The drainage plan shall consist of all applicable
calculations, drawings, maps, and plans. The cover sheet of the computations
and erosion and sedimentation control plan shall refer to the associated
maps by title and date. All drainage plan materials shall be submitted
to the Borough in a format that is clear, concise, legible, neat,
and well organized; otherwise, the drainage plan shall be disapproved
and returned to the applicant. The following items shall be included
in the drainage plan:
A. General.
(1) General description of project.
(2) General description of permanent stormwater management
techniques, including construction specifications of the materials
to be used for stormwater management facilities.
(3) Complete hydrologic, hydraulic, and structural computations
for all stormwater management facilities.
(4) Drainage plans shall be prepared by a professional
with demonstrated competency in stormwater management and design.
(5) Drainage plans and related documentation shall contain
the seal and signature of the professional that prepared the plans.
B. Drawings, maps and plans of the project area shall
be submitted on twenty-four-inch by thirty-six-inch sheets and shall
be prepared in a form that meets the requirements for recording at
the offices of the Recorder of Deeds of Union County. The contents
of the maps shall include, but not be limited to:
(1) The location of the project relative to highways,
municipalities or other identifiable landmarks.
(2) Existing contours at intervals of one foot. In areas
of steep slopes (greater than 15%), five-foot contour intervals may
be used.
(3) Existing streams, lakes, ponds, field delineated wetlands,
or other bodies of water within the project area.
(4) Other physical features including flood hazard boundaries,
sinkholes, streams, existing drainage courses, areas of natural vegetation
to be preserved, and the total extent of the upstream area draining
through the site.
(5) The locations of all existing and proposed utilities,
sanitary sewers, and water lines within 50 feet of property lines.
(6) An overlay showing soil names and boundaries.
(7) Proposed changes to the land surface and vegetative
cover, including the type and amount of impervious area that would
be added.
(8) Proposed structures, roads, paved areas, and buildings.
(9) Final contours at intervals of one foot. In areas
of steep slopes (greater than 15%), five-foot contour intervals may
be used.
(10)
The name of the development, the name and address
of the owner of the property, and the name of the individual or firm
preparing the plan.
(12)
A graphic and written scale of one inch equals
no more than 50 feet; for tracts of 20 acres or more, the scale shall
be one inch equals no more than 100 feet.
(14)
The total tract boundary and size with distances
marked to the nearest foot and bearings to the nearest degree.
(15)
Existing and proposed land use(s).
(16)
A key map showing all existing man-made features
beyond the property boundary that would be affected by the project.
(17)
Horizontal and vertical profiles of all open
channels, including hydraulic capacity.
(19)
A minimum fifteen-foot wide access easement
around all stormwater management facilities that would provide ingress
to and egress from a public right-of-way.
(20)
A note on the plan indicating the location and
responsibility for maintenance of stormwater management facilities
that would be located off-site. All off-site facilities shall meet
the performance standards and design criteria specified in this chapter.
(21)
A construction detail of any improvements made
to sinkholes.
(22)
A statement, signed by the landowner, acknowledging
the stormwater management system to be a permanent fixture that can
be altered or removed only after municipal approval of a revised plan.
(23)
The location of all erosion and sedimentation
control facilities.
(24)
Where pervious pavement is permitted for parking
lots, recreational facilities, non-dedicated streets or other areas,
pavement construction specifications shall be noted on the plan.
(25)
It shall be the applicant's responsibility to
verify if the site is underlain by limestone. The following note shall
be affixed to all drainage plans and signed and sealed by the engineer,
surveyor, landscape architect or geologist:
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I, ____________________, certify that this site
and any detention basins located thereon are/are not underlain by
limestone.
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C. Supplemental information.
(1) A written description of the following information
shall be submitted.
(a)
The overall stormwater management concept for
the project.
(b)
Stormwater runoff computations as specified
in this chapter.
(c)
Stormwater management techniques to be applied
both during and after development.
(d)
Expected project time schedule.
(2) A soil erosion and sedimentation control plan, where
applicable, including all reviews and approvals, as required by PA
DEP.
(3) A geologic assessment of the effects of runoff on
sinkholes as specified in this chapter.
(4) The effect of the project (in terms of runoff volumes
and peak flows) on adjacent properties and on any existing municipal
stormwater collection system that may receive runoff from the project
site.
(5) A Declaration of Adequacy and Highway Occupancy Permit
from the PennDOT District Office when utilization of a PennDOT storm
drainage system is proposed.
D. Stormwater management facilities.
(1) All stormwater management facilities must be located
on a plan and described in detail.
(2) When groundwater recharge methods such as seepage
pits, beds or trenches are used, the locations of existing and proposed
septic tank infiltration areas and wells must be shown.
(3) All calculations, assumptions, and criteria used in
the design of the stormwater management facilities must be shown.
A disapproved drainage plan may be resubmitted,
with the revisions addressing the Municipal Engineer's concerns documented
in writing, to the Borough Secretary in accordance with this chapter
and distributed accordingly and is subject to review as specified
in this chapter.