FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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SANTA ANA TRUNK SEWER REHABILITATION, PROJECT NO. 1-23
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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 Santa Ana Trunk Sewer Rehabilitation, Project No. 1-23, for an amount not to exceed $3,880,000; and
B. Approve a contingency of $388,000 (10%).
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BACKGROUND
The Santa Ana Trunk, which carries sewage from the southern portion of Santa Ana and the northern portion of Costa Mesa to Orange County Sanitation District (OC San) Plant No. 1, was originally constructed in the early 1950s. Several projects have replaced or rehabilitated small portions of the pipe and rehabilitated the majority of the manholes in the past 60 years.
The project area for the Santa Ana Trunk Sewer Rehabilitation is located in Alton Avenue heading west from Bristol Street then diagonally through easements in a light industrial/commercial area toward Plant No. 1. The Santa Ana Trunk sewer is constructed of unlined 42-inch and 48-inch diameter reinforced concrete pipe.
RELEVANT STANDARDS
* California Government Code ?4526: Select the "best qualified firm" and "negotiate fair and equitable fees"
* Protect OC San assets
* Commitment to safety & reducing risk in all operations
PROBLEM
Closed circuit television inspections and corrosion assessments revealed severe defects, including exposed aggregate, exposed reinforcement steel and infiltration in the pipelines, as well as exposed aggregate and liner detachment in some manhole structures.
PROPOSED SOLUTION
Award a Professional Design Services Agreement for Project No. 1-23 to rehabilitate the corroded sewer pipelines and manholes for the Santa Ana Trunk Sewer north of Interstate 405. The design will rehabilitate appr...
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