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Foothill Sanitary Landfill 20 Department of Public Works/Solid Waste <br />First Semiannual 2025 Groundwater Monitoring ©2025 County of San Joaquin. All rights reserved. <br /> <br />9.0 RUN-OFF/RUN-ON FACILITIES <br />The FSL utilizes several methods to control run-on and run-off. The natural topography of the <br />area controls any run-on into the landfill area. In addition, the working area is approximately <br />1,100 feet from the property boundary and at a higher elevation, so run-on from surrounding <br />properties into refuse is not possible. <br />To control run-off, a perimeter ditch along the north, west, and east ends of the landfill area <br />directs all storm water run-off into a sedimentation basin on the east side of the landfill. The rest <br />of the run-off from the landfill area gathers into a sedimentation basin at the south of Module 2B. <br />There were no breaches to any of the run-on/run-off facilities during this monitoring period. Minor <br />modifications to the runoff area were completed to install a silt fence to keep California Tiger <br />Salamanders out of the area.