5.5. SR 04-04-2011 - Laserfiche WebLink

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The Project proposer should also be aware that operation of a stationary crusher and aggregate spread that is greater than 25 tons per hour capacity, or greater than 150 tons per hour portable, and assuming the equipment is newer than 8/31/83, is subject to 40 CFR 60 Subpart 000 of the federal New Source Performance Standards. Under this subpart, the facility owner must conduct specific performance testing (i.e., opacity testing) when the mining site is in normal operation. Depending upon crusher size (tons per year) and year of manufacture, and generator horsepower and year of manufacture, the operation may also be subject to Subpart ZZZZ of the federal National Emissions Standards for Hazardous Air Pollutants, which has additional reporting requirements. If you have any questions on air permitting issues, please contact Jim Kolar in our St. Paul office at 651-757-2174. So noted. Operation of a stationary crusher is not planned for this project. The project proposer intends to comply with all air permitting requirements of the MPCA, as necessary. Erosion and Sedimentation (Item 16) -Items 16 and 17 provide minimal narrative to describe that during active mining, stormwater will be handled internally and that sedimentation basins, diversion berms, silt fences, and other appropriate controls will be used to treat stormwater. However, the EAW should additionally provide proposed/estimated sizing information and layout description on the site plan to show how these controls will fit into the excavation plan. Additional understanding of how the stormwater runoff and sediment capture will be accommodated on site is needed in order to assess that the proposed treatments have a reasonable assurance of mitigating the runoff and water quality impacts. The proposed project is a continuation of the current aggregate mining operation. Currently, there are no problems with the management of erosion and sedimentation for the adjacent areas and the proposer has indicated that all surface water from disturbed areas for the project will be directed internally. This is supported by the proposed mining plan. The proposer is subject to requirements of Sector J for the NPDES permit for Industrial stormwater, MN R05000. Additional details will be developed as necessary to implement a stormwater Pollution Prevention Plan (SWPPP) for the Site in accordance with erosion and sediment management requirements of MN R050000. Water Quality: Surface Water Runoff (Item 17) - It is indicated that the stormwater Pollution Prevention Plan (SWPPP) and National Pollutant Discharge Elimination System/State Disposal System (NPDES/SDS) Permit for the existing mining facility (this permit should be identified in the EAW) will be modified to include the additional acreage for the proposed activity. It should also be noted that the current SWPPP for the existing facility must also be modified to meet current NPDES/SDS Permit requirements, which were changed in August of 2008 after the permit was re-written. The new requirements will require the SWPPP to list estimated quantities of erosion and sediment control best management practices to be used on the site, identify new time lines for stabilization, and provide erosion and sediment control training certification for the SWPPP designer and the erosion and sediment control inspector for the Project. There are also new requirements for concrete washout facilities and for projects located within one mile of special or impaired waters, which do not appear to apply in this instance.