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Mr. Chandler Martin - 2 - 2 December 2002 Mitigation Monitoring Action Requirements or Action Number 46 Liner and leachate collection Required by Title 27 and the facility WDRs. system desi2. Separation between liner and Required by Title 27 and the facility WDRs. groundwater. Leak detection system. Required by Title 27 and the facility WDRs. Operations layer over liner. Required by Title 27 and the facility WDRs. Double liner under sump area. Revised facility WDRs will require this. Electrical testing of each Revised facility WDRs will require electrical testing of WMU liner. the liner. RWQCB required changes Title 27 allows changes to prescriptive WMU design if necessary to protect water guality. 47 -Engineering leachate controls Required by Title 27 and the facility WDRs. Leachate monitoring Required by Title 27 and the facility WDRs. Leachate re ortin controls Required by Title 27 and the facility WDRs. RWQCB and DTSC required Title 27 requires that appropriate corrective actions be changes implemented to abate any release that threatens water quality. 48 Desigh for pre-loaded Required by Title 27 and the facility WDRs. settlement Future design of vertical Required by Title 27 and the facility WDRs. expansion Maintain extraction wells The extraction wells are part of corrective actions to remediate groundwater contamination from the old Austin Road WMU. Title 27 and facility WDRs require that the convective actions be maintained and if necessary improved until cleanup goals are achieved. CIWMB and RWQCB review Required by Title 27 and the facility WDRs. vertical expansion design. 49 -Sample off-site wells to east. Required by Title 27 and the facility WDRs. Sample additional off--site Required by Title 27 and the facility WDRs. wells. Extract/treat VOCs in offsite Extraction and treatment of groundwater to remove plume VOCs is part of corrective actions to remediate groundwater contamination from the old Austin Road WMU. Title 27 and facility WDRs require that the corrective actions be continued and if necessary improved until cleanup goals are achieved. 50 Infiltration of treated Infiltration of treated groundwater is part of corrective groundwater. actions to remediate groundwater contamination from the old Austin Road WMU. Title 27 and facility WDRs require that the corrective actions be continued and if necessary improved until cleanup goals are achieved.