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CONSIDERATION OF THE RATIFICATION OF THE DECLARATION OF EMERGENCY REPAIRS IN THE AMOUNT OF $119,476.26 TO STABILIZE THE BANKS OF IMHOFF CREEK DAMAGED BY HIGH STORMWATER FLOWS AT THE 42-INCH WESTSIDE INTERCEPTOR SEWER CROSSING AND AUTHORIZING THE CITY MANAGER TO TRANSFER FUNDS IN THE AMOUNT OF $22,504 FROM THE FYE17 SEWER MAINTENANCE PLAN CONSTRUCTION ACCOUNT.
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BACKGROUND: The existing 42-inch Westside Sanitary Sewer Interceptor crossing of Imhoff Creek was completed in December 2007. The top of the sewer crossing was constructed slightly above the flow line of Imhoff Creek and was encased in concrete to prevent damage from debris floating down the creek during high flow events. The sewer crossing causes water to pond at a depth of about two feet upstream of the crossing.
In early August 2016, Norman Utilities Authority (NUA) staff discovered that stream flows had caused severe damage to the bank on east side of Imhoff Creek adjacent to and downstream of the concrete-encased sewer crossing. The washout had exposed three 14-foot joints of 42-inch Polyvinyl Chloride (PVC) sewer pipe which needed immediate repair to prevent further erosion and possible catastrophic failure of the sewer line. The 42-inch Westside Interceptor sewer delivers approximately 3 million gallons per day (mgd) of untreated wastewater to the Water Reclamation Facility (WRF).
Staff contacted and met with Urban Contractors, LLC (Urban) at the site regarding the repairs. On August 8, 2016, Urban submitted an estimate of $113,955 to complete the work. Since this amount was in excess of the $50,000 amount allowed without NUA approval, staff directed Urban to only proceed with efforts to minimize further erosion and prevent failure of the sewer. This work was complete on August 29, 2016 at a cost of $12,530.
In order for competitive bidding requirements to be waived under the Oklahoma Public Trust Act (60 O.S. s. 176), the Trustees of the NUA need to make a "finding" that an immediate...
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