For any of the regulated activities of this chapter, prior to
the final approval of subdivision and/or land development plans, or
the issuance of any permit, or the commencement of any regulated earth
disturbance activity, the owner, subdivider, developer or his agent
shall submit a drainage plan and receive Borough approval of the Plan.
Exemptions from the drainage plan requirements are as specified in §
378-16.
The following items shall be included in the drainage plan:
A. General.
(1) General description of project.
(2) General description of proposed permanent stormwater controls.
(3) The name and address of the project site, the name and address of
the owner of the property, and the name of the individual or firm
preparing the drainage plan.
B. Map(s) of the project area, showing:
(1) The location of the project relative to highways, boroughs or other
identifiable landmarks.
(2) Existing contours at intervals of two feet. In areas of steep slopes
(greater than 15%), five-foot contour intervals may be used. Off-site
drainage areas impacting the project, including topographic detail.
(3) Streams, lakes, ponds or other bodies of water within the project
area.
(4) Other physical features including existing drainage swales, wetlands,
closed depressions, sinkholes and areas of natural vegetation to be
preserved.
(5) Locations of proposed underground utilities, sewers, and waterlines.
The locations of all existing and proposed utilities, sanitary sewers
and waterlines within 50 feet of property lines of the project site.
(6) An overlay showing soil types and boundaries based on the Northhampton
County Soil Survey, latest edition.
(7) An overlay showing geologic types and boundaries.
(8) Proposed changes to land surface and vegetative cover.
(9) Proposed structures, roads, paved areas and buildings.
(10)
Final contours at intervals of two feet. In areas of steep slopes
(greater than 15%), five-foot contour intervals may be used.
(11)
Stormwater management district boundaries applicable to the
site.
(12)
Clear identification of the location and nature of permanent
stormwater BMPs.
(13)
An adequate access easement around all stormwater BMPs that
would provide Borough ingress to and egress from a public right-of-way.
(14)
A schematic showing all tributaries contributing flow to the
site and all existing man-made features beyond the property boundary
that would be affected by the project.
(15)
The location of all public water supply wells within 400 feet
of the project and all private water supply wells within 100 feet
of the project.
C. Stormwater management controls and BMPs.
(1) All stormwater management controls and BMPs shall be shown on a map
and described, including:
(a)
Groundwater recharge methods such as seepage pits, beds or trenches.
When these structures are used, the locations of septic tank infiltration
areas and wells shall be shown.
(b)
Other control devices or methods such as rooftop storage, semipervious
paving materials, grass swales, parking lot ponding, vegetated strips,
detention or retention ponds, storm sewers, etc.
(2) All calculations, assumptions and criteria used in the design of
the BMPs shall be shown.
(3) All site testing data used to determine the feasibility of infiltration
on a site.
(4) A statement, signed by the landowner, acknowledging that the stormwater
BMPs are fixtures that cannot be altered or removed without approval
by the Borough.
D. A description of how each permanent stormwater BMP will be operated
and maintained and the identity of the person(s) responsible for operations
and maintenance.
A modification to a submitted drainage plan for a proposed development site which involves a change in control methods or techniques, or which involves the relocation or redesign of control measures, or which is necessary because soil or other conditions are not as stated on the drainage plan (as determined by the Borough) shall require a resubmission of the modified drainage plan consistent with §
378-21, subject to review per §
378-22 of this chapter.