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ANNUAL SUMMARY <br /> MONITORING <br /> ' Groundwater <br /> General Water Quality Parameters <br /> ' An evaluation of the second semester 2003 groundwater monitoring data shows that all <br /> constituents were within interwell tolerance limits except for Chloride and Sulfate concentrations <br /> in LW-1 and Chloride and Nitrate concentrations in MW-3. Three of the four exceedences were <br /> slightly higher than the concentration limits. <br /> For the first semester the concentration limit of Chloride was exceeded in well LW-1. The <br /> concentration limit of Nitrate was exceeded in wells MW-2 and MW-3. Chloride and Nitrate <br /> concentrations will be closely monitored. Proposed site improvements, including improving cover <br /> and drainage of the shallow refuse lift at the north-west edge of Module "I" should decrease the <br /> potential for water percolation in that area. <br /> VOCs <br /> VOCs were reported in the four monitoring wells this year. One was reported for the first <br /> semester,nine were reported in the second semester. In all instances,the constituents were also <br /> found in one or more quality control blanks and are therefore "false positives". Re-sampling was <br /> not required this year. <br /> At MW-3,VOCs have not been detected since October 2001. <br /> ' Surface Water <br /> ' Surface water samples were not obtained when attempted this year. Water was present,but not <br /> flowing at those times. Further attempts will be made to sample surface water when conditions <br /> permit. <br /> HISTORICAL TIME SERIES PLOTS <br /> Historical Time Series Plots are presented in Appendix F. Note that constituents not detected are <br /> ' plotted at a value of half their respective detection limits. Outliers were included in the plots as <br /> directed by RWQCB staff. <br /> Foothill Sanitary Landfill 9 Department of Public Works/Solid Waste <br /> 2ND Semester/Annual 2003 Groundwater Monitoring County of San Joaquin-Revised June 29,2004 <br />