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5. Chemical Handling Systems and Containment <br /> All chemicals are currently stored on site and housed in a separate partition of the filter building.This is called <br /> the reagent room or chemical storage area.The plan view of the filter building and its associated environmental <br /> controls are shown in Map 1. <br /> As described in Exhibit T of the permit,the northeast part of the Filter Building houses the chemical storage <br /> area.A garage door can be opened to allow chemicals to be brought into the building and to allow empty <br /> containers to be taken out.Chemicals arrive in secured sacks, metal drums or plastic totes which have a <br /> protective metal mesh around them.The chemical list was previously revised and is included in this section for <br /> convenience.The maximum amount stored is also included.The chemical storage area is also next to two large <br /> 18,000 gallon tanks; one is for tailings slurry and the other is for process water.The floor of the chemical storage <br /> area is 6" reinforced concrete slab with an epoxy layer seal on top to prevent damage to the concrete if a spill <br /> occurs.The three vertical concrete walls of the chemical storage area are 6"thick and are also epoxied.The <br /> entrance wall with garage door achieves containment using a 12"thick by 6"tall tapered concrete and epoxied <br /> curb.Given the dimensions of the walled area: 27 feet x 56 feet x 6" height,the available volume is 756 cubic <br /> feet or 5,655 gallons.The maximum liquid container in the storage area is 375 gallons of liquid sodium <br /> hydroxide,which is 50.1 cubic feet,therefore,the vertical walled area is more than adequate to contain the full <br /> volume from the maximum size tank rupture. In actuality, it can hold 15 times this volume.A telehandler or <br /> skidsteer is used to transfer chemicals from the outside area to the chemical storage area through the garage <br /> door.The vertical wall at the garage door opening is protected from damage during chemical transfer by slanted <br /> concrete to allow the tires of the machinery to cross over the wall.A sump was installed in the floor of the <br /> chemical storage area which has a level controlled sump pump. If any water, slurry or liquid chemical is spilled in <br /> the storage area, it will flow to the sump,where it will be pumped back to the 18,000 gallon process water tank <br /> or reagent mixing tanks based on the event. <br /> There is an additional protection against spills leaving the filter building area,which is a concrete apron of 78 <br /> feet long and 9-10 feet wide.The thickness of the reinforced concrete is 6 inches.A Swale was formed in this <br /> concrete which is 6"to 8" deep and leads to a sump on the east side of the building.A level controlled pump of <br /> 300 gpm capacity has been installed in this sump to automatically pump any liquids or slurry back to the <br /> thickener or 18,000 gallon slurry tank.The apron can capture any leakage from the chemical storage garage <br /> door as well as the 2 doors where the fine tailings are dropped from the filter presses into the 2 bays <br /> immediately west of the chemical storage area.This concrete apron was approved as part of TR-05. <br /> Revenue Mill Certification Page 15 of 20 <br />