R2004-61 AUTHORIZING THE EXECUTION OF SUPPLEMENTAL AGREEMENT NO. 3

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• ' i DEPARTMENT OF WATER MANAGEMENT Memorandum No. 2004 — 07 March 30, 2004 TO: Honorable Mayor and City Council FROM: Steve Garman, City Manager John A. Smith, Assistant City Manager for Public Services Keith D. Alexander, Director of Water Management ��/�, v-r SUBJECT: Lake Decatur Basin 6 Sediment Storage Site Engineering Services Supplemental Agreement No. 3 City Project LC 9956 SUMMARY RECOMMENDATION: Council adopt the attached Resolution authorizing Supplemental Agreement No. 3 with Homer L. Chastain and Associates, LLP, (Chastain) at a cost of$64,868.46. BACKGROUND: In September 2000, Council authorized the Lake Decatur Basin 6 Sediment Storage Site Engineering Services Agreement with Chastain. It was not known at that time exactly how much effort would be required to determine the feasibility of City staff performing dredging operations, assist City staff prepare dredging specifications, assist with the evaluation of dredge equipment bids, and provide construction services for the sediment storage and dredge mobilization sites. Presently, the sediment storage site has been constructed, and Chastain has completed their services to the City. Chastain had originally estimated up to $11,412 in services to provide technical assistance for dredge equipment acquisition and training. Chastain and their sub consultant, Dredging Specialists, Inc., did this work, and also performed dredging studies for the lake, traveled to various sites to investigate dredge equipment at the request of City staff, and performed other related necessary services. The second reason for the additional expenses was the result of a permit issuance delay by the U.S. Army Corps of Engineers. This delay resulted in the construction of the sediment starage and dredge mobilization sites to be shut down during the winter of 2002-2003, which significantly lengthened the amount of time necessary to complete construction. Chastain was under contract with the City to provide construction administration, layout, and observation services during construction. However, the original agreement did not include provisions for the winter shutdown and associated additional costs. In total, this supplemental agreement reimburses Chastain $64,868.46 for the above described additional expenses.