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TASK ORDER #04 TO <br />CONTINUING PROFESSIONAL SERVICES AGREEMENT <br />Between Board of Public Works, City of South Bend, Indiana (Owner) <br />and <br />Donohue & Associates, Inc. (Donohue) <br />Date of Original Executed Agreement: August 8, 2017 <br />Task Order #04: South Wellfield, WTP and Distribution System Improvements Design <br />This Task Order includes engineering services for the design, bidding, easement acquisition and <br />construction assistance of the proposed improvements to the South wellfield, water treatment plant and <br />distribution system, as described in the Needs Assessment Report produced through Task Order #01 and <br />#02. The major Project improvements include: <br />1. Removal of existing pumps and motors in Well No. 4A and Well No. 5, and replacement with new <br />pumps, motors and VFDs sized to provide the pressures required for direct supply into the South <br />Pressure District, The design of the upgrades will include pump sizing and selection, <br />2. Modifications to the Chlorine Room necessary to accommodate the following: <br />a. Increased chlorine storage to three, 1-ton cylinders. <br />L Installation of a supplemental chlorine feed system — consisting of vacuum regulator, <br />automatic chlorine gas feeder panel, ejector, and booster pump —to increase the total <br />instantaneous chlorine, dosing capacity. <br />c. 'Upgrades to the exhaust ventilation capacity to provide 60 air changes per hour <br />(approximately 5,000 cfm). <br />3. Modifications to chlorine feed, mixing and control, including: <br />a. New 1pre-chlorination vault for adding chlorine to the 16—in. raw water line for breakpoint <br />chlorination upstream of the CAC contactors, <br />b. New static mixer and vault on the 16-1n. raw water line within at the point of initial chlorine <br />addition. <br />c. Ammonia analyzer for monitoring raw water ammonia concentrations and for chlorine feed <br />control. <br />d. Chlorine residual analyzer for breakpoint free chlorine residual monitoring and chlorine, <br />feed trimming control. <br />e. New chlorine residual analyzer for finished water free chlorine residual monitoring and <br />optional trimming control, <br />f, New static mixer in 16-1n, finished water line following the final chemical addition. <br />