FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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NORTH TUSTIN-ORANGE SEWER REHABILITATION, PROJECT NO. 7-69
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Professional Design Services Agreement with Stantec Consulting Services, Inc., to provide engineering services for North Tustin-Orange Sewer Rehabilitation, Project No. 7-69, for an amount not to exceed $5,086,373; and
B. Approve a contingency of $508,637 (10%).
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BACKGROUND
Orange County Sanitation District (OC San) owns and operates sewer trunklines within the City of Tustin, City of Orange, and unincorporated Orange County. These trunklines were originally constructed between the early 1960s and mid-1980s, with the majority of infrastructure installed during the 1960s. Since that time, limited sewer improvements have been made within the project area.
RELEVANT STANDARDS
* Comply with California Government Code Section 4526 to engage the best qualified firm "on the basis of demonstrated competence and qualifications" and "negotiate fair and reasonable fees
* Protect OC San assets
* Maintain a proactive asset management program
PROBLEM
CCTV inspection records indicate that several pipeline segments are broken or fractured, exhibit severe sags, and have a history of root intrusion. In addition, sewer manholes within the project area show signs of linear delamination or lack protective liners, which can accelerate structural degradation.
Several sewer assets within the project area present significant maintenance challenges due to site constraints and restricted access. These manholes cannot be adequately inspected or maintained, further increasing the risk to system reliability.
PROPOSED SOLUTION
Approve a Professional Design Services Agreement to replace 850 feet of sewer, rehabilitate 4,785 feet of sewer using cured-in-place pipe, ins...
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