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Foothill Sanitary Landfill Page 47 of 52 San Joaquin County DPW - Solid Waste Joint Technical Document Revised 12/04/2025 monitoring well MW-3. There have been sporadic VOC detections at MW-3 since. However, at the latest monitoring event for the first quarter of 2020, no VOCs were detected at MW-3. The remaining wells have always been non-detect for VOCs. 7.14. Storm Water Storm water is monitored from storm water discharge points when a discharge occurs, in accordance the NPDES requirements (Figure 2). The landfill’s storm water sampling plan conforms to the site’s NPDES permit and Storm water Pollution Protection Plan (Appendix J). Each year the landfill submits an Annual Storm Water Protection Report to the RWQCB. Because of the porosity of the soils and the semi-arid environment, often the annual rainfall does not result in a storm water discharge. Quality of storm water is controlled by preventing contact with refuse. 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 rainwater 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 rainwater, 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.