Except as provided in §§
148-13 and
148-14, the stormwater management plan consists of two parts: a map or maps describing the topography of the area, the proposed alteration to the area and the erosion and sedimentation control measures and facilities and the permanent stormwater control measures and facilities; and a narrative report describing the project and giving the purpose and the engineering assumptions and calculations for control measures and facilities. The following elements, where relevant, shall be included in the map and narrative portions of the plan:
A. A general statement of the project must be included
in the narrative, including:
(1) A general description of the project;
(2) A general description of accelerated erosion control;
(3) A general description of sedimentation control;
(4) A general description of stormwater handling, both
during and after construction; and
(5) The date that the project is to begin and the expected
date that final stabilization will be completed.
B. The topographic features of the project area must
be shown on the map, including:
(1) The location of the project relative to highways,
municipalities or other identifiable landmarks.
(2) Contours at an interval prescribed by the Township
Engineer (generally two feet for subdivision and land development)
that will adequately describe the topography (indicate source of topographic
information and date).
(3) Boundary lines of the project area.
(5) Streams, lakes, ponds or other bodies of water within
the project area or in the vicinity of the project.
(6) Other physical features, including existing drainage
swales and areas of trees and shrubs to be protected during construction.
(7) Proposed location of underground utilities and sewer
and/or water lines.
(8) Scale of map and north arrow.
(9) Existing roads and easements.
C. The types, depth, slope and areal extent of the soils
and underlying geology must be shown on the map, including:
(1) The type (may be specified as in a soil survey or
by name), depth, slope, texture and structure; and
D. The proposed alteration to the area must be shown
on the map, including:
(1) Changes to land surface and vegetative cover;
(3) Structures, roads, paved areas and buildings;
(4) Stormwater control facilities; and
(5) Contours of finished area at an interval that will
adequately describe the final topography.
E. The amount of runoff from the project area and the
upstream watershed area must be described in the narrative, including:
(1) The method of calculation and figures used; and
F. The staging of earthmoving activities must be described
in the narrative, including:
(1) Cover removal, including all cuts and fills;
(2) Installation of erosion and sediment control facilities
and practices;
(3) Installation of improvements, including streets, storm
sewers, underground utilities, sewer and water lines, buildings, driveways,
parking areas, recreational facilities, other structures, etc.; and
(4) The program of operations to control erosion and sedimentation
and convert to permanent stormwater management facilities, including
a chart of the relative time sequence of activities.
G. Temporary control measures and facilities for use
during earthmoving must be shown on the map and described in the narrative,
including:
(2) Temporary facilities or other soil stabilization measures
to protect existing trees and shrubs from earthmoving activities;
(3) Types, locations and dimensioned details of control
measures and facilities;
(4) Design consideration and calculations of control measures
and facilities; and
(5) Facilities to prevent tracking of mud by construction
vehicles onto existing roadways.
H. Permanent control and groundwater recharge measures
and facilities for site restoration and long-term protection must
be shown on the map and described in the narrative, including:
(2) Establishment of permanent vegetation or other soil
stabilization measures;
(3) Installation of infiltration facilities, rooftop storage,
cisterns, seepage pits, french drains, etc., to serve structures;
(4) Use of semipervious materials for driveways, parking
areas, etc.;
(5) Types, locations and dimensioned details of facilities
for stormwater detention and storage;
(6) Location of wells and septic tank leach fields;
(7) Design considerations and calculations; and
(8) Conversion of erosion and sediment control facilities
to permanent stormwater management facilities.
I. A maintenance program and ownership descriptions for
the control facilities must be described in the narrative, including:
(1) The method of disposal of materials removed from the
control facilities or the project area;
(2) The method, frequency of removal and ultimate disposal
site for sediment and other materials removed from control facilities
must be considered. The facilities must be maintained for their designed
operation to ensure adequate performance;
(3) The proposed ownership and financial responsibility
for maintenance of the control facilities.