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Henderson Mine SPCC/MCP May 1999 <br />• 6.21 Concrete and Its Components-at Henderson Mine <br />Concrete is mixed in the Batch Plant at No. 2 Shaft and is then piped underground where <br />it is used in shotcrete for construction of draw points and other mine structures. Dry fly <br />ash and cement aze stored at the Batch Plant and aze used as additive components of the <br />concrete mixture. Liquid plasticizer (Polyheed 997) is stored at the No. 2 Shafr subcollaz <br />in two 500 gallon tanks which aze located within a concrete containment swnp. The <br />plasticizer (Polyheed 997) is added to the shotcrete during mixing to improve its adhesion <br />chazacteristics. Concrete accelerant (Meyco TCC-766) is stored in three 10(10 gallon <br />tanks in the Aggregate Storage Building at the Batch Plant. Meyco TCC-766 is mixed <br />with the concrete to speed up the curing process. Because of the caustic nature: of these <br />substances, spillage should be controlled and isolated from both the surface and <br />underground water systems to the extent practicable. <br />6.22 Flocculents-Henderson Mine and Urad Minesite <br />Non-hazazdous flocculents (sometimes referred to as polymers) aze added dieing the <br />water treatment process to enhance settling of particles. There are two five-hundred <br />gallon flocculent tanks in the Henderson Mine No. 1 Pond Flume House. Spillage from <br />these tanks would be contained within the No. 1 Pond. The flocculent tank in the Urad <br />Water Treatment Plant is located in the main portion of the plant. Any spillage from this <br />• tank would report to the building's main sump. There is also a flocculent system in <br />Urad's Old Mill Building that can be used during direct water treatment in the Urad <br />Treatment Ponds. Spillage from this tank would report to a floor drain that is piped to the <br />Lower Pump Pond. <br />6.23 Quicklime (Calcium Oxide~Urad Water Treatment Plant <br />Quicklime or calcium oxide is stored at the Urad Water Treatment Plant in two one-ton <br />silos. Silos aze filled pneumatically from 25 ton tanker trucks by blowing the quicklime <br />through the baghouses at the top of each silo. Dry quicklime is fed from the silos to <br />slakers inside the Urad treatment plant where water is added to the lime to fotm a slurry. <br />This lime slurry is used to raise the pH of the water during the initial phase of water <br />treatment. In the event of a spill of dry quicklime, the lime can be cleaned up using <br />shovels and disposed of in the sludge. A spill of slaked lime within the building should <br />be routed to the sump system using water sprays and brooms. <br />6.24 Drewfax 259 (Sodium Acrylate Polymer}-at Henderson Mine <br />Drewfax 259 is used for processing mud in the underground portion of Henderson Mine. <br />Approximately five 300 gallon totes aze stored at the No. 1 Shaft Hoist House for use <br />underground. Storage of the Drewfax 259 totes occurs within a concrete containment <br />. structure having a capacity of almost 5,000 gallons. A spill from one of the totes can be <br />isolated within the containment azea, mixed with floor dry or sand, scooped up with a <br />shovel and broom, and stored in a drum for proper disposal. <br />20 <br />