FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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SIPHON ASSESSMENTS IN ANAHEIM, NEWPORT BEACH, AND ORANGE, PROJECT NO. PS25-01
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GENERAL MANAGER'S RECOMMENDATION
recommendation
RECOMMENDATION: Recommend to the Board of Directors to:
A. Find that the recommended action is exempt from the California Environmental Quality Act (CEQA) under the Class 6 categorical exemption set forth in CEQA Guidelines Section 15306, Information Collection, and the statutory exemption set forth in CEQA Guidelines Section 15262, Feasibility and Planning Studies;
B. Approve a Professional Services Agreement with HDR Engineering, Inc., to provide engineering services for the Siphon Assessments in Anaheim, Newport Beach, and Orange, Project No. PS25-01, for an amount not to exceed $2,781,000; and
C. Approve a contingency of $278,100 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) collections system includes 82 inverted siphons ranging from 8-inch to 96-inch in diameter. Inverted siphons are gravity sewers that have a dip in grade to avoid conflicts with existing infrastructure. This lowered elevation results in the sewer being completely full during operation, creating more challenges than typical gravity sewers with operation, maintenance, inspection and assessment. Many of the inverted siphons are on frequent cleaning schedules to maintain operations; however, none are on a routine inspection schedule.
RELEVANT STANDARDS
Protect OC San assets
Maintain a proactive asset management program
Commitment to safety & reducing risk in all operations
PROBLEM
The condition of most of OC San’s inverted siphons is based on age and type of piping material versus actual condition. Without condition information it is not feasible to accurately plan for the appropriate scope and schedule of the rehabilitation and replacement work to maintain their operation.
PROPOSED SOLUTION...
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