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eoogic Associates Geologists, Hydrogeologists and Engineers April 27, 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: FIRST QUARTER 2007 MONITORING PORT FRENCH CAMP LANDFILL SAN JOAQUIN COUNTY, CALIFORNIA On behalf of Forward, Inc. (Forward), GeoLogic Associates is pleased to submit the.first quarter 2007 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, groundwater, and soil-pore gas monitoring during the first quarter 2007. 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 first quarter 2007 monitoring period are generally similar to those observed in previous monitoring periods. During the first quarter 2007 monitoring period, inorganic concentration limits (CLs)were exceeded in wells MW-9A, MW-9B, and MW-10A. In addition, organic constituent results indicate concentrations of trichlorofluoromethane exceed the practical quantitation limit (PQL) in the sample collected from well MW-9A, which is likely related to the recently constructed final cover system, and an associated increase in landfill gas (LFG) generation. In a meeting with the RWQCB on March 9, 2007, Forward proposed quarterly monitoring of existing groundwater monitoring wells and soil-pore gas probes through May 2008 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 volatile organic compounds (VOCs)were detected in the sample from this well during the current monitoring period. The results of water quality analyses completed for surface-water monitoring stations are generally consistent with previous results and with the exception of bromoform, bromodichloromethane, and dibromochloromethane at background station SW-2, no CL exceedances were noted during the first quarter 2007 monitoring period. Of note, similar 16885 W. Bernardo Dr., Suite 305, San Diego, CA 92127 Phone: (858) 451-1136 Fax: (858) 451-1087