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IV. SPILLS POTENTIAL SPELL MAGNITUDE Potential releases could range from a spill of a hazardous material of less • than a gallon from a single container, to a catastrophic failure of hazardous material from the largest above ground storage tank of 50,000 gallons. Spills of a few gallons can be readily contained by the use of absort~ents or containment structures (permanent or temporary). Large catastrophic releases from tanks containing oil or hazardous materials would be contained in permanent secondary containment structures. Fuels, oils, diesel and gasoline ipetroleum products) are delivered to the mill by tanker trucks, typically in 7,000 to 8,000 gallon shipments, These deliveries are unloaded directly to bulk storage tanks. A petroleum product spill could occur when a tanker truck is being unloaded. A worst case discharge of the entire contents of a truck compartment ~,vould result in up to 8,000 gallons being released. Smaller spills could occur through draining of transfer hoses or pump leakage. If oil or gasoline should escape from a primary or secondary container, the distance and area over which spilled material travels depends on several factors including: total volume discharged; rate of discharge; surface slope; viscosity of the spilled liquid; and porosity of the affected surface. A worst case spill of bulk chemical hazardous materials during unloading operations could discharge the entire contents of a tanker truck. A spill of the maximum delivery volume of hydrochloric acid could result in a 5,000 gallon spill at the Acid Storage area {Figure 2). Many chemicals are received at the mill in smaller containers. A worst case discharge for these chemicals would be the contents of a single drum or tote and would result in 55 to 350 gallons being released. PAST SPILL HISTORY In the three years preceding this update, there have not been any reportat~le spills at the Henderson mill site. Since the operation began in 1976, only minor incidents have occurred and have been reported to the Colorado Water Quality Control Division. Henderson maintains the capacity to react appropriately to hazardous material spills. It possesses the equipment, materials, trained personnel and response systems necessary to control and neutralize the impact of accidental spills on neighboring environment and water resources. Outside emergency response teams are also available, if required, from Rock!r Mountain Catastrophe iRMCAT). Page 12