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comparison of upgradient (SW-1 and SW-2) to downgradient(SW-3) surface water <br /> samples indicates generally similar inorganic constituent concentrations in the upgradient <br /> and downgradient surface water station, suggesting that the landfill is not impacting <br /> surface water quality. During the current monitoring period, no CL were exceeded, and <br /> with the exception of turbidity in all three surface-water samples, no statistically <br /> significant increasing trends were noted. Since turbidity exhibits a statistically significant <br /> increasing trend at background surface water stations SW-1 and SW-2, the increasing <br /> trend in turbidity at SW-3 is unlikely to be indicative of an impact from the facility. <br /> The results of the COC sampling conducted during the monitoring period indicates that <br /> excluding the metals, no COCs were detected in groundwater, leachate, and surface water <br /> samples. Several MCL exceedances were measured for arsenic, iron, and manganese in <br /> surface water and/or groundwater monitoring points. However, given the fact that <br /> elevated arsenic, iron, and manganese concentrations were measured in background wells <br /> and upgradient surface water stations, the MCL exceedances do not appear to be related <br /> to a release from the landfill. <br /> Field screening results from soil-pore gas monitoring probes indicate that no methane <br /> was measured in soil-pore gas monitoring probes during the monitoring period, or over <br /> the past year. <br /> 8.0 REFERENCES <br /> California Regional Water Quality Control Board, Central Valley Region, 2007, "Order <br /> No. R5-2007-0046 Waste Discharge Requirements for Forward Inc. Allied Waste <br /> Industries Inc. for Post-Closure Maintenance of French Camp Municipal Solid <br /> Waste Landfill, San Joaquin County". <br /> CH2M Hill. 2000. Fourth Quarter/Annual 1999 Monitoring Report,Austin Road <br /> Landfill. January. <br /> Herst &Associates ("Herst"). 2005. No Release Demonstration—Second Quarter 2004 <br /> Event, French Camp Landfill. January. <br /> Herst &Associates("Herst"). 2009. Statistical Analysis of third quarter 2009 <br /> Groundwater Sampling Results, French Camp Landfill. <br /> D:\2008-0012TC2SA09.doc <br /> — <br /> 9 Geologic Associates <br />