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Drift, the tunnels slope at a 1% grade away from these intersections. Both tunnels slope to a <br /> common sump at the back of the Mill Area. This sump has a 3,000-gallon capacity to contain any <br /> potential release from the Mill. From the portal of the Mill Tunnel to the sump, the floor, walls, <br /> and roof are lined with concrete to seal the tunnel from water infiltration and chemical/material <br /> release or spill. <br /> 3.4 Handling and Release/Spill Response <br /> As discussed in Section 3.3 the Mill tunnels are constructed to prevent any release of material from <br /> the Mill. Should a spill occur, the sump is pumped back into the process . Minor spills of chemicals <br /> and their safe handling are discussed below. Further detail on exposure levels and first aid <br /> measures can be found in the SDS sheets for each chemical located in Appendix A <br /> 3.4. 1 Promoter Aerofloat-242 - Liquid <br /> When handling Aerofloat-242, the following PPE should be used: tight fitting chemical safety <br /> goggles or face shield and protective gloves and clothing. A MSHA approved dust mask or respirator <br /> should be worn if conditions are dusty or if fumes are present. It is recommended that adequate <br /> ventilation or a local exhaust system be used. Wash thoroughly after handling. <br /> In the event of a spill/release where level of exposure is unknown, a positive pressure, self- <br /> contained respirator is required. A two-piece PVC suit with hood or PVC overalls with hood is <br /> recommended during clean-up. The Aerofloat-242 can be covered with inert absorbent and swept <br /> up into containers for appropriate disposal. Water can be used to flush the spill area. If the spill is <br /> more than 100 pounds, it is considered reportable. Section 5 outlines the procedures for reporting. <br /> 3.4.2 Danafloat 067 <br /> When handling Danafloat 067, the following PPE should be used: chemical splash goggles, chemical- <br /> resistant, impervious gloves, appropriate footwear and clothing. <br /> In the event of a spill/release avoid dispersal of spilled material and runoff and contact with soil, <br /> waterways, drains and sewers. Inform the relevant authorities if the product has caused <br /> environmental pollution (sewers, waterways, soil or air). Stop leak if without risk. Move containers <br /> from spill area. Approach release from upwind. Prevent entry into sewers, water courses, <br /> basements or confined areas. Wash spillages into an effluent treatment plant or proceed as <br /> follows. Contain and collect spillage with non-combustible, absorbent material e.g. sand, earth, <br /> vermiculite or diatomaceous earth and place in container for disposal according to local <br /> regulations. Dispose of via a licensed waste disposal contractor. Contaminated absorbent material <br /> may pose the same hazard as the spilled product. <br /> 3.4.3 Aerophine 3418 <br /> When handling Aerophine 3418, the following PPE should be used: nitrite or fluorinated rubber <br /> gloves, impervious clothing, chemical resistant googles. <br /> In the event of a spill/release where exposure level is not known, wear approved, positive <br /> pressure, self-contained respirator. Where exposure level is known, wear approved respirator <br /> suitable for level of exposure. In addition to the protective clothing/equipment, wear a two-piece <br /> Materials Containment Plan (MCP) Page 13 of 33 May 2021 <br />