A.
For any proposed development, the applicant shall submit a concept plan, a site development plan, and a final plan for stormwater management. The submittals shall include the minimum content specified in § 14:4-20 of this chapter and meet the requirements of the Design Manual and Article III, Stormwater Management Criteria, of this chapter.
B.
The Department shall review the stormwater management plans. Coordinated
comments will be provided that reflect input from all appropriate
agencies including, but not limited to, the District and the Department
of Land Use, Growth Management and Environment (LGE). All comments
shall be addressed and approval received at each submittal, if applicable,
before subsequent submissions.
A.
The applicant shall submit a concept plan that provides sufficient
information for an initial assessment of the proposed project and
whether stormwater management can be provided according to this chapter
and the Design Manual. Plans submitted for concept review shall include,
but are not limited to:
(1)
A map at a scale specified by the Department showing site location,
existing natural features, water and other sensitive resources, topography,
and natural drainage patterns;
(2)
The anticipated location of all proposed impervious areas, buildings,
roadways, parking, sidewalks, utilities, and other site improvements;
(3)
The location of the proposed limit of disturbance, erodible soils,
steep slopes, and areas to be protected during construction;
(4)
Preliminary estimates of stormwater management requirements, the
selection and location of ESD practices to be used, and the location
of all points of discharge from the site;
(5)
A narrative that supports the concept design and describes how
ESD will be implemented to the MEP; and
(6)
Any other information required by the Department.
B.
Following concept plan approval, the applicant shall submit a site
development plan that reflects comments received during the previous
review phase. Plans submitted for site development review shall be
of sufficient detail for a comprehensive evaluation of the proposed
stormwater management system and site grading and shall include:
(1)
All information provided during the concept plan review phase;
(2)
Any geotechnical investigations including soil maps, borings, site
specific recommendations, and any additional information necessary
for the preliminary stormwater management design;
(3)
Final site layout, exact impervious area locations and coverage areas,
proposed topography, delineated drainage areas at all points of discharge
from the site and stormwater volume computations for ESD practices
and/or other stormwater management systems;
(4)
A proposed sediment and erosion control plan that contains the construction
sequence, any phasing necessary to limit earth disturbances and impacts
to natural resources and an overlay plan showing the types and locations
of ESD and erosion and sediment control practices to be used;
(5)
A narrative that supports the site development design, describes
how ESD will be used to meet the minimum control requirements, and
justifies any proposed structural stormwater management measure; and
(6)
Any other information required by the Department.
C.
Following site development plan approval, the applicant shall submit
final erosion and sediment control and stormwater management plans
that reflect the comments received during the previous review phase.
Plans submitted for final review shall be of sufficient detail to
allow all approvals and permits to be issued according to the following:
(1)
Final sediment and erosion control plans shall be submitted according
to COMAR 26.17.01.05; and
(2)
Final stormwater management plans shall be submitted for approval
in the form of construction drawings and be accompanied by a report
that includes sufficient information to evaluate the effectiveness
of the proposed runoff control design.
(a)
Reports submitted for final stormwater management plan approval
shall include, but are not limited to:
[1]
Any geotechnical investigations including soil maps, borings,
site specific recommendations, and any additional information necessary
for the final stormwater management design;
[2]
Drainage area maps depicting predevelopment and post-development
runoff flow path segmentation and land use;
[3]
Hydrologic computations of the applicable ESD and unified sizing
criteria according to the Design Manual for all points of discharge
from the site;
[4]
Hydraulic and structural computations for all ESD practices
and structural stormwater management measures to be used;
[5]
A narrative that supports the final stormwater management design;
and
[6]
Any other information required by the Department.
(b)
Construction drawings submitted for final stormwater management
plan approval shall include, but are not limited to:
[1]
A vicinity map;
[2]
Existing and proposed topography and proposed drainage areas,
including areas necessary to determine downstream analysis for proposed
stormwater management facilities;
[3]
Any proposed improvements including location of buildings or
other structures, impervious surfaces, storm drainage facilities,
and all grading;
[4]
The location of existing and proposed structures and utilities;
[5]
Any easements and rights-of-way;
[6]
The delineation, if applicable, of the one-hundred-year floodplain
and any on-site wetlands;
[7]
Structural and construction details including representative
cross sections for all components of the proposed drainage system
or systems, and stormwater management facilities;
[8]
All necessary construction specifications;
[9]
A sequence of construction;
[10]
Data for total site area, disturbed area, new
impervious area, and total impervious area,
[11]
A table showing the ESD and unified sizing criteria
volumes required in the Design Manual;
[12]
A table of materials to be used for stormwater
management facility planting;
[13]
All soil boring logs and locations;
[14]
A maintenance and inspection schedule;
[15]
Certification by the owner/developer that all
stormwater management construction will be done according to this
plan;
[16]
An as-built certification signature block to be
executed after project completion; and
[17]
Any other information required by the Department.
D.
It is the responsibility of the applicant to obtain from adjacent
property owners any required easements or other necessary property
interests concerning flow of water. Approval of a stormwater management
plan does not create or affect any right to direct runoff onto adjacent
property without that property owner's permission.
A.
Stormwater management plans shall be prepared by a licensed professional
engineer, a licensed professional land surveyor, or a licensed landscape
architect in Maryland.
B.
If a stormwater BMP requires either a dam safety permit from the
Administration or small pond approval from the District, the design
shall be prepared by a licensed professional engineer in Maryland.
