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Amendment No 2 to PSA - Additional Engineering Srvs. South Well Field Imprvmts. – Donohue & Associates, Inc.
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Amendment No 2 to PSA - Additional Engineering Srvs. South Well Field Imprvmts. – Donohue & Associates, Inc.
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10/25/2022 1:49:10 PM
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10/25/2022 1:48:24 PM
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Board of Public Works
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Contracts
Document Date
10/25/2022
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Page 2 of 6 <br />b.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 />4.Modifications to chlorine feed, mixing and control, including: <br />a.New pre-chlorination vault for adding chlorine to the 16–in. raw water line for breakpoint <br />chlorination upstream of the new contact tank and existing GAC unit. <br />b.Ammonia analyzer for monitoring raw water ammonia concentrations and for chlorine feed <br />control. <br />c.Chlorine residual analyzer for breakpoint free chlorine residual monitoring and chlorine <br />feed trimming control. <br />d.New chlorine residual analyzer for finished water free chlorine residual monitoring and <br />optional trimming control. <br />e.New static mixer in 16-in. finished water line following the final chemical addition. <br />5.Upgraded control programming to execute a breakpoint chlorination and disinfection control <br />strategy using on-line ammonia analysis coupled with an effluent flow signal and a feedback signal <br />from a chlorine residual analyzer. <br />6.New 20-inch finished water main routed west to the abandoned railroad bed, west of the South <br />Well Field, and then south to the 12-in. water line along Ireland Road - serving as a direct <br />distribution line from the WTP and the South Pressure District. Note: Another route may be <br />considered pending the results of the ownership search of the abandoned railroad corridor. <br />A. SCOPE OF SERVICES <br />Design & Bidding Services <br />Deliverables <br />·Proposed water main easement description and exhibit. <br />·Prepare the following deliverables for both Contract A and Contract B bid packages: <br />o Final (90%) Design <br />o Bidding Documents (100%) suitable for public bidding <br />·Coordinate with the Owner to incorporate Owner’s standard front-end specification documents <br />and format. <br />·Prepare specifications using the Construction Specifications Institute (CSI) 50 Division, 3-part <br />format. <br />·Prepare drawings using Donohue CADD standards. <br />·Provide Bidding Documents in the form of .pdf electronic files. Drawings will be 11-in x 17-in size.
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