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CaliforPRegional Water Quality Ctotrol Board <br /> Central Valley Region <br /> Linda S.Adams Arnold <br /> Secretaryjor Sacramento Main Office Schwarzenegger <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Governor <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 <br /> http://www.waterboards.ca.gov/centralvalley <br /> 9 January 2007 <br /> W. Michael Carroll <br /> San Joaquin County Dept. of Public Works <br /> Solid Waste Division <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> ESTIMATE OF CORRECTIVE ACTION COSTS FOR CORRAL HOLLOW SANITARY <br /> LANDFILL, HARNEY LANE SANITARY LANDFILL, FOOTHILL SANITARY LANDFILL, <br /> AND NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL <br /> The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the <br /> Estimate of Corrective Action Costs for the four San Joaquin County (County) owned landfills. <br /> Estimate of Corrective Action Costs is required under Title 27, Sections 20380(b) and Sections <br /> 22220-22222. Please review staff's comments below for each of the four County owned <br /> landfills. <br /> Corral Hollow Sanitary Landfill <br /> Corral Hollow Sanitary Landfill is a closed unlined landfill that has not received waste since <br /> 1991. The landfill closed in 1995 and San Joaquin County initiated corrective action in <br /> December 2001 to mitigate offsite landfill gas migration and impacts to groundwater by volatile <br /> organic compounds (VOCs). VOCs continue to be detected in groundwater and landfill gas <br /> has not been delineated north-northeast of the closed waste management unit (WMU). San <br /> Joaquin County's "Hypothetical Release Scenario" includes landfill gas escaping from the <br /> bottom of the landfill that migrates to groundwater resulting in low level VOC impacts. San <br /> Joaquin County has proposed as a corrective action to mitigate a "reasonably foreseeable <br /> release" the installation of seven (7) vent wells fitted with a one-way valve and wind turbine. <br /> There is no proposal to remediate the groundwater impacts. The estimated cost for this <br /> proposed corrective action is $49,000.00. <br /> Staff believes the hypothetical release scenario is insufficient to address the range and <br /> complexity of a "reasonably foreseeable release" that is possible and probably likely at this <br /> site. Staff also disagrees that the proposed corrective action is consistent with the types and <br /> magnitude of corrective action commonly mandated by the Regional Water Board. San <br /> Joaquin County should reevaluate the hypothetical release scenario and corrective action to <br /> include costs associated with possible horizontal and vertical delineation of a landfill gas <br /> plume north, south, east, and west of the WMU, installation of gas extraction wells and <br /> infrastructure to support additional wells, and the installation of a groundwater pump and treat <br /> California Environmental Protection Agency <br /> zZa�Recycled Paper <br />