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' 09 October 2000 <br /> .' AGE-NC Project No. 98-0432 <br /> ' Page 3 of 3 <br /> Analytical results from ground water samples are summarized in Tables 2 and 3. The laboratory <br /> ' reports(MAI Laboratory ID 45768 to 45771),quality assurance and quality control(QA/QC)reports <br /> and chain-of-custody forms are included in Appendix B. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> ' The following conclusions were drawn from the results of this investigation: <br /> I <br /> • During this quarter,the prevailing ground water flow direction is towards the north-northeast <br /> which is consistent with flow direction determined during previous monitoring events. <br /> • TPH-d was only detected in MW-1 and MW-2 at slightly lower concentrations than last <br /> ' quarter. TPH-g was detected in MW-1 and MW-2 this quarter and the concentrations have <br /> risen since the last monitoring event. <br /> ' • MTBE was detected in wells MW-1, MW-2 and MW-3 during this monitoring event. The <br /> concentrations of MTBE detected in well MW-1 has declined slightly since the last quarter <br /> • monitoring event, however,the concentrations did increase in wells MW-2 and MW-3.The <br /> ' detected MTBE concentrations in the three monitoring wells exceed the State of California <br /> maximum contaminant level (MCL) of 13 µg/l. <br /> 5.0. RECOMMENDATIONS <br /> ' Based on the results of this investigation, AGE recommends: <br /> ' • A quarterly monitoring event should be scheduled for November 2000. <br /> • Implement additional assessment of MTBE in soil and ground water. <br /> 1 Immediate initiation of ground water extraction from wells MW 1 .and MW2 to prevent i <br /> further migration of MTBE-impacted ground water. <br /> rt <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 upon <br /> ' analytical results provided by an independent laboratory.Evaluations of the geologic/hydrogeologic <br /> . conditions at the site for the purpose of this investigation are made from a limited number of available <br /> data points (i.e. ground water samples), and subsurface conditions may vary away from these data <br /> apoints. No other warranty, expressed or implied, is made as to the professional recommendations <br /> contained in this report. <br /> L <br /> ' Advanced GeoEnvironmen jai,Inc. <br />