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0 7.15. Surface Water <br />Surface water is monitored at "upstream" and "downstream" locations in the seasonal creek <br />when water is flowing, in accordance with the WDRs (Figure 2). Quality of surface water is <br />maintained by maximizing retention of rain water on the site, thereby minimizing particulates etc <br />contributed to the creek. The land ease 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. <br />Impact to surface water is not indicated by monitoring data. <br />Storm water quality is controlled by preventing contact with refuse. <br />7.16. Leachate Control <br />Leachate is water that comes in contact with waste. Leachate is primarily a result of infiltrating <br />rain water, although some moisture is released through waste decomposition and consolidation <br />of the waste mass. Leachate from MSW is a mixture of soluble organic and inorganic <br />constituents, suspended solids, and bacteriological constituents. <br />The quantity of leachate generated in MSW landfills is dependent on: <br />• Infiltration <br />• Surface water run-on <br />• Evapotranspiration <br />• Final cover design <br />• Waste field capacity <br />• Waste compression <br />• Age of the site <br />Foothill Sanitary Landfill Page 51 of 57 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />