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Groundwater is monitored semi-annually in accordance with the waste discharge permit <br />requirements Gro 'nd , +ern li+" icy men'+o .d with one un r ,d'e + and fi o ,do r rlion+ <br />we'16. The Site I—prevement 4 of 2006 ie in+enid e'd to inolu,de one a drli+ional up nr die-P,t <br />The groundwater at the Foothill Landfill does not appear to be impacted by the landfill at this <br />time (Fks-Second Semester 200095 Groundwater and Surface Monitoring Report San Joaquin <br />County)..- ,jure -2005). Groundwater ms r- GROtOFed un aocor.danne wath the waste do .� h�..e n--e_r-i <br />nts. The qFeundwateF es sampled se <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 #ave-beeawere ascribed to impact by LFG due to ponding along a road on <br />refuse immediately adjacent to well MW -3 during the winters of 1995/1996 1996/1997 and <br />1997/1998. Impact to groundwater was not indicated at other wells This ponding had been <br />corrected prior 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)mn ewater since <br />October 2002. <br />Foothill Sanitary Landfill Page 91 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />