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Brown and Caldwell begin work on pipeline rehab project in California

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Environmental engineering and construction firm Brown and Caldwell will provide engineering design services for rehabilitation of a section of the Allen-McColloch pipeline in California.

The contract, which was awarded by Metropolitan Water District of Southern California (Metropolitan) is for rehabilitation of the prestressed concrete cylinder pipe (PCCP) section of the Allen-McColloch pipeline.

Metropolitan provides water to 26 member public agencies that serve 19 million customers in Los Angeles, Orange, Riverside, San Bernardino, San Diego and Ventura counties. In 2011, Metropolitan authorised the start of a $2.5 billion (€2.235 billion) PCCP rehabilitation and replacement programme to help maintain reliable water deliveries to member agencies.

The Allen-McColloch pipeline delivers treated water from the Diemer Water Treatment Plant in Yorba Linda to El Toro Reservoir in Orange County.

Brown and Caldwell will carry out preliminary design and prepare conceptual drawings for the rehabilitation of the pipeline. Work will include relining, replacement of existing valves, flowmeters and structures, as well as additional necessary appurtenant work.

“We are honoured to be chosen for this important project,” said programme director Dave May. “Our committed team looks forward to collaborating with Metropolitan to minimise community and environmental impacts while maximising the life of existing infrastructure in the most cost-effective and sustainable manner.”

Design phase activities are due to be completed by July 2023, after which rehabilitation and construction will take place in sequences to minimise disruption to service connections.