No application for approval of a land development
activity shall be reviewed until the appropriate officer or board
has received a stormwater pollution prevention plan (SWPPP) prepared
in accordance with the specifications in this chapter. The submittal
shall include:
A. The appropriate application forms;
B. Fees in accordance with the Town of LaGrange fee schedule
(most current);
C. The plans and materials described below;
D. The SWPPP requirements and contents, described below;
and
E. The performance and design criteria set forth elsewhere
herein.
All SWPPPs shall provide the following background
information and erosion and sediment controls. Plans shall be at a
scale no less detailed than one inch equals 50 feet and should be
prepared by and bear the name, signature and seal of a professional
engineer, registered architect, landscape architect or certified professional,
as required by law and licensed by the State of New York. Plans prepared
at larger scales, showing more detail, may be required by the Town's
Consulting Engineer and/or other consultant, as necessary. Elements
of such plans and related studies and materials may be prepared by
other designers or technicians as authorized by law and noted on the
documents submitted. The professional preparing the plan shall certify
that the design of all stormwater management practices (SMPs) meets
the requirements in this chapter. The following information and plans
shall be provided:
A. Background information about the scope of the project,
including location, type and size of project.
B. Site map/construction drawing(s) for the project,
including a general location map. At a minimum, the site map should
show the total site area; all improvements; areas of disturbance;
areas that will not be disturbed; existing vegetation; on-site and
adjacent off-site surface water(s); wetlands and drainage patterns
that could be affected by the construction activity; existing and
final slopes; locations of off-site material, waste, borrow or equipment
storage areas; and location(s) of the stormwater discharges(s);
C. Description of the soil(s) present at the site;
D. Construction phasing plan describing the intended
sequence of construction activities, including tree removal, stumping,
clearing and grubbing, excavation and grading, utility and infrastructure
installation and any other activity at the site that results in soil
disturbance. Consistent with the New York Standards and Specifications
for Erosion and Sediment Control ("Erosion Control Manual"), not more
than five acres shall be disturbed at any one time without written
approval from the NYSDEC.
E. Description of the pollution prevention measures that
will be used to control litter, construction chemicals and construction
debris from becoming a pollutant source in stormwater runoff;
F. Description of construction and waste materials expected
to be stored on site with updates as appropriate, and a description
of controls to reduce pollutants from these materials including storage
practices to minimize exposure of the materials to stormwater, and
spill-prevention and response;
G. Temporary and permanent structural and vegetative
measures to be used for soil stabilization, runoff control and sediment
control for each stage of the project, from initial land clearing
and grubbing to project closeout;
H. A site map/construction drawing(s) specifying the
location(s), size(s) and length(s) of each erosion and sediment control
practice;
I. Dimensions, material specifications and installation
details for all erosion and sediment control practices, including
the siting, sizing and supporting calculations of any temporary sediment
basins;
J. Temporary practices that will be converted to permanent
control measures;
K. Implementation schedule for staging temporary erosion
and sediment control practices, including the timing of initial placement
and duration that each practice should remain in place;
L. Inspection and maintenance schedule to ensure continuous
and effective operation of the erosion and sediment control practice;
M. Name(s) of the receiving water(s);
N. Delineation of SWPPP implementation responsibilities
for each part of the site;
O. Description of structural practices designed to divert
flows from exposed soils, store flows, or otherwise limit runoff and
the discharge of pollutants from exposed areas of the site to the
degree attainable;
P. Any existing data that describes the stormwater runoff
at the site;
Q. A completed notice of intent (NOI). Said NOI shall
be submitted to the NYSDEC and the Town to obtain SPDES General Construction
Permit GP-02-01 coverage prior to commencement of construction. Proof
of coverage shall be submitted to the SMO and the Planning Board,
prior to final approval and prior to endorsement of the subdivision
plat, special use permit, or site plan by the Planning Board Chairman.
Land development activities as defined in §
197-4 and meeting at least one of the three conditions in subsection A, below, (i.e., Condition A, B or C) shall also include water quantity and water quality controls (postconstruction stormwater runoff controls) as set forth in Subsection B below as applicable:
A. Conditions.
(1) Condition A: stormwater runoff from land development
activities discharging a pollutant of concern to either an impaired
water identified on the Department's 303(d) list of impaired water
bodies or a total maximum daily load (TMDL) designated watershed for
which pollutants in stormwater have been identified as a source of
the impairment; or
(2) Condition B: stormwater runoff from land development
activity disturbing between one and five acres of land during the
course of the project, exclusive of the construction of single-family
residences and construction activities at agricultural properties;
or
(3) Condition C: stormwater runoff from land development
activities disturbing five or more acres.
B. SWPPP requirements for land development activities
that meet Condition A, B or C, above:
(1) All information in §
197-8 of this chapter.
(2) Description of each postconstruction stormwater management
practice;
(3) Site map/construction drawing(s) showing the specific
location(s) and size(s) of each postconstruction stormwater management
practice;
(4) Hydrologic and hydraulic analysis for all structural
components of the stormwater management system for the applicable
design storms;
(5) Comparison of postdevelopment stormwater runoff conditions
with predevelopment conditions. The comparison shall include peak
flows for the one-, ten-, and one-hundred-year design storm;
(6) Dimensions, material specifications and installation
details for each postconstruction stormwater management practice;
(7) Inspection and maintenance schedule to ensure continuous
and effective operation of each postconstruction stormwater management
practice.
(8) Maintenance easements to ensure access to all stormwater management practices at the site for the purpose of inspection and repair. Easements shall be recorded on the plan and shall comply in all respects with §
197-14 of this chapter.
(9) Inspection and maintenance agreement binding on all subsequent landowners served by the on-site stormwater management measures in accordance with §
197-16 of this chapter.
(10) The SWPPP shall be prepared by a landscape architect,
certified professional or professional engineer and must be signed
by the professional preparing the plan, who shall certify that the
design of all stormwater management practices meet the requirements
in this chapter.
The applicant shall provide proof, to the satisfaction
of the SMO (in consultation with Town's Consulting Engineer, the Administrator
of Public Works, and/or other consultant), that all other applicable
environmental permits have been acquired for the land development
activity prior to approval of the final stormwater pollution prevention
plan (SWPPP).