City of Columbus - File #: 1651-2015

• File #: 1651-2015
• Version: 1
• Type: Ordinance
• Status: Passed
• File created: 6/15/2015
• In control: Public Utilities Committee
• On agenda: 7/20/2015
• Title: To authorize the Director of Public Utilities to enter into an agreement for professional engineering services with Brown & Caldwell Ohio, LLC for the Scioto Main Sanitary Pump Stations project; to authorize the appropriation and transfer of funds from the Sanitary Sewer Reserve Fund to the Sanitary Sewer General Obligation (G.O.) Bond Fund; the transfer from the Build America Bonds (BABs) Fund, from the Sanitary Recovery Zone Super Build America Bonds Fund (Super BABs), from the Sanitary Sewer Permanent Improvements Fund, a total expenditure not to exceed $1,792,224.98; and to amend the 2015 Capital Improvements Budget. ($1,792,224.98)

Date	Ver.	Action By	Action	Result
7/23/2015	1	MAYOR	Signed
7/23/2015	1	CITY CLERK	Attest
7/20/2015	1	COUNCIL PRESIDENT	Signed
7/20/2015	1	Columbus City Council	Approved	Pass
7/13/2015	1	Columbus City Council	Read for the First Time

Explanation

BACKGROUND: This legislation authorizes the Director of Public Utilities to enter into an engineering agreement with Brown & Caldwell for professional engineering services for the Scioto Main Sanitary Pump Stations project, CIP 650886-100000. During a Scioto River 25 year flood event (or greater), the sluice gate at the Rhodes Park flow control structure must be closed, which results in all upstream flow from the Scioto Main trunk sewer being directly discharged to the Scioto River thru the McKinley Avenue overflow structure, which is upstream of Rhodes Park.

Currently, numerous manholes on the Scioto Main trunk sewer and its tributary sanitary sewers are structurally deficient and cannot withstand surcharge above their corresponding top of casting elevation, which is necessary for successful activation of the McKinley Avenue overflow structure. This deficiency prevents the City of Columbus from completing successful operation of our WCLPP requirements during Scioto River flood events.

A Large Diameter Sewer Condition Assessment will be performed on the middle section of the Scioto Main Trunk Sewer. This 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. A technical memorandum and delivery of the consolidated inspection records will be performed by the selected engineer. The memorandum shall be coordinated with any manhole rehabilitation and/or manhole abandonment proposed by this project.

Design tasks related to Scioto Main trunk sewer will include:
· Large Diameter Sewer Condition Assessment of Scioto Main Trunk Sewer - Middle section.
· Field survey and investigation of potential identified upstream WIB locations and associated structures.
· Field survey, investigation, review and design of recommended alternatives to mitigate upstream WIB occurrences (e.g. pump stations, back flow valves, etc.).
· Review and rese...