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eoogic Associates Geologists, Hydrogeologists and Engineers January 26, 2007 JN: 2003-021 Mr. Ross Atkinson Central Valley Regional Water Quality Control Board 11020 Sun Center Drive#200, Rancho Cordova, CA 95670-6114 SUBJECT: FOURTH QUARTER 2006/ANNUAL MONITORING REPORT FRENCH CAMP LANDFILL SAN JOAQUIN COUNTY,CALIFORNIA On behalf of Forward, Inc. (Forward), Geologic Associates is pleased to submit the fourth quarter 2006 and Annual Monitoring Report for the French Camp Landfill, in compliance with the California Regional Water Quality Control Board- Central Valley Region(RWQCB) Waste Discharge Requirement(WDR) Order Number R5-2004-0159. This report summarizes standard observations and presents the results of surface-water and groundwater monitoring during the fourth quarter 2006, and also summarizes the monitoring results obtained for the 2006 monitoring year. A summary of analytical results and time-series concentration plots for field and monitoring parameters are also included in this report. A description of field procedures and sampling protocols followed by personnel conducting field monitoring activities is included in Appendix B of the report. Groundwater quality conditions beneath the French Camp Landfill during the fourth quarter 2006 monitoring period are generally similar to those observed in previous monitoring periods. During the fourth quarter 2006 monitoring period, one or more inorganic CLs were exceeded in DMP wells MW-9A, and MW-10A. Organic results indicate that excluding suspected field/laboratory contaminants, a trace level concentration of 1,2-dichloroethane(1,2-DCA)was measured in the sample collected from well MW-9B and concentrations of trichlorofluoromethane(TCFM)was detected above the practical quantitation limit(PQL)in the sample collected from well MW-9A. Pursuant to WDR Order No. R5-2004-0159 Section E(19)(b)(2) a non-statistical indication of a release from well MW-9A has been verified and the RWQCB was immediately notified of the release. Since TCFM is a common constituent found in landfill gas and the final cover was recently completed at the site, Forward has proposed quarterly soil-pore gas monitoring in perimeter soil-pore gas probes for fixed gases(carbon dioxide, oxygen, nitrogen, and methane) and VOCs for the next year to evaluate the significance of landfill gas at the site. The results of water quality analyses completed for leachate monitoring well MW-2 indicates that no VOCs were measured during the current monitoring period. 16885 W. Bernardo Dr., Suite 305, San Diego, CA 92127 Phone: (858) 451-1136 Fax: (858) 451-1087