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Leachate System Monitoring and Maintenance The flow rate provided by the sump pump is tested at least monthly. If no other causes are apparent, then a decrease in pumping rate will indicate the need to clean a filter or to investigate pump wear. Leachate production rate isgspring,reater in the late winter and compared to summer and autumn because p little or no rain falls on the site from April to November of each year. The secondary leachate sump is monitored monthly for the removal of LFG condensate Landfill Gas Condensate Removal from Area 1 Secondary Sump The pump permanently installed in the secondary sump under Area 1 operates once three days per week, pumping liquid, if any, from the secondary sump into the primary sump. Once started, the pump operates until pump protection circuits stop pumping due to insufficient liquid. A meter is provided to monitor the liquid removed. The depth of liquid in the secondary sump is also monitored monthly using by a bubbler tube installed into the sump. Measurements indicate that the pump is maintaining the liquid level at the minimum level that allows the pump to remove liquid. ANNUAL SUMMARY ' Groundwater General Water Quality Parameters MW-4 was located directly up-gradient of the landfill based on groundwater elevations from the previously- installed wells. This well has been sampled sixteen times since installation. Concentration limits have been established based on Sanitas software calculations using data for MW-4. ' The following annual compliance review was prepared for each well: 1 • Well MW-1: Well MW-1 was not sampled during the 1St or 2nd Semester 2013 due to a lack of water required for Sampling. • Well MW-IA: Well MW-A is a replacement well that was installed prior to the 2"d Semester 2013 sampling event. Sodium was recorded at 30 mg/L which exceeded the tolerance limit of 17 mg/L, Chloride was recorded at 110 mg/L which exceeded the tolerance limit of 13 mg/L, and Sulfate was recorded at 16 mg/L which slightly exceeded the tolerance limit of 15 mg/L during the 2"d Semester 2013 sampling event. • Well MW-2R: No General water quality parameters were exceeded during the 1St and 2nd ' semester 2013 sampling events. • Well MW-3: Bicarbonate Alkalinity was recorded at 140 mg/L which slightly exceeded the tolerance limit of 130 mg/L during the 1St and 2nd Semester 2013 sampling events. No other ' General water quality parameters were exceeded during either the 1St or 2nd semester 2013 sampling events. • Well MW-4: No General water quality parameters were exceeded during the 1St and 2"d semester 2013 sampling events. • Well MW-5: No General water quality parameters were exceeded during either the 1St or 2nd semester 2013 sampling events. Foothill Sanitary Landfill 11 Department of Public Works/Solid Waste ' 2°d Semester and Annual 2013 Groundwater Monitoring County of San Joaquin—January 31,2014