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4 California egional Water Quality Coltol. Board <br /> Central Valley Region <br /> Karl E. Longley,ScD,P.E.,Chair <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 9567 Arnold <br /> 'Tf <br /> Secreta or nr� Schwarzene er <br /> Phone(916)464-3291 •FAX(916)464-4645 l gg <br /> Environmental http://www.waterboards.ca.gov/centralvalley Governor <br /> Protection <br /> l tron V <br /> � f 042009 <br /> 009 <br /> 2 February 2009 <br /> NOTICE <br /> TENTATIVE REVISED WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> POST-CLOSURE MAINTENANCE AND CORRECTIVE ACTION <br /> SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br /> HARNEY LANE LANDFILL <br /> CLASS III LANDFILL <br /> SAN JOAQUIN COUNTY <br /> TO ALL CONCERNED PERSONS AND AGENCIES: <br /> The Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) will consider adopting revised waste discharge requirements (WDRs) for the <br /> Harney Lane Landfill at its meeting on 23 and 24 April 2009. The landfill operated <br /> from 1948 to 1991, accepting primarily household wastes. The landfill includes two <br /> unlined units, Landfill 1 (97-acres) and Landfill 2 (15-acres). In 1994, both units were <br /> closed with a low permeability clay cover, as required under California Code of <br /> Regulations (CCR), title 27. Closure was also intended as a corrective action measure <br /> to address historical groundwater impacts from the landfill, including low concentrations <br /> of volatile organic compounds (VOCs) and elevated general minerals. A landfill gas <br /> (LFG) extraction system was subsequently installed in 1996 as an additional corrective <br /> action measure. <br /> Monitoring data since landfill closure has not indicated any clear decline in groundwater <br /> impacts, although a decline in some VOC concentrations during the past year may be <br /> attributable to improved LFG control. Two VOCs, tetrachloroethane (PCE, 0.5 pg/L) <br /> and benzene (0.7 pg/L) continue to be detected above their California Public Health <br /> Goals (0.06 pg/L and 0.15 pg/L), but are below Drinking Water Standard maximum <br /> contaminant levels (MCLs). Elevated concentrations of general minerals, including <br /> chloride (120 mg/L) and total dissolved solids (TDS, 510 mg/L), also continue to be <br /> detected in groundwater. <br /> The proposed WDRs prescribe updated requirements for postclosure maintenance and <br /> corrective action monitoring. To improve background monitoring, the WDRs require <br /> that the Discharger submit (by 15 June 2009) a workplan for installation of additional <br /> background wells at the site. The WDRs also require that (by 3.0 July 2009) the <br /> Discharger submit for approval an updated postclosure maintenance plan, including <br /> updated cost estimates for postclosure maintenance and corrective action financial <br /> assurances. The WDRs require that the Discharger provide the mechanism for these <br /> assurances to the CIWMB in accordance with title 27 regulations. The monitoring and <br /> California Environmental Protection Agency <br /> 0 Recycled Paper_ _ <br />