Work starts for Encina sewer improvement project

18 February 2016


USA – The cities of Carlsbad and Vista, California, are replacing a segment of critical infrastructure along Carlsbad’s coastline that conveys up to 33 million gallons a day of wastewater to the Encina Water Pollution Control Facility, Carlsbad City announced.

Work on the Avenida Encinas Sewer Improvement Project began in January and will be performed in segments over the next two years. The project improvements include the installation of approximately 2 miles of new sewer pipeline with crews laying new 54-inch diameter pipeline using a combination of open trench construction and tunnelling.

"There will be some equipment at the tunnel shafts, but tunneling the pipeline will have less traffic impact than open trench construction," said City of Carlsbad senior engineer Terry Smith, the project manager.

During pipeline work, the City of Carlsbad will also install a new, 11,000ft recycled water line to enhance the city's overall goal of improving water conservation through the expanded use of recycled water. This line will connect with other existing pipelines and accommodate future recycled water expansion to areas such as Carlsbad Village.

The project also includes replacement of the old Agua Hedionda Sewer Lift Station on the south shore of the lagoon with a new facility. Lift stations include pumps that raise wastewater to higher elevations so that it can then flow by gravity to the water pollution control facility for treatment.

The original Vista/Carlsbad interceptor sewer system was constructed in 1965 and is jointly owned by the cities of Vista and Carlsbad. The two cities have been upgrading the system in stages. The Carlsbad City Council awarded the approximately USD 44.2M construction contract in May 2015 after a competitive process to Pulice Construction.