[Ord. No. 1-2011, 5/10/2011]
1.
For any regulated activity within a protected watershed (high quality
or exceptional value), the applicant shall meet requirements as contained
in 25 Pa. Code Chapter 93, as required and applicable.
2.
An existing resources and site analysis plan shall be prepared to
provide the developer and the municipality with a comprehensive analysis
of existing conditions, both on the proposed development site and
within 500 feet of the site. Conditions beyond the parcel boundaries
may be described on the basis of existing published data available
from governmental agencies and from aerial photographs. The municipality
shall review the plan to assess its accuracy, conformance with municipal
ordinances, and likely impact upon the natural and cultural resources
on the property. The following information shall be required:
A.
Complete current perimeter boundary survey of the property to be
subdivided or developed, prepared by a registered surveyor, showing
all courses, distances, and area and tie-ins to all adjacent intersections.
B.
A vertical aerial photograph enlarged to a scale not less detailed
than one inch equals 400 feet, with the site boundaries clearly marked.
C.
Natural features, including:
(1)
Contour lines at intervals of not more than two feet. (Ten-foot
intervals are permissible beyond the parcel boundaries, interpolated
from USGS published maps.) Contour lines shall be based on information
derived from a topographic survey for the property, evidence of which
shall be submitted, including the date and source of the contours.
Data to which contour elevations refer and references to known, established
benchmarks and elevations shall be included on the plan.
(2)
Steep slopes in the following ranges: 15% to 25%, 25% and greater.
The locations of these slopes shall be graphically depicted by category
on the plan. Slope shall be measured over three or more two-foot contour
intervals.
(3)
Areas within the floodway, flood fringe, and approximated floodplain.
(4)
Watercourses, either continuous or intermittent and named or
unnamed, and lakes, ponds or other water features as depicted on the
USGS Quadrangle Map, most current edition.
(5)
Wetlands and wetland margins.
(6)
Riparian buffers.
(7)
Soil types and their boundaries, as mapped by the USDA Natural
Resource Conservation Service, including a table listing the soil
characteristics pertaining to suitability for construction and, in
unsewered areas, for septic suitability. Alluvial and hydric soils
shall specifically be depicted on the plan.
(8)
Existing vegetation, denoted by type, including woodlands, hedgerows,
tree masses, tree lines, individual freestanding trees over six inches
DBH, wetland vegetation, pasture- or croplands, orchards, permanent
grassland, old fields, and any other notable vegetative features on
the site. Vegetative types shall be described by plant community,
relative age, and condition.
(9)
Any identified Pennsylvania Natural Diversity Inventory (PNDI)
site conflicts.
(10)
Geologic formations on the tract, including rock outcroppings,
cliffs, sinkholes, and fault lines, based on available published information
or more detailed data obtained by the applicant.
D.
Existing man-made features, including:
(1)
Location, dimensions, and use of existing buildings and driveways.
(2)
Location, names, widths, center line courses, paving widths,
identification numbers, and rights-of-way of existing streets and
alleys.
(3)
Location of trails that have been in public use (pedestrian,
equestrian, bicycle, etc.).
(4)
Location and size of existing sanitary sewage facilities.
(5)
Location and size of drainage facilities.
(6)
Location of water supply facilities, including wellhead protection
areas.
(7)
Any easements, deed restrictions, rights-of-way, or any other
encumbrances upon the land, including location, size, and ownership.
(8)
Site features or conditions such as hazardous waste, dumps,
underground tanks, active and abandoned wells, quarries, landfills,
sand mounds, and artificial land conditions.
E.
Total acreage of the tract, the adjusted tract area, where applicable,
and the constrained land area with detailed supporting calculations.
3.
Stormwater Management System Concept Plan. A written and graphic
concept plan of the proposed post-development stormwater management
system shall be prepared and include:
A.
Preliminary selection and location of proposed structural stormwater
controls;
B.
Location of existing and proposed conveyance systems such as grass
channels, swales, and storm drains;
C.
Location of floodplain/floodway limits;
D.
Relationship of site to upstream and downstream properties and drainages.
E.
Preliminary location of proposed stream channel modifications, such
as bridge or culvert crossings.
4.
Consultation Meeting. Prior to any stormwater management permit application
submission, the landowner or developer shall meet with the municipality
for a consultation meeting on a concept plan for the post-development
stormwater management system to be utilized in the proposed project.
This consultation meeting shall take place at the time of the preliminary
plan or other early step in the development process. The purpose of
this meeting is to discuss the post-development stormwater management
measures necessary for the proposed project, as well as to discuss
and assess constraints, opportunities and potential ideas for stormwater
management designs before the formal site design engineering is commenced.
5.
All proposed regulated activities within a protected watershed shall
utilize, to the maximum extent possible, low impact development practices
as contained in Appendix B.[1]
A.
The SWM plan and report shall address the following:
(1)
Design using nonstructural BMPs.
(a)
Lot configuration and clustering.
(b)
Minimum disturbance.
1)
Define disturbance zones (excavation/grading) for the site and
individual lots to protect maximum total site area from disturbance.
2)
Barriers/flagging proposed to protect designated nondisturbance
areas.
3)
Considered mitigative practices for minimal disturbance areas
(e.g., soil restoration).
4)
Considered reforestation and revegetation opportunities.
(2)
Apply a structural BMP selection process that meets runoff quantity
and quality needs.
(a)
Manage close to source with collection with conveyance minimized.
(b)
Consistent with site factors (e.g., soils, slope, available
space, amount of sensitive areas, pollutant removal needs).
(c)
Minimize footprint and integrate into already disturbed areas/other
building program components (e.g., recharge beneath parking areas,
vegetated roofs).
(d)
Consider other benefits such as aesthetic, habitat, recreational
and educational benefits.
(e)
BMPs selected based on maintenance needs that fit owner/users.
(f)
BMPs, sustainable using a long-term maintenance plan.
[1]
Editor's Note: Appendix B, Low Impact Development Practices, is included as an attachment to this chapter.
