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a spill until cyanide levels reach acceptable limits. Because <br />• hydrogen peroxide breaks down, it has a limited shelf life. If <br />hydrogen peroxide is used on site, care will be taken to maintain <br />a reliable source. <br />If alkaline chlorination is used, it will be necessary to <br />maintain elevated pH levels (8-11) for the reaction to occur. In <br />addition, cyanogen chloride gas can be generated. This gas is highly <br />toxic and care will be taken to keep the area well ventilated. <br />Alkaline chlorination can be accomplished using beads or by making <br />an aqueous solution. Monitoring of chlorine levels will occur during <br />use of this method to ensure that solutions with potentially toxic <br />chlorine levels are not released. <br />9.2 Soill Monitoring <br />In the event of an accident, spill, or leak which has the <br />potential to migrate from the point of occurrence spill monitoring <br />• ~ will be implemented. The exact nature and extent of the monitoring <br />plan will be determined by the nature of the spill and the potential <br />hazards created by the spill. The Mill Superintendent o~ senior staff <br />member present at the time of the spill will determine appropriate <br />spill monitoring. <br />The potential for spills of fuel, oil, coolants, or ANFO to <br />migrate from the point of occurrence is minimal. These materials will <br />be quickly absorbed into soil material. If a spill of these materials <br />occurs with the potential of a path of surface water, absorbent booms <br />will be placed at the point of entry and surface water monitoring <br />will be implemented downstream. <br />The potential for spills of mill reagents migrating from the <br />point of occurrence is also minimal. All mill reagents will be used <br />and stored in the mill area. The mill is designed for collection and <br />containment of all spills. <br />• <br />-17- <br />