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FORWARD LANDFILL 9999 S.Austin Road Manteca,SCA 95336 (209)9824298,Fax(209)982-1009 July 26,2010 JN:2009-0018 Mr. Ross Atkinson Central Valley Regional Water Quality Control Board 11020 Sun Center Drive,#200 Rancho Cordova,CA 95670-6114 SUBJECT: JANUARY—JUNE 2010 FIRST SEMIANNUAL WATER QUALITY MONITORING REPORT FRENCH CAMP LANDFILL SAN JOAQUIN COUNTY,CALIFORNIA- Forward,Inc.(Forward).is pleased to submit the January through June 2010 semiannual 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 from the serniamntal(January 1 through June 30, 2010)(monitoring period). 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 monitoring period are generally similar to those observed in previous monitoring periods. Concentration limits (CLs)were exceeded for a constituent in the samples collected from background well MW-6A, and compliance wells MW-9A and MW-9B. It should be noted,however,that none of the constituents that exceeded a CL exhibited a statistically significant increasing trend during the monitoring period. Organic constituent results indicate chloroform was measured above the practical quantitation limit in the sample collected from wells MW-6A. However, a similar concentration of chloroform was also detected in the QA/QC field blank. The presence of chloroform in well MW-6A is not believed to the result of a release from the landfill since chloroform has been rarely detected in on-site wells and background well MW-6A is located approximately 1200 feet cross-gradient from the landfill. The results of water quality analyses completed for surface-water monitoring stations are generally consistent with previous results. During the monitoring period,trace level concentrations of toluene were detected in all three surface water stations. It should be noted, however, that toluene is a common field/laboratory contaminant. With the exception of turbidity in all three surface-water samples,no statistically significant increasing trends were noted. Since