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l <br /> Storm Water <br /> Storm water is collected from six (6) sampling points (SW-1 — SW-6) as identified in the WDR. <br /> Discharges at these points are through culverts, with the discharge controlled by valves. <br /> Storm water flows are monitored semiannually for the same field and monitoring parameters <br /> as for groundwater specified above. There were no discharges during this monitoring period <br /> due to lack of rainfall. <br /> Surface Water <br /> Surface water is sampled at upstream monitoring point S-1 and downstream monitoring point <br /> S-2 (Figure 3) when water is present. Samples are collected after the first storm of the rainy <br /> season that produces significant flow, and quarterly thereafter when water is present. Surface <br /> water flows are monitored semiannually for the same field and monitoring parameters as for <br /> groundwater specified above. No sampling was conducted during this monitoring period due <br /> to absence of water. <br /> Unsaturated ZoneL simeters <br /> LY ) <br /> The unsaturated zone monitoring network consists of one (1) background monitoring station <br /> VZ-1 and seven (7) points of compliance detection stations, VZ-2 through VZ-8 (Figure 3). <br /> These stations monitor for a potential leachate leak through the landfill liner of Areas 1, 3 and <br /> 4. <br /> Landfill gas samples are analyzed for Temperature, Gas Pressure, Methane, and Carbon <br /> Dioxide quarterly and for VOC's semiannually. VOC analysis was done during this semiannual <br /> period (Table 4). <br /> VOCs will also be monitored in any perimeter migration monitoring well in which the methane <br /> concentration exceeds 5% by volume. <br /> Leachate <br /> Leachate at each sump is monitored monthly for volume of leachate collected, pump flow rate, <br /> pH, and electrical conductivity.Leachate samples are monitored semiannually for the same <br /> field and monitoring parameters as for groundwater specified above. <br /> Statistical Analysis of Groundwater Data <br /> The NCRC&SL has been approved to perform interwell tolerance limits (up-gradient well <br /> serves as the background). Concentration limits are updated once yearly using interwell <br /> North County RC&SL Public Works/Solid Waste <br /> I"Semiannual 2014 Groundwater Monitoring 4 County of San Joaquin—July 31,2014 <br />