68078c26_December_2013_Issue__Performance_Standard
[State] NY [Applicability] Disturbances greater than 1 acre Offsets allowed in areas where MS4 operates a qualifying program [Performance Standard] 
New development: Provide runoff reduction for a minimum fraction of WQv for the 90th percentile rain event Redevelopment: Either (1) treat 25% of WQv by reducing runoff or impervious cover or by using BMPs or (2) treat 75% of WQv with alternative practices
December 2013 Issue
Performance Standard