Arsenic has received significant attention since the U.S. Environmental Protection Agency lowered the maximum contaminant level (MCL) through the Arsenic Rule (effective January 23, 2006, the rule lowers the arsenic MCL from 50 ug/L to 10 ug/L). A water contaminant, arsenic is also a common pollutant in many hazardous waste sites, and studies by the U.S. Geological Survey show the southwestern United States to have some of the highest levels of arsenic.
CDM has design experience with several technologies for arsenic treatment and removal, including ion exchange, granular iron media, and coagulation filtration, and carefully evaluates the effectiveness of each with respect to the specific needs of the water system. The residuals generated from arsenic treatment facilities are also a significant concern, as some treatment technologies will generate a liquid waste (exceeding 5 mg/L), which is classified as a RCRA hazardous waste. CDM can support our clients with decision analysis to determine the best technology for each specific need.
CDM is currently designing several arsenic treatment facilities, including the nation's largest coagulation/microfiltration facility in New Mexico, and is also performing arsenic projects in Texas, Arizona, Nevada, California, and South Carolina. CDM can provide conventional delivery of arsenic treatment facilities (design, bid, build) or design-build services for quick implementation.