For all regulated activities not eligible for exemptions pursuant to §
266-2.3 of this chapter, the applicant shall submit a stormwater management plan and report prepared by a professional engineer, licensed in the Commonwealth of Pennsylvania, which shall contain, but not be limited to, the following. (Final copies of all plans, specifications and reports shall also be submitted to the Township in Adobe PDF format.)
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. The site must also be shown on a watershed
key map, as found in Appendix A, indicating the location of the site within the Pine Creek
or Deer Creek watersheds.
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 offsite improvements;
for slopes greater than 15%, five-foot contours are acceptable).
E. Notes pertaining to and locations of existing standing water, areas
of heavy seepage, springs, wetlands, streams, and hydrologically sensitive
areas. The Chapter 93 Water Quality Standards use designation must
also be provided on the plan.
F. General type of soils within the drainage areas with hydrologic soil
groups noted. The estimated permeabilities in inches per hour and
location and results of all soil tests and borings (if needed) should
also be shown on the plan.
G. One-hundred-year flood elevations for any special flood hazard areas
on or within 100 feet of the property. For redevelopment sites, also
show the ten- and fifty-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. Current ground
cover and land use should be based on the latest aerial photography
of the area.
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. Completion of PA BMP Manual Checklists 11, 12, and 13 satisfying
the pollution prevention requirements set forth in the BMP Manual.
M. 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.
N. A plan of the erosion and sedimentation procedures to be utilized
as required by Township ordinance and state regulations.
O. The effect of the project (in terms of runoff volumes and peak flows)
on adjacent properties and on any other stormwater collection system
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.
P. An impervious area flash analysis for the site shall be performed
showing the effects of runoff from only the impervious areas of the
site.
Q. A plan showing the proposed grading and projected house locations
to assure that upslope runoff is not directed toward new or existing
homes. Drainage paths and slopes should be shown on this plan to clearly
convey the intent of the grading plan.
R. An operation and maintenance plan consistent with the requirements of Article
V. Such a plan should clearly explain how the proposed facilities operate and the functions they serve.
S. 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.
T. A North arrow, submission date, graphic scale and revision dates
as applicable shall be included on each page of all plans submitted.
U. Complete delineation of the flow paths used for calculating the time
of concentration for the predeveloped and post-developed conditions.
V. Construction details sufficient to completely express the intended
stormwater design components consistent with this chapter.
W. Floodplain boundaries for the 100-year frequency storm are to be
shown for all waterways with a drainage area of 150 acres or greater.
X. A listing of all permits required for the site providing the status
of the permit application(s) and approval(s).
Y. All adjacent property owners shall be notified of the project and
its stormwater and BMP installation. This notification shall be performed
by the applicant. Legal proof of this notification must be provided
to the Township.
Z. SWM site plans approved by the municipality, in accordance with Article
VI, shall be on site throughout the duration of the regulated activity.
AA. The following signature block for the Township shall appear on all
stormwater plans and/or reports:
"(Municipal official or Designated Plan Reviewer (§ 266-6.5), on this date (Signature date), has reviewed and hereby certifies that the SWM site plan meets all design standards and criteria of the Municipal 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."
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