R2004-114 AUTHORIZING THE EXECUTION OF TASK ORDER NO. 4

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ATTACHMENT A FOR TASK ORDER NO. 4 FOR CONTINUING AGREEMENT FOR ENGINEERING SERVICES Owner: City of Decatur, Illinois Engineer: Black& Veatch Corporation Project: Chlorine Feed System Improvements Date: August 2, 2004 DESCRIPTION OF SCOPE OF SERVICES The Project will be conducted in phases. Phase 1 of the Project was a feasibility study to evaluate various alternatives to improve the safety of the existing chlorine storage and feed system. Phase 2 will include Design, Construction Contract Documents, Bid and Preconstruction Services. Work under Phase 2 will start on execution of this Task Order No. 4, and work under any other phase will proceed only after Owner has authorized Engineer in writing to proceed. The scope of services for Phase 2 is as follows. PHASE 2, DESIGN, CONSTRUCTION CONTRACT DOCUMENTS, BID, AND PRECONSTRUCTION SERVICES. Phase 2 shall consist of the design, development of construction contract documents, and bid and preconstruction services for the following improvements to the existing chlorine storage and feed facilities at the South Water Treatment Plant: Convert the existing pressurized liquid withdrawal system to an all vacuum withdrawal system with vacuum regulators mounted directly on the chlorine ton containers. New vacuum regulators will be mounted on a maximum of eight containers to provide a feed rate of up to 1,500 pounds of chlorine per day. A total of four scales with two containers per scale will be provided for two banks of containers with four containers per bank (one bank of four"on- line" containers and one bank of four"standby containers). Other improvements will include installation of a dry chlorine scrubber with sufficient capacity to neutralize a single one-ton chlorine container, and removal of unnecessary existing chlorine feed equipment and the existing aqua ammonia tank in the area where the new scrubber is proposed to be located. A-1 City of Decatur Task Order No.4 Rev.07-13-04