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Whirlwind Mine <br />MC /SPCC <br />Section 4.0 -Preventative Facilities <br />Page 6 of 8 <br />06/29/07 <br />Storage and use of materials which represent a potential spill threat are limited to the <br />locations listed below. The preventative features of these locations are described in the <br />listing below. <br />Location <br />1. Lubricant Shed & Maintenance Shop <br />2. Used Oil Tank <br />3. Domestic Water Tank <br />(Chlorinated Water) <br />Spill Containment Features <br />Enclosed Building <br />Absorbent Materials <br />Galvanized Metal Containment Basin <br />Earthen Containment <br />4. Aboveground Fuel Storage Tanks <br />Galvanized Metal Containment Basins <br />Dawn Slope Earthen Berm <br />5. Water Treatment Facilities - <br />Water Treatment Plant Building <br />Internal Sump, Low Flow & Low Level <br />Shut Off Sensors, Spill Containment Tank <br />Untreated or In-Process Water <br />Storage Ponds <br />6.Ore Storage Pad <br />See Note 1 <br />See Note 2 <br />Note 1: Low-permeability synthetic liners surrounded by earthen berms with grade and slope <br />features for containment and collection. High and Low Level Mine Drainage Pump and Water <br />Treatment Process Shut-Off Switch. <br />Note 2: Surrounded by earthen berms with grade and slope features for containment and <br />collection, runoff drains to a Local samp that transfers to the Untreated Water Pond. <br />Note 3: Low & High Level and Low Flow sensor systems are checked quarterly. <br />Note 4: Storm water runoff is routed around the mine site via diversion channels. <br />Note 5: Within the mine site, runoff from the ore storage and the maintenance areas is directed <br />to the Untreated Water Pond and runoff from all other areas is directed to a sediment <br />pond, which also provides additional containment in the event of a spill. <br />