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3.6.1 Daily Inspection <br /> OSM employees perform a complete walk-through of the facility each day during normal seasonal <br /> operation. This daily visual inspection involves looking for tank/piping damage or leakage, stained <br /> or discolored soils, or excessive accumulation of water in the containment. All types of secondary <br /> containment should be visually checked for damage. <br /> 3.6.2 Monthly Inspections <br /> The checklist provided is used for monthly inspections by OSM personnel. The monthly inspections <br /> cover the following key elements: <br /> • Observing the exterior of aboveground storage tanks, pipes, and other equipment for signs of <br /> deterioration, leaks, corrosion, and thinning. <br /> • Observing the exterior of portable containers for signs of deterioration or leaks. <br /> • Observing tank foundations and supports for signs of instability or excessive settlement. <br /> • Observing the tank fill and discharge pipes for signs of poor connection that could cause a <br /> discharge, and tank vent for obstructions and proper operation. <br /> • Verifying the proper functioning of overfill prevention systems. <br /> • Checking the inventory of discharge response equipment and restocking as needed. <br /> • Check all types of secondary containment on site for damage. <br /> Problems regarding tanks, piping, containment, or response equipment must immediately be <br /> reported to an Immediate Supervisor. Immediate Supervisor will report to the Mill Manager, who <br /> will report to the General Manager and Environmental Specialist. Visible chemical leaks from tank <br /> walls, piping, or other components must be repaired as soon as possible to prevent a larger spill or <br /> a discharge to navigable waters or adjoining shorelines. Pooled chemicals are removed immediately <br /> upon discovery. The Monthly Inspection Checklist is included in this section and the inspection will <br /> be conducted during normal seasonal operation of the site. <br /> Written monthly inspection records are signed by the Environmental Department or the General <br /> Manager and will be maintained with this MCP Plan for a period of five years. <br /> Tank Location Inspection <br /> Tails Thickener NW of the Mill Building M A <br /> Zinc Sulfate Mix Tank Reagent Room Mill Bldg.) M, A <br /> Zinc Sulfate Storage Tank Reagent Room Mill Bldg.) M, A <br /> Copper Sulfate Mix Tank Reagent Room Mill Bldg.) M, A <br /> Copper Sulfate Storage Tank Rea ent Room Mill Bldg.) M, A <br /> Flocculent Storage Tote Tails Thickener Containment M <br /> Materials Containment Plan (MCP) Page 18 of 33 May 2021 <br />