CC - Agendas - City Council - REGULAR - 12/2/2014

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r•5 . crrl of P�RESCOTT FI)C/ %'f/l COUNCIL AGENDA MEMO MEETING DATE/TYPES: COMBINED WORKSHOP AND 12-02-2014 REGULAR VOTING SESSION DEPARTMENT: Public Works AGENDA ITEM: Ratification of Purchase Order No. 2150232 with Instrumentation and Controls, LLC, for emergency procurement of MSA gas detection equipment in an amount not to exceed $30,634.84 Approved By: Date: Director: Hash, Henry 11/14/2014 City Manager: McConnell, Craig O Item Summary The Public Works Department, Utilities Division, is requesting Council ratification of City Purchase Order No. 2150232 with Instrumentation and Controls, LLC, to provide MSA gas detection equipment for continuous monitoring of hazardous locations. Background The Sundog Wastewater Treatment Plant (WWTP) currently has MSA brand gas detection monitors for the anaerobic digester complex. The monitors were installed during the 1990 expansion project for continuous monitoring of hazardous and explosive gases common to the anaerobic digestion process. The gas monitors are intended to generate alarms through audible, visual, and plant supervisory control and data acquisition (SCADA) to alert staff of potential hazardous conditions. The current monitors are no longer operational, and not repairable. A recent site inspection by the Arizona Division of Occupational Safety and Health (ADOSH) noted that the existing gas detection system was not functioning, and that the Solids Dewatering Building lacked this equipment. National Fire Protection Association Standard 820 for Wastewater Treatment and Collections Facilities requires a combustible gas detection system in anaerobic digester control buildings for storage, handling, or burning of sludge gas.