Explanation
1. EXPLANATION:
This legislation authorizes the Director of Public Utilities to execute a professional engineering services contract modification with DLZ Ohio, Inc., in connection with the Olentangy-Scioto Interceptor Sewer (OSIS) Augmentation and Relief Sewer Project. This project will design and construct a large diameter conduit that will convey combined sewer overflow (CSO), along a general alignment beginning in the vicinity of I-670 and Neil Avenue, traveling south along the Scioto River to the location of the Jackson Pike Wastewater Treatment Plant.
This project was originally planned to be designed and constructed in four consecutive phases through separately procured contracts. The original scope of services for this contract required the consultant to form and convene a Value Engineering Study for the preliminary engineering report. This study, completed in the Fall of 2006, reviewed and analyzed the alternative construction methods for the project, and recommended that the project be constructed using deep sewer tunnel technology, due to this alternative's significant cost savings to the City. The report also recommended that the City incorporate the detailed design of all four phases of the tunnel into one contract. The tunnel technology was recommended as a risk and cost reducing alternative.
This contract modification will reallocate the remaining funds of the existing contract balance for purposes of undertaking the revised scope of services that will utilize deep tunnel construction methods for all four phases. The modification will include a provision for keeping the local professional engineering consulting firms of EMH&T, Inc.; CH2M Hill, Inc.; Prime Engineering, Inc.; and Dynotec Engineering, Inc., as subconsultants, all of which were part of the original contract.
Division of Sewerage and Drainage engineering personnel anticipate submitting a subsequent contract modification in the fall of 2007 for purposes of a...
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