68078c26_December_2013_Issue__Performance_Standard
[State] PA [Applicability] Disturbances greater than 1 acre Guidance under development for offsets [Performance Standard] 
New development: No increase in total runoff volume for all events up to the two-year storm Redevelopment: Treat 20% of existing impervious cover as if it were meadow condition
December 2013 Issue
Performance Standard