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Water treatment plant ready to move forward 

water treatment plant

City Council moves forward on new water treatment plant

$11.5 million plant will allow city to use Lake Nacimiento water

Construction of a new $11.5 million water treatment plant moved forward Tuesday night when the city council approved a construction management company for the project.

The water treatment plant will allow the city of Paso Robles to begin using its right to 4,000-acre-foot of water from the Nacimiento Water Project pipeline, which was completed in 2011.

The design plans for the water treatment plant is 90-percent complete, according to a city report. Construction is set to begin next year and the plant is expected to completed in 2015. The city has been collecting increased water fees to pay for the pipeline and the treatment plant. The balance of the three Nacimiento Water Funds totals $11.47 million.

The council authorized City Manager Jim App to enter into a contract with AECOM in an amount not to exceed $962,652 to provide full-time construction management services for construction of the new surface water treatment plant.

Phase-I construction

  • Structures – An operations building and structural covers to appropriately house equipment and chemicals
  • Chemical Pretreatment – Preoxidation of organic material and manganese, and to improve taste and odor
  • Physical Pretreatment – a dissolved air flotation system (DAF) will remove organic material, reduce disinfection-byproduct-formation potential, and improve performance of membrane filters.
  • Membrane Microfiltration – Provides a high level of physical filtration, turbidity, and pathogen removal.
  • GAC System – Reduce disinfection byproduct formation and improve overall taste and odor characteristics of the water.
  • Disinfection Basin and Clearwell: A below grade concrete clearwell will provide the necessary contact time for disinfection. A high-service pumping station will connect downstream to the clearwell for pumping into the distribution system.


Background on the the Nacimiento Water Project

Lake Nacimiento dam

The Lake Nacimiento dam under construction in 1959. The construction of the earth fill dam was completed in 1961. – Monterey County Herald.

In 1959, the County of San Luis Obispo secured the rights to 17,500 acre-feet of water per year from Lake Nacimiento in an agreement with the County of Monterey, which built a damn at the lake, which is entirely within SLO County.

Construction of a pipeline to deliver that water right was completed in 2011. The total cost of the regional water delivery project was $176 million.

The project is owned, managed and operated by the San Luis Obispo County Flood Control and Water Conservation District and is the largest project ever constructed by the District. It was made possible through the collaboration between the project participants: the City of Paso Robles, Templeton Community Services District, Atascadero Mutual Water Company, the City of San Luis Obispo, and Community Services Area 10.

The delivery system consists of an intake facility at Lake Nacimiento with a pump station, two intermediate pump stations, three storage tanks, a control system, and approximately 45 miles of transmission pipeline ranging from 36- to 12-inches in diameter. The system has the ability to deliver 15,750 acre-feet of untreated water each year to communities within San Luis Obispo County.

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About the author: Publisher Scott Brennan

Scott Brennan is the publisher of this newspaper and founder of Access Publishing. Follow him on Twitter, LinkedIn, or follow his blog.