08-14-2017 Council Packet - Laserfiche WebLink

Home Search

SECTION III Natural Resources Revolving Fund Plan City of Lino Lakes WSB Project No. 2988-470 Page 6 Lake. The channel would consist of an approximately 30-foot flow area and adjacent floodplain. Based on a review of available historic aerial photographs (1991 – 2016), soil data, National Wetland Inventory, contours, and a field review it is anticipated that approximately 31 acres of wetland exist within the site. Some of these wetlands (approximately 1.15 acres) have been farmed since at least the 1960s, and would have potential to be restored vegetatively. It is also anticipated that approximately 11 acres of wetland could be created as part of the drainage improvements. These areas would be located along the channel, in created floodplain. Based on a 50-foot buffer, approximately 14.5 acres of upland buffer would be converted into a buffer consisting of native upland vegetation. Additional buffer credit could be available up to 25% of the total wetland acreage (8.83 acres total). In addition to wetland banking, Peltier Lake has been listed by the MPCA as impaired for nutrient/eutrophication and biological indicators and has an approved TMDL plan for mercury in fish tissue. Conversion of Site 2 from agricultural to wetland/upland and improvement to the drainage channel would help to improve water quality within Peltier Lake. Also, portions of the site are within 100-year floodplain, and volume banking of the additional flood storage created by the channel may be possible. Table 2 below summarizes the anticipated credit potential of a wetland bank at Site 2. Table 2: Summary of Wetland Bank Credit Potential (Site 2) Area (acres) WCA/RCWD Category Percent Eligible WCA Credit (acres) ACOE Category Percent Eligible ACOE Credit (acres) 1.15 1 50 0.58 1 50 0.58 11 2 75 8.25 2 50 5.50 14.5 6 25 3.6 6 25 1.52 Total Credits 12.43 7.60 Estimated Sale Potential* $210,394 (for non-ACOE credits) $662,112 Category Definitions 1 – Vegetative Restoration/Enhancement 2 – Wetland Creation 3 – Restoration of Drained or Filled Wetlands/Re-Establishment 4 – Restoration of Partially Drained or Filled Wetlands/Rehabilitation 5 – Restoration and Protection of Exceptional Natural Resources Value 6 – Upland Buffer (not to exceed wetland credits) * Estimated Sale Potential based on an average $2/sf selling price for ACOE-banks in Anoka County and $1/sf for non-ACOE banks Proposed drainage improvements are expected to result in approximately 7 acres of wetland impact. These impacts will be replaced at a 2:1 ratio, for a total replacement of 14 acres. If onsite replacement is proposed, excess credits for banking may not be available. Site 3: Site 3 (Otter Lake) is in the southeast quarter of Section 36, Township 31N, Range 22W, at the northeast end of Otter Lake (Figure 8). Site 3 is 56 acres in size and is a mixture of wetland and woodland. The site consists of two parcels that are currently owned by the City. The site was identified as having medium to low restoration potential and is located within the Greenway System and Wetland Preservation Corridor. The area was also identified as a High Priority Wetland Area in the City’s Resource Management Plan. Site 3 currently consists of 46 acres of wetland that is categorized as alder swamp, shrub-scrub wetland, and shallow marsh. The surrounding upland areas consist of oak woodlands. The site had been identified by the Minnesota County Biological Survey as a Native Plant Community and a Site of Moderate Biodiversity Significance and was mapped as a Regionally Significant Ecological Area by the DNR. In addition, a tamarack swamp has been identified approximately 0.25-mile northwest of the site. It is anticipated that Site 3 has qualities that would make restoration and preservation of the area eligible for credit as an “Exceptional Natural Resource