ORANGE COUNTY The Orange County Sanitation District (OCSD) serves more than 2.5 mil- lion residents of central and northwestern Orange County, California, and currently operates the nation’s third largest wastewater treatment plant west of the Mississippi River. In 2002, the OCSD Board of Directors voted to move to 100 percent secondary treatment of all approximately 250 mil- lion gallons of wastewater received each day. Undoubtedly an expansi

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