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<br /> <br />Foothill Sanitary Landfill Page 47 of 52 San Joaquin County DPW - Solid Waste <br />Joint Technical Document Revised 01/05/2026 <br /> <br /> <br />Because of the porosity of the soils and the semi-arid environment, often the annual <br />rainfall does not result in a storm water discharge. Quality of storm water is controlled by <br />preventing contact with refuse. <br /> <br />7.15. Surface Water <br />Surface water is monitored at “upstream” and “downstream” locations in the seasonal <br />creek when water is flowing, in accordance with the WDRs (Figure 2). Quality of surface water <br />is maintained by maximizing retention of rainwater on the site, thereby minimizing particulates <br />contributed to the creek. The land east of the seasonal creek also drains into the creek. This <br />land is grazed, such that manure from those cattle could contribute to the quality of the surface <br />water. Impact to surface water is not indicated by monitoring data. Storm water quality is <br />controlled by preventing contact with refuse. <br /> <br />7.16. Leachate Control <br />Leachate is water that comes in contact with waste. Leachate is primarily a result of <br />infiltrating rainwater, although some moisture is released through waste decomposition and <br />consolidation of the waste mass. Leachate from MSW is a mixture of soluble organic and <br />inorganic constituents, suspended solids, and bacteriological constituents. <br /> <br />In general, the rate of leachate generation at a landfill in a semi-arid climate such as <br />Eastern San Joaquin County is highest early in the operating life of the facility. <br /> <br />At the Foothill Sanitary Landfill, contributions of moisture from outside sources to the <br />waste mass is limited because: <br /> <br />x Surface water management consists of diverting surface water run-on away from <br />active areas of the landfill. <br />x Daily cover is placed which limits infiltration of precipitation that falls directly onto the <br />landfill. <br />x A final cover will be constructed over all fill areas which will minimize infiltration into <br />the waste mass.