Touted as the largest capital improvement project in Stockton's history, the DWSP improves water reliability, protects groundwater and provides drought protection for the city.
Touted as the largest capital improvement project in Stockton's history, the Delta Water Supply Project (DWSP) improves water reliability, protects groundwater and provides drought protection for the city, which was no longer able to rely on pumped groundwater and purchased water for its municipal supply.
Completed in June 2012, the DWSP pumps surface water from the Sacramento-San Joaquin Delta. The initial permit allows the city to draw the same amount of water from the city's wastewater treatment plant as the city puts in, creating one of the first indirect potable water-recycling projects in Northern California. The $175.9-million, two-stage design-build approach delivered the 30-mgd water treatment plant and more than 18 miles of raw-water and treated-water pipelines. An ultimate capacity of 160 mgd is planned.
The DWSP included design and construction of the state-of-the-art treatment process; administration, operations and maintenance buildings; solids settling and drying basins; treated- and reclaimed-water pump stations; and a 4-million-gallon treated-water storage reservoir.
The project required the design and installation of 12 miles of new 54-in.-dia raw-water pipeline and more than six miles of 54-in.-dia, 42-in.-dia and 36-in.-dia treated-water pipelines and construction of seven microtunnels.
The campus earned LEED-Gold certification.
Delta Water Supply ProjectStockton
Owner: City of Stockton
Design-Builder: CDM Smith, Walnut Creek
Structural/Civil/MEP Engineer: CDM Smith, Bellevue, Wash.
Tunneling: Bennett Engineering Services, Roseville; Vadnais, Vista
Electrical: San Joaquin Electric, Stockton
Pipeline: Sundt, Tempe, Ariz.
Earthwork/Sitework: Teichert, Stockton
HVAC/Plumbing: KMS, Livermore
Roofing: Legacy Roofing, Sacramento
Concrete/Structural/Steel/Process Mechanical: Monterey Mechanical, Oakland
Prestressed Tank: DYK Inc, El Cajon
Painting: Mason Painting, Rancho Cordova
Yard Piping: Preston Pipelines, Lathrop
Architect: Michael Willis Architects, San Francisco
Landscape Architect: Jeffrey Gamboni Landscape Architect, Stockton
Environmental: ESA, Sacramento
Geotechnical: Kleinfelder, Stockton
Corrosion: V&A Consulting Engineers, Oakland
Submitted by CDM Smith