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Leachate was sampled (collection point L-1, L-3, and L-4)in the second semester of 2012 (Table 6). <br /> The next Leachate sampling event is scheduled for the first semester of 2013 and will be included in the <br /> first semester 2013 report. <br /> Twenty Eight different VOCs were reported in the second semester 2012 leachate sample. The highest <br /> VOC concentrations reported were the Xylenes, MtBE, TBA,Acetone,the benzene compounds, and <br /> Toluene. Results are consistent with past leachate monitoring events. Presence of VOCs in the leachate <br /> do not indicate groundwater contamination, but rather indicate the success of the liners at North County <br /> Landfill in preventing groundwater contamination. <br /> Secondary Sump Monitoring <br /> The liquid level in the secondary sumps of Area 3 and 4 are monitored quarterly. <br /> No liquid was found in either secondary sump since monitoring began in July 2010. This lack of liquid <br /> indicates that the primary liner is not leaking. <br /> Area 1 is not provided with a secondary sump. <br /> ANNUAL SUMMARY <br /> MONITORING <br /> Groundwater <br /> General Water Quality Parameters <br /> G-1 (Up-gradient): <br /> The concentration limits for Turbidity, Potassium, Sodium and Bicarbonate were slightly exceeded in <br /> background well G-1 during the 1St semester 2012 sampling event. All concentrations of field and <br /> monitoring parameters were below established concentration limits in G-1 during the 2nd Semester 2012. <br /> Because G-1 is generally hydraulically up gradient of the landfill,the increased levels of these <br /> constituents during the 1St Semester 2012 could be due to regional changes in water quality that are <br /> unrelated to site activities. All other concentrations of parameters were less than the tolerance limits. <br /> G-31) (Down-gradient): <br /> All concentrations of field and monitoring parameters were below established concentration limits in <br /> G-3D during the 1St and 2nd semesters 2012. <br /> G-4 (Down-gradient): <br /> All concentrations of field and monitoring parameters were below established concentration limits in <br /> G-4 during the 1 st and 2nd semesters 2012. <br /> G-5 (Down-gradient): <br /> North County RC&SL Public Works/Solid Waste <br /> 2"d Semester and Annual 2012 Groundwater Monitoring 10 County of San Joaquin—January 15,2013 <br />