FROM: Robert Thompson, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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SONAR INSPECTIONS & PIPELINE CLEANINGS OF INVERTED SIPHONS AND LARGE DIAMETER PIPELINES, SPECIFICATION NO. S-2025-695BD
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a General Services Contract to Performance Pipeline Technologies, Inc. (PPT) dba Sanitation Systems for Sonar Inspections & Pipeline Cleanings of Inverted Siphons and Large Diameter Pipelines, Specification No. S-2025-695BD, for a total amount not to exceed $1,750,000 for the period of January 1, 2026, through December 31, 2026; with four (4) optional one-year renewal options; and
B. Approve an annual contingency of $175,000 (10%).
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BACKGROUND
Orange County Sanitation District (OC San) maintains more than 350 miles of gravity sewer pipes in its service area which are cleaned on a scheduled basis consistent with OC San's Sewer System Management Plan (SSMP). Line segments range in size from 8 inches to 120 inches. Depending on the pipe size and historical issues, cleaning frequencies have been developed and range from every 4 weeks to once every 5 years.
For smaller diameter pipes ranging from 8 inches to 18 inches, cleaning is conducted primarily through hydraulic flushing and vacuuming using a combination sewer cleaning vehicle. For medium diameter pipes ranging from 21 inches to 42 inches, pipes are cleaned mechanically using a cable tethered tire to act as a moving hydraulic scouring plug. Pipes greater than 42 inches are generally designed to be "self-cleaning" by creating internal flow velocities that scour potential sediment and are not regularly cleaned by OC San and are typically assumed to be self-cleaning by design of proper scouring velocity.
The purpose of this General Services Contract is to perform sonar inspections and pipeline cleanings of inverted siphons and...
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