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presented in Appendix D. Based on a comparison of the data obtained during the current <br /> monitoring period,the following analytes were found to exceed a CL: <br /> CONSTITUENT Concentration DMP Monitoring Wells <br /> Limit -6A* MW-7A*I MW-8A I MW-9A I MW-9B MW-10A <br /> GENERAL CHEMISTRY(mg/1) <br /> Calcium 127.8 140 <br /> Chloride 271.4 430 <br /> Potassium 2.153 3.8 <br /> NOTES: (*)—Background Well. <br /> Trend Analysis <br /> In order to evaluate changes in water quality in DMP wells at the French Camp Landfill, <br /> historical groundwater data were evaluated using Sen's Slope trend analyses to determine <br /> if significant increasing or decreasing trends were evident. Trend analyses, performed by <br /> Herst&Associates, are presented in Appendix D and summarized below. <br /> Well Number Increasing Trends Decreasing Trends <br /> MW-6A Specific Conductance pH <br /> MW-7A Bicarbonate Sulfate,TDS <br /> MW-8A None Apparent Nitrate-N <br /> MW-9A None Apparent None Apparent <br /> MW-9B Sulfate None Apparent <br /> MW-10A Chloride Nitrate-N <br /> As shown above, CLs were exceeded for three inorganic constituents in the sample <br /> collected from well MW-913. However,none of the constituents that exceeded a CL <br /> exhibited a significant increasing trend during the monitoring period. <br /> 4.5 LEACHATE MONITORING <br /> The laboratory results for leachate monitoring well MW-2 are summarized in Table 3 and <br /> time-series concentration plots are presented in Appendix D. As shown on Table 3, no <br /> VOCs were measured in leachate monitoring well MW-2 during the monitoring period. <br /> 4.6 SURFACE-WATER MONITORING <br /> Field and laboratory results for surface-water monitoring stations (SW-1, SW-2, and <br /> SW-3) for the current monitoring period are summarized in Table 4. Locations SW-1 <br /> and SW-2 are located upstream of the landfill within the Walker and French Camp <br /> Sloughs,respectively, and are used as background sampling points, while SW-3 is <br /> located downstream of the landfill at the confluence of the two sloughs. Water quality <br /> data from surface-water sampling stations were graphed on time-series concentration <br /> plots and are presented in Appendix D. For the surface water monitoring stations at the <br /> French Camp Landfill, CLs are used for the WQPS. The CLs shown in Table 4 were <br /> calculated by Herst&Associates using Sanitas, a state-approved statistical software <br /> program using historical data from background surface water stations SW-1 and SW-2, <br /> and are presented in Appendix D. As shown in Table 4, carbon disulfide was detected at <br /> D:000&W12\1FC 1SA08re 1.doc <br /> 4 Geologic Associates <br />