“a) Water Quality Treatment Performance Standard
Treat the first one (1) inch of runoff from the entire site. BMPs shall be designed on a site-specific basis to achieve a minimum of 80 percent removal of total suspended solids (TSS) as compared with uncontrolled runoff or a discharge concentration of TSS not to exceed 80 milligrams per liter (mg/l).
b) Channel Protection Performance Standard
The post-construction runoff rate and volume of discharge shall not exceed the predevelopment rate and volume for the project site for all storms up to the two-year, 24-hour storm.”
(i.) Projects that disturb one (1) acre or more.
(ii.) Projects less than one (1) acre that are part of a larger common plan of development or sale that would disturb one (1) acre or more.
(iii.) Projects less than one acre with special circumstances such as development in floodplains, wetlands, or other critical areas and any development or redevelopment that may have a significant downstream impact.