4.5 PCSR 01-14-2014 - Laserfiche WebLink

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8a. Groundwater Protection Plan: McCrossan is proposing to extend the depth of excavation to the top of the water table and then backfill to the final reclamation grades. Final reclamation Grades will be a minimum of five feet above the water table. This groundwater protection plan has been prepared to identify specific measures to be adopted to minimize or eliminate the potential for any impacts to the groundwater. Groundwater Conditions: The elevation of the water table in the vicinity of the Site was identified in the EIS. Hydrologic work associated with the Elk River landfill has provided additional water table elevation data points. Figure 6, Groundwater Table Conditions, illustrates well locations and the elevation of the surface of the water table across the site. Equipment Maintenance: Limited equipment maintenance is performed on-site and follows company spill prevention policies. Storage Tanks: It is anticipated that a fuel service will be used to fuel on-site equipment. In the event that fuel storage does occur on site, fuel or used oil storage tanks over 1,100 gallons (or 500 gallons if within 500 feet of surface water) located on site will be above ground tanks, and will be double walled or have secondary containment designed in accordance with MN Rules Chapters 7001 and 7151. Tanks will be registered with the Minnesota Pollution Control Agency (MPCA). They will be labeled, equipped with corrosion and overfill protection, and visually monitored for leaks and inspected on a weekly basis. At least one person will be present during unloading and loading of a tank. Topping off: Company policy does not allow topping off of any tank during transfer operations. All transport piping is above ground and tanks are equipped with audible electronic alarms to prevent over filling. Warning signs and chock blocks are used to prevent premature vehicle departure. Spill Prevention Control and Counter Measures Plan (SPCC Plan): An SPCC Plan will be prepared for the site. This plan documents procedures to be followed in the event of a spill or release at the site. Any spill of oil, gasoline, diesel fuel, lubricant, or asphaltic cement is to be reported to the Site Manager and cleaned up promptly. Any spills of 5 gallons or more of petroleum products or any volume of hazardous materials are reported to the state duty officer as required by applicable state statutes and regulations(Minn. Stat. 299K). Spill Containment Equipment: Spill cleanup equipment will available on-site during periods of active mining including equipment to excavate and remove impacted soils in an expedited fashion, as well as firefighting extinguishers, absorbent pads, spill blocker dikes, empty barrels, rags and shovels. 9. Drainage, Erosion Control,Sedimentation, Dust,Access Control and Security: The site will require an MPCA NPDES permit. A Stormwater Pollution Prevention Plan will be required as part of the NPDES permit. Surface water drainage from active mining areas will be directed to low areas within the excavation. Collected surface water will infiltrates into Page I 4