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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2014-0006 -15- FORWARD INC.AND REPUBLIC SERVICES INC. FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY a. Enhance landfill gas control system to prevent further release of VOCs from the landfill; b. Continued groundwater extraction and treatment with existing extraction wells; c. Implementation of a groundwater artificial recharge system using treated water; d. Additional groundwater monitoring wells to monitor the effectiveness of the corrective action and determination of the need for modifications; and e. Install an interim cover on Austin Road Landfill Unit 1. 59.The groundwater extraction system consists of five groundwater extraction wells at the downgradient boundary of the Austin Road Unit. VOCs are removed with an air stripper and the treated water is discharged to a recharge basin to recharge the shallow aquifer. Operation and monitoring of the groundwater extraction system is regulated by Order R5- 2003-0080. 60.In 2008, chlorinated solvents including tetrachloroethylene and trichloroethylene were detected in water supply wells at the California Youth Authority (CYA) facility, approximately 1900 feet north of the Austin Road Unit. On 8 December 2008, the Executive Officer issued Cleanup and Abatement Order (CAO) R5-2008-0714 requiring among other things a plan to supply drinking water to the CYA, a source control plan, upgrade the existing groundwater treatment system, investigate the nature and extent of the release, submit an engineering feasibility study, and implement corrective actions. Compliance with the CAO is ongoing, the Discharger extended the municipal water supply to CYA and is currently working on the 0 nature and extent investigation. Any corrective actions resulting from the CAO will be addressed in a future Order. LINER PERFORMANCE DEMONSTRATION 61.On 15 September 2000 the Central Valley Water Board adopted Resolution No. 5-00-213 Request For The State Water Resources Control Board To Review The Adequacy Of The Prescriptive Design Requirements For Landfill Waste Containment Systems To Meet The Performance Standards Of Title 27. The State Water Board responded, in part, that "a single composite liner system continues to be an adequate minimum standard" however, the Central Valley Water Board "should require a more stringent design in a case where it determines that the minimum design will not provide adequate protection to a given body of groundwater." In a letter dated 17 April 2001, the Executive Officer notified Owners and Operators of Solid Waste Landfills that "the Board will require a demonstration that any proposed landfill liner system to be constructed after 1 January 2002 will comply with Title 27 performance standards. A thorough evaluation of site-specific factors and cost/benefit analysis of single, double, and triple composite liners will likely be necessary." 62.On 21 February 2002, the Discharger submitted "Leachate Attenuation Analyses Prescriptive Clay Liner, Forward Landfill" and on 21 March staff provided comments for that document. ® On 10 July 2002 the discharger submitted "Performance Demonstration for a Single Composite Liner", and on 14 August 2002 staff provided comments for that document. On