R2002-172 AUTHORIZING THE EXECUTION OF SUPPLEMENTAL AGREEMENT NO.2

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- • . DEPARTMENT OF WATER MANAGEMENT Memorandum No. 2002-32 August 26, 2002 TO: Honorable Mayor Howley and City Council FROM: Steve Garman, City Manager John A. Smith, Assistant City Manager for Public Services Keith D. Alexander, Director of Water Management �� SUBJECT: Lake Decatur Basin 6 Sediment Storage Site Engineering Services Supplemental Agreement No. 2 City Project LC 9956 SUMMARY RECOMMENDATION: Council adopt the attached Resolution authorizing Supplemental Agreement No. 2 with Homer L. Chastain and Associates, LLP, (Chastain) at a cost not to exceed $92,588. 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, and assist with the evaluation of dredge equipment bids. Chastain had originally anticipated some involvement with these items and had allocated $11,412 to provide technical assistance for dredge equipment and training. The majority of this work has been performed by Don Searles of Dredging Specialists, Inc., at a cost to date of approximately $79,266. Chastain also coordinated subconsultants, performed dredging studies for the lake, and traveled to various sites to investigate dredge equipment at the recommendation of the City. Their cost to date for performing these services is approximately $24,734. Additionally, Council recently authorized a contract with Koester Contracting Corporation for the construction of the sediment storage and mobilization/operation sites. The original agreement with Chastain did not include construction administration, layout, and observation services for this construction, which Supplemental Agreement No. 2 will provide. Therefore, staff is recommending the approval of Supplemental Agreement No. 2 at a cost not to exceed $92,588. This will increase the current agreement not to exceed amount from $848,306 to $940,894.