R2002-92 AUTHORIZING THE EXECUTION OF CHANGE ORDER 11

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..� . DEPARTMENT OF WATER MANAGEMENT Memorandum No. 2002-14 May 06, 2002 TO: Honorable Mayor Howley and City Council FROM: Steve Gannan, City Manager John A. Smith, Assistant City Manager for Public Service Keith D. Alexander, Directar of Water Mana ement '� Rob S. Shirley, Water Production Manage�,l, , SUBJECT: . South Water Treatment Plant Nitrate Removal Facility- City Project 9953 Change Order No. 11 SUMMARY RECOMMENDATION: City staff recommends Council adopt the attached Resolution authorizing Change Order No. 11. ' BACKGROUND: ! City staff and the City's engineering and construction consultant for this project, Black & Veatch, Inc., recommend approval of the attached change arder at a cost of $91,166. With approval of this change order, the total construction change order amount to date is $140,750, which is 2.3% of the original construction bid. For similar projects, the average procurement and construction contingency is 3.8%. Council approval is required since the change order is in excess of$5,000. Illinois Environmental Protection Agency approval is also required since the change order is in excess of$25,000. The change order items are: Item Description A Security camera added to nitrate removal facility exterior. B Electric conduit specifications changed from galvanized steel to PVC coated steel. C Nitrate analyzers modified. D Feed pump pressure switches added and operator controls modified. E Flowmeter, vault and items required for flowmeter relocation. F MV transformers modified for second standby(emergency) diesel generator. The total cost of Item E is $39,516. Some of this cost could have been avoided if the work had been included in the original construction documents. Therefore, Black & Veatch has agreed to contribute $20,060 toward the cost of Item E. The contribution will consist of a $20,060 credit on the next Black & Veatch construction phase services invoice received by the City for this proj ect.