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GEOMATRIX <br /> Geomatrix anticipates the potentially cost-effective remedial alternatives will include no action, <br /> natural attenuation, in-situ bioremediation, groundwater extraction/treatment/injection, and <br /> groundwater extraction/evaporation. The remediation alternatives will be considered and <br /> evaluated based on Comprehensive Environmental Response Compensation and Liability Act <br /> remedial objectives,including cost effectiveness and duration. <br /> 5.3 CORRECTIVE ACTION PROGRAM <br /> Based on the results of the EMP/EFS, Geomatrix will have evaluated the extent and nature of <br /> the dissolved solids release(s),will have evaluated the potentially applicable remediation <br /> alternatives to meet water quality objectives, and will have identified the most cost-effective <br /> alternative. <br /> Assuming Simplot proposes the most cost-effective alternative, Geomatrix will prepare a CAP <br /> described in Simplot's plan. The CAP will be submitted to the RWQCB along with an <br /> amended Report of Waste Discharge(ROWD). The CAP and ROWD will describe the <br /> following: <br /> • groundwater quality objectives of the CAP, <br /> • methods proposed for implementing the CAP, <br /> • criteria proposed for terminating the CAP, and <br /> • methods proposed for ongoing evaluation monitoring. <br /> Since the details of the most cost-effective remediation alternative will not be known until <br /> completion of the EMP, Geomatrix cannot yet describe the details of the CAP. <br /> 5.4 DETECTION MONITORING PROGRAM <br /> Upon completion of the EMP and concurrent with preparation of the EFS (both previously <br /> described), Geomatrix will evaluate the historical and current groundwater monitoring data to <br /> prepare an updated DMP. The DMP will be designed to identify measurably significant <br /> evidence of a current release of dissolved solids to groundwater. The DMP will have to <br /> separate evidence of a current release from the known historical release. A variety of methods <br /> may be used to make that determination including trend analysis, groundwater chemistry <br /> typing, and indicator parameters that might be indicative of current operations. Potential <br /> methods of detection monitoring will be evaluated based on the results of the EMP and a <br /> method for detecting future releases from Simplot's lined ponds will be proposed. <br /> I:\6000s\6741.000\Archivc\6741-13.doc 1 1 <br />