FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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TRICKLING FILTER ODOR CONTROL STUDY AT PLANT NO. 1, PROJECT NO. PS24-04
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Professional Services Agreement with Black & Veatch Corporation to provide engineering services for the Trickling Filter Odor Control Study at Plant No. 1, Project No. PS24-04, for an amount not to exceed $548,506; and
B. Approve a contingency of $54,851 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) has long utilized trickling filters at Plant No. 1. Trickling filters provide secondary level treatment for wastewater. In 2006, OC San replaced its original four trickling filters with two new trickling filters and secondary clarifiers as part of Project No. P1-76, Trickling Filter Rehabilitation and New Clarifiers at Plant No. 1. These trickling filters are a key unit process to maintain plant operations and meet operational requirements.
The trickling filters at Plant No. 1 have had issues with the creation of nuisance odors. OC San has previously reviewed this issue in feasibility studies and as part of SP-166, Odor Control Master Plan. These efforts identified the installation of covers and associated foul air treatment systems as a potential solution; however, structural standards have changed and may impact the viability of cover installation. There are also significant operational impacts associated with cover installation that may require further modifications.
These trickling filters are currently scheduled to undergo media replacement and rehabilitation as part of Project P1-142, Trickling Filter Media Replacement at Plant No. 1.
RELEVANT STANDARDS
* Less than 12 events for the collection system, under normal operations
* Operate and maintain facilities to minimize impacts on surrounding communities, including odor, noise, and lighting
PROBLE...
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