Agenda - Council - 06/25/2013 - Laserfiche WebLink

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Enterprise Park to Crooked Lake 115 kV Transmission Line March 2012 Environmental Assessment Mitigation — Soils and Geology The Applicant has stated it will restore areas disturbed during construction to their original condition to the extent practicable and to limit ground disturbance wherever possible. Where disturbance and excavation cannot be avoided, it could be minimized using Best Management Practices (BMPs). These may include reseeding of vegetation and use of erosion control blankets and/or silt fence. MnDNR recommends wildlife - friendly erosion control blankets where suitable habitat exists for listed species of amphibians and reptiles. In areas where soils have been compacted, the Applicant could use techniques such as ripping to reduce compaction and avoid future impacts to agricultural crops. Additionally, the Applicant would be required to obtain coverage under the state general permit for storm water discharges associated with construction activities, and to develop a Storm Water Pollution Prevention Plan (SWPPP) prior to the start of construction. The plan is required to outline the BMPs that would be used during construction, especially focusing upon erosion and sediment control. 5.2.3. Water Resources The MnDNR divides Minnesota into six groundwater provinces. All of Anoka County falls within the Metro Province, which is described as sand aquifers in generally thick sandy and clayey glacial drift overlaying Precambrian and Paleozoic sandstones, limestone and dolostone aquifers. The Project area lies within the Rum River to Mille Lacs Watershed Planning Unit of the Upper Mississippi River Basin (Figure 8). The Project crosses the Rum River and its associated riparian ecosystem. Consistent with the MnDNR definition of shoreland zones, the riparian area extends 300 feet from each bank of the Rum River. The Rum River is a Minnesota Wild and Scenic River, as defined in Minnesota Rules Chapter 6105. At the proposed crossing of the Rum River, a Type 7 wetland (Wooded swamp) lies to the north of the Bunker Lake Blvd/CSAH 116 bridge and road crossing. Tree clearing in this area would result in impacts to this wetland. The Project also crosses the Rum River floodplain. The Project will require a United States Army Corps of Engineers (Corps) permit under Section 10 of the Rivers and Harbors Act because the transmission line will cross the Rum River, a navigable water of the United States. There are no lakes greater than 10 acres in the vicinity of the Project, so there are no riparian areas associated with lakes. The Rum River is listed as impaired for mercury in the MPCA's draft 2010 list of impaired waters. Section 303(D) of the Federal Clean Water Act requires states to publish, every two years, a list of streams and lakes that are not meeting their designated uses because of excess pollutants (impaired waters). The list, known as the 303(d) list, is based on violations of water quality standards. In Minnesota, the MPCA has jurisdiction over determining 303(d) waters. These waters are described as impaired. 44