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PETROLEUM PRODUCTS -VAPOR OIL -MILL BUILDING Vapor oil is used in the ore milling process. It is delivered by tanker truck and transferred into a 32,000 gallon storage tank in the mill building. :should economic conditions change, the 32,000 gallon diesel storage tank c~3n and wilt be used to store vapor oil. The storage tanks are underlain by a concrete floor and surrounded by a 23.75 foot by 60 foot by 3.8 foot high concrete retainer wall. The enclosure provides routing of any spill in the containment to the tailings impoundment. PETROLEUM PRODUCTS -CONTRACTOR'S FUELS, OILS & GREA;iES During the construction of the new conveyor system at Henderson Mill, there will be several outside contractors working onsite. Contractors will be subject to the Spill Prevention Control and Countermeasures Plan incorporated into this MCP/SPCC by reference. A copy of the contrac;tor's SPCC plan is attached as Appendix F. PHOSPHORUS PENTASULFIDE -GENERAL The phosphorus pentasulfide powder itself is noncorrosive but produces hydrogen sulfide gas (H2S) and phosphoric acid IH3P04) when exposed to water. If the material combines with water in an area other than in the Nokes building, it should be neutralized by washing with dilute caustic. Land spillage should be cleaned up and taken to the mill for re-use, if possible, or disp~~sed of as waste according to applicable regulations. PHOSPHORUS PENTASULFIDE - NOKES BUILDING Phosphorus pentasulfide (P2S5) is delivered by truck in 4,000 pound aluminum tote bins which are stored on the dock of the Nokes building north of the mill (Figure 2). Total storage capacity is 20 tote bins or SO,t)00 pounds. Sodium hydroxide and phosphorus pentasulfide are combined in an 8,830 gallon Nokes mixing tank and then moved to a 21,800 gallon storage tank inside the mill building. Any P2S5 which might spill from a tote bin should be shoveled up and put into the P2S5 feeder system and fed into the Nokes mix tank. A liquid Nokes (P2S5/NaOHlH2O) spill inside the Nokes building should be captured by a containment sump and pumped to the thickener. Page 8