Laserfiche WebLink
Linda S. Adams <br />Secrelaryfor <br />Environmental <br />Protection <br />California Regional Water Quality Cont '- Board <br />0 Central Valley Region i <br />9 January 2007 <br />Sacramento Main Office <br />11020 Sun Center Drive #200, Rancho Cordova, California 95670-6114 <br />Phone (916) 464-3291 • FAX (916) 464-4645 <br />http://wxm,.",aterboards.ca.gov/centralvalley <br />W. Michael Carroll <br />San Joaquin County Dept <br />Solid Waste Division <br />P.O. Box 1810 <br />Stockton, CA 95201 <br />of Public Works <br />,,,. <br />Arnold <br />Schwarzenegger <br />Governor <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 />�a Recycled Paper <br />