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CONSTITUENT Concentration DMP Monitoring Wells <br /> Limit MW-6A*I MW-7A*I MW-8A I MW-9A I MW-911 I MW-10A <br /> GENERAL CHEMISTRY(mg/l,except as noted) <br /> arium 0.46 0.610 0.700 <br /> alcium 156.4 160 <br /> hioride 241 340 <br /> ' H 7.879 9.1 <br /> otassium 2.192 2.6 3.4 <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 None Apparent pH <br /> ' MW-7A None Apparent Sulfate <br /> MW-8A None A anent 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 one or more constituents in the samples <br /> collected from wells -8A and -9 . However,none of the constituents that <br /> exceeded a CL exhibited a significant increasing trend. <br /> 5.5 LEACHATE MONITORING <br /> The laboratory results for leachate monitoring wells MW-lA and MW-2, constructed <br /> through waste, are summarized in Table 3 and time-series concentration plots are <br /> presented in Appendix D. As shown on Table 3, eight VOCs were measured in leachate <br /> monitoring well MW-lA during the second quarter 2006 monitoring period,with three <br /> ' measured above the practical quantitation limit(PQL). In addition, one estimated trace <br /> level VOC (chloroform)was detected in leachate monitoring well MW-2. <br /> ' 5.6 SURFACE-WATER MONITORING <br /> Second quarter 2006 field and laboratory results for surface-water monitoring stations <br /> ' (SW-1, SW-2,and SW-3) are summarized in Table 4. Locations SW-1 and SW-2 are <br /> located upstream of the landfill within the Walker and French Camp Sloughs, <br /> ' respectively, and are used as background sampling points,while SW-3 is located <br /> downstream of the landfill at the confluence of the two sloughs. Water quality data from <br /> surface-water sampling stations were graphed on time-series concentration plots and are <br /> ' presented in Appendix D. For the surface water monitoring stations at the French Camp <br /> Landfill, CLs are used for the WQPS. The CLs shown in Table 4 were calculated by <br /> Herst &Associates using Sanitas , a state-approved statistical software program using <br /> D:2003 021\FC_sp06.doc <br /> 4 Geologic Associates <br />