R2012-126 AUTHORIZING CHANGE ORDER NO. 1, GOLF ACQUISITION GROUP, LLC

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* P . mnewell@decaturil.aov May 29, 2011 Matt Newell, P.E. City Engineer City of Decatur Public Works Department 1 Gary K. Anderson Plaza Decatur, IL 62523 Re: Parking Garage Repair Project Cost Overruns Cad Walker, Inc. Project R 1-2011-482 Dear Matt: This letter is in regard to the repair work in-progress at Garage B, as well as work scheduled to be performed at Garage C. There is currently a considerable cost-overrun, primarily due to an increased quantity of slab repairs identified during the course of the work. The following is a summary of the project to-date along with an explanation of the causes of the quantity overruns. In our evaluation report, dated December 2009, Carl Walker, Inc. made recommendations for various repairs to Garages B and C totaling $1,270,870 and $1,084,765 respectively for a total cost of $2,355,635. The project was contracted to Golf Construction for a scheduled value of $1,656,176 which, with minor exceptions, included the scope originally recommended in the Car(Walker report. The primary differences between the original cost estimate and the bid amount related to very competitive pricing submitted by Golf Construction for the concrete repair and deck coating line items. As of the latest updated survey, prepared by Golf Construction on Monday, May 21 and reviewed by Carl Walker and City Engineering Staff, there are projected adjustments in the various unit price repair item quantities that will result in a total project cost increase of$400,550. The change is primarily due to additional quantities of slab and joist repair identified in Garage B. The current projected quantities for these items have increased from the bid quantities of 1,200sf and 501f respectively to projected quantities of 8,000sf and 3001f. Given the discrepancies, we have reviewed the slab and joist repair bid quantities in order to better understand the increase. The joist quantity increase was primarily due to the replacement of the failed joist along the inside face of the roof level ramp. Although apparently sound along the exterior when struck with a hammer, it was found that the interior of the joist had experienced significant freeze-thaw damage along its length and required replacement. This also required the replacement of the curb above in order to perform the repairs. We believe there are three primary contributors to the slab repair quantity increase as follows: 1. The Engineer's survey was performed in the summer of 2009, almost three full years before the repair work commenced. During this interim period, there was on-going concrete deterioration of the structural elements, causing existing areas to grow and additional areas to form after the survey was completed. For example, if a 1'x1' repair area grows to 2'x2', it I :'� n;l ^:•�� 63('. 7:'O www.carlwolker.com