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t l <br /> • <br /> AlwArSel <br /> 3535 VADNAIS CENTER DRIVE,200 SEH CENTER,ST PAUL,MN 55110 612 490-2000 800 325-2055 <br /> ARCHITECTURE • ENGINEERING • ENVIRONMENTAL • TRANSPORTATION <br /> October 6, 1994 RE: Mounds View, Minnesota <br /> Miscellaneous Water Resources Services <br /> Review Impacts on Wetland for Propc_;Pd <br /> Trail Crossing of a Local Ditc-. <br /> SEH No. A-MOUND9402.00 <br /> Ms. Mary Sarrion <br /> Parks and Recreation Director <br /> City of Mounds View <br /> 2401 Highway 10 <br /> Mounds View, MN 55112 <br /> Dear Mary: <br /> A site visit was performed at Silver View Park as approved per the letter agreement of <br /> June 22, 1994. The site visit was performed to determine the feasibility of 1) installing a culvert <br /> •at the ditch to complete a trail from Silver View Park to Silver Lake Road, and 2) providing some <br /> runoff detention and water quality improvement behind the proposed crossing was also <br /> determined. This letter report will first describe the results of the site visit and other background <br /> information. <br /> The enclosed figure shows the approximate extent of wetland between the park driveway and <br /> Silver Lake Road. The wetland basin is semi-circular in shape and approximately 1.5 acres in <br /> size. The basin contains emergent vegetation such as cattail and reed canary grass and willow <br /> trees and shrubs. The basin is characterized as a Type 3 wetland, or a palustrine emergent <br /> wetland with seasonal flooding. The wetland is drained by a ditch which drains south and east <br /> to Silver Lake. <br /> According to historic aerial photographs, this wetland was once a circular basin that drained to <br /> Silver Lake via a ditch. The basin was bisected by the construction of Silver Lake Road and the <br /> ditch was reconstructed. The construction of the roadway not only changed the shape of the <br /> wetland into two semi-circles, but also changed the character of the basin. The historical photos <br /> show an basin of open water surrounded by a narrow fringe of emergent vegetation. Today the <br /> western half of the basin is essentially a monoculture of cattails. The eastern half of the basin <br /> is a mixture of cattails and other emergents plants and willow trees and shrubs. The existing <br /> vegetation of the two halves of the basin is indicative of a drier environment than that prior to <br /> the roadway construction. <br /> The wetland habitat at the location of the proposed trail crossing is essentially limited to the <br /> bottom of the ditch itself. There should be no significant difficulties in obtaining approval for <br /> • the construction of the trail crossing and culvert placement. <br /> There will be several agencies to contact with regard to potential wetland impacts, but no <br /> permits or mitigation should be required. The Minnesota Department of Natural Resources has <br /> SHORT ELLIOTT <br /> HENDRICKSON INC. MINNEAPOLIS,MN ST CLOUD,MN CHIPPEWA FALLS, WI MADISON, WI <br />