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Henderson Mine SPCC/MCP May 1999 The sulfuric acid is transferred from the 4,000 gallon storage tank to a 350 gallon tank located in the pH Adjustment Building (Figure 4). The acid flows by gravity into the smaller tank through double walled pipes equipped with a deadman switch that automatically closes if released. Secondary containment is provided by the building's sump which can contain the entire contents of the 350 gallon tank. The acid in the 350 gallon tank can be added to the pumps to adjust water pH if direct treatment within the ponds is required. Acid addition is accomplished with a solenoid diaphragm pump that meters the acid into a 6 to 20 GPM carrier stream of water. This acidified watr:r is then added to the treated water flow. The pump is equipped with an automatic shutoff switch in the event that carrier flow is intetntpted. 6.19 Non-hazazdous Materials-General Considerations and Spill Clean-up Non-hazardous materials that aze stored and used in large bulk quantities at the Henderson and Urad sites consist of ANFO (ammonium nitrate /fuel oil mixture), quick- lime (calcium oxide), concrete, cement, and fly ash. These bulk materials are mostly dry or highly viscous (not likely [o flow) and can be cleaned up with conventional spill control equipment. Large quantities may require afront-end loader and small dw.np truck for clean-up and smaller quantities can be scooped up with a shovel and dispo::ed of in drums or replaced in process if not contaminated. Other non-hazazdous materials, such as Polyheed 997 (liquid plasticizer), Rust Con X (rust inhibitor), DrewPak (mud processing underground), Dust Bind, and Meyco TCC- 766 (accelerant) are less viscous and likely to flow if spilled. Therefore, diking and berming the spilled material or enclosing with a sorbent boom will probably be the best spill control. Use of sand or floor dry to retard flow may also be effective. Once the spill has been contained and mixed with sand, soil, or floor dry, it can be cleaned-up with a front-end loader or hand shovel and placed in an appropriate container for disposal. All spills of non-hazardous materials should be protected from exposure to rainfall, snow, or snowmelt to prevent the runoff of contaminated waters from reaching drains, ditches, or any other water conveyances. 6.20 ANFO (Ammonium Nitrate /Fuel Oil Mixture~at Henderson Mine ANFO is used as an explosive in the underground part of Henderson Mine. It is clelivered to the site in bulk tanker trucks and stored in a 40 ton silo at the site. The ANFC~ storage silo is located southeast of the No. 2 Shafr (Figure 2). Beneath the silo is a concrete pad that would contain most spills of the granulaz material during unloading from bull.< trucks. The ANFO silo connects to an underground storage bin at the 7700 Level. If spilled, the granulaz ANFO material can be cleaned up immediately with shovels and brooms to prevent it from being washed into the surface drainage system or underground water • system. 19