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FORWARD LANDFILL 9999 S.Austin Road Manteca,CA 95336 (209)982-4298,Fax(209)982-1009 January 29, 2013 RN: 2012-0027 i'vir. Ross Atkinson Central Valley Regional Water Quality Control Board 11020 Still Center Drive,#200 Rancho Cordova, CA 95670-6114 SUBJECT: JULY—DECEMBER 2012 SEMIANNUAL/ANNUAL WATER QUALITY MONITORING REPORT FRENCH NCH CA'MP LANDFILL SAN JOAQUIN COUNTY,CALIFORNIA Forward, Inc.(Forward) is pleased to submit the July through December 2012 semiannual and annual monitoring report for the French Camp Landfill, in compliance with the California Regional Water Quality Control Board- Central Valley Region(RWQCI.3) Waste Discharge Requirement(NVDR)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 semiannual (July I through December 31,2012)monitoring period. This report also presents an annual sunirnary for the site. During the monitoring period and over the 2012 monitoring year, no violations have been issued for the facility. Groundwater quality conditions beneath the French Camp Landfill during the monitoring period and over.the 2012 year are generally similar to those observed during, previous monitoring periods. Concentration limits(CLs)were exceeded for chloride in the samples collected from wells MW-913 and 1W-10A; for total dissolved solids(TDS)at well MW-1 OA; and for trichlorofluorotnethane(TCFM)at well MW-9A. Hw'vever, with the exception of the chloride concentration measured in well MW-10A, none of the constituents that exceeded an established CL exhibited a statistically significant increasing trend. In January 2005,a No Release Demonstration(NRD)was performed by Herst& Associates(2005)as a result of CL exceedances for chloride and TDS at groundwater monitoring well MW-I OA. The NRD concluded that French Camp Landfill, located within the central Stockton area, has been impacted by saltwater intrusion and the elevated chloride and TDS concentrations measured in well MW-I OA are believed to be the result of this condition and not the result of landfill-related impacts. TCFi'vl was measured above the practical quantitation limit(PQL)in the sample collected from well MW-9A. Confirmation sampling was not performed since TCFM has already been confirmed in this-well. However,the TCF concentration measured in well MW-9A is well below risk-based concentrations and statistically significant decreasing trend was calculated for the TCF?vl concentrations at this well.