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PETROLEUM PRODUCTS -FUEL STORAGE and DISTRIBUTION <br />• Two 8,000 gallon capacity fuel tanks (diesel, unleaded gasoline) are located <br />above ground at the mill between the crusher and locomotive shops. (Figure <br />2). Ahand-actuated electric switch must be on at the same time that the fuel <br />nozzle lever is depressed to allow fuel to flow. Each of the fuel ts~nks is <br />separately enclosed by a 10 foot by 24 foot by 5 foot steel containment <br />structure with a capacity of 8,800 gallons. An unused above-ground 1,000 <br />gallon diesel tank with secondary containment is located north of the <br />crusher. It was used at one time as a backup fuel for the zinc melting <br />furnace, but has not been used in many years and there are no plans to use it <br />in the future. Periodic visual inspections of the fuel tanks are conducted and <br />documented by mill personnel. <br />PETROLEUM PRODUCTS -DIESEL -MILL BUILDING <br />Diesel is used in the ore milling process as a substitute for vapor oil. If <br />economic conditions change, vapor oil could be stored in the diesel tank. <br />Currently, diesel is delivered by tanker truck and transferred into a 32,000 <br />gallon storage tank located inside the mi{I building (Figure 2). The storage <br />tank is underlain by a concrete floor and surrounded by a 23,75 foot by 60 <br />foot by 3.8 foot high concrete wall. The enclosure provides routing of any <br />spill in the containment to the tailings impoundment. <br />PETROLEUM PRODUCTS -Chevron 320 O MILL BUILDING <br />Henderson is planning to install (1999) a new 4000 gallon dual walled steel <br />tank inside the mill building for storage of Chevron 320 oil used to deliver <br />lubricating oil to all four primary mills. The tank will set on two concrete <br />raised pads that rest directly on a gently sloping portion of the mill concrete <br />floor. Due to the sloping configuration of the floor, any spilled Chevron 320 <br />oil would be captured by the mill sump system. <br />PETROLEUM PRODUCTS -PINE OIL -MILL BUILDING <br />Pine oil is used in the ore milling process. It is delivered by tanker truck +3nd <br />transferred into a 14,400 gallon storage tank located inside the mill building <br />(Figure 2). The storage tank is underlain by a concrete floor and surrounded <br />by a 23.75 foot by 60 foot by 3.8 toot high concrete wall. The enclosure <br />provides routing of any spill in the containment to the tailings impoundment. <br />C~ <br />Page 7 <br />