Explanation
1. BACKGROUND
This ordinance authorizes the Director of Public Utilities to enter into a contract modification for professional engineering services with Brown and Caldwell for the Scioto Main Sanitary Pump Stations Project, CIP #650886-100000, in an amount up to $76,047.20.
The purpose of this project is to provide structural modification to West Columbus Local Protection Project (WCLPP) hydraulic components to improve the overall operation of key components of the WCLPP during Scioto River flood events. Work includes specialized engineering investigations; making recommendations; performing detailed engineering calculations; performing Large Diameter Sewer Condition Assessment of the Scioto Main Trunk Sewer; preparing construction plans and specifications for the rehabilitation of Scioto Main Trunk Sewer manholes to provide localized protection to mitigate water in basement (WIB) occurrences at previously identified locations; and designing and preparing detailed plans and specifications.
The consultants have completed the field survey and the condition assessment, and submitted their recommendation to rehab the Scioto Main Sewer-Middle section and to modify the design of the McKinley overflow structure. Future work includes preparing the construction plans and specifications, easement documents, bidding documents, and consultant services during construction.
The Scioto Main Trunk Sewer- Middle section begins at Griggs Reservoir and continues south to West Broad Street, a distance of approximately 26,000 feet of 84 inch and 90 inch sanitary sewer. The general project boundary is the middle section of the Scioto Main Trunk Sewer and tributary sewers starting just south of Griggs Dam and then proceeding in a southerly direction to West Broad Street.
In November 2017, Brown and Caldwell (BC) submitted the preliminary design for the Scioto Main Middle Section. The 2017 recommendations aimed to protect the system from the over 30 feet of int...
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