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10 rune 1999 <br /> AGE-NC Project No 98-0450 <br /> Page 4 of 5 <br /> ' UST area <br /> • MTBE was detected at concentrations greater than the State of Californma Action Limit of <br /> 4 µg/l an ground water samples collected from all four wells MTBE was encountered an <br /> ' ground water samples at concentrations ranging up to 290 µg/l (BMW-4) by EPA 8260 <br /> Modified <br /> • The concentrations of benzene exceeds the state maximum contaminant level (MCL) of 1 <br /> ppb in wells BMW-1, BMW-2, BMW-3, BMW-4 and MW-5 <br /> ' • The concentration of xylenes in BMW-4 (19,000µg/l) exceeds the MCL of 1,750 µg/l <br /> • The greatest concentration of dissolved hydrocarbons continues to be an the area of well <br /> BMW-4 The greatest concentration of dissolved MTBE is in area of well BMW-4 <br /> • The plume of impacted ground water with benzene above 10 µgll is not defined south of the <br /> well MW-5 <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected from the site,AGE recommends <br /> • Continue quarterly monitoring and sampling The next monitoring event should be scheduled <br /> for late August 1998 <br /> ' • Based on the concentration of ground contamination ground water remediation is necessary <br /> at the site A Corrective Action Plan (CAP) should be prepared The CAP should include a <br /> ' minimum of three remediation feasibility studies (e g in-situ air spargang pilot test, soil <br /> vapor extraction and select bio-enumerations) to determine appropriate remedial options for <br /> the site <br /> ' A ground water well survey for the site should be included in the CAP <br /> 1 <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />