[Ord. 2011-03, 2/3/2011, Art. 4]
For any of the regulated activities of this Chapter 23B, 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 municipal approval of the plan.
[Ord. 2011-03, 2/3/2011, Art. 4]
Exemptions from the drainage plan requirements are as specified in § 23B-106.
[Ord. 2011-03, 2/3/2011, Art. 4]
1.
The following items shall be included in the drainage plan:
B.
Map(s) of the project area showing:
(1)
The location of the project relative to highways, municipalities
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 features including flood hazard boundaries, existing drainage
swales, wetlands, closed depressions, sinkholes and areas of natural
vegetation to be preserved.
(5)
Locations of proposed underground utilities, sewers, and water
lines. The locations of all existing arid proposed utilities, sanitary
sewers and water lines within 50 feet of property lines of the project
site.
(6)
An overlay showing soil types and boundaries based on the county
soil survey, as applicable, latest edition. Any hydric soils present
on the site should be identified as such.
(7)
An overlay showing geologic types, boundaries and any special
geologic features present on the site.
(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 the Township 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 roof-top storage, semi-pervious
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)
All details and specifications for the construction of the stormwater
management controls and BMPs.
D.
The BMP operations and maintenance plan, as required in Part 7, describing
how each permanent stormwater BMP will be operated and maintained
and the identity of the person(s) responsible for operations and maintenance.
A statement must be included, signed by the landowner, acknowledging
that the stormwater BMPs are fixtures that cannot be altered or removed
without approval by the Township.
E.
A plan and narrative showing how storm water, accumulating on or
passing through the tract or tracts upon which regulated activities
will be conducted, will be transported or transmitted from the subject
tract or tracts to a water course with a generally permanent flow
(such as a stream); showing the hydraulic capacities of all facilities
located between said tract or tracts and the stream impacted by the
storm water; and identifying limitations upon such facilities which
may limit the proper transportation or transmission of such storm
water to the stream.
[Ord. 2011-03, 2/3/2011, Art. 4]
1.
For regulated activities specified in § 23B-105, Subsection 2A and B:
A.
The drainage plan shall be submitted by the developer to the Township
as part of the preliminary plan submission for the subdivision or
land development.
C.
Drainage plans involving more than 10,000 square feet of additional
impervious cover shall be submitted by the developer to the LVPC as
part of the preliminary plan submission. The LVPC will conduct an
advisory review of the drainage plan for consistency with the Perkiomen
Creek Headwaters Watershed Stormwater Management Plan. The LVPC will
not review details of the erosion and sedimentation plan or the BMP
operations and maintenance plan.
(1)
Two copies of the drainage plan shall be submitted to the LVPC.
(2)
The LVPC will provide written comments to the developer and
the Township, within a time frame consistent with established procedures
under the Pennsylvania Municipalities Planning Code, as to whether
the drainage plan has been found to be consistent with the stormwater
management plan.
2.
For regulated activities specified in § 23B-105, Subsection 2C and D, the drainage plan shall be submitted by the developer to the Township building permit officer as part of the building permit application.
3.
For regulated activities specified in § 23B-105, Subsection 2E, F and G:
A.
The drainage plan shall be submitted by the developer to the LVPC
for coordination with the DEP permit application process under Chapter
105 (Dam Safety and Waterway Management), Chapter 106 (Flood Plain
Management) of DEP's Rules and Regulations and the NPDES regulations.
B.
One copy of the drainage plan shall be submitted.
[Ord. 2011-03, 2/3/2011, Art. 4]
1.
The Township shall review the drainage plan, including the BMP operations and maintenance plan where applicable, for consistency with this Chapter 23B. The Township shall also review the drainage plan against any additional storm drainage provisions contained in the Lower Macungie Subdivision and Land Development Ordinance [Chapter 22] or Zoning Ordinance [Chapter 27], as applicable.
2.
The Township shall notify the applicant in writing whether the drainage
plan, including the BMP operations and maintenance plan, is approved,
consistent with timeframes as established by the applicable provisions
of the MPC.
4.
The Township requires an "as-built survey" of all stormwater facilities
including BMPs and an explanation of any discrepancies with the drainage
plan.
[Ord. 2011-03, 2/3/2011, Art. 4]
A modification to a drainage plan for a proposed development site which involves a change in control methods or techniques 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 Township) shall require a resubmission of the modified drainage plan consistent with § 23B-404 subject to review per § 23B-405 of this Chapter 23B.
[Ord. 2011-03, 2/3/2011, Art. 4]
1.
The Township may hear requests for waivers where it is alleged that the provisions of this Chapter 23B inflict unnecessary hardship upon the applicant. The waiver request shall be in writing and accompanied by the requisite fee based upon the Township fee schedule. A copy of the waiver request shall be provided to each of the following: the Township, Township Engineer, Township Solicitor and LVPC. The request shall fully document the nature of the alleged hardship. The Township may grant a waiver provided that all of the following findings are made in a given case:
A.
There are unique physical circumstances or conditions, including irregularity of lot size or shape or exceptional topographical or other physical conditions peculiar to the particular property and that the unnecessary hardship is due to such conditions and not the circumstances or conditions generally created by the provisions of this Chapter 23B in the Stormwater Management District in which the property is located.
B.
Because of such physical circumstances or conditions, there is no possibility that the property can be developed in strict conformity with the provisions of this Chapter 23B and that the authorization of a waiver is therefore necessary to enable the reasonable use of the property.
C.
Such unnecessary hardship has not been created by the applicant.
D.
The waiver, if authorized, will represent the minimum waiver that
will afford relief and will represent the least modification possible
of the regulation at issue.
E.
Financial hardship is not the criteria for granting of a hardship
waiver.
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In granting any waiver, the Township may attach such conditions and safeguards as it may deem necessary to implement the purposes of this Chapter 23B. If a hardship waiver is granted, the applicant must still manage the rate, volume as set forth in § 23B-304, Subsection 2, and quality of resulting storm runoff.
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2.
For regulated activities described in § 23B-105, Subsection 2A and B, the Board of Commissioners shall hear requests for and decide on hardship waiver requests on behalf of the Township.
