02-17-2004 Planning Packet - Laserfiche WebLink

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H IQOLHAUG environmental services company fretid'rfScuni, BcUfttd. ACcfn^* /aeunt Selytioni MEMORANDUM DATE: November 6,2002 TO: Mr. Mike Wyatt, Minnehaha Creek Watershed District Tom CuUuro Rachel Igcl, The Wetlands Company Marty Campion, Otto Associates FROM: Mike DeRuyter, Kjolhaug Environmental Services Conqumy RE; No«Lo>8 Determination and Wetland Restoration* Culfum Site The purpose of this memorandum is to describe proposed modifications to a wetland located on the Tom Culhim property located at 785 Femdale Road, in the N ‘/a of the NE '/«of Section 36, Township 118 North, Range 23 West, Orono, Minnesota (Figure 1). The site is specifically identified as Tract B, Registered Land Survey No. 1031, Hennepin County, Minnesota. As described in the attached Wetland Delineation Report, the wetland consists of a Type 5 (PUBGx) pond in the western half of the property, surrounded by mowed Kentucky bluegrass lawn in all directions except to the north aiKl southwest, which is dominated by common btickthom and green ash trees. Based on a review of aerial photographs, the wetl^ appears to have been excavated between 1953 and 1964 (Figure 2), an assessment that was supported by observations of the wetland during the December 14,2001 and June 6,2002 site visits by staff fiom our cfiBce. During these visits, the wetland was olncrved to consist of an open-water pood which had very little emergent vegetation around the edges, and the uplands were mowed to the water’s edge. Water depths in the pond were assumed to be 1 to 2 As shown on the attached grading plan (Figure 3), the applicant proposes to construct a small berm in the wetland along the western property line m order to provide substrate for the establishment of emergent herbaceous and woody wetland vegetation. A break in the berm will maintain the existing drainage of the wetland toward the southwest in order to prevem changes to the pond ’s water level The berm was determined to be necessary because the water depths along the western property line were too deep to allow woody vegetation to become established. The proposed project would reestablish vegetation arouitd portions of the wetland, and partially restore vegetation to the inner portions of the basin. The top elevation of the berm will be no more than 1.0 feet above the normal water level of the wetland; therefore, the project will resuh in no loss of wetland area. Although the project will partially restore the excavated wetland, the placement of 2,135 square feet (si) of ^ material fbr the construction of the berm will be mitigated through the creation of 2,135 sf of new wetland adjacent to the existing wetland, and the establishment of 11,787 sf of native, non-invarive vegetation in permanent upland'buffer surrounding the new and existing wetland. * 26105 Wild Rose Lane, Shorewood, Minnesota 55331 • Phone: 952-401-8757 • Fax; 952-401*8798