These two sanitary sewer mains installed in the 1960's and 1970's initially connected the old Riverside Wastewater Treatment Plant with the Village Creek Wastewater Treatment Plant. Both pipelines are generally aligned parallel to and offset from the Trinity River. The pipelines convey the majority of the wastewater generated in Fort Worth to the Village Creek Wastewater Treatment Plant, with peak flow capacity of upwards of 200 million gallons per day. With the heavy rains and associated flooding in May and June of this year, approximately 300 linear feet of the Trinity River streambank eroded to the point that both sanitary sewer pipelines were in danger of being exposed and undermined. If one or both of these pipelines had leaked as a result of soil movement or loss of soil support, wastewater would have flowed directly into the Trinity River. Sanitary Sewer Overflows are a threat to the health and safety of the City of Fort Worth. Chapter 2, Article I, Section 2-9 of the City's Code of Ordinances and Section 252.022 of the Local Government Code exempts from normal bidding requirements expenditures that are necessary to preserve or protect public health or safety of the municipality's residents; and procurements necessary because of unforeseen damage to public machinery, equipment, or property.
A two part solution was recommended. First, structural piles were driven to support the pipes in the event of further flooding and associated erosion. Second, the Trinity River streambank that has eroded will be permanently stabilized using rock gabion baskets to prevent further erosion. Stabilizing the streambank will require a Corps for Engineers Permit 13, which may take several months to obtain. The Water Department engaged James DeOtte Engineering Inc., to provide the engineering design and permitting services necessary for the structural piles and the permanent streambank stabilization. It is anticipated that construction of the permanent streambank stabilization improvements will be advertised for bid upon receipt of the necessary Corps of Engineers Permit, utilizing the city's normal construction procurement process. The attached City Manager memo dated June 7, 2016, approved the emergency design, permitting and construction work. The total fee to prepare the streambank stabilization design and necessary Corps of Engineers permits was $151,165.00, which is fair and reasonable for the work performed. It was necessary to drive structural sheet piles at two locations 80 feet along the banks off the river to support the pipes in the event of future flooding and erosion. It was beyond the City's ability to perform repairs of this size, length, and depth. The Water Department engaged William J. Schultz, Inc. d/b/a Circle C Construction Company to perform this emergency pipeline and streambank stabilization work. The total construction cost to install the sheet piling was $283,900.65, which is fair and reasonable for the work performed. In addition to the emergency design and construction contract costs, $60,000.00 is required for ongoing project management, soil testing and inspection.
This project was located in COUNCIL DISTRICT 4, Mapsco 65N.
This M&C does not request approval for a contract with a business entity.
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