FROM: Robert Thompson, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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TRICKLING FILTER A AND B CENTER ROTATING ASSEMBLIES REPLACEMENT AT PLANT NO. 2, PROJECT NO. MP2-005
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a sole source General Services Contract to Jamison Engineering Contractors, Inc. for Trickling Filter A and B Center Rotating Assemblies Replacement at Plant No. 2, Project No. MP2-005, for a total amount not to exceed $494,600; and
B. Approve a contingency of $49,460 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) trickling filters at Plant No. 2 consist of three 150-foot diameter rotating assemblies. This trickling filter process provides secondary treatment rated at 60 MGD average during dry weather and approximately 182 MGD during peak wet weather capacities. The trickling filters are engineered to remove the organic content in wastewater utilizing micro-organisms living on the filter media. Each trickling filter is equipped with a motor-operated rotary distributor assembly to uniformly distribute the primary treated flow over the media.
Following structural failures in Trickling Filter A, fabrication of a new Center Mast Assembly for Trickling Filter A was approved in June 2022. Subsequently, similar structural deficiencies were identified in the Trickling Filter B Center Mast Assembly and fabrication of replacement pieces was approved in July 2022. The equipment is scheduled to be shipped to Plant No. 2 for installation in May 2023.
RELEVANT STANDARDS
* Maintain a proactive asset management program
PROBLEM
Trickling Filters A and B Center Mast structures have been fabricated and will be delivered to Plant No. 2. The new structural elements need to be installed in Trickling Filters A and B.
PROPOSED SOLUTION
Replace Trickling Filters A and B Center Mast structur...
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