2002-055-RES ACCEPT PROPOSAL OF CARTER & BURGESS FOR PROFESSIONAL ENGINEERING SERVICES TO WATER LOST AND UNACCOUNTED FOR STUDY IN CITY'S WATER AND ACCOUNTING AND OPERATING SYSTEM

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I I I I ! ! I I ! Proposal Comprehensive Water Distribution System Audit " . ! J i e 4 The master meter measures the flow of water through the 12-inch pipelines. The project will include about 700 feet of line along Texas SH 114 and about 2,300 feet of water line inside the development. The master meter uses a SCADA System, which transmits signals from the master meter to the city of Fort Worth to inform water department employees ofthe amount of water flowing through the water lines. The SCADA system transmits to the central facility information concerning chlorine residual, temperature, pressure and flow. Lake Fork Pipeline Dallas, Texas Carter & Burgess is designing 26 miles of 108-inch raw water transmission line for Dallas Water Utilities. The line has a hydraulic capacity of 216 MGD and will run from the lake Fork Pump Station on the western shore of lake Fork to the vicinity of the Iron Bridge Pump Station on the west shore of lake Tawakoni. The scope of services includes hydraulic design, alignment selection, right-of-way document preparation and acquisition services, surge analysis and on-site construction representation. Lake Palestine Water Utilization and Pipeline Alignment Project Dallas, Texas Carter & Burgess performed detailed utilization and alignment studies to develop preliminary plans for a 120- MGD raw water intake and pump station at lake Palestine, more than 85 miles of 84-inch raw water pipeline and associated appurtenances from lake Palestine to Dallas, and the 300-MGD Southeast Dallas Water Treatment Plant, the pipeline's terminus. The assignment involved preparation of preliminary hydraulic designs; alternate route Carter ::Burgess studies and site selection for the water treatment plant and the raw water intake/ pump station; alternate route studies for conveyance facilities; selection of ' final alignment for the raw water pipeline; right-of-way surveys; preparation of cost estimates for system construction, operation and maintenance; and preparation of a milestone schedule for implementi ng the development of lake Palestine as a water supply source for the City of Dallas. Carter & Burgess is also part of a team preparing final geometric alignment and easement documents for right-of-way acquisition of over 180 parcels over the 85- mile project length. Lake Tawakoni Pipelines Dallas, Texas In addition to upgrading the Iron Bridge Pump Station, Carter & Burgess was responsible for performing condition assessments for the existing 15 miles of parallel 72- and 84-inch water transmission mains from lake Tawakoni to the Towakoni Balancing Reservoir. The staff performed physical inspections of the interior of both lines and the evaluation of various alternatives for long-term cleaning of the pipelines. The pipeline cleaning options included continuous chemical disinfection with liquid chlorine and hypochlorite, periodic shock chlorination, and mechanical ("pigging") cleaning methods. The importance of the pipeline cleaning cannot be over stated, since a rapid increase in pipeline roughness occurs if chlorination is terminated. The increase in friction, which results in lower C-values, dramatically increases power costs for pumping. The project also included extensive hydraulic analysis ofthe existing pipelines, performing surge anolysis on the lines, revising the design ofthe surge protection equipment, and computer modeling of the lines in conjunction with the Iron 8 .