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� T <br /> Q) DOYERNOG <br /> CA CIFOWNIA MATTHEW RODRIODEZ <br /> '$Q'. <br /> e er Boards <br /> ENVIROgMv IOP <br /> SECRE NMENTq;.PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> RECEIVED <br /> 6 June 2018 JUN 12 2018 <br /> ENVIRONMENTAL HEALTH <br /> Mr. Taj M. Bahadori, PE PERMIUSERKES <br /> Senior Civil Engineer <br /> San Joaquin County Public Works, Solid Waste Division <br /> 1810 E. Hazelton Avenue <br /> Stockton, CA 95201 <br /> NOTICE OF VIOLATION: REVIEW OF THE SECOND SEMESTER AND ANNUAL 2017 <br /> GROUNDWATER AND SURFACE WATER MONITORING REPORT, AND SITE INSPECTION <br /> REPORT FOR FOOTHILL SANITARY LANDFILL, SAN JOAQUIN COUNTY <br /> The Foothill Sanitary Landfill is owned by San Joaquin County and operated by Foothill Sanitary <br /> Landfill, Inc. The Foothill Sanitary Landfill is regulated by Waste Discharge Requirements <br /> (WDRs) Order R5-2015-0058. Central Valley Water Board staff has reviewed the Second <br /> Semester and Annual 2016 Groundwater and Surface Water Monitoring Report for the Foothill <br /> Sanitary Landfill. <br /> Unsaturated Zone Violations <br /> Nine of ten alternate boundary gas probes reported detections of VOCs during 2017. <br /> Furthermore, methane continues to be detected in probe SG-1 (1ST Semester 2017), which <br /> monitors the vadose zone at a depth of 255 feet below ground surface. Landfill gas and VOCs <br /> continue to be detected in the vadose zone and groundwater in the vicinity of SG-1, which is <br /> evidence of LFG migration at depth. These detections indicate a release from the WMU and <br /> are a violation of WDRs Prohibitions A.2, A.4, and A.7. <br /> During July 2016, the Discharger upgraded the alternate boundary soil gas probes. Probes <br /> SG-2A, -3A, -6A, -10A, and -11A were installed as triple completion wells. Single completion <br /> gas probes SG-4, -5, -7, and -9 are left to be reinstalled as triple completion gas probes, per the <br /> approved Revised Engineering Feasibility Study dated 19 December 2014. <br /> Groundwater Violations <br /> Volatile organic compounds (VOCs) have been detected in well MW-3 during the 1St 2nd 31 <br /> and 4th Quarter 2017 monitoring events, which is consistent with past sampling events. <br /> Detections of VOCs in groundwater is evidence of a release from the Unit and is a violation of <br /> WDRs Prohibitions A.2, A.4, and A.7. <br /> The Detection Monitoring Program (DMP) is deficient and requires the Discharger to add an <br /> additional groundwater well at the point of compliance of Module I, to provide additional control <br /> across the site for groundwater flow direction and gradient and to provide additional capability to <br /> detect a release at the earliest possible time from the Unit in accordance with Title 27, section <br /> KARL E. LONOLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E., EICEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboarcis.Ca.gov/Centralvalley <br /> C�,RECYCLED PAPER <br />