This action will address an error that was identified in the Effluent Limitations Guidelines for the Construction & Development (C&D) Point Source Category. The C&D rule was issued on December 1, 2009, and became effective on February 1, 2010. The 2009 ELG rule contained a numeric effluent limit for turbidity, based on the application of passive treatment technology. After promulgation, the Environmental Protection Agency (EPA) received two petitions for reconsideration of the C&D rule. The petitions pointed out a potential error in the calculation of the numeric limit. Based on EPA's examination of the underlying dataset, the calculations in the existing administrative record are not adequate to support the numeric effluent limit. EPA issued a stay of the numeric limitation on January 4, 2011. The stay will be in place until a new limit is finalized or the limit is withdrawn through a rulemaking action. EPA has issued a Federal Register notice soliciting additional data. EPA intends to propose a correction rule for public comment and then take final action on a revised limitation in the future.