COM 0872.000 2014-2016 - Laserfiche WebLink

Home

Form #: B-52 7/18/91 DEPARTMENT OF FINANCE REQUEST FOR COUNCIL ACTION DEPARTMENT: Dept of Environmental Management DATE: 04/11/16 STAFF CONTACT: Dora Beck PHONE: 961-8513 A. REQUEST: An Ordinance authorizing the Mayor to enter into an intergovernmental agreement for a State Water Pollution Control Revolving Fund Loan for Wastewater improvement projects and authorizing the issuance of$14,000,000 General Obligation Bonds of the County of Hawai'i for the purpose of financing the following project: Pua Force Main Installation and Rehabilitation $14,000,000 B. BACKGROUND AND JUSTIFICATION (USE ADDITIONAL SHEETS AS NEEDED): All raw wastewater from Hilo town (average of 2.8 MGD or Million Gallons per Day) is conveyed to the Hilo Wastewater Treatment Plant (HWWTP) via the Pua SPS and the existing force main. Recent tests performed by the Wastewater Division on the existing force main shows signs of restriction which negatively affects the performance of the equipment that makes up the pumping system that conveys wastewater to the HWWTP. The installation of a new additional sewage force main from the Pua Sewage Pump Station (Pua SPS) to the HWWTP and the rehabilitation of the existing 24-inch sewer force main are required to address and correct deficiencies in the existing force main. Once installation of the new force main is complete, the existing Force Main will be rehabilitated to remove the cause of the existing flow restriction in the system as well as to incorporate mitigation measures to address critical performance factors. Rehabilitation of the existing force main (once the new force main is installed and placed into operation) is desirable as it provides a redundant means of conveying raw wastewater from Hilo town to the HWWTP for treatment in the event of required maintenance work on one of the two force mains. An all-night live repair of the existing force main was required in 2011 to keep the force main in service while repairing a crack in the force main pipe. Failure of the existing force main would result in a raw sewage spill to State Waters via the Hilo Outfall and would subject the County to potential enforcement action by regulatory agencies. It is noted that the existing sewer force main was installed in 1990 and is therefore 26 years old. The age and the deficiencies in the force main are major contributors to decreasing the serviceability of equipment needed to convey raw sewage to the HWWTP. SIGNED: O71tLi,c DATE: 4-///1 /16" Department Head