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Henderson Mine SPCC/MCP May 1999 means of a "quick couple" system housed inside the building for containment and the outside has a small depression where spills or leaks would be contained in thc: unlikely event of a hose breakage at the truck. Inside the building are spill control items such as empty drums, floor dry, buckets, a broom, and a shovel. The shops and service bays also have smaller quantities of oils, greases and solvents in use. Generally these areas aze designed so that spilled petroleum products report to floor drains that report, in tum, to an oil skimmer, and fmally the sewage treatm~:nt plant. Therefore, it is unlikely that oil-contaminated waters from the shops and service bays would escape the in-place treatment system of Henderson Mine. 6.4 Petroleum Products-Used Oil Storage Building and Tank Used oil at the mine is stored in a 47,000 gallon tank, surrounded by a concrete retaining wall which is capable of holding 48,300 gallons. Totes and drums containing used oil aze stored inside the Used Oil Building, a concrete bermed facility, having a cortainment voltune of some 4,000 gallons. From totes and drums, used oil is Vansferred to the 47,000 gallon used oil tank via pipeline. This pipeline is pressure tested at least semi- annually and is the subject of an annual integrity test. Used oil is collected an<l shipped off-site for recycling. Inside the Used Oil Building aze spill control items such as empty totes and drums, floor dry, buckets, and a shovel. 6.5 Petroleum Products-Fuels (Gasoline and Diesel) on the Mine Surface A fuel island is located west of the No. 1 Settling Pond (Figure 2). Eight thousand (8,000) gallons of unleaded gasoline aze stored at this location in a single above ground storage tank. A standard service station style pump and dispenser are used for fueling vehicles directly from the tank. Also at the fuel island there is a 10,000 gallon No.l diesel above ground storage tank. By means of ahand-actuated electric switch the fuel nozzle lever is depressed to allow fuel to flow. Both the gasoline tank and the #1 diesel storage tank are fully enclosed by a 35 foot x 70 foot x 3.5 foot concrete containment structure with a capacity of 64,000 gallons. (Figure 2). In the Surface Shop approximately 500 gallons of lubricants and 150 gallons of ~mtifreeze aze stored. Spills of these materials would report to the building's concrete floor where they could be handled with conventional spill clean-up gear such as sorbent booms, pads, pillows, floor dry, buckets and shovels. 6.6 Petroleum Products-Oil and Fuel Surface Unloading Point for In-Mine Storage Oil and fuel used underground in the mine aze transferred directly from tanker trucks to underground storage. The above ground tanker loadout hose connection for in-mine • storage of diesel fuel and hydraulic oil (Figure 6) is located next to No. 1 Shaft (Figure 2) Seven thousand gallon tanker trucks pazk in a 7,500 gallon capacity concrete sump when transferring fuel and oil to the underground storage facility. 14