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<br />1. Askid-mounted oil storage shed with nominal dimensions of eight feet by ten feet will be <br />located adjacent to the maintenance shop. Up to 500 gallons total of the listed products will be <br />stored in the skid-mounted shed. Container size will range from 5 gallons to 55 gallons. This <br />shed will drain to the Sediment Pond. The listed products are: Antifreeze, motor oil, gear oil, <br />hydraulic oil, ATF, rock drill oil, and gasoline. Secondary containment will consist of the walls <br />of the shed and shop. <br />• <br />• <br />2. Used Oil drums will be placed on a concrete pad equipped with secondary containment walls <br />and a roof (to prevent contamination of rainwater). Used oil will be transferred to the drums <br />using manual methods. <br />3. Up to four 500-gallon diesel fuel tanks will be installed on the Whirlwind Pad area (referred to <br />as the fuel station on Map C-2) immediately west of the ore pad. These tanks will be installed <br />within larger livestock tanks (approx. 700-gallons each). The fueling station area will be <br />isolated with low rolling berms of six to nine inches in height that will fully contain the <br />contents of the largest fuel tank plus direct precipitation from the 100-year storm event (i.e., 2.9 <br />inches of precipitation). <br />4. There will be 100 to 500-gallon diesel fuel tanks outside the generator trailers at the Whirlwind <br />and Packrat Portals, water treatment plant, and possibly one of the remote ventilation shafts. <br />Secondary containment will be provided by livestock tanks large enough to hold a minimum of <br />110 percent of the diesel tank volume. <br />5. Small containers of oil and lubricants (less than 100 gallons total) will be stored and used in the <br />two maintenance shops (i.e., Whirlwind and Packrat shops). Secondary containment will be <br />provided by the shop walls and floor. <br />Whirlwind Mine 07 (rev. April 08) <br />D-21 <br />