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<br />North County Recycling Center & Sanitary Landfill Public Works/Solid Waste <br />First Semiannual 2024 Groundwater Monitoring 6 ©2024 COUNTY of San Joaquin. All Rights Reserved. <br /> <br />Groundwater samples are analyzed every 5 years for the following additional constituents of <br />concern (COC): <br /> Semi-volatile Organic Compounds Dissolved Metals <br /> Organophosphorus Pesticides Chlorinated Herbicides <br /> Organochlorine Pesticides Polychlorinated Biphenyls (PCB) <br /> <br />The 5-year COCs were last collected during 2023. The next 5-year COC monitoring event will <br />occur in the first semiannual period of 2028. <br />Storm Water <br />Storm water discharge and run on are monitored in compliance with the Industrial General Permit <br />and WDR of NCRC&SL. Discharges at these points are through culverts, with the discharge <br />controlled by valves. Storm water flows are monitored semiannually for the same field and <br />monitoring parameters as for groundwater specified above. <br /> <br />Surface Water <br />Surface water is sampled semiannually during the first and third quarters at upstream monitoring <br />point S-1 and downstream monitoring point S-2 (Figure 3) when water is flowing. Surface water <br />flows are monitored for the same field and monitoring parameters as for groundwater specified <br />above. <br />Unsaturated Zone <br />The unsaturated zone monitoring network consists of one (1) background monitoring station <br />VZ-1 and ten (10) points of compliance detection stations, VZ-2 through VZ-8 and VZ-11 through <br />VZ-13 (Figure 3). These stations monitor for a potential leachate leak through the landfill liner of <br />Areas 1, 3 and 4. <br />Landfill gas samples are analyzed for temperature, gas pressure, methane, and carbon dioxide <br />quarterly and for VOCs semiannually. VOC analysis was completed during this semiannual <br />period on SG-1D, SG-3D, and SG-6 (Table 6 and Appendix G). <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 field <br />and monitoring parameters as for groundwater specified above. <br />WATER QUALITY PROTECTION STANDARD <br /> <br />The Water Quality Protection Standard (WQPS) for groundwater consists of the COCs, the <br />Concentration Limits (CLs) for each COC, the Point of Compliance (POC, and related <br />groundwater monitoring wells), and the Compliance Period. <br />Constituents of Concern <br />The COCs include all the waste constituents, their reaction products, and hazardous <br />constituents that are reasonably expected to be in or derived from waste contained in the landfill.