4.11. SR 12-21-1998 - Laserfiche WebLink

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iity of River ITEH 4.11. TO: FROM: MEMORANDUM CITY COUNCIL STEPHEN ROHLF, BUILDING AND ZONING ADMINISTRATOR DATE: SEPTEMBER 21, 1998 SUBJECT: FINAL UPDATE ON LAKE ORONO Sediment Removal and Disposal The "Final Excavation Quantities" map attached shows the actual cubic yards of material removed from the various locations in lake. The "Final Disposal Quantities" map shows how many actual cubic yards of sediment were placed on each of the disposal sites. The targeted amount of sediment to be removed from the lake was 109,000 cubic yards. The actual total amount of sediment removed was 120,152 cubic yards. The additional material above the targeted amount was removed from the area where the Elk River first empties into Lake Orono, creating additional room for future sedimentation. This additional sediment removal was able to be accomplished because time and money permitted and alternative disposal sites were able to be found. The various permitting government agencies were also very gracious about allowing alterations to their permits. Some city owned parcels benefited from the disposal of sediment from the lake. Roughly 4,000 cubic yards of material high in organic matter were place on an EDA site south of Highway 10 and will be used as topsoil supplement. In addition, another stockpile of material high in organic matter was disposed of on city park land in the plat of Riverplace. The soil in this plat is fairly sandy and the residents there are free to use the material as a topsoil supplement. Whatever remains of this stockpile after the spring of the year 2000 will be used on the park property itself. The original project included shaving the tops off of several of the sand bars in the lobe of the lake just north of the Highway 10 bridge. The material from these sand bars was to be left in the lake. This work would have constituted some 6,000 cubic yards of grading, however, MPCA denied this portion of the project through their permit. Unfinished Tasks There are a few final items that are still need to be accomplished before the Lake Orono project is totally completed. The following are the unfinished tasks for the project and the estimated time of their completion: · Establishing benchmarks (winter of'99) - Specific locations for monitoring the future sedimentation of lake will be established. 13065 Orono Parkway · P.O. Box 490 · Elk River, MN 55330 · TDD & Phone: (612) 441-7420 · Fax: (612) 441-7425