Stormwater Management - SSc6 Implementation Rate and Quantity - Developed and implemented a Stormwater Management Plan (SMP) Installed a series of small rain gardens that empty into a bioswale, which ultimately empties into a larger bioretention area at the low end of the site Installed a bioretention area that stores a volume of quality water that meets local municipal criteria and has a flow control orifice in a manhole that constrains any remaining stormwater runoff to a maximum discharge rate to 10 L/s (159 gpm) per hectare of drainage area, or 4.1 L/s (65 gpm) under maximum head conditions Installed a curbside bioswale on Hallowell Road to treat 465m2 (5,003 ft2) of public roadway stormwater runoff Provided for a design contingency for large storm event (100 yr+) stormwater to the adjacent street Required rate and quantity of stormwater runoff to be reduced at least 25% Actual calculated decrease is 54% Treatment - The above SMP improved the overall stormwater quality Complied to US EPA 840-B-92-002, Chapter 4, Part 2 Required removal of 80% total suspended solids (TSS) and 40% total phosphorus (TP) Actual calculated removal is 80% TSP and 40% TP