Re-Advertise WWTP Digester Gas Utilization Project No. 116-050

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INTER -OFFICE MEMORANDUM DEPARTMENT OF PUBLIC WORKS DIVISION OF ENVIRONMENTAL SERVICES TO: Members of the Board of Public Works Eric Horvath, Director of Public Works Michael Schmidt, Board of Public Works Attorney FROM: Al Greek, Director of Utilities Jacob M. Klosinski, Assistant City Engineer SUBJECT: Agenda Request Form — Title Sheet and Request to Advertise Project No. 116-050 Wastewater Treatment Plant — Digester Gas Utilization DATE: October 18, 2016 The Division of Utilities is requesting the Board of Public Works approval of the Title Sheet and Request to Advertise for the subject Project No. 116-050 Wastewater Treatment Plant Digester Gas Utilization. Design Engineer, Greeley and Hansen, LLC, has completed the engineering design services for the extension of mechanical piping from the WWTP Digester Gas Cleaning System to the Compressor Building and CNG Fuel Station. This is a rebid of the subject project since the bids received at the October 11, 2016 exceeded the Engineer's Estimate and budgeted amounts to construct the project. The objective of this project is to provide additional energy recovery through the extension of mechanical piping to facilitate the use of cleaned digester gas in the Raw Sewage Pump No. 1 engine at the Compressor Building and to provide piping to the CNG Fuel Station located south of the Maintenance Garage / Solid Waste Building at the Wastewater Treatment Plant Site. The City will continue to recover cleaned digester gas in the boiler for Digester No. 2. In addition, piping at the Compressor Building will also be extended to allow recovery of Digester Gas in the Caterpillar Engine which powers one of the air blowers at the Compressor Building. The Caterpillar Engine is exercised weekly and serves as a back-up to the Electric Blowers at the Compressor Building. The following project schedule will follow upon Board of Public Works approval: Friday, November 4, 2016 First Advertisement Friday, November 11, 2016 Second Advertisement Wednesday, November 16, 2016 Pre -Bid Meeting December 3 or 8, 2016 Bid Opening (*) December 8 or 22 or 27, 2016 Bid Award (*) December 2016 Begin Procurement and Construction Activities (*) Dates being finalized at the time this Memo was drafted. The funding source for the project is Wastewater, Capital Account (642-0630-415-43-66). If there are any questions regarding the subject project, please contact Al Greek (Ext. 4210) or Jacob M. Klosinski (Ext. 9496) at the Division of Utilities.