08-13-2014 Council Agenda - Laserfiche WebLink

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£I111I1% . fSSO(IIITWS TAR 110E11 Memo TO: Honorable Mayor & Members of the City Council FROM: Lee Elfering, City Engineer DATE: August 8, 2014 RE: City Hall Concrete Work We were only able to obtain only a single bid for the concrete work at City Hall and Spooner Park last month. This was most likely due to the short bidding and completion time for the work, but we were also asking for several options for pricing. This required more work on the bidder's part and would have made comparison of multiple bids difficult. The Spooner Park work was completed prior to Canadian Days as desired, but the City Hall work was delayed. We feel this time should be used to better define the City Hall project so more competitive bids can be obtained for completion of the work yet this fall. There are additional costs that are associated utilizing colored and/or stamped concrete. The increased costs of colored concrete on our Little Canada Road project was approximately $4.20 per square foot compared to the standard sidewalk. We have verbally been told to expect the increased cost for coloring for as little as $2.00 per square foot up to $15.00 per square foot depending on the color chosen and the amount of concrete. We feel the Council could expect to see increased costs in the neighborhood of $5.00 to $10.00 per square foot due to the relatively small quantity of the project. We would also point out that the addition of multiple colors would add to the duration of the work. It is likely that we will need to coordinate the pours to be completed after 4:30 on a weekday or on a weekend. If a single color, including standard grey, is used the entrance can likely be all poured at one time. Each additional color would require an additional pour after the previous pour has been allowed to cure. The deterioration of the existing concrete at the entrance to City Hall and the History Center is the most advanced at the control joints of the panels. These joints are necessary to control cracking, but can provide a point of higher potential for deterioration. There is relatively high salt use at the entrance to provide safe pedestrian movement to and from City Hall and the History Center which may attribute to the deterioration being seen, but regardless of the cause the deterioration appears to have started and is the worst at the joints. While stamping of the concrete does not provide as deep a scoring in the concrete as the control joints it could have a similar affect; therefore, we would not recommend stamping the concrete. 10062 Flanders Court NE — Blaine, MN 55449 — (763) 780-0450 fax (763) 780-0452 Z:\PROD\120174E - 2014 Misc. Improvements \Memo -080814 -CC (City Hall Concrete).doc