10-02-2017 Council Packet - Laserfiche WebLink

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On the Need for an Environmental Assessment Worksheet Findings of Fact Bituminous Roadways, Inc. Hot Mix Asphalt Plant Project Conclusions of Law Columbus, Minnesota And Order 14 80. Minnesota noise standards do not include a standard for ground vibrations. 81. The MPCA finds the Project, as it is proposed, does not have the potential for significant environmental effects based on the type, extent, and reversibility of impacts related to noise. Wetlands and Stormwater Concerns 82. The Petition states the proposed Project will have significant impact on wetlands, noting the Project will increase the impervious area on the Project location from approximately 0.90 acres to approximately 20.85 acres, and disturb an additional approximately 38 acres. The Petition notes that in aggregate, Bituminous proposes 3.55 acres of wetland impact, requiring 6.30 acres of replacement. The Petitioner describes the Bituminous remediation plan that has been submitted to the Rick Creek Watershed District (Appendix C of the Petition, Attachment 1 to the Findings), and that the engineers who have reviewed the plan on behalf of the Rice Creek Watershed District have recommended approval, so long as certain conditions are satisfied. This remediation plan also includes stormwater measures, including design of sedimentation basins, site grading, and other stormwater controls to prevent stormwater impacts. 83. Based on the information in Appendix C to the Petition, and as previously noted in Findings 11 through 17, Bituminous has worked with Rice Creek Watershed District to address the requirements of the WCA, including wetland replacement and stormwater design and management measures. 84. The MPCA reviewed the potential for environmental impacts associated with stormwater runoff during and after construction of the Project, as well as the potential environmental impacts associated with Bituminous’ removal of 3.55 acres of wetland that will require 6.30 acres of wetland replacement. 85. In addition to meeting the Rice Creek Watershed District’s requirements for WCA, Bituminous must also apply for MPCA permit coverage for construction and industrial stormwater activities at the Project site. Bituminous has indicated to the MPCA it will apply for MPCA’s Nonmetallic Mining Water General Permit, which covers construction stormwater activities, as well as stormwater discharges from hot mix asphalt plant production areas, including storage of materials. The Nonmetallic Mining Water General Permit also authorizes wastewater discharge for a limited number of activities that do not result in a discharge to surface waters of the state. See the following link: https://www.pca.state.mn.us/water/nonmetallic-mining-and-associated-activities 86. The Nonmetallic Mining Water General Permit establishes requirements to implement appropriate erosion prevention and sediment control measures, based on site-specific design factors, both during construction and operation of the Project, to mitigate surface water runoff impacts. 87. Bituminous will implement applicable erosion prevention and sediment control measures to mitigate surface water runoff impacts based on site-specific design conditions to ensure compliance with enforceable regulatory requirements of the Nonmetallic Mining Water General Permit. This includes but is not limited to Bituminous’ proposed construction of sedimentation ponds, and grading of both Lot 1 and Lot 2 to direct stormwater into the sedimentation ponds.