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' B L A C K & V E A T � • <br /> City of Decatur, Illinois 2 April 10, 1990 <br /> Mr. Bill Sands <br /> C. Coring, sampling and testing of the top and downstream surface <br /> of the dam to determine the nature and extent of the <br /> deterioration and weathering. <br /> D. Concrete coring through the concrete slab downstream of the <br /> dam to determine if the previous repairs, to stop the <br /> undermining of the slab, remain successful. <br /> 2. Defining and conceptual designs for the rehabilitation including <br /> opinions of construction costs and construction phasing. <br /> 3. A report which consolidates the investigation work, opinions of <br /> construction costs and construction phasing and provide the City <br /> with 10 copies of the final report. <br /> The additional work is anticipated to require 6 to 8 weeks to complete <br /> following authorization to proceed. Due to nature of this work, the schedule <br /> may have to be adjusted accordingly but every reasonable effort will be made <br /> to achieve this schedule. <br /> The additional services described in this agreement will be invoiced at a <br /> direct salary multiplier of 2.68 plus direct expenses which include invoices <br /> from subcontractors providing the concrete coring and testing and specialized <br /> inspections. The billing limit for the work will not exceed $50,000 without <br /> additional authorization. <br /> Please call me if you have any questions. If you are in agreement with the <br /> above, please sign both copies of this letter and return one to us. <br /> Very truly yours, <br /> BLACK & VEATCH <br /> �:=%:"�.,�,yt �f ���'''�v <br /> Len C. Rodman, P.E. <br /> Partner <br /> lj <br /> cc: Chandra Russell <br /> Jim Mayhugh <br /> CITY OF DECATUR, ILLINQIS <br /> ��� � <br /> � C� � <br />