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J <br />criteria. <br /> <br />By July 1, 1994, LAC Minerals shall submit for approval a Performance Monitoring Plan <br />that will be used as a basis for assessing performance of the various components of the <br />reclaimed facility, including the PidWaste Impoundment, the South Waste Dump, <br />contaminated groundwater in the pit and waste dump area, the Leach Pads, and ancillary <br />facilities. The performance monitoring plan shall take into account the concepts described <br />in the examples given below. <br />The Department will develop site-specific performance criteria (or standards) for each <br />component of the reclaimed facility after reclamation has been completed, when achievable <br />cleanup limits can be realized. After performance criteria are developed, if any reclaimed <br />component of the facility is generating AMD-related contamination to the point where <br />performance criteria are not being complied with, LAC Mmerals shall submit for approval <br />a site-specific mitigation plan as per condition no. 5 under Postclosure. <br />The Department may alter the performance criteria based on the annual assessments and <br />changing conditions at the site. For clarification, it should be understood that compliance <br />with performance criteria will be based on expected trends in environmental monitoring <br />as the reclaimed system approaches ambient conditions and/or equilibrium. For example: <br />a. The water quality of contaminated groundwater in Spruce Gulch should be <br />expected to reach ambient conditions in 30 years and approach that level at a <br />predictable rate and according to a calculated curve. Perturbations away from the <br />curve may trigger alternative rechunation work, depending on the degree of <br />perturbation and associated environmental impacts, and <br />b. Temperature and oxygen concentrations in the reclaimed backfill material, the <br />moisture content of the clay layer, and infiltration rates as recorded by the quantity <br />of water collected in lysimeters, should reach equilibrium within approximately <br />two years. These type of physical monitoring measures, taken at the same time <br />each year, will assess the success of the pidwaste impoundment. <br />IS <br />