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Water Quality Monitoring Report <br /> ` French Camp Landfill <br /> 4.4.1 Concentration Limits <br /> For DMP monitoring wells at the French Camp Landfill, concentration limits (CLs) provided in <br /> WDR 115-2007-0046 are used for the water quality protection standards (WQPS). All CLs are <br /> provided in Table 2 for comparison with current monitoring data. The following table presents <br /> constituents that were found to exceed a CL: <br /> CONSTITUENT CONCENTRATION DMP MONITORING WELLS <br /> LIMIT MW-6A* MW-7A- MW-8A I MW-9A I MW-9B MW-10A <br /> GENERAL CHEMISTRY(mg/L) <br /> Chloride 249 450 660 <br /> Total Dissolved Solids 1600 1800 <br /> Specific Conductance 2500 3504 <br /> (µmhos/cm) <br /> NOTES: (*)—Background Well. <br /> A shaded cell indicates that the current value was measured below the CL. <br /> Only constituents that exceeded a CL are provided in the table above. All CLs are provided in Table 2. <br /> 4.4.2 Non-Statistical Data Analysis <br /> The non-statistical VOC water analyses were performed on the DMP well data collected during the <br /> monitoring period. Non-statistical exceedances were identified at wells MW-6A and MW-9A. <br /> These exceedances are the result of quantifiable concentrations of chloroform and <br /> trichlorofluoromethane (TCFM) measured in well MW-6 and MW-9A, respectively. <br /> Confirmation sampling was not performed since these compounds have already been <br /> confirmed in each respective well. The TCFM concentration measured in well MW-9A is well <br /> below risk-based concentrations and continues to exhibit decreasing concentrations. Given the <br /> distance of well MW-6A from the landfill (approximately 0.25 miles upgradient), the chloroform <br /> concentrations measured in well MW-6A are not believed to be the result of a release from the <br /> landfill. <br /> In order to evaluate changes in water quality in DMP wells at the French Camp Landfill, Sen's <br /> Slope trend analyses were performed for those constituents exceeding a CL. During the <br /> monitoring period, no statistically significant increasing temporal trends were calculated for <br /> constituents exceeding a CL and current concentrations measured in these wells within the <br /> historical range of values for these wells. Trend analyses are presented in Appendix D. <br /> 4.5 Leachate Monitoring <br /> The laboratory results for leachate monitoring well MW-2 are summarized in Table 3. As shown <br /> on Table 3, no VOCs were detected in leachate monitoring well MW-2 during the monitoring <br /> period. <br /> Project No.2015.0014 4 <br />