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Corral Hollow Sanitary Landfill -3- 2011 San Joaquin County Department of Public Works California Department of Transportation Groundwater Release 9. As discussed above, groundwater monitoring wells MW-5 and MW-8 continue to contain VOCs, including tetrachloroethene ("PCE"), at concentrations over the Public Health Goal of 0.06 pg/L and the Title 27 Water Quality Protection Standard of non-detect. VOCs have been detected in well MW-5 since 1991, and although the number of compounds reported has decreased since corrective action has been implemented, ten VOC compounds were reported in well MW-5 during the fourth quarter2010 groundwater monitoring event. 10.In accordance with Title 27, section 20385, Central Valley'Water.Board staff required the County prepare an Evaluation Monitoring Program ("EMP") work,pian to define the nature and extent of the release from the WMUs and to design a corrective action program meeting the requirements of Title 27, section 204,3,0',.' In a letter dated:,i 1 April 2007, Board staff approved the EMP that the Count y.had submitted. However', the County requested a stay to the EMP in lieu of additional corrective.action. The County stated that LFG was the cause of the continued groundwater impacts�and that additional-extraction wells installed adjacent to the northeastern property boundary would remediate the impacts. 11.Additional LFG extraction wells were installed in 2008 to'a,bate the detected pollution in wells MW-5 and MW-8. However, since the`,additional LFG-,extraction wells have become operational, little effect on groundwaterr mpacts`f ave�been observed in these wells. In a 24 June 2010 letter, the County stated'that the uncovered refuse identified outside the WMU is a likely contributor to":.groundwater.:degradation. The nature and extent of the groundwater plume has not beendefined north-northwest and northeast of the landfill site. Without a':closure cover over the refuse outside the WMU, the LFG collection system can not adequately operate,as a corrective action measure. Regulatory Considerations 12 Water�Code section`1:3267`states, in part: In.conducting an investigation .:> the regional board may require that any person who has discharged, discharges, or is suspected of having discharged or discharging, or who proposed to discharge waste . shall furnish, under penalty of perjury, technical and monitoring program reports which the regional board required. The burden, including costs, of these reports shall bear a reasonable relationship to the need for the report and the benefits to be obtained from the reports. In requiring these reports, the regional board shall provide the person with a written explanation with regard to the need for the reports, and shall identify the evidence that supports requiring that person to provide the reports. The San Joaquin County Department of Public Works owns and maintains the Corral Hollow Sanitary Landfill and is named in WDRs Order 5-01-176. The California Department of Transportation ("Caltrans") owns the adjacent parcel north-northeast of the landfill boundary where refuse has been identified outside the WMU. The technical reports required by this Order are needed by the Central Valley Water Board to ensure compliance with the WDRs, the requirements of Title 27, and the Water Quality Control