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PETROLEUM PRODUCTS- ANTIFREEZE -MILL HEATING SvsTeM <br />Approximately 34,000 gallons of a 50 percent ethylene glycol in water <br />solution are contained in the mill heating system which consists of toilers, <br />heat exchangers, and pipelines. Leaks or breaks in the system should be <br />isolated by shutoff valves and repaired. Any drainage or spills due to routine <br />maintenance are captured and recycled by placing in the make-up tank. In the <br />unlikely event of a major break in the system, the solution would be <br />contained behind the tailing dam (Figure 2). <br />PETROLEUM PRODUCTS - COHEREX -MILL TAILINGS AREA <br />Coherex is a biodegradable hydrocarbon consisting of 50 percent petroleum <br />resins and 40 percent wetting solution.and is used in dust control during the <br />summer and fall on the roads and on the tailing pond (Figure 2). A Coherex <br />and water mixture is sprayed on roads and on the tailing pond by a 3,000 <br />gallon Tryco balloon tired vehicle or a 2,800 gallon Terragator balloon tired <br />vehicle. <br />The Coherex solution is stored near the pond maintenance building in two <br />dual-walled steel 10,000 gallon storage tanks mounted on a concrete pad <br />that drains to a central location, where any spillage would be collecte~j and <br />drained to the tailings impoundment. There is a visual leak detection s~~stem <br />in place to determine if drainage to the sump has occurred. <br />PETROLEUM PRODUCTS- USED OIL from MILL <br />Used oil resulting from equipment oil changes is collected in 550 gallor tote <br />containers, which are located in various buildings throughout the Mill site. <br />Full totes are temporarily stored in the fully contained oil storage building. <br />The used oil is recycled by an off site vendor. <br />PETROLEUM PRODUCTS -OIL, SOLVENT, etc. <br />New oil at the mill is received in 55 gallon drums and 300 gallon bulk totes. <br />These drums are stored, prior to use, in the contained Oil and Bulk Storage <br />building (Figure 2). The containment will hold 8,250 gallons which exceeds <br />the amount of spillage expected in one incident involving drum damage or <br />rupture. Individual drum containment is utilized at specific usage locations. <br />Combustible solvents are also stored in the Oil and Bulk Storage buil~jing. <br />Flammable solvents are stored, prior to use, in the Flammable Materials / <br />Hazardous Waste Storage Building (Figure 2) on containment pallets. <br /> <br />Page 6 <br />