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LRRWMO Meeting Minutes January 20, 1994 Page 4 will also be working with the Army Corp of Engineers, PCA, and other State agencies. The City has hired Peter Fisher, a registered engineer, to comment on the impact of removing the shoal. Brandenburg reviewed data prepared by Hakanson-Anderson Engineering showing the centerline profile with channels as they exist to determine how much material needs to be removed. He also reviewed across-section diagram and explained they would like to excavate to an elevation of 827.2 (6" to 12" of material would be excavated). Brandenburg noted they have submitted two alternatives: one with a 40 foot channel and the other with a 25 foot channel to minimize the impact. The 25 foot channel would require excavating 160 cubic yards of material, and the 40 foot channel would require excavating 292 cubic yards of material. He reviewed pictures of the River and commented one of the DNR's concerns is the possibility of a negative impact on the bedthick community and flood plain area. Brandenburg pointed out the stone castle island (832 elevation) which the PCA suggested could be used to place material around. Brandenburg commented on the difficulty in determining the timing for this project since it needs to be scheduled to coincide with placement of boards to provide more time to operate in the River. Jankowski suggested this item be tabled so the LRRWMO can review comments submitted by other permitting agencies who will define areas of concern and make comments on the construction operation needed to minimize impact. He asked when Brandenburg expects to receive comments from the DNR and Corp of Engineers. Brandenburg estimated that the PCA will be responding in approximately 45 to 60 days. Schultz questioned the river bottom material and asked if this operation is far enough away from the piers so no damage results. Brandenburg stated the bottom is a sand and light gravel mixture and they. do not anticipate damage to the piers. He explained they may contract this project out, depending on the option selected. They anticipate using a trackhoe which requires a skilled operator. Jankowski asked if a dragline could be used. Brandenburg explained why a trackhoe would be better and estimated there would be at least 30 truck loads of material to be removed which could damage the riverbank if they are required to remove it from the area. Weaver questioned the impact of delaying this request until a response is received from other agencies. Brandenburg explained they will have to wait 60 days for the PCA response so he will need a response from the LRRWMO by April. Schultz pointed out the boards are usually not in place until June, depending on the-weather. Jankowski commented that this project only involves 160 to 200 yards of material, which is small in scope but may stir up a lot of sediment in the River.