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® MW-5: No general water quality parameter concentration limits where limits could be determined were exceeded in MW-5 during the first or second semester 2012 sampling events with the exception of Turbidity, which was exceeded during the first semester 2012 sampling event. Two VOCs (CFC-12 and PCE) were detected in MW-5 during the first and second semester 2012 Sampling events MW-5 was installed between the sewage treatment ponds from the migrant labor camp and the landfill 2 portion of the site to determine if the treatment ponds were contributing constituents to groundwater. MW-6 was installed upgradient of the treatment ponds. A review of the general chemical constituents on Table 1 indicate that the treatment ponds appear to act as source of constituents to groundwater. In general, several constituents are lower in background well MW-6, then rise in well MW-5, and then fall in well MW-4. This is illustrated below: Monitoring Wells Constituent MW-6 MW-5 MW-4 (Newly installed (Newly installed (downgradient) upgradient) South of ponds North of MW-4) ® EC (us/cm) 1,011 1,061 854.8 Calcium (mg/L) 22 94 55 Magnesium (mg/L) 9.8 52 29 Alkalinity 100 390 140 (as CaCO3, mg/L) Hardness 94 450 260 (as CaCO3, mg/L) MW-6: MW-6 was installed upgradient of all landfill portions of the site to determine background alkalinity levels. A review of the alkalinity levels indicates that with the exception of well MW-5 the other wells generally fall within the same range as -6 and MW-1 the background wells (Table 1). No general water quality parameter concentration limits where limits could be determined were exceeded in MW-6 during the first or second semester 2012 sampling events. No VOCs were observed in MW-6 during the first or second semester 2012 sampling events. Harney Lane Sanitary Landfill 12 Department of Public Works/Solid Waste 2nd Semester and Annual 2012 Groundwater Monitoring Report County of San Joaquin—January 25,2013