Agenda - Council - 06/28/2022 - Laserfiche WebLink

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COR Wetland Mitigation Memorandum October 7, 2021 Page 3 3,000 ft2. This appears to be related to a larger area of the Northwest wetland mitigation site, based on the mapping included in the monitoring report that indicates the actual size of the site is larger than what was included in the mitigation plan. A summary of the 2005 planned areas is provided in Table 3. Table 3: Planned Wetland, Stormwater Treatment, and Upland Buffer Areas Charter Site Planned Area (ft2) New Wetland (Shallow Marsh) 71592 New Wetland (Wet Meadow) 17,224 Stormwater Pond 41860 Upland Buffer 27,958 Subtotal 57,634 Northwest Site New Wetland (Shallow Marsh) 26,181 New Wetland (Wet Meadow) 19,819 Stormwater Pond 19,476 Upland Buffer 26,524 Subtotal 92,000 Total 149,634 Vegetation standards are not specifically identified in the background material provided for this review; however, the 2011/2012 monitoring reports includes "Expected Values"for hydrology and vegetation in their evaluation. For the purposes of this analysis, hydrology measurements were not completed, relying instead on the criteria used to meet the criteria used in the wetland delineation. Assumed vegetation standards, which can be evaluated, have been summarized in Table 4. Table 4: Summary of Performance Standards Performance Standard Expected Goal Wet Meadow No. of Native Species 12 Wet Meadow Percent Native Cover 90% Shallow Marsh No. of Native Species 8 Shallow Marsh Percent Native Cover 75% Percent FAC or Wetter 75% Upland Buffer No. of Native Species 15% [Upland Buffer Percent Native Cover 90% Wetland Delineation In order to determine the amount of wetland present, a wetland delineation was completed. The study area was examined on May 21, 2021 for areas meeting the technical wetland criteria per the U.S. Army Corps of Engineers Wetlands Delineation Manual(USACE 1987) and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual:Midwest Region (USACE 2010). The delineation procedures in the Corps Manual(i.e., the Routine Onsite Determination Method), in combination with wetland indicators and guidance provided in the Regional Supplement, were applied for this delineation. Where differences in the two documents occur, the Regional Supplement takes precedence over the Corps Manual.