The applicant shall submit a stormwater management plan and report prepared by a professional engineer licensed in the Commonwealth of Pennsylvania for all regulated activities not eligible for exemptions pursuant to § 190-6 of this chapter. In addition to paper copies, copies of all final plans, specifications and reports shall also be submitted to the Township in Adobe PDF format. The stormwater management plan shall contain, but not be limited to, the following:
A.
A suitable map of the watershed for any and all named streams within
which the project is proposed (a United States Geological Survey quadrangle
map is usually sufficient) with existing and proposed development
areas presented on the map.
B.
Suitable maps and drawings showing all existing natural and constructed
drainage facilities affecting the subject property.
C.
Hydrologic (watershed) and water feature boundaries, including all
areas flowing to the proposed project, existing streams (including
first- order and intermittent streams), springs, lakes, ponds or other
bodies of water within the project area.
D.
Sufficient topographical information with elevations to verify the
location of all ridges, streams, etc. (two-foot contour intervals
within the project's boundaries and for proposed off-site improvements;
for slopes greater than 15%, five-foot contour intervals).
F.
General type of soils with hydrologic soil group noted, estimated
permeability in inches per hour, and location and results of all required
soil tests and borings.
G.
One-hundred-year flood elevations for any special flood hazard areas
on or within 100 feet of the property. For redevelopment sites, the
plan shall also show the ten-year and twenty-five-year flood elevations
for any special flood hazard areas on or within 100 feet of the property.
The source of these elevations shall also be shown on the plans.
H.
Description of current and proposed ground cover and land use. The
total area and percent impervious cover shall be noted.
I.
A wetland delineation report for the project site with a location
map identifying wetland areas if any were found.
J.
A plan of the proposed stormwater drainage system attributable to
the activity proposed, including runoff calculations, stormwater management
practices to be applied both during and after development, and the
expected project time schedule.
K.
The design computations for all proposed stormwater drainage systems,
including storm drain pipes, inlets, runoff control measures and culverts,
drainage channels, and other features, facilities and stormwater management
practices.
L.
A grading plan, including all areas of disturbance of the subject
activity. The total area of disturbance shall be noted in square feet
and acres. Topographic contours showing the existing and proposed
final contours at an interval of two feet; in areas having slope of
greater than 15%, a five-foot contour interval may be used.
M.
A plan of the erosion and sedimentation procedures to be utilized
as required by local ordinance and state regulations.
N.
The effect of the project (in terms of runoff volumes and peak flows)
on adjacent properties and on all other stormwater collection systems
that may receive runoff from the project site and specifics of how
erosion and flooding impacts to adjacent properties will be avoided
or otherwise mitigated.
O.
An operation and maintenance plan consistent with the requirements of Article V. Such a plan shall clearly explain how the proposed facilities operate and the functions they serve.
P.
The name of the development, the name and address of the property
owner and applicant, and the name and address of the individual or
firm preparing the plan.
Q.
A North arrow, the submission date, graphic scale and the revision
dates, as applicable, shall be included on each page of all plans
submitted.
R.
Complete delineation of the flow paths used for calculating the time
of concentration for the predeveloped and post-developed conditions.
S.
Construction details sufficient to express completely the intended
stormwater design components consistent with this chapter.
T.
A listing of all permits required for the site, providing the status
of the permit application(s) and approval(s).
U.
The following signature block for the Township:
"Township Engineer on this date (Signature date), has reviewed
and hereby certifies that the SWM site plan meets all design standards
and criteria of the Township Ordinance No. (number assigned to ordinance),
except where waivers have been granted as noted on the Plan. The review
is based on a survey and plan prepared by others and assumes that
all information is correct and valid as submitted."
