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Henderson Mine SPCC/MCP May 1999 • 6.15 Sodium Hypochlorite-at 7500 and 8100 Level Pump Stations in Mine Presently, Henderson Mine does not operate the disinfection systems at these locations, but they aze operable and in-place if needed. Sodium hypochlorite (liquid solut~.on), with five percent free available chlorine, can be metered into the mine water for purposes of disinfection at the 7500 or 8100 mine level pump stations neaz No. 2 shaft. Arty spilled material would be mixed with the mine water at the pump station. No more than five plastic 55 gallon barrels of sodium hypochlorite (five percent free available chlorine) would be stored at the pump stations at any given time. 6.16 Sulfuric Acid-Creneral Considerations and Spill clean-up Sulfuric acid can be neutralized with chemically basic (or alkaline) substances such as soda ash or caustic soda. The acidity can also be neutralized by the natwal alkalinity of soil or water. Land spills may be contained by pitting or diking, and then neutralized. Appropriate personal protective equipment, including eye and respiratory protection, should be used when responding to sulfuric acid spills. 6.17 Sulfuric Acid-at Urad's Blower Building Sulfuric acid is stored in adouble-walled 300 gallon polyethylene tank in the Urad Treatment Plant Blower Building (Figure 4). This tank and its appurtenances only operate when the main 4,000 gallon system described in section 6.18 is being serviced or is non-functional. The polyethylene tank is enclosed within a 465 gallon caitainment sump consisting of reinforced concrete walls. Filling the tank is achieved bpi pouring directly from a single 300 gallon tote stored in the Reagent Building. Sulfuric acid is added to the plant effluent to reduce the water's pH below 9.2 standazd units piusuant to the CPDES dischazge permit. Acid addition is accomplished with a solenoid diaphragm pump that meters the acid through a small diameter plastic hose directly into the treated water. Treated water then flows via buried pipe into the 72-inch Woods Creek bypass line. 6.18 Sulfuric Acid-at Urad's Old Mill Building Sulfuric acid is stored in a 4,000 gallon tank in the Old Mill Building (Figure 4). The tank has a milltronics system for verifying the volume of solution scored and is enclosed within a 4,800 gallon polyethylene tank which sits within afull-volume containment sump consisting of reinforced concrete walls. Capacity of the containment has been calculated as 5,660 gallons. Tank unloading from trucks (typically 3,000 gallon tankers) to the tank is accomplished with a hose via a loading port on the side of the building. • I8