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Water Quality Monitoring Report <br /> French Camp Landfill <br /> 4.4 Detection Monitoring Program <br /> Field and laboratory results from the current monitoring period for DMP monitoring wells (MW- <br /> 6A, MW-7A, MW-8A, MW-9A, MW-913, and MW-10A) are summarized in Table 2 and time- <br /> series concentration plots are presented in Appendix D. <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-9113 MW-10A <br /> GENERAL CHEMISTRY(mg/L) <br /> pH(Units) 6.9-10.21 6.81 6.63 <br /> Chloride 249 430 790 <br /> Specific Conductance 2500 3768 <br /> (µmhos/cm) <br /> ® Total Dissolved Solids 1600 2200 <br /> (TDS) <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 measured in <br /> well MW-6A and trichlorofluoromethane (TCFM) measured in well MW-9A. Confirmation <br /> sampling was not performed since these compounds have already been confirmed in each <br /> respective well. Trend analyses performed for these non-statistical exceedances indicate no <br /> statistically significant increasing trends. Trend analyses are included in Appendix D. The TCFM <br /> concentration measured in well MW-9A is well below risk-based concentrations and has been <br /> attributed to landfill gas (LFG). Given the distance of well MW-6A from the landfill <br /> (approximately 0.25 miles), the chloroform concentrations measured in well MW-6A are not <br /> believed to be the result of a release from the landfill. <br /> Project No.2014.0012 FC 2SA14 Report.docx 4 <br /> 1/20/2015,Rev.0 <br />