Mission Trails Flow Regulatory Structure II and Control Facility

Butier Engineering, Inc. provided construction management services for the Mission Trails Flow Regulatory Structure II and Flow Control Facility Project. Ninyo & Moore provided materials testing, soils testing, and geotechnical services as a sub-consultant to Butier. The project, which is located in the northwest area of Mission Trails Regional Park, upgraded the untreated water system that delivers water to treatment plants serving central and southern San Diego County. The 5-million-gallon concrete reservoir holds enough water to fill seven Olympic-sized swimming pools. Visitors to this area of the park will be unaware that the giant tank is there since it is buried and covered with soil and vegetation that matches the surrounding landscape.

Construction of the new flow regulatory structure and flow control facility included appurtenances, piping, fittings, drainage facilities, specialties, structures, and ancillary components. The flow control facility is downstream of the flow regulatory structure located on Pipeline 3 downstream of the existing flow balancing structure. Additional scope of work items included the following:

• 115 linear feet of 94-inch welded steel pipe, 55 linear feet of 74.5-inch welded steel pipe, 55 linear feet of 71-inch welded steel pipe for the north connection between the existing Mission Trails Pipeline Tunnel and Pipelines 3 and 4
• 400 linear feet of 94-inch welded steel pipe for the outlet pipe connection between the Mission Trails Flow Regulatory Structure II and the existing south tunnel shaft
• 65 linear feet of 92-inch welded steel pipe for the south connection between the existing Mission Trails Pipeline Tunnel and Pipeline 3
• Demolition of eight (8) existing Elliot vents and seven (7) existing blow-offs
• Abandonment of portions of existing Pipelines 3 and 4

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