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<br />CNW~p The concentration has risen 1.0 mg/1 <br /> over a 60-day period to <br /> higher than two standard <br /> deviations above the mean <br /> (or 10 times the detection <br /> limit if none has been <br /> detected in the past) and <br /> shows signs of continuing <br /> the increasing Vend. <br />pH The pH has risen over the 9.5 s. u. <br /> same 60-day period to <br /> higher than two standard <br /> deviations above the mean <br /> and shows signs of <br /> continuing the increasing <br /> trend. <br />Explanatory Note: The design fluid capacity of the Valley leach facility is 94 million gallons. <br />The normal and maximum "authorized" capacity upon which notification will be given to the <br />OMLR is 80 percent of this volume, or on the order of 75 million gallons. The amounts of <br />water that might be returned to the pad should the concentrations of CNW,,p be in excess of that <br />allowed are very small and therefore insignificant in comparison to these capacities and should <br />have no material adverse affect on the status of the valley leach facility in the event of an <br />imperfection in the liner system that allows leach solution to migrate outside the boundaries of <br />the facility. <br />Treatment and discharge of leaching solution: <br />In the event that it is necessary, based on exceedence of the listed criteria which, in combination <br />or separately demonstrate a continuing release of leach solution to the environment from the <br />valley leach facility, as part of the procedures to mitigate the release of leaching solution that <br />has migrated past the boundary of the leach facility and which has migrated to or toward the <br />permit boundary, CC&V will institute all necessary and appropriate measures to contain and <br />detoxify all or that part of the leach solution determined to cause the continuing release. At this <br />time CC&V will cease addition of cyanide to the area(s) believed to be the source of the release. <br />If it can be shown to the satisfaction of the Office that the release is isolated to a specific portion <br />of the heap leach facility, and that the portion of the heap leach facility can be isolated from the <br />remaining heap leach facility with respect to cyanide solution application, the Office may give <br />approval for application of cyanide solutions to heap leach facility areas that do not add <br />appreciable fluid to the area of the release. <br />In the event that it is necessary and appropriate to remove solution from the Pad in order to <br />mitigate exceedences of the Underdrain system, LDS, or ground-water criterion, the water will <br />6 <br />