REP23295 - Laserfiche WebLink

Home Browse Search

Henderson Mine SPCC/MCP May 1999 7.0 POTENTIAL SP[LL MAGNITUDE 7.1 Potential Spill Magnitude at Henderson Mine Potential releases at Henderson Mine could range from a spill of a hazardous material of less than a gallon from a single container, to a catastrophic failure of used oil from the lazgest above ground storage tank of 47,000 gallons. Spills of a few gallor.~s can be readily contained by the use of absorbents or containment structures (permanent or temporary). Lazge catastrophic releases from tanks containing oil or hazazdous material would be contained in permanent secondary containment structures. Oil, diesel fuel and gasoline (petroleum products) are delivered to the mine Icy tanker trucks, typically in 7,000 to 8,000 gallon shipments. These deliveries are unloaded directly to the underground, to the bulk oil storage building, or to the fuel i:;land. A petroleum product spill could occur when a tanker wck is being unloaded. A v~orst case dischazge of the entire contents of a truck compartment would result in up to 7,000 gallons being released. Smaller spills could occur through draining of transfer hoses or pump leakage. Most hazardous chemicals aze not received at the mine in bulk. A worst case ciischazge for these chemicals would be the contents of a single drum or tote and would re:~ult in 55 to 350 gallons being released. Sodium hydroxide is received at the mine in bulk. A worst case dischazge of the entire tanker truck contents would result in up to 5,000 gallons being released. 7.2 Potential Spill Magnitude at Urad Minesite Potential releases at the Urad Minesite could range from a spill of a hazardous material of less than a gallon from a single container, to a catastrophic failure of sodium hydroxide from the lazgest above ground storage tank of 10,000 gallons. Spills of a few gallons can be readily contained by the use of absorbents or containment structures (permanent or temporary). Lazge catastrophic releases from tanks containing oil or hazazdous iraterials would be contained in permanent secondary containment structures. A petroleum product spill could occur when a portable tote is being unloaded. A worse case dischazge of the entire contents of a tote would result in up to 350 gallons being released. Smaller spills could occur through leakage or drainage of transfer hose<.+. If oil or gasoline should escape from a primary or secondary container, the distance and azea over which spilled material travels depends on several factors including: total volume dischazged; rate of dischazge; surface slope; viscosity of the spilled ligiuid; and porosity of the affected surface.