For any of the activities regulated by this chapter, the preliminary
or final approval of subdivision and/or land development plans, the
issuance of any building or occupancy permit, or the commencement
of any earth disturbance activity may not proceed until the property
owner or applicant or his/her agent has received written approval
of a drainage plan from the Township of Maidencreek unless the project
qualifies for an exemption from the requirements to submit a drainage
plan.
The green infrastructure and low-impact development practices
provided in the BMP Manual shall be utilized for all regulated activities
wherever possible. Water volume controls shall be implemented using
the Design Storm Method in Subsection A or the Simplified Method in
Subsection B below. For regulated activity areas less than one acre
that do not require hydrologic routing to design the stormwater facilities,
this chapter establishes no preference for either methodology; therefore,
the applicant may select either methodology on the basis of economic
considerations, the intrinsic limitations on applicability of the
analytical procedures associated with each methodology and other factors.
A. The Design Storm Method (CG-1 in the BMP Manual) is applicable to
any size of regulated activity. This method requires detailed modeling
based on site conditions.
(1) Do not increase the post-development total runoff volume for all
storms equal to or less than the two-year, twenty-four-hour duration
precipitation.
(2) For modeling purposes.
(a)
Existing (predevelopment) nonforested pervious areas must be
considered meadow in good condition.
(b)
Existing impervious areas, when present, shall be considered
meadow in good condition in the model for existing conditions.
B. The Simplified Method (CG-2 in the BMP Manual) provided below is
independent of site conditions and should be used if the Design Storm
Method is not followed. This method is not applicable to regulated
activities greater than one acre or for projects that require design
of stormwater storage facilities. For new impervious surfaces:
(1) Stormwater facilities shall capture at least the first two inches
of runoff from all new impervious surfaces.
(2) At least the first one inch of runoff from new impervious surfaces
shall be permanently removed from the runoff flow, i.e., it shall
not be released into the surface waters of this commonwealth. Removal
options include reuse, evaporation, transpiration, and infiltration.
(3) Wherever possible, infiltration facilities should be designed to
accommodate infiltration of the entire permanently removed runoff;
however, in all cases at least the first 0.5 inch of the permanently
removed runoff should be infiltrated.
(4) This method is exempt from the requirements of §
182-23.
The Maiden Creek Watershed has been divided into stormwater
management districts as shown on the Management District Map in Appendix
D of this chapter. Corresponding release rate percentages associated with each storm shall follow the provisions of this chapter, §
182-16.
The drainage plan shall consist of a general description of the project including sequencing items described in §
182-12, calculations, maps and plans. A note on the maps shall refer to the associated computations and erosion and sediment control plan by title and date. The cover sheet of the computations and erosion and sediment control plan shall refer to the associated maps by title and date. All drainage plan materials shall be submitted to the Township of Maidencreek in a format that is clear, concise, legible, neat, and well organized; otherwise, the drainage plan shall not be accepted for review and shall be returned to the applicant. The following items shall be included in the drainage plan:
A. General.
(1) General description of the project including those areas described in §
182-12.
(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) An erosion and sediment control plan, including all reviews and approvals
by the Conservation District.
(5) A general description of nonpoint source pollution controls.
B. Maps. Map(s) of the project area shall be submitted on twenty-four-inch-by-thirty-six-inch sheets and/or shall be prepared in a form that meets the requirements for recording at the offices of the Recorder of Deeds of Berks County. If Chapter
190, Subdivision and land development (SALDO), of the Code of the Township of Maidencreek has more stringent criteria then the more stringent criteria shall apply. The contents of the map(s) 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 two feet. In areas of steep slopes
(greater than 15%), five-foot contour intervals may be used.
(3) Existing streams, lakes, ponds or other waters of the commonwealth
within the project area.
(4) Other physical features including flood hazard boundaries, stream
buffers, 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) Limits of earth disturbance, 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 two feet. 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)
Location of all open channels.
(18)
Overland drainage patterns and swales.
(19)
A twenty-foot wide access easement around all stormwater management
facilities that would provide ingress to and egress from a public
right-of-way.
(20)
The location of all erosion and sediment control facilities.
(21)
A note on the plan indicating the location and responsibility
for maintenance of stormwater management facilities that would be
located on/off-site. All on/off-site facilities shall meet the performance
standards and design criteria specified in this chapter.
(22)
The following statement, signed by the landowner, shall be provided
on the plan:
"I, (property owner), on this date (date of signature), acknowledges
that any revisions to the approved drainage plan must be approved
by the Township of Maidencreek and the Berks County Conservation District."
(23)
The following signature block for the design engineer:
"I, (design engineer), on this date (date of signature), hereby
certify that the drainage plan meets all design standards and criteria
of the Maiden Creek Watershed Act 167 Stormwater Management Ordinance."
C. Supplemental information.
(1) A written description of the following information shall be submitted.
(a)
The overall stormwater management concept for the project designed in accordance with §
182-12.
(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.
(e)
Development stages (project phases) if so proposed.
(f)
An operation and maintenance plan in accordance with §
182-34 of this chapter.
(2) An erosion and sediment control plan.
(3) 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.
D. Stormwater management facilities.
(1) All stormwater management facilities must be located on a plan and
described in detail.
(2) When infiltration facilities 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.
(4) A justification must be included in the SWM site plan if BMPs other
than green infrastructure methods and LID practices are proposed to
achieve the volume, rate and water quality controls under this chapter.
E. Responsibilities for operations and maintenance of stormwater controls
and BMPs.
(1) No regulated earth disturbance activities within the Township of
Maidencreek shall commence until approval by the Township of Maidencreek
of a stormwater control and BMP operations and maintenance plan which
describes how the permanent (e.g., post-construction) stormwater controls
and BMPs will be properly operated and maintained.
(2) The following items shall be included in the stormwater control and
BMP operations and maintenance plan:
(a)
Map(s) of the project area, in a form that meets the requirements
for recording at the offices of the Recorder of Deeds of Berks County,
and shall be submitted on twenty-four-inch-by-thirty-six-inch sheets.
The contents of the maps(s) shall include, but not be limited to:
[1]
Clear identification of the location and nature of permanent
stormwater controls and BMPs;
[2]
The location of the project site relative to highways, municipal
boundaries or other identifiable landmarks;
[3]
Existing and final contours at intervals of two feet, or others
as appropriate;
[4]
Existing streams, lakes, ponds, or other bodies of water within
the project site area;
[5]
Other physical features including flood hazard boundaries, sinkholes,
streams, existing drainage courses, and areas of natural vegetation
to be preserved;
[6]
The locations of all existing and proposed utilities, sanitary
sewers, and water lines within fifty feet of property lines of the
project site;
[7]
Proposed final changes to the land surface and vegetative cover,
including the type and amount of impervious area that would be added;
[8]
Proposed final structures, roads, paved areas, and buildings;
and
[9]
A twenty-foot-wide access easement around all stormwater controls
and BMPs that would provide ingress to and egress from a public right-of-way.
(b)
A description of how each permanent stormwater control and BMP
will be operated and maintained, and the identity of the person(s)
responsible for operations and maintenance;
(c)
The name of the project site, the name and address of the owner
of the property, and the name of the individual or firm preparing
the plan; and
(d)
The following statement, signed by the landowner, shall be provided
on the plan:
"I, (property owner), acknowledge that the stormwater controls
and BMPs are permanent fixtures that can be altered or removed only
after approval by the Township of Maidencreek."
(3) The stormwater control and BMP operations and maintenance plan for
the project site shall establish responsibilities for the continuing
operation and maintenance of all permanent stormwater controls and
BMPs, as follows:
(a)
If a plan includes structures or lots which are to be separately
owned and in which streets, sewers and other public improvements are
to be dedicated to the Township of Maidencreek, stormwater controls
and BMPs may also be dedicated to and maintained by the Township of
Maidencreek;
(b)
If a plan includes operations and maintenance by a single ownership,
or if sewers and other public improvements are to be privately owned
and maintained, then the operation and maintenance of stormwater controls
and BMPs shall be the responsibility of the owner or private management
entity.
(4) The Township of Maidencreek shall make the final determination on
the continuing operations and maintenance responsibilities. The Township
of Maidencreek reserves the right to accept or reject the operations
and maintenance responsibility for any or all of the stormwater controls
and BMPs.
F. Municipality review of stormwater control and BMP operations and
maintenance plan.
(1) The Township of Maidencreek shall review the stormwater control and
BMP operations and maintenance plan for consistency with the purposes
and requirements of this chapter, and any permits issued by DEP.
(2) The Township of Maidencreek shall notify the applicant in writing
whether the stormwater control and BMP operations and maintenance
plan is approved.
(3) The Township of Maidencreek may require a record drawing of all stormwater
controls and BMPs, and an explanation of any discrepancies with the
operations and maintenance plan.
The Township of Maidencreek shall require receipt of a complete plan, as specified in this chapter. For any activities that require an NPDES permit for stormwater discharges from construction activities, a Pennsylvania DEP joint permit application, a PennDOT highway occupancy permit, or any other permit under applicable state or federal regulations are regulated under Chapter
105 (Dam Safety and Water Management) or Chapter 106 (Floodplain Management) of Pennsylvania DEPs Rules and Regulations, or the proof of application for said permit(s) or approvals shall be part of the plan. The plan shall be coordinated with the state and federal permit process and the municipal SALDO review process.
A. For projects which require SALDO approval, the drainage plan shall
be submitted by the applicant as part of the preliminary plan submission
where applicable for the regulated activity.
B. For these regulated activities that do not require SALDO approval, see §
182-20, General requirements.
C. Six copies of the drainage plan shall be submitted and distributed
as follows:
(1) Two copies to the Township of Maidencreek accompanied by the requisite
municipal review fee, as specified in this chapter.
(2) Two copies to the Conservation District.
(3) One copy to the Municipal Engineer.
(4) One copy to the Berks County Planning Commission.
A disapproved drainage plan may be resubmitted, with the revisions addressing the Township of Maidencreek's concerns documented in writing and addressed to the Municipal Secretary in accordance with §
182-26 of this chapter and distributed accordingly and be subject to review as specified in §
182-27 of this chapter. The applicable municipal review and inspection fee must accompany a resubmission of a disapproved drainage plan.