20051071 Ver 1_Staff Notes_20050714

WQC #3402
must be maintained adjacent to all perennial waters except for allowances as provided
under the Water Supply Watershed Protection Rules. For the purposes of this condition,
perennial waters are defined as those shown as perennial waters on the most recent
USGS 1:24,000 topographic map or as otherwise determined by local government
studies;
4. Additional site-specific stormwater management requirements may be added to this
Certification at DWQ's discretion on a case by case basis for projects that have or are
anticipated to have impervious cover of greater than 30 percent. Site-specific stormwater
ma ent shall be designed to remove 85% TSS according to the latest version of
Q's stormwater Best Management Practices manual at a minimum.
~'~'` Additionally, in watersheds within one mile and draining to 303(d) listed waters, as well as
! watersheds that are classified as nutrient sensitive waters (NSW), water supply waters
(WS), trout Ovate (Tr), high quality waters (HQW), and outstanding resource waters
(ORW), the Divis on shall require that extended detention wetlands, bio-retention areas,
and ponds folio d by forested filter strips (designed according to latest version of the NC
DENR Stormwa r Best Management Practices Manual) be constructed as part of the
stormwater ma agement plan when asite-specific stormwater management plan is
required.
For str s classified as Water Supply, High Quality Waters and Outstanding Resource
rs, post-construction, on-site stormwater management shall be required as
appropriate and as outlined in 15A NCAC 26 .0104(m) and 2H .1000 to .1007,
respectively, in addition to that required in this General Certification.
Alternative designs may be requested by the applicant and will be reviewed on a case-by-
case basis by the Division of Water Quality.
Approval of stormwater management plans by the Division of Water Quality's other
existing state stormwater programs including appropriate local programs are sufficient to
satisfy this Condition as long as the stormwater management plans meet or exceed the
design requirements specified in this condition. This condition applies unless more
stringent requirements are in effect from other state water quality programs.
• Unless specified otherwise in the approval letter, the final, written stormwater
management plan shall be approved in writing by the Division of Water Quality's
Wetlands Unit before the impacts specified in this Certification occur.
• The facilities must be designed to treat the runoff from the entire project, unless
otherwise explicitly approved by the Division of Water Quality.
• Also, before any permanent building or other structure is occupied at the subject site,
the facilities (as approved by the Wetlands Unit) shall be constructed and operational,
and the stormwater management plan (as approved by the Wetlands Unit) shall be
implemented.
• The structural stormwater practices as approved by the Wetlands Unit as well as
drainage patterns must be maintained in perpetuity.
• No changes to the structural stormwater practices shall be made without written
authorization from the Division of Water Quality.
5. Compensatory stream mitigation shall be required at a 1:1 ratio for not only perennial but
also intermittent stream impacts that require application to DWQ in watersheds classified
as ORW, HQW, Tr, WS-I and WS-II unless the project is a linear, publicly-funded
transportation project, which has a 150-foot per-stream impact allowance;
6. In accordance with North Carolina General Statute Section 143-215.3D(e), any
application fora 401 Water Quality Certification must include the appropriate fee. If a

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