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Foothill Sanitary Landfill 11 Department of Public Works/Solid Waste <br />First Semiannual 2025 Groundwater Monitoring ©2025 County of San Joaquin. All rights reserved. <br /> <br />Leachate samples are analyzed for the following COCs every 5 years: <br /> Inorganics (dissolved)  Semi-Volatile Organic Compounds <br /> VOCs (extended list)  Chlorophenoxy Herbicides <br /> Organophosphorus <br />Compounds <br /> <br />Leachate samples were analyzed for COCs during second semiannual period of 2024 <br />monitoring event. The next monitoring event for leachate COCs will occur during the second <br />semiannual period of 2029.