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' 30 June 2003 <br /> • AGE-NC Project No 95-0103 <br /> Page 7 of 7 <br /> ' • The benzene concentration in well MW-4 continues to show a decline,however,the detected <br /> concentration of 3 6µg/l is above the DHS'Maximum Contaminant Level(MCL)of 1 0µg/l <br /> in drinking water <br /> • MTBE concentrations present in groundwater monitoring wells increased and the maximum <br /> MTBE concentration of 160 pg/1 (MW-5) exceeds the MCL of 5 0 µg/1 for drinking water <br /> ' 5 0. RECOMMENDATIONS <br /> Based upon the results ofthe fourth quarter 2002 ground water monitoring event,AGE recommends <br /> ' • Continued quarterly ground water mozutorzng at the site as required by California Code of <br /> Regulations, the next monitoring event should be scheduled for July 2003 <br /> ' • Continued operation and maintenance of the ground water extraction and treatment system <br /> during the second and third quarters of 2003, AGE will evaluate the performance of the <br /> ground water extraction system at the end of third quarter 2003 <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 upon <br /> analytical results provided by an independent laboratory Evaluation of the hydrogeologf c conditions <br /> at the site for the purpose of this investigation have been made from review of reports prepared by <br /> ' previous consultants and AGE, and a limited number of available data points (e g , ground water <br /> samples from monitoring and recovery wells) Subsurface conditions may vary away from these data <br /> points No other warranty, expressed or implied, is made as to the professional interpretations, <br /> ' opinions and recommendations contained in this report <br /> i <br /> i <br /> • <br /> ' Advanced GeoEnvironmental,Inc <br /> rr <br />