FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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UTILITY TUNNEL RELIABILITY STUDY AT PLANT NO. 1 AND NO. 2, PROJECT NO. PS24-03
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Professional Services Agreement with Kleinfelder, Inc., to provide engineering services for the Utility Tunnel Reliability Study at Plant No. 1 and No. 2, Project No. PS24-03, for an amount not to exceed $961,548; and
B. Approve a contingency of $96,155 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) has been seismically evaluating existing structures starting with the Seismic Evaluation of Structures at Plant Nos. 1 and 2, Project No. PS15-06, in 2019. Project No. PS15-06 prioritized the evaluation of critical, occupied structures and led to various current and future improvements to improve operational resilience and safety. OC San has continued with similar evaluations of other structures and process facilities through other studies to facilitate planning efforts. Utility tunnels located throughout both plants have not yet been seismically evaluated. These tunnels are critical to proper process operations as they serve as corridors for process piping, utilities, and electrical cables.
RELEVANT STANDARDS
* Ensure the public's money is wisely spent
* Commitment to safety & reducing risk in all operations
* Protect OC San assets
PROBLEM
The utility tunnels were constructed over time as the treatment facilities expanded with some tunnels now more than 50 years old. The tunnels were built based on the building code at the time of construction. Seismic standards have changed significantly over time and generally did not provide the same level of seismic resilience as modern requirements. In addition, some tunnels show signs of deterioration due to their age and have potential operational risks such as flo...
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