Laserfiche WebLink
r Zoning File #1962 <br />September 15, 1994 <br />Page 2 <br />O - Spillway Sketch <br />P - Excerpts from Engineering Calculations <br />Q • Outlet Structure Detail <br />R - Soil Borii^ Excerpts <br />S • Letter from Miimehaha Creek Watershed District <br />T - Letter from DNR <br />U • Letter from City Ei^inecr <br />V - Sepek Diagram. 825 Old Long Lake Road <br />W • Excerpts, 1974 Orono Surface Water Management Plan <br />About the F.xfatfan Wetland <br />• This 'Zetland was qsjI delineated in the City’s 1974 wetland inventory mapping. <br />However, becaute it appears on the USGS map (Exhibit M) staff would argue that <br />it u protected under S^tion 10.55, Subd. 5(A). <br />• Mapped as "wooded marsh" on USGS topographic maps. <br />• Mapped as "PFO 1C (Palustrine forested broadleafed deciduous seasonally flooded <br />wetland) on the National Wetlands Inventory maps. <br />• PFO 1C is typical of a Type 7 wooded swamp wetland type. <br />• Area of this wetland is approximately 10-12 acres. <br />• Applicant’s soil borings indicate the wetland conuins peat and muck ranging to a <br />depth of 30’. <br />• The wetland is in mid watershed of a scries of connected wetlands lying generally <br />north of the Luce Line, cast of Highway 12, west of RuAnn Road, and lies both <br />north and south of Old Long Lake Road. A small portion of the Linda Wood area <br />of Long Lake also drains into this wetland. <br />• Orono’s 1974 Surface Water Management Plan inventories this subwatershed as <br />"LL12" with a total subwatershed area of 185 acres. The subwatershed contains <br />approximately 94% ol the required stormwater quantity storage. Of greater concern <br />is the fact that the portion of watershed upstream from Dayton’s driveway (LL12A) <br />contains only 77% of the phosphorus assimilative capacity required based on the <br />calculated pollution potential (more on this below).