No person shall commence or carry out any minor land development
activity in the Town of Mamaroneck without first obtaining a surface
water and erosion control permit from the Building Department and
all other necessary municipal permits.
The following information shall be shown on a surface water
and erosion control plan unless otherwise noted:
A. The name of the development or identifying title. The name, address
and telephone number of the owner and/or developer of the site and
the consulting firm retained by the applicant for preparation of the
plan. If the applicant is a corporation, it must list the name, home
address and telephone number of at least two officers of the applicant.
A phone number for an emergency contact must also be provided.
B. The plan shall show the date of its preparation and all revision
dates, the approximate true North point and the scale, which shall
be no greater than one inch equals 50 feet.
C. The proposed site layout shall include:
(1) The boundary line and acreage for the site.
(3) A vicinity map that includes state and local wetlands.
(4) The location of existing buildings, structures, utilities, water
bodies, floodplains, drainage facilities, vegetative cover, paved
areas, watershed divides and other significant natural or man-made
features on the site and land within 250 feet of the boundary.
(5) A schematic layout of the stormwater management practices proposed
to control surface water runoff both during and after construction.
(6) A schematic layout of the proposed erosion and sediment control devices.
(7) Existing and proposed contours of the site and adjacent land within
approximately 250 feet of the boundaries, drawn at no greater than
two-foot contour intervals with critical spot elevations.
(8) Surface water control calculations using methods defined in "Technical
Release-55," "Technical Release-20," the Rational Method, or other
method approved by the Stormwater Management Officer, unless superseded
by a comprehensive local watershed and/or stormwater model and plan.
(9) Base flood elevation data using the most current National Geodetic
Vertical Datum.
(10)
Construction schedule showing the sequencing of the installation
of the required stormwater management practices, erosion and sediment
control devices and other site construction activities, which shall
be supplemented as directed by the Stormwater Management Officer to
show required inspections.
(11)
Signature block language, including the seal of a New York State
licensed professional engineer, registered architect, or a New York
State licensed landscape architect.
(12)
The location of existing trees, including driplines, grassy
areas and unique vegetation and detailed methods of tree protection.
(13)
Identification and boundaries of the different soil types existing
on the site.
(14)
The dividing lines and direction of flow for different drainage
areas.
(15)
Areas with potentially significant erosion problems.
(16)
Areas which are to be cleared and graded or used for storage.
(17)
Detailed drawings that explain and illustrate any structural
practices used that are not referenced to the design manuals.
D. In addition to complying with the requirements of Subsections
A,
B and
C, a minor land development activity meeting Condition One below (other than for the construction of a one- or two-family house) shall also include water quality and water quantity controls (post-construction stormwater runoff controls) as set forth in §
95-10E.
(1) Condition One: disturbance of an area greater than 5,000 square feet
but less than one acre or creating impervious surface area of 1,000
or more square feet, but less than one acre.
E. Surface water and erosion control plan for Condition One:
(1) Description of each post-construction stormwater management practice;
(2) Site map/construction drawing(s) showing the specific location(s)
and size(s) of each post-construction stormwater management practice;
(3) Hydrologic and hydraulic analysis for all structural components of
the stormwater management system for the applicable design storms;
(4) Comparison of post-development stormwater runoff conditions with
pre-development conditions;
(5) Dimensions, material specifications and installation details for
each post-construction stormwater management practice;
(6) Maintenance schedule to ensure continuous and effective operation
of each post-construction stormwater management practice;
(7) Maintenance easements to ensure access to all stormwater management
practices at the site for the purpose of inspection and repair, and
such easements shall be recorded on the plan and shall remain in effect
with transfer of title to the property; and
(8) Inspection and maintenance agreement binding on all subsequent landowners served by the on-site stormwater management measures in accordance with §
95-15.