12/15/2015 (2) - Laserfiche WebLink

Home Browse Search

Consent Agenda;ltem'- INDIAN RIVER COUNTY, FLORIDA DEPARTMENT OF UTILITY SERVICES gP Date: December 1, 2015 To: Joseph A. Baird, County Administrator From: Vincent Burke, P.E., Director of Utility Services Prepared By: Arjuna Weragoda, P.E., Capital Projects Manager A00 Terry Southard, Utility Operations Manager Ift,r.ikW Subject: Wabasso Causeway Re -Use Main Inspection DESCRIPTIONS AND CONDITIONS: The Wabasso Bridge Reuse Main crossing consists of double 12 -inch diameter ductile iron mains hanging under the Wabasso Causeway bridge decks. There are 4 bridge crossings consisting of 3 low elevation structures and a high causeway structure. Together, the total length of exposed pipe is approximately 3,400 linear feet. Since installation, the metal pipes have experienced several small failures, but have had no complete inspection for the weathering process caused by the salty environment. A quick visual view of the hanging pipes indicates the need for such an examination. ANALYSIS: Staff reached out to Carter Associates, Inc. (CAI) to perform this inspection due to their past experience on this very bridge. CAI conducted inspection, design, and bidding services for the 16 - inch diameter cast iron pipe owned and maintained by John's Island currently hanging under the south side of the Wabasso Bridge decks. Since the pipes are hung under each of the bridge decks, access is limited to a mobile platform deck. Rather than using a multi -boom lift crane, which would require drive lane closure for a significant time, CAI has experience on this very bridge, using a rolling scaffold for pipeline inspection. Unfortunately, the inspection scaffold for that project no longer exists. CAI is proposing the same successful inspection technique used on the south side to inspect the County's Reuse Mains located under the north side bridge decks. Therefore, approximately 15% of the cost is attributed to design and construction of the scaffolding. The work order will be provided in accordance with the Extension and Amendment of the Continuing Services Contract Agreement for Professional Services with CAI dated November 4, 2014. The scope is more specifically described in the attached Work Order No.2. The total negotiated cost for the six (6) tasks outlined in Work Order No.2 is a total sum amount of $56,048.42. FUNDING: Funding for the Wabasso Causeway Reuse main inspections are within the Utilities Operating Fund. 132