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eoo9 is Associates rGeologists, Hydrogeologists and EngineersRE"MYEDD UV 0 6 2007 October ENVIRONMENT HEALTH 7N 2007-0044 PERMIT/SERVICES Mr. Ross Atkinson Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, CA 95670-6114 SUBJECT: THIRD QUARTER 2007 MONITORING REPORT FRENCH CAMP LANDFILL SAN JOAQUIN COUNTY, CALIFORNIA On behalf of Forward, Inc. (Forward), Geologic Associates is pleased to submit the thrid 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 R5-2007-0046. This report summarizes standard observations and presents the results of surface-water, groundwater, and soil-pore gas monitoring during the third 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 third quarter 2007 monitoring period are generally similar to those observed in previous monitoring periods. During the second quarter 2007 monitoring period, inorganic CLs were exceeded in DMP wells MW-6A,MW-9A, MW-9B, and MW-10A, and with the exception of the chloride concentration measured in well MW-10A,none of the constituents that exceeded a CL exhibited a significant increasing trend during the third quarter 2007 monitoring period. Previously, a NRD concluded that French Camp Landfill, located within the central Stockton area,has been impacted by saltwater intrusion and the elevated chloride concentration measured in well MW-l0A are believed to be the result of this condition and not the result of landfill-related impacts. Organic constituent results indicate the TCFM concentration was measured above the PQL in the sample collected from well MW-9A,and 1,2-DCE was measured at a trace concentration in the sample collected from well MW-9 B. The low level detections of TCFM in well MW-9A are believed to be related to the recently constructed final cover system and an associated increase in 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 monitoringwell MW-2 2 indicates that no VOCs were detected in the sample from this well during the current monitoring period. 16885 W. Bernardo Dr., Suite 305, San Diego, CA 92127 Phone: (858) 451-1136 Fax: (858) 451-1087