FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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SERVICE CONTRACT FOR PLANT NOS. 1 AND 2 CENTRAL GENERATION CARBON CHANGE-OUT, SPECIFICATION NO. S-2020-1130BD
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Award a Service Contract to EnviroSupply & Service Inc. for Plant Nos. 1 and 2, Central Generation Facility Fuel Gas Cleaning System, Carbon Change-Out [replacement]; Specification No. S-2020-1130BD, for a total amount not to exceed $240,702 for the period July 1, 2020 through June 30, 2021, with four (4) one-year renewal options; and
B. Approve a contingency of $24,071 (10%).
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BACKGROUND
The Plant Nos. 1 and 2 Central Generation facilities are equipped with activated carbon vessels/filter beds for cleaning digester gas prior to combustion in the engines. The activated carbon beds work in series to protect the air emissions control catalysts that were installed to meet South Coast Air Quality Management District (SCAQMD) permit requirements.
RELEVANT STANDARDS
* Maintain a proactive asset management program
* 24/7/365 treatment plant reliability
* Protect Orange County Sanitation District assets
PROBLEM
The digester gas cleaning system must run continuously in order to protect the Central Generation engines and exhaust catalysts from hydrogen sulfide and siloxanes. Both hydrogen sulfide and siloxanes are present in digester gas and will poison the exhaust catalysts. The activated carbon beds have a limited capacity to adsorb these contaminants. When the carbon adsorption material is fully consumed, it must be replaced.
PROPOSED SOLUTION
Enter into a service contract with a vendor to replace the activated carbon material used to clean digester gas at Plant Nos. 1 and 2.
TIMING CONCERNS
The current contract for activated carbon replacement expires on June 30, 2020.
RAMIFICATIONS OF NOT TAKING ...
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