R2013-74 ACCEPTING THE BID AND AUTHORIZING CONTRACT FOR LAKE DECATUR DAM REPAIRS

Home Browse Search

periods of water going over the dam. The patch performance has provided a good design to continue in the Phase II work. 2. Complete concrete repairs to the sluice gate access platform. Deteriorating concrete at the access platform needs to be replaced. 3. Install an Asian Carp barrier. As previously presented to City Council, this is a heavy duty screen that will be placed on top of the dam behind the bascule gates to keep Asian Carp from jumping into Lake Decatur during high flow conditions. 4. Remove the tail water dam. This is the old dam constructed circa 1906 that is approximately '/ mile downstream of the main dam. The tail water dam was significantly undercut by scour February 2012. A review performed by Hanson recommended that the dam be removed due to the costly repairs required and the limited benefit provided by the structure. Removal will also eliminate all future maintenance and operations expenses necessary for dam upkeep. This work will reduce or eliminate the tail water pool normally maintained below the main dam and restore this section of the Sangamon River to a more natural river ecosystem. 5. Complete scour repairs in the streambed downstream of the dam. The Phase I dam repair work included draining the tail pool which provided Hanson the opportunity to document scour damage downstream of the dam. The scour holes will be filled in and the existing pipelines crossing the river channel bed will be reinforced. Bidding The project plans and specifications were prepared by Hanson Professional Services. The project was advertised on April 24, 2013, and bids were opened on Wednesday, June 5, 2013. The results for the letting are as follows: ....................................... .. .........................................................................................................................,............................ .... Compared to Engineer's Est. .......................................... .............. ....... . Bidder Base Bid Price Qver(-Under) ....................�. Engineering&Construction Innovations,Inc. $4,159,573.00 49.70% ........_..._........._._........................................... ................................................................................................................_................ - ..............._......._...._._.._._...._......... . .....................,................................_.................................................................................. ; Mid-States General&Mechanical Contracting Corp. $5,578,735.00 100.78% _..._._._......._..............._.................__...................................................................................... Global Infrastructure $5,816,664.82 109.34/0 ..................._......_........__........I._......... .--._......._....,..........._.._............._._.._................................_.......................... .............. J F Brennan Company,Inc. $5,898,209.10 112.28% Engineer's Estimate $2,778,531.38 ------- Recommended Award Engineering & Construction Innovations, Inc. (ECI)of Oakdale, Minnesota provided the low bid for the proposed work. The bid was 49.7%over the Engineer's Estimate. The City's engineer, Hanson Professional Services, has investigated ECI's work record and has provided a recommendation that ECI is able to complete the work as specified. Staff recommends that the City Council approve a contract with ECI, to perform the Lake Decatur Dam Repairs Project - Phase II. SCHEDULE: Repair work is expected to commence later this summer and should be completed by summer 2015. Page 12