Explanation
1. BACKGROUND: This legislation authorizes the Director of Public Utilities to enter into a professional engineering services agreement with Stantec Consulting Services, Inc., in the amount of $950,000.00, for the Hap Cremean Water Plant (HCWP) Sludge Disposal Line Improvements - Field Locate/Air Release Valve (ARV) Project, Division of Water Contract No. 1149 - Part III.
The HCWP Sludge Disposal Line was constructed in 1979 and transports process residuals (lime and alum sludge) from the HCWP to the McKinley Quarry for disposal. The sludge line has experienced recent lime slurry releases from various valves on the line. The 17.4 miles - 12 inch ductile iron pipe was originally constructed outside paved road areas but due to various road widening projects during the life of the line, much of it is now within pavement and many of the valve vaults have been covered by pavement and are inaccessible.
This project will establish a system that will allow City staff to accurately field locate the HCWP sludge disposal line and appurtenances. This project will specifically determine the location of all buried air release valves, inspect and determine the operability of said valves, and perform a hydraulic study to determine which valves are necessary for proper operation of the line. This project will design improvements to the line to properly abandon any unnecessary valves and design any necessary upgrades to the valves and vaults. A future contract will construct the improvements.
The selected professional service firm will provide: field reconnaissance; identify valve and vault locations; records research; determine if the line is within existing right-of way and easements; field survey; verify locations of the line and placement of line locating devices and markers; condition assessment; estimate remaining useful life of the sludge line; hydraulic modeling; verify the need and locations for pressure relief valves; detailed design; prepare bi...
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