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

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City of Decatur ■1�1 Garages B & C Restoration A Project Cost Overruns May 24, 2012 represents a quantity increase of four times the original repair area. This effect can be magnified as ever-growing areas of deterioration provide additional avenues for water infiltration. 2. Garage B has been the subject of numerous prior repair programs leaving behind numerous areas of slab patching. Previous patches are generally more susceptible to deterioration due to the bond between the new patch material and the existing substrate. Repairs within existing patches often result in full or significant additional removal of the entire patch, not just the deteriorated section. Not only is the bond line subject to failure, the material discontinuity between the patch and adjacent concrete can result in accelerated deterioration of concrete adjacent to the patch. Although we did anticipate some additional quantities due to prior patch failure, there was much more than we had projected as many patches that appeared sound became debonding during demolition of adjacent areas. 3. Patches above the steel beams and along the embedded conduit tended to grow significantly from the survey quantities. This is likely the result of a combination of the first two contributors of time and previous patching. Cracks were noted along the embedded conduit between previous patch areas. Although treated, these cracks will allow moisture in over time, causing deterioration along the length of the conduit. Water leaking above the steel beams will penetrate along the length of the beam top flange, causing debonding and concrete deterioration. More and larger patches were found along the conduit and above the beams during the course of the project to-date. It should be noted that, while there is the potential for additional changes in final quantities as Golf wraps up work in Garage B and begins work in Garage C, the risk for significant cost increase is NOT considered to be high. This is based on the initial concrete soundings in Garage C by Golf, as well as the fact that the major cost items in Garage C have fixed quantities determined by geometry (e.g. expansion joints and deck coating) meaning that for those items there is little potential for quantities to increase. Please feel free to contact me if you have any questions regarding the above, or require any additional information. Sincerely, Carl Walker, Inc. Pat Martin, P.E. Director of Restoration cc: John Kennedy, P.E. Richard Marley, P.E.