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CONSTITUENT Concentration I DMP Monitoring Wells <br /> Limit MW-6A- MW-7A- MW-8A MW-9A MW-9B MW-l0A <br /> ENERAL CHEMISTRY m n <br /> Chloride 249 426 <br /> H 6.9—10.21 6.51 1 6.62 <br /> NOTES: (*)—Background Well. <br /> Suspected field/lab contaminant. <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 for temporal trends using Mann-Kendall/ <br /> Sen's Slope trend analyses to determine if significant increasing or decreasing trends <br /> were evident. Trend analyses,performed by Herst& Associates, are presented in <br /> Appendix D and summarized below. <br /> Well Number Increasing Trends Decreasing Trends <br /> MW-6A None Apparent Calcium,Magnesium,pH <br /> MW-7A None 4parent Chloride, Specific Conductance,TDS <br /> MW-8A None Apparent Bicarbonate,Magnesium,Nitrate-N,TDS <br /> MW-9A None Apparent None Apparent <br /> MW-9B Potassium,Sulfate pH <br /> MW-10A Chloride Nitrate-N <br /> As summarized above, one CL was exceeded in each of the samples collected from wells <br /> MW-6A,MW-913, and MW-10A. It should be noted,however, that none of the <br /> constituents that exceeded a CL exhibited a statistically significant increasing trend <br /> during the monitoring period. <br /> 4.5 LEACHATE MONITORING <br /> The laboratory results for leachate monitoring well MW-2 are summarized in Table 3. <br /> As shown on Table 3, no VOCs were detected in the sample collected from leachate <br /> 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. During the <br /> monitoring period,no VOCs were detected in any of the surface water samples. <br /> Historical data from the surface water monitoring points were evaluated for temporal <br /> trend using Mann-Kendall/Sen's Slope trend analysis. During the monitoring period, <br /> statistically significant increasing trends for turbidity were calculated at surface water <br /> D:\zo11-0051\FC_IsAII.docx 4 GBoLogic Associates <br />