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front end loader. The door to the left of these two, on the east side of the building, is the reagent <br />room door, where the reagent chemicals are loaded into the roI m and empty containers are <br />removed and taken back to the manufacturer for re- loading. The door on the far west side is used <br />for access to the underground mill. I <br />It has been decided to provide a secondary method of containment for tailings in the two center <br />garage bays and also for the reagent room. This will be accomplished by installing a steel bar <br />reinforced concrete apron immediately outside the 3 easternmost doors (two tailings doors and <br />reagent door). This apron will be 58 ft long and nearly 14 feet wide, as shown on the attached <br />apron drawings. The apron will be graded to run slightly to the south, away from the building. <br />On the southern end of the apron, a concrete trough will be installed to dimensions of 2.0 ft wide <br />and 1.0 ft deep. This trough will be covered by a steel grating so that vehicles and the front end <br />loader can travel over the trough. The trough will be graded to the eastern side, I here a sump of <br />4 ft wide x 4 ft long x 6 ft deep will be constructed. A slurry pump will be located at the bottom <br />of this sump, which will be automatically turned on if any liquid or slurry enters the sump. The <br />pipe from the pump will lead to a tee inside the reagent room' of the filter build' Ig, which can <br />direct the water to either the 18,000 gallon tailings slurry tank or the 18,000 gallon process water <br />tank. I <br />The concrete apron will have a hydronic tubing system with boiler fired heat to prevent the <br />buildup of ice and snow on the apron and in the trough. <br />Item 3 - Waste Oil Holding Facilitv I <br />The waste oil holding facility will be a 20' x 8' x 9' metal s i a -can to be located'outside <br />underground shops for waste oil storage, which is shown on Map C -2. The sea- I can will be lined <br />with an impermeable liner suitable for oil containment. This liner is a welded sheet metal box of <br />dimensions 8' wide x 20' long and 2.5' high. This box will contain over 2800 gallons, and there <br />will only be a maximum of 2 -120 gallon totes of waste oil in the containment at any one time, so <br />the secondary containment will contain 400 cubic feet, which is 2990 gallons, therefore the <br />containment is 1246% of the maximum volume. The chemical storage totes and the <br />