2005-01-27_AgendaPacket - Laserfiche WebLink

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Furniture. This ditch is part of the old County Ditch 16 system. Modification of the ditch with detention areas for water quality benefits is planned. Wetland impacts would be limited to the excavation of a connecting ditch from the south edge of the wetland connected to West Vadnais Lake, to the_pipe and apron outlet. The cross section of the connecting ditch would be four feet wide at the 881.9 (1988 datum) bottom elevation with 1:5 side slopes. Approximately 100 square feet of the ditch excavation would be within the West Vadnais Lake DNR protected waters as determined by the ordinary high. water elevation, and this impact would be covered under the DNR permit. A WCA permit from Vadnais Lake Watershed. Maintenance Organization has been granted for another approximately 620 square feet of excavation for the ditch within a fringe wetland on the south edge of the West Vadnais Lake. This impact would be compensated for by approximately 1400 square feet of additional ditch excavation on adjoining upland. There would also be approximately 100 square feet of excavation within DNR waters within the OHW of West Vadnais Lake. The DNR does not require replacement for this excavation impact. A DNR permit will be required for the project. The entire constructed 150 foot long ditch would be below the OHW elevation of West Vadnais Lake acid would thus when completed would become DNR protected waters. Construction of the project would occur between April 1, 2005 and November 30, 2006. 6. PROJECT ALTERNATIVES The no-build alternative is not considered feasible because it would not solve the high water level problem on West Vadnais Lake caused by the outlet blockage and would not provide a necessary downstream outlet for the lake. An alternative outlet for West Vadnais Lake would be to reestablish the connection to Twin Lake. However this alternative is not desirable because the existing exceptionally good water quality of Twin Lake would suffer as a result. 9. STATUS OF OTHER APPROVALS Permits for this project are required from the Minnesota DNR, Vadnais Lake Area Watershed Management Organization (VLAWMO) as LGU for the Wetland Conservation Act, and the Army Corps of Engineers. The purpose of this Joint Notification form is to request these approvals. Reviews, approvals, planning and/or funding for this project are in process with Grass Lake WMO, Minnesota Department of Transportation (Mn/DOT), Ramsey Washington WMO, City of Vadnais Heights, City of Little Canada, and City of Shoreview, and St. Paul Regional Water Authority. 15. DESCRIPTION OF REPLACEMENT WETLANDS CONSTRUCTION