Case Studies

The Metropolitan Water District of Southern California, which provides drinking water to nearly 18 million people, is adding ozone disinfection facilities to its 630-million-gallon-per-day (mgd) Robert A. Skinner water treatment plant. The $241 million Skinner oxidation retrofit program will improve water quality by lowering disinfection by-products to meet new federal and state rules, reducing tastes and odors, and allowing unrestricted blending of Metropolitan's two source waters—California State Project Water and the Colorado River.

CDM is providing final design and construction support services for the new facilities, scheduled for completion in December 2008. The new facilities will use delivered liquid oxygen for ozone production while providing space for a future cryogenic oxygen production facility. The project includes these new major facilities:

• Six ozone contactors and an ozone generation building that houses five 4,000-pounds-per-day ozone generators 
• Liquid oxygen storage and feed equipment
• A 630-mgd plant influent flow-splitting structure
• Three chemical storage and feed systems (sulfuric acid, hydrogen peroxide, and caustic soda) associated with pH, taste, and odor control
• A new power substation and electrical switchgear building
• 60-mgd washwater grit removal system
• 34-mgd washwater clarification system
• 60-mgd washwater return pump station
• Interconnecting pipelines that range in diameter from 6 to 12 feet

CLIENT: Metropolitan Water District of Southern California

LOCATION: Temecula, California