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Henderson Mine SPCC/MCP May 1999 • In the event that water treatment within the ponds is necessary, the stored sodium hydroxide can be delivered to both Pond No. 1 and Pond No. 2 via double-walled pipes. The delivery system consists of two variable-speed positive displacement pumps that can be controlled manually or by a remote controller. The dischazge side of t}~e pumps includes ananti-siphon vent to prevent siphoning of the sodium hydroxide to the: ponds in the case of a check valve failure. The site has been graded so that any spills outside of the Old Mill Building will flow to the treatment ponds. Each of these ponds can be: isolated, if necessary, from the remaining water courses by closing valves and/or insetting stop planks in the control slots. 6.12 Sodium Hypochlorite-General Considerations and Spill Clean-up Sodium hypochlorite reacts with acids or moisture to evolve free chlorine at room temperature. It is hazardous in contact with combustibles, organics, or easily oxidizable materials and could cause a fire. Small spills can usually be flushed to a suitable holding area and then to the sewer with high water dilution. When necessary, hypochlorite can be neutralized with weak reducing agents and then the waste can be landfilled. Respiratory protection is advised when dealing with spills of any size due to the caustic nat~ue of the fumes. 6.13 Sodium Hypochlorite-at Mine Sewage Treatment Plant (STP) • Sodium hypochlorite is fed into the STP (Figure 2) effluent at the rate of one to two gallons per day from a 55 gallon drum for disinfection purposes. Should this container rupture, any spilled material would be contained within the chlorine contact chamber. Additional drums are also stored in the STP and, in the unlikely event of a drum rupture, the contents would report to the treatment cells in the floor of the sewage plant. 6.14 Sodium Hypochlorite-at Mine Potable Water System Sodium hypochlorite is fed into the influent to the potable water treatment system (Figure 2) at the rate of one to two gallons per day from a 55 gallon drum. These drums of sodium hypochlorite (maximum of 3 drums) are stored in a concrete block building near the potable water storage tanks. in the event of drum rupture, the building its~;lf would control and/or contain the spillage; the containment area is capable of caph~ring 130 gallons of liquid (7 foot x 5 foot x 0.5 foot). Sodium hypochlorite is also used at the No. 2 Shaft sub-collar to boost the chlorine levels in the water going underground. This system uses one 55 gallon barrel located within a square metal containment structure capable of holding 65 gallons. Any leaks outside of containment would report to the shaft sump. • l7