Maximum Contaminant Level Benzene was detected in well MW-6 <br /> • MTBE was detected in wells MW-1, MWand MW-8 at concentration of as great at <br />' 3,000 pg/l, which are significantly above the DHS' primary MCL TAME was detected in <br /> sample from well MW-9 <br /> • <br /> Except for MTBE and TPH-Agin southernmost well MW-8 and excessive concentrations of <br />' TPH- d in easternmost well MW-6 the lateral extent of dissolved hydrocarbons is defined <br /> g/ Y <br />' by the current well network The vertical extent of MTBE at the former UST area is not <br /> defined below a depth of 40 feet, bsg <br />' 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends <br /> • Continued quarterly monitonng at the site, the next monitoring event should be scheduled <br /> lie <br /> for August 2003 Coordinate the ground water monitonng activities of Jimco Truck Plaza <br /> and the adjacent Ripon Farm Service (22871 South Highway 99) to occur concurrently <br />' • Preparation of an assessment work plan for the dissolved MTBE southwest of well MW-9, <br /> at the UST/MW-9 area and high TPH concentrations (free-product) east and north of well <br /> MW-6 <br />' e Preparation of a Corrective Action Plan (CAP) to mitigate the dissolved MTBE near the <br /> former UST location <br />' • The plan currently implemented for free-product removal/recovery should be continued <br />' 6.0. 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 <br /> upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br /> conditions at the site for the purpose of this investigation were made from a limited number of <br />' available data points (I a 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 />' interpretations, opinions and recommendations contained in this report <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br /> 1 , <br />