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• REQUEST <br /> The City of Elk River is requesting a conditional use permit to excavate approximately <br /> 115,000 cubic yards of sediment from Lake Orono and dispose of it on sites adjacent to <br /> the lake. <br /> A conditional use permit is required for the described work by Section 900.31 of the City <br /> of Elk River Code of Ordinances titled, Excavation, Grading and Filling. Subsection 5 of <br /> the referenced ordinance requires a conditional use permit to excavate in any wetland that <br /> encompasses more than one parcel. In addition, the extraction of materials in the <br /> floodway and the disposal of more than 1,000 cubic yards of material in floodfringe also <br /> requires a conditional use permit (Section 902 of the City of Elk River Code of <br /> Ordinances titled, Floodplain Management Ordinance). <br /> ATTACHMENTS <br /> • Lake Orono Sedimentation and Water Quality Study, October, 1997. <br /> • Lake Orono Improvement Project Environmental Assessment Worksheet (EAW). <br /> • Map #1 - sediment deposits as determined by aerial photos taken in October of 1997 <br /> with the lake water level lowered. Map #1 also shows the proposed excavation areas. <br /> • Map #2 - lake map identifying areas of the lake consider for improvement. <br /> • Map #3 -vicinity map of the proposed disposal sites. <br /> • Map A- Wapiti Park Camp Ground disposal site. <br /> • • Map B - Bickman property disposal site. <br /> • Map C - Hartman property disposal site. <br /> • Map D - Orono Cemetery disposal site . <br /> • Map E - Island View Property disposal site. <br /> • Figure #1 - estimated project cost <br /> • Figure #2 - Proposed project time frame. <br /> LAKE STUDY FINDINGS <br /> Water Quality <br /> Contaminates - Sediment samples were analyzed for heavy metals, pesticides, <br /> herbicides, PCBs, semi-volatile organic compounds and other substances (see <br /> page #3 of the attached study). No significant levels of these materials were <br /> found in the sediment of the lake. This is significant both as a public health issue <br /> and as far as the disposal of the material proposed to be dredged from the lake. <br /> Phosphorus - Phosphorus levels in Lake Orono are fairly high when compared to <br /> other lakes, but they are not high for a river system. The phosphorus levels <br /> observed are not surprising for a hardwood forest river like the Elk River. Leaves <br /> falling into the river and lake alone can significantly raise the phosphorus level. <br /> 11111 <br />