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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION 11020 Sun Center Drive, #200, Rancho Cordova, California 95670-6114 TICE OF PUBLIC HEARING concerning TENTATIVE REVISED WASTE DISCHARGE REQUIREMENTS FOR POST-CLOSURE MAINTENANCE AND CORRECTIVE ACTION SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS HARNEY LANE LANDFILL' CLASS III LANDFILL SAN JOAQUIN COUNTY The Harney Lane Landfill is a 112-acre closed landfill approximately six miles east of Lodi. The unlined landfill operated from 1948 to 1991, accepting primarily household wastes. In 1994, the landfill was closed (i.e., capped and graded) with a low permeability clay cover, as . required under California Code of Regulations (CCR), title 27. Closure was also intended as a corrective action to address volatile organic compounds (VOCs) and elevated general minerals groundwater impacts from the landfill. A landfill gas (LFG) extraction system was installed at the site in 1996 as an additional corrective action measure. Two VOCs, tetrachloroethene (PCE, 0.5 pg/L) and benzene (0.7 pg/L), remain above water quality goals, but are below Drinking Water Standard maximum contaminant levels (MCLs). Elevated concentrations of general minerals, including chloride (120 mg/L) and total dissolved solids (TDS, 610 mg/L) also continue to be detected in groundwater. Surface drainage at the site is to South Paddy Creek, tributary to the San Joaquin River. The proposed WDRs prescribe updated requirements for postclosure maintenance and corrective action monitoring. The monitoring and reporting program requires semiannual groundwater monitoring for most parameters. Further information about the facility and the proposed requirements can be found in the Findings and the Information Sheet of the tentative WDRs that are available on the Regional Water Board's website at: www.waterboards.ca.gov/centraIvaIley/board—decisions/tentative—ordeeS. A public hearing concerning this matter will be held during the Regional Water Board meeting, which is scheduled for: DATE: 23 and 24 April 2009 TIME: 8:30 A.M. PLACE: Regional Water Quality Control Board, Central Valley Region 11020 Sun Center Drive #200 Rancho Cordova, CA The designated parties for this hearing are as follows: • Staff of the Central Valley Regional Water Board • San Joaquin County Department of Public Works Only designated parties will have these rights: to call and examine witnesses; to introduce exhibits; to cross-examine opposing witnesses; to impeach any witness; and to rebut the