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Samples collected from the leachate sumps are analyzed for the following parameters semiannually: <br /> ® Temperature Total Alkalinity <br /> Electrical Conductivity(EC) Total Hardness <br /> pH Chemical Oxygen Demand(COD) <br /> Turbidity Volatile Organic Compounds (Short List) <br /> Dissolved Oxygen(DO) Chloride <br /> Redox Potential Total Dissolved Solids (TDS) <br /> Statistical Analysis of Groundwater Data <br /> The NCRC&SL has been approved to perform interwell tolerance limits (up-gradient well serves as the <br /> background). Concentration limits are updated once yearly using interwell tolerance limit methods, and <br /> were most recently updated for the first semester of 2013. Analytical results from this monitoring event <br /> were compared to the concentration limits. <br /> Concentration limits are updated where possible. If the historical data contains more than 50%non- <br /> detects,the concentration limit cannot be updated. In these cases,the established concentration limit <br /> listed in the WDRs is used for comparison. <br /> Concentration limits are updated on a yearly basis in accordance with the latest WDRs. As requested by <br /> RWQCB staff, stiff diagrams will be included in the second semester and annual report. <br /> Landfill Gas Collection System <br /> The landfill gas (LFG) collection system was installed in 2006. It consists of seven vertical wells, and is <br /> also attached to the LCRS at two locations. The system is operated in accordance with the Permit to <br /> Operate issued by the San Joaquin Valley Unified Air Quality Management District. <br /> MONITORING RESULTS <br /> Groundwater <br /> Summary <br /> Groundwater was sampled on January 23, 2013. <br /> Field and Monitoring Parameters <br /> Monitoring results for the first semester sampling event of the l t Quarter on January 23, 2013 (Table 3) <br /> indicate that the concentrations of field and monitoring parameters are below established concentration <br /> limits where limits could be established for all wells, with the exception of well G-1 where a slight <br /> exceedence for Sodium was reported. This is the "background" well; therefore, this data indicates <br /> conditions beyond the landfill rather than impact to groundwater by our landfill. Groundwater <br /> elevations for the 2nd quarter 2013 show similar results (Table 4). <br /> North County RC&SL Public Works/Solid Waste <br /> 1S`Semester 2013 Groundwater Monitoring 6 County of San Joaquin—July 25,2013 <br />