A.
Whenever an applicant seeks municipal approval of a development subject to this Part VII, the applicant shall submit all of the required components of the checklist for the site development stormwater plan at § 11-332.2 below as part of the submission of the application for approval.
B.
The applicant shall demonstrate that the project meets the standards
set forth in this Part VII.
The applicant's site development project shall be reviewed
as a part of the review process by the municipal board or official
from which municipal approval is sought. That municipal board or official
shall consult the municipality's review engineer to determine
if all of the checklist requirements have been satisfied and to determine
if the project meets the standards set forth in this Part VII.
Submission of site development stormwater plan. The following
information shall be required:
A.
Topographic base map. The reviewing engineer may require upstream
tributary drainage system information as necessary. It is recommended
that the topographic base map of the site be submitted which extends
a minimum of 200 feet beyond the limits of the proposed development,
at a scale of one inch equals 200 feet or greater, showing two-foot
contour intervals. The map as appropriate may indicate the following:
existing surface water drainage, shorelines, steep slopes, soils,
erodible soils, perennial or intermittent streams that drain into
or upstream of the Category One waters, wetlands and floodplains along
with their appropriate buffer strips, marshlands and other wetlands,
pervious or vegetative surfaces, existing man-made structures, roads,
bearing and distances of property lines, and significant natural and
man-made features not otherwise shown.
B.
Environmental site analysis. A written and graphic description of
the natural and man-made features of the site and its surroundings
should be submitted. This description should include a discussion
of soil conditions, slopes, wetlands, waterways and vegetation on
the site. Particular attention should be given to unique, unusual,
or environmentally sensitive features and to those that provide particular
opportunities or constraints for development.
C.
Project description and site plans. A map (or maps) at the scale
of the topographical base map indicating the location of existing
and proposed buildings, roads, parking areas, utilities, structural
facilities for stormwater management and sediment control, and other
permanent structures. The map(s) shall also clearly show areas where
alterations will occur in the natural terrain and cover, including
lawns and other landscaping, and seasonal high groundwater elevations.
A written description of the site plan and justification for proposed
changes in natural conditions shall also be provided.
D.
Land use planning and source control plan. This plan shall provide a demonstration of how the goals and standards of §§ 11-331.1 through 11-331.4 are being met. The focus of this plan shall be to describe how the site is being developed to meet the objective of controlling groundwater recharge, stormwater quality and stormwater quantity problems at the source by land management and source controls whenever possible.
E.
Stormwater management facilities map. The following information,
illustrated on a map of the same scale as the topographic base map,
shall be included:
(1)
Total area to be disturbed, paved or built upon, proposed surface
contours, land area to be occupied by the stormwater management facilities
and the type of vegetation thereon, and details of the proposed plan
to control and dispose of stormwater.
(2)
Details of all stormwater management facility designs, during
and after construction, including discharge provisions, discharge
capacity for each outlet at different levels of detention and emergency
spillway provisions with maximum discharge capacity of each spillway.
F.
Calculations.
(1)
Comprehensive hydrologic and hydraulic design calculations for the pre-development and post-development conditions for the design storms specified in § 11-331.2 of this Part VII.
(2)
When the proposed stormwater management control measures depend
on the hydrologic properties of soils or require certain separation
from the seasonal high water table, then a soils report shall be submitted.
The soils report shall be based on on-site boring logs or soil pit
profiles. The number and location of required soil borings or soil
pits shall be determined based on what is needed to determine the
suitability and distribution of soils present at the location of the
control measure.
G.
Maintenance and repair plan. The design and planning of the stormwater
management facility shall meet the maintenance requirements of Article
45.
H.
Waiver from submission requirements. The municipal official or board
reviewing an application under this Part VII may, in consultation
with the municipality's review engineer, waive submission of
any of the requirements in § 11-332.2A(1) through (6) of
this Part VII when it can be demonstrated that the information requested
is impossible to obtain or it would create a hardship on the applicant
to obtain and its absence will not materially affect the review process.
