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Foothill Sanitary Landfill Page 48 of 53 San Joaquin County DPW - Solid Waste Joint Technical Document Revised 6/09/2020 7.15. Surface Water Surface water is monitored at “upstream” and “downstream” locations in the seasonal creek when water is flowing, in accordance with the WDRs (Figure 2). Quality of surface water is maintained by maximizing retention of rain water on the site, thereby minimizing particulates contributed to the creek. The land east of the seasonal creek also drains into the creek. This land is grazed, such that manure from those cattle could contribute to the quality of the surface water. Impact to surface water is not indicated by monitoring data. Storm water quality is controlled by preventing contact with refuse. 7.16. Leachate Control Leachate is water that comes in contact with waste. Leachate is primarily a result of infiltrating rain water, although some moisture is released through waste decomposition and consolidation of the waste mass. Leachate from MSW is a mixture of soluble organic and inorganic constituents, suspended solids, and bacteriological constituents. In general, the rate of leachate generation at a landfill in a semi-arid climate such as Eastern San Joaquin County is highest early in the operating life of the facility. At the Foothill Sanitary Landfill, contributions of moisture from outside sources to the waste mass is limited because: • Surface water management consists of diverting surface water run-on away from active areas of the landfill. • Daily cover is placed which limits infiltration of precipitation that falls directly onto the landfill. • A final cover will be constructed over all fill areas which will minimize infiltration into the waste mass. Landfill staff periodically inspects the cover on filled modules for low spots that could allow for ponding water and make repairs as necessary. LF-1 does not have a leachate collection and recovery system. Module 1 and all future modules will include a leachate collection and recovery systems (LCRSs).