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Mr. James L. Barton <br /> June 20, 2008 <br /> Page 4 <br /> background well may not exist. However, MW-10 most closely represents an appropriate background well. <br /> As the microbial community changes in the hot wells by the influence of the AS/SVE system, the changes can <br /> be compared to the background well. By selecting a hot well from both of the targeted zones, shallow and <br /> deep, the differences in the microbial communities in each zone can also be compared to the background <br /> well, since none too little change in the microbial community is expected in the background well. One well <br /> from each impacted zone (MW-2 for the"B" zone and MW-8D for the"D" zone) will be representative for all <br /> wells in that respective zone. <br /> Performance Monitoring Reporting <br /> After the remediation systems have operated for six months and the performance monitoring events have <br /> been conducted, ENSR will provide the CVWB with a report documenting field activities, analytical reports, <br /> and tabulated results from the performance monitoring events. The results of the performance monitoring will <br /> be submitted 60 days after receipt of the last analytical report. Quarterly monitoring events for the Site, as <br /> directed by the Cleanup and Abatement Order# 5-00-707, will continue to be conducted, independent of the <br /> performance monitoring events. Following the initial six month operation and optimization of the upgraded <br /> AS/SVE systems, the Performance Monitoring Plan as presented will cease and continued performance <br /> monitoring will be based on the groundwater monitoring program and the San Joaquin Valley Air Pollution <br /> Control District permit requirements. <br /> If you have any questions regarding the Performance Monitoring Plan, please contact Ms. Jennifer Johnston at <br /> (916) 362-7100. <br /> Sincerely, <br /> ENSR Corporation <br /> JeJe ife�n / Kent D. Baugh,Vna�ger <br /> #C 28941 <br /> Project Manager Senior Program <br /> SIR iFESSIOyq <br /> cc: Ms. Stephanie Furgal, EMC ��� DEAN BgG�Fy <br /> Mr. Mike Infurna, San Joaquin County, Environmental Health Division <br /> Mr. Jay Allen, Stone Brothers Management Company rte*+ <br /> Ms. Nicole Gleason, Downey Brand No. C 28941 <br /> * Exp. 3 - 31--09 <br /> rl CMV \Q <br /> OF CAL1F�`�� <br /> 01231-154 <br /> ENSR AEQ)M <br />