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The permit was set to expire earlier this summer on June 30, but the EPA says it needs more time to complete a new and revised CGP that for the first time will incorporate Effluent Limitation Guidelines (ELGs) for construction and development.
The ELG rule was originally issued in December 2009, but NAHB challenged the data that was used to set numeric turbidity limits — or amount of solids — in stormwater runoff from construction sites. This forced the agency to revise those limits, an effort that is still underway.
In a May 25 comment letter to the EPA, NAHB had asked for the current CGP, which has been in effect since 2008, to be extended through its full term to July 13, 2013.
This would give the agency the time it needs to recalculate the numeric turbidity limit and promulgate it and to address other issues raised by the newly proposed CGP, the letter said.