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s CENTRAL VA Y REGIONAL WATER QUALITY CCN1'ROL BOARD <br /> INSPECTION <br /> 1 February 2017 <br /> DISCHARGER: Cove Contractors Landfill <br /> LOCATION &COUNTY: 3242 EI Dorado Street, Stockton <br /> CONTACT(S): Andrew Keller(TLE Properties) <br /> INSPECTION DATE: 6 January 2017 <br /> INSPECTED BY: Brendan Kenny <br /> ACCOMPANIED BY: Rick Marty (Advanced eoEnvironmental) <br /> INTRODUCTION: <br /> Post-closure maintenance and monitoring of the Cove Contractors Landfill is regulated by Waste <br /> Discharge Requirements Order R5-2007-0084. Cove Contractors, Inc. and EI Dorado Property <br /> Management own the landfill and are referred to as Discharger. The landfill is a closed, unlined landfill <br /> that previously accepted auto shredder waste and construction debris. The landfill was capped with a <br /> prescriptive cover in 2007. Groundwater beneath the landfill has been impacted by the release of <br /> petroleum hydrocarbons, metals and volatile organic compounds from the landfill. The Discharger has <br /> installed a landfill gas extraction system and groundwater extraction system to address groundwater <br /> impacts. The landfill gas system consists of sixteen passive landfill gas vents and four gas extraction <br /> wells connected to a soil vapor extraction system. The groundwater extraction system consists of four <br /> dewatering,wells and is designed to extract water that is in contact with waste in the landfill. Extracted <br /> water is treated in carbon vessels prior to being discharged to the City of Stockton Municipal Utility <br /> District for disposal. <br /> OBSERVATIONS AND COMMENTS: <br /> The facility is fenced to prevent public access. Vegetation on the landfill cover consists of a mix of <br /> native grasses and weeds. No erosion of the landfill cover was observed. Some areas of ponded <br /> water were observed on the south, south-east section of the cover(Figures 1, 2, 4 and 5). The <br /> groundwater monitoring wells were locked (Figure ). The soil vapor gas extraction system (figure 10) <br /> was operational and staff observed negative pressure at extraction wells MV7 and MV10. The <br /> dewatering system was not operating at the time of inspection. According to the Discharger's <br /> consultant, operation of the system ceased due to effluent exceedances of tertbutyl alcohol from the <br /> treatment system. The Discharger is currently evaluating additional treatment options so that <br /> dewatering can resume. <br /> CONCLUSIONS/RECOMMENDATIONS: <br /> Most of the landfill cover appeared to be in good condition. However, the areas of settlement where <br /> ponded water was observed should be addressed (graded and re-vegetated) prior to next rainy <br /> season. Staff will address the operation of the groundwater extraction system in separate <br /> correspondence. <br /> Brendan Kenny, Engineering Geologist <br /> Approved: CIWQS Inspection ID 28439657 <br />