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California Regional Water QualityTontrol Board Central Valley Region Robert Schneider,Chair Winston H.Hickox Gray Davis Secretaryfor Sacramento Main Office Governor Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 2 March 2001 Mr. Michael Kalish County of San Joaquin Department of Public Works P.O. Box 1810 Stockton, CA 95201 EVALUATIONOFEXTENT OF VOCIMPACTS TO SH,4LL0W G'ROUNDWATE'R AND PROPOSED CORRECTIVE ACTION, CORRAL HOLL 0 WSANITARYLANDFILL,SAN JOAQUIIV COUNTY(CASENO. 1896) In August of 2000, San Joaquin County submitted a report that supports the county's interpretation that concentrations of volatile organic compounds (VOCs) detected in groundwater monitoring well MW-5 are associated with diffusion of VOCs from landfill gas. Consultants for the county sampled landfill gas emissions along the northern boundary of the landfill and found significant amounts of methane and VOCs. The county is in the process of installing a landfill gas collection system to mitigate the methane emissions. The county has also proposed this system as a corrective action to reduce the VOC concentrations detected in MW-5. You have indicated that the system should be operational during Spring 2001. Implementation of a corrective action measure necessitates Board approval of a Report of Waste Discharge (ROWD) update. In compliance with Title 27, California Code of Regulations, § 20425(d)(2), the minimum ROWD update shall include delineation of the release, a proposed Water Standard, detailed description of the corrective action measures, and a plan for a water quality monitoring program that will demonstrate the effectiveness of the proposed corrective action. The county should submit the appropriate documents including details of the landfill gas system design and proposed operation, a schedule for implementation of the corrective action as a Joint Technical Document (accompanied by the appropriate JTD checklist). Documents already submitted to the Regional board need not be resubmitted, but should be referred to and included in the checklist if the county considers them part of the ROWD JTD. The submittal should also be accompanied by the"Joint Permit Application Form"included as Appendix 1 of Title 27. Please submit the requested ROWD package by 23 March 2001. Regional Board staff will incorporate the information provided by the County in revised Waste Discharge Requirements (WDRs) for Corral Hollow Landfill. The county will be provided with a "Tentative" draft of the WDRs on 16 April 2001. The Regional Board will complete public notification prior to adoption of the updated WDRs. We anticipate that the Board will adopt the update during the meeting scheduled for 14 June 2001. California Environmental Protection Agency ea Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5