(A) Developed areas, as compared to undeveloped areas, generally have increased imperviousness, decreased infiltration rates, increased runoff rates, and increased concentrations of pollutants such as fertilizers, herbicides, greases, oil, salts and other pollutants. As new development and redevelopment continues in Edinburgh, measures must be taken to promote runoff volume reduction, infiltrate storm water into the ground and intercept and filter pollutants from storm water runoff prior to reaching regional creeks, streams, rivers and wetlands. Using BMPs, harmful amounts of sediment, nutrients, and contaminants will be reduced in storm water runoff.
(B) Storm water quality measures are incorporated as a permanent feature into construction projects and are left in place following completion of construction activities to continuously treat storm water runoff from the stabilized site. The following will be implemented as a minimum:
(1) The control of storm water quality will be based on the management of Total Suspended Solids (TSS). The town requires a minimum of 80% removal of TSS including floatables without resuspension. TSS is defined as particles smaller than 125 microns in diameter.
(2) New retail gasoline outlets and refueling areas or those that replace their existing tank systems, regardless of size, are required to install appropriate measures to reduce lead, copper, zinc, and polyaromatic hydrocarbons in storm water runoff.
(3) Infiltration practices will not be allowed in wellhead protection areas as the primary water quality treatment measure, unless the measure is designed to treat the pollutant(s) of concern that originate in the drainage area of the measure.
(4) Discharges from new development and redevelopment sites will not be allowed directly into karst features without pre-treatment.
(5) Outfalls must be designed to reduce outfall scouring and bank erosion.
(Ord. 2023-22, passed 12-28-23)