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Ms. Rebecca Haug <br />March 9, 2011 <br />Page 2 <br />Erosion and Sedimentation (Item 16) <br />Items 16 and 17 provide minimal narrative to describe that during active mining, stormwater will be <br />handled internally and that sedimentation basins, diversion berms, silt fences, and other appropriate <br />controls will be used to treat stormwater. However, the EAW should additionally provide <br />proposed/estimated sizing information and layout description on the site plan to show how these <br />controls will fit into the excavation plan. Additional understanding of how the stormwater runoff and <br />sediment capture will be accommodated on site is needed in order to assess that the proposed <br />treatments have a reasonable assurance of mitigating the runoff and water quality impacts. <br />Water Quality: Surface Water Runoff tltem 17) <br />It is indicated that the stormwater Pollution Prevention Plan (SWPPP) and National Pollutant Discharge <br />Elimination System/State Disposal System (NPDES/SDS) Permit for the existing mining facility (this <br />permit should be identified in the EAW) will be modified to include the additional acreage for the <br />proposed activity. It should also be noted that the current SWPPP for the existing facility must also be <br />modified to meet current NPDES/SDS Permit requirements, which were changed in August of 2008 after <br />the permit was re-written. The new requirements will require the SWPPP to list estimated quantities of <br />erosion and sediment control best management practices to be used on the site, identify new time lines <br />for stabilization, and provide erosion and sediment control training certification for the SWPPP designer <br />and the erosion and sediment control inspector for the Project. There are also new requirements for <br />concrete washout facilities and for projects located within one mile of special or impaired waters, which <br />do not appear to apply in this instance. <br />We appreciate the opportunity to review this Project. Please provide your specific responses to our <br />comments and notice of decision on the need for an Environmental Impact Statement. Please be aware <br />that this letter does not constitute approval by the MPCA of any or all elements of the Project for the <br />purpose of pending or future permit action(s) by the MPCA. Ultimately, it is the responsibility of the <br />Project proposer to secure any required permits and to comply with any requisite permit conditions. If <br />you have any questions concerning our review of this EAW, please contact me at 651-757-2508. <br />Sincerely, <br />~~a~ <br />Karen Kromar <br />Planner Principal <br />Environmental Review and Feedlot Section <br />Regional Division <br />KK:mbo <br />cc: Craig Affeldt, MPCA, St. Paul <br />Scott Lucas, MPCA, Brainerd <br />Jim Kolar, MPCA, St. Paul <br />Larry Zdon, MPCA, St. Paul <br />Reed Larson, MPCA, Brainerd <br />