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i ANNUAL SUMMARY MONITORING i Groundwater General Water Quality Parameters An evaluation of the second semester 2003 groundwater monitoring data shows that all constituents were within interwell tolerance limits except for Chloride and Sulfate concentrations in LW-1 and Chloride and Nitrate concentrations in MW-3. Three of the four exceedences were slightly higher than the concentration limits. For the first semester the concentration limit of Chloride was exceeded in well LW-1. The i concentration limit of Nitrate was exceeded in wells MW-2 and MW-3. Chloride and Nitrate concentrations will be closely monitored. Proposed site improvements, including improving cover and drainage of the shallow refuse lift at the north-west edge of Module"I" should decrease the potential for water percolation in that area. VOCs VOCs were reported in the four monitoring wells this year. One was reported for the first semester, nine were reported in the second semester. In all instances, the constituents were also i found in one or more quality control blanks and are therefore "false positives". Re-sampling was not required this year. iAt MW-3, VOCs have not been detected since October 2001. Surface Water Surface water samples were not obtained when attempted this year. Water was present,but not iflowing at those times. Further attempts will be made to sample surface water when conditions permit. HISTORICAL TIME SERIES PLOTS Historical Time Series Plots are presented in Appendix F. Note that constituents not detected are plotted at a value of half their respective detection limits. Outliers were included in the plots as directed by RWQCB staff. i s Foothill Sanitary Landfill g Department of Public Works/Solid Waste i2ND Semester/Annual 2003 Groundwater Monitoring County of San Joaquin-January 30,2004