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• REPUBLIC SERVICES January 26, 2018 JN: SO17.1030 Mr. Brendan Kenny Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, CA 95670-6114 SUBJECT: JULY—DECEMBER 2017 SEMIANNUAL/ANNUAL WATER QUALITY MONITORING REPORT FRENCH CAMP LANDFILL SAN JOAQUIN COUNTY, CALIFORNIA Forward, Inc. (Forward) is pleased to submit the July through December 2017 semiannual 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 R5-2007-0046. This report summarizes standard • observations and presents the results of surface-water, groundwater, and soil-pore gas monitoring from the semiannual (July 1 through December 31, 2017) monitoring period. This report also presents an annual summary for the site. During the monitoring period, no violations have been issued for the facility. Groundwater quality conditions beneath the French Camp Landfill during the monitoring period and over the 2017 year are generally similar to those observed during previous monitoring periods. During monitoring period, inorganic concentration limits (CLs) were exceeded for chloride in the samples from wells MW-9B and MW-10A; nitrate as nitrogen in wells MW-6A and MW-8A; and total dissolved solids in well MW-10A. However, no increasing trends were calculated for the CL exceedances. With the exception of chloroform at well MW-6A, no volatile organic compounds (VOCs)were detected above a practical quantitation limit in groundwater samples collected during the 2017 monitoring year. Chloroform has been previously confirmed in retest samples at well MW-6A and does not exhibit an increasing trend. Given the distance of well MW-6A from the landfill, the chloroform concentrations measured in well MW-6A are not believed to be the result of a release 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, no VOCs were detected in the surface water samples collected. The field screening results from soil-pore gas monitoring probes indicates that methane was not detected above 0.1 percent by volume at any French Camp Landfill soil-pore gas monitoring probe during the monitoring year.