By mid-February, the U.S. Environmental Protection Agency (EPA) is scheduled to release a final construction general permit (CGP) for 2012. It will not include numeric turbidity limits, and states not using EPA’s CGP will not be required to incorporate the limit and associated monitoring requirements into their permits. EPA stayed the numeric turbidity limit of 280 nephelometric units to correct a calculation error when establishing the 2009 effluent limitation guidelines. To devise a new limit, the agency is seeking more data on the cost, feasibility, and effectiveness of technologies for controlling turbidity in construction discharges, especially regarding passive treatment. Comments are due March 5. See the Federal Register notice.
September 5, 2013
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