To control postconstruction
stormwater impacts from regulated earth disturbance activities, State
Water Quality Requirements can be met by BMPs, including site design,
which provide for replication of preconstruction stormwater infiltration
and runoff condition, so that postconstruction stormwater discharges
do not degrade the physical, chemical or biological characteristics
of the receiving waters. This may be achieved by the following:
(1) Infiltration:
replication of preconstruction stormwater infiltration conditions;
(2) Treatment:
use of water quality treatment BMPs to ensure filtering out of the
chemical and physical pollutants from the stormwater runoff; and
(3) Streambank
and streambed protection: management of volume and rate of postconstruction
stormwater discharges to prevent physical degradation of receiving
waters (e.g., from scouring).