1995-08-11_REVISION - M1977493 (9)

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related to Climax, in this historic district occurred just following World War II. Zinc was the target resource during this period. EPFs or Designated Chemicals for Water Treatment: As discussed, various source waters are treated by lime precipitation to raise the pH and precipitate metal hydroxides. Precipitates (treatment sludges) are contained within the Mayflower impoundment. Prior to discharge to Ten Mile Creek, a sulfuric acid drip is employed to reduce the final pH into the range stipulated by the CDPS Permit. The specific EPFs for designated chemicals for the water treatment system are discussed in detail in Appendix B. Lime: Slaked lime currently is produced at the TDH by a portaslaker and added directly to the collected water stream. The lime station scheduled for completion in late 1995 includes three 75 ton conventional silos for storage of limestone prior to slaking and three 8000 pound per hour slakers. Additional details are provided in Appendix I. Sulfuric Acid: Sulfuric acid is incorporated into the water treatment system to lower the pH of discharged water from approximately pH 11 to pH 6.5-9.0. Sulfuric acid is stored in a 10,000 gallon stainless steel tank at the Mayflower pump station. The tank is within a concrete lined sump designed to contain 120 percent of capacity. Process Water Tanks: As discussed previously, two welded steel process water tanks located at and just above the the mill site serve to store and contain mill process water returned from the Robinson Reservoir as per Appendix E. Each tank has a capacity of 1 million gallons. Water from these tanks are fed to the crushing and milling circuit through a gravity line. EPFs or Designated Chemicals for Concentrate Production: The EPFs for the designated chemicals (Table 1) used for milling and production of concentrate at the Climax mill include enclosed buildings, tanks and bins, sumps, and berms singly or in combination (Figure 3). However, the final end point EPF for all designated chemicals is the Mayflower tailing impoundment and the associated water treatment and discharge system. As stated previously, the mill site and all of its ancillary facilities are located within the upper Ten Mile Creek watershed. Therefore,My release of a designated chemical or process waters at the mill which is not contained at the release site ultimately would be contained at the tailing impoundments. The specific EPFs for designated chemicals at the mill are discussed in detail in the SPCC/MCP (Appendix B). Sodium Cyanide (dry and solutionl: Sodium cyanide is stored dry in eighty, 100 pound commercial drums within a concrete bermed containment 23