FINAL REPORT Evaluation of Seawater Desalination Projects ...

EVALUATION OF SEAWATER DESALINATION PROJECTS
PROPOSED FOR THE MONTEREY PENINSULA
2.1 Coastal Water Project (CAW)
Project name:
Proponent(s):
Location:
Purpose:
Coastal Water Project (CWP)
California American Water (CAW)
Moss Landing Power Plant, Moss Landing
Primarily (Basic Coastal Water Project), to comply with State of
California Water Resources Control Board Order No. 95-10 by
replacing the Carmel River shortfall, and to offset a portion of the
Seaside Groundwater Basin overdraft.
Alternatively (Regional Coastal Water Project), as a regional water
supply project to meet the Monterey Peninsula build-out water
demands; the water needs of the Marina Coast Water District; and the
water needs of Moss Landing, Castroville, and Northern Monterey
County.
The project is currently progressing as the Basic Coastal Water Project
Production volume:
Basic Coastal Water Project: 11,730 ac-ft per year
Seawater desalination plant: 10,430 ac-ft per year (10mgd)
Aquifer storage and recovery: 1,300 ac-ft per year
Regional Coastal Water Project: 20,272 ac-ft per year
Seawater desalination plant: 18,972 ac-ft per year (18 mgd)
Aquifer storage and recovery: 1,300 ac-ft per year
Key features: 1. Raw water pipeline will be used to transfer seawater from the
Moss Landing Power Plant cooling water discharge stream to the
desalination plant site proper.
2. Return water discharge will return concentrated seawater brine
back to the Moss Landing Power Plant cooling water discharge
stream.
3. Equalization basin will receive and store the incoming raw water.
4. Raw water pumping station will convey seawater from the
equalization basin to a pre-filtration process.
5. Raw water pretreatment process
6. Reverse osmosis (RO) process
7. Post-treatment process
8. Treated water storage
9. Treated water pumping station
10. Treated water pipeline
11. ASR operation expected to be operational by winter 2008 / 2009
and the full desalination plant operational by late 2010.
Key Information provided to
review team:
1. Coastal Water Project Conceptual Design Report California
American Water – September 2005
2. Proponents Environmental Assessment for the Coastal Water
Project – July 2005
Persons interviewed: 1. Sarah Hardgrave, RBF Consulting
2. John C. Klein, CAW
Figure 1 shows the MLPP site and the proposed pipeline alignment.
Monterey Peninsula Water Management District 2-2