Project Description

Project Facilities

The Regional Desalination Project includes construction and operation of a water desalination facility that will produce potable water by extracting brackish groundwater from a basin that has been intruded by seawater due to historical pumping practices.  The basin is therefore considered impaired, and the project will be reclaiming that water for potable use.  The Project consists of several distinct components: Brackish Source Water Wells, Brackish Source Water Pipeline, Desalination Plant; a brine discharge Outfall Facilities; Product Water Pipelines and storage facilities; and an aquifer storage and recovery system (ASR). 

Project Component Description Ownership
Brackish Source Water Wells Between one and six vertical wells drilled in the 180-Foot Aquifer and between one and five slanted seawater intake wells.  Vertical wells will be located west of Highway 1 between the coastal dunes and Highway 1.  Source water will be approximately 85% seawater and 15% seawater-intruded groundwater. MCWRA
Brackish Source Water Pipeline Up to 25,000 linear feet (LF) of 36 to 42-inch pipe conveying the source water from the wells to the Desalination Plant, and a brackish water meter. MCWRA
Desalination Plant Reverse osmosis treatment plant with a peak production rate of 10 million gallons per day (mgd).  On-site facilities include treatment processes, clearwells, brine storage tank, distribution pump station, and non-process structures. MCWD
MCWD Outfall Facilities and  MRWPCA Outfall Facilities A pipeline for brine conveyance from the Desalination Plant to the outfall headworks (2,500 LF of 36-inch diameter pipeline) and modifications to the outfall pipeline, including a new Brine Receiving Facility for monitoring, metering, mixing, and sampling the Desalination brine and combined effluent. MCWD
Monterey Regional Water Pollution Control Agency (MRWPCA)
MCWD Product Water Pipeline A pipeline for conveyance of product water from the Desalination Plant to Delivery Point (31,000 LF; 36-inch) MCWD  
MCWD Tie In Pipeline A pipeline for conveyance of product water from the Delivery Point to MCWD Reservoirs B and C (12,500 LF; 24-inch) MCWD
Transfer Pipeline A pipeline for conveyance of product water from the Delivery Point to the western terminus of Auto Center Parkway near Del Monte (15,000 LF; 36-inch) CAW
Seaside Pipeline A pipeline for conveyance of product water from the Western terminus of Auto Center Parkway to the Terminal Reservoir (13,000 LF; 36-inch) CAW
Monterey Pipeline A pipeline for conveyance of product water from the Western terminus of Auto Center Parkway to Eardley Pump Station, including Presidio of Monterey portion  (28,700 LF; 36-inch) CAW
Terminal Reservoirs  and Associated Facilities Two, 3-MG reservoirs, 130 feet in diameter, and overflow -retention/infiltration basin. CAW
ASR System Two ASR injection/extraction wells and a monitoring well located at Fitch Park, a pump station at the Terminal Reservoir site, pipelines along General Jim Moore Blvd. between the new ASR wells and the existing ASR wells near Coe Ave., and an ASR Pump-to-Waste System (including pipelines and a settling basin) currently proposed for the ASR well sites.  CAW
Valley Greens Pump Station 3-mgd capacity, four 25-hp pumps on 800 square foot area. CAW
Associated Project
Renewable Energy Facility 6,000-kilowatt gas-driven engine generator facility and inter-connecting power distribution to power the Desalination Plant.  Fuel will be combination of natural gas and landfill gas. Monterey Regional Waste Management District (MRWMD)
Note: Pipeline lengths are approximate.
Source:  RMC Water and Environment, RBF Consulting, and EMC Planning Group, August - October 2010.
   Copyright © 2011 Monterey Bay Regional Desalination Project. All Rights Reserved.
Monterey County Water Resources Agency Marina Coast Water District California American Water