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� • • <br /> B L A C K & V E A T C H <br /> ENGINEERS-ARCHITECTS TEL. (9131 339-2000 <br /> 7500 MEADOW LAKE PARKWAY <br /> MAILING ADDRESS P.O.BOX NO.8405 <br /> KANSAS CITY,MISSOURI 64114 <br /> Decatur, Illinois April 10, 1990 <br /> Lake Decatur Dam <br /> Additional Services <br /> Mr. Bill Sands <br /> Director of Public Works <br /> City of Decatur, Illinois <br /> No. 1 Civic Center Plaza <br /> Decatur, Illinois 62523 <br /> Dear Mr. Sands: <br /> This proposal to expand the scope of our present work titled an "Evaluation <br /> of the North Embankment and Intake" is based on the discussions during our <br /> meeting at City Hall on April 4, 1990. The items specifically discussed <br /> were: <br /> • Bascule Gate replacement or rehabilitation <br /> • Southside upstream wing wall rehabilitation <br /> • Flood Gate replacement or rehabilitation <br /> • Recently discovered seepage along the outside face of the southside <br /> downstream wing wall <br /> • Erosion and weathering of the concrete on the downstream side of <br /> the Bascule Gates <br /> • Integrity of the previous repairs to the slab which protects the <br /> downstream face of the dam <br /> The product of this additional work will be the development of a long-range <br /> plan and schedule for the rehabilitation work at the Lake Decatur Dam. The <br /> principal features of this additional work will be: <br /> 1. An investigation program to develop the information needed for the <br /> preliminary designs for the rehabilitation work. The investigation <br /> program will include: <br /> A. Speciality contractor underwater inspection and report for the <br /> upstream wing walls at the south side of the dam to determine <br /> the extent of deterioration (cracks, holes or movement) . <br /> B. Speciality contractor inspection and report of the Bascule <br /> Gates. <br />