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® The groundwater at the Foothill Landfill does not appear to be impacted by the landfill at this <br />time (Second Semester 2009 Groundwater and Surface Monitoring Report, San Joaquin <br />County). <br />Prior to March 2000, impacts to groundwater were not indicated. From March 2000 to October <br />2001, volatile organic compounds (VOCs) were detected at groundwater monitoring well MW -3. <br />These detections were ascribed to impact by LFG due to ponding along a road on refuse <br />immediately adjacent to well MW -3 during the winters of 1995/1996, 1996/1997, and 1997/1998. <br />Impact to groundwater was not indicated at other wells. This ponding had been corrected prior <br />to the detection of LFG components in the groundwater at MW -3 <br />As a result of the groundwater impact at MW -3, the WDRs required an Evaluation Monitoring <br />Program, which was completed June 2003. Groundwater samples from temporary borings were <br />found free of contaminants. A soil gas well, SG -1, was bored to sample soil gas above the <br />water table near groundwater monitoring well MW -3. Four VOCs were detected in gas samples <br />taken from SG -1; however, these compounds were not detected in the water samples taken at <br />® MW -3. <br />Corrective action taken to prevent ponding has apparently resulted in the elimination of impact <br />by landfill gas, as indicated by lack of confirmed VOC detections above trace concentrations <br />(except for sporadic detections not indicating groundwater contamination) since October 2002. <br />7.14. Storm Water <br />Storm water is monitored from storm water discharge points when the discharge is occurring in <br />accordance the NPDES requirements (Figure 2). The landfill's storm water sampling plan <br />conforms to the site's NPDES permit and Storm water Pollution Protection Plan (Appendix J). <br />Each year the landfill submits an Annual Storm Water Protection Report to the RWQCB. <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 />Foothill Sanitary Landfill Page 50 of 57 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />