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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION 3443 Routier Road,Suite A,Sacramento,California 95827 PUBLIC HEARING Concerning Consideration of the Revision of WASTE DISCHARGER REQUIREMENTS FO SAN JOAQUIN COUNTY FOR POST-CLOSURE AND CORRECTIVE ACTION MONITORING CORRAL HOLLOW SANITARY LANDFILL, MUNICIPAL SOLID WASTE LANDFILL FACILITY SAN JOAQUIN COUNTY The County of San Joaquin(hereafter referred to as Discharger) owns and operates a closed municipal solid waste landfill five miles south of Tracy, near Corral Hollow Creek. The Board adopted Waste Discharge Requirements (WDRs)No. 94-259 on 16 September 1994 for the closure and post-closure maintenance of the Corral Hollow Sanitary Landfill. The facility has been closed since 1995. Volatile organic compounds (VOCs) have been present in one shallow groundwater monitoring well and concentrations have been increasing. The shallow groundwater is only present beneath the northeastern portion of the landfill. Landfill gas beneath the site contains similar VOCs as found in the shallow groundwater. A deeper aquifer underlies the entire facility,but wells formerly monitoring the deeper water quality have been dry during the last ten years, so no subsurface monitoring has occurred beneath the southwestern half of the landfill. The proposed revision to the WDRs recognizes that the Dischargers are installing a landfill gas extraction and collection system. The county has proposed the extraction of landfill gas as a corrective action program for the VOCs in shallow groundwater. The WDRs are being updated to reflect that the site is in post-closure maintenance including corrective action for groundwater and landfill gas, and that concentration limits for groundwater corrective action are being developed. Additionally, the proposed revised requirements also require the county to propose adequate subsurface monitoring for the southwestern half of the landfill. A formal public hearing concerning this matter will be held during the Regional Board meeting which is scheduled for: DATE: 14 June 2001 TIME: 9:00 a.m. PLACE: Regional Water Quality Control Board, Meeting Room 3443 Routier Road, Suite A Sacramento, California 95827 The hearing will not be conducted according to the technical rules of evidence, but evidence is presented by sworn testimony and staff and designated parties providing testimony are subject to cross examination. The Board will accept any evidence or testimony that is reasonably relevant.