A.
The SWM site plan shall consist of a narrative and all applicable
calculations, maps, plans and supplemental information necessary to
demonstrate compliance with this chapter.
B.
All landowners of land included in the SWM site plan shall be required
to execute all applications and final documents.
C.
All SWM site plans shall be prepared by a qualified person.
A.
The plan should be clearly and legibly drawn.
B.
If the plan is prepared in two or more drawing sheets, a key map
showing the location of the sheets and a match line shall be placed
on each sheet.
C.
Each sheet shall be numbered to show the relationship to the total
number of sheets in the plan (e.g., Sheet 1 of 5).
D.
Drawings or maps of the project area shall be drawn at one inch equals
fifty feet or larger scale (i.e., one inch equals forty feet, one
inch equals thirty feet, etc.) and shall be submitted on twenty-four-inch-by-thirty-six-inch
sheets.
E.
SWM site plans shall be prepared in a form that meets the requirements
for recording for the Office of the Recorder of Deeds of Lancaster
County.
F.
The total development site boundary and size with distances marked
to the nearest foot and bearings to the nearest degree.
The following items shall be included in the SWM site plan:
A.
The date of the SWM site plan and latest revision, graphic scale,
written scale and North arrow.
B.
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.
C.
The file or project number assigned by the firm that prepared the
plan.
D.
A statement, signed by the landowner, acknowledging the SWM facilities
to be permanent fixtures that cannot be altered or removed unless
a revised plan is approved by the Township.
E.
The following signature block for the Township:
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West Lampeter Township SWM Site Plan Approval Certification
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At a meeting on __________, 20_____, the West Lampeter Township
Board of Supervisors approved this project, and all conditions have
been met. This approval includes the complete set of plans and information
that are filed with the Township in File No. __________, based upon
its conformity with the standards of the West Lampeter Township Stormwater
Management Ordinance.
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Chairman
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Secretary
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F.
For SWM facilities located off-site.
G.
A note informing the owner that the Township shall have the right
of entry for the purposes of inspecting all stormwater conveyance,
treatment, or storage facilities.
H.
A location map, drawn to a scale of a minimum of one inch equals
2,000 feet, relating the plan to municipal boundaries, at least two
intersections of road centerline or other identifiable landmarks.
I.
Existing features.
(1)
In areas of disturbance, contours at intervals of one or two feet.
In areas of steep slopes (greater than 15%) and areas undisturbed,
five-foot contour intervals may be used.
(2)
The locations of all existing utilities (including on lot disposal
systems and wells), sanitary sewers, and water lines and associated
easements within 50 feet of property lines.
(3)
Physical features including flood hazard boundaries, wetlands, sinkholes,
streams, lakes, ponds and other waterbodies, existing drainage courses,
karst features, areas of native vegetation including trees greater
than six inches in diameter at breast height, woodlands, other environmentally
sensitive areas and the total extent of the upstream area draining
through the development site.
(4)
An overlay showing soil names and boundaries.
(5)
All existing man-made features within 200 feet of the development
site boundary.
(6)
Names of all owners of all immediately adjacent land, the names of
all proposed or existing developments immediately adjacent, and the
locations of dimension of any street or easements shown thereon.
J.
Proposed features.
(1)
Changes to the land surface and vegetative cover, including final
proposed contours at intervals of one or two feet in areas of disturbance.
In areas of steep slopes (greater than 15%) and areas undisturbed,
five-foot contour intervals may be used.
(2)
Proposed structures, roads, paved areas, buildings and other impervious
and semi-impervious areas.
(3)
The location of any proposed on-lot disposal systems, replacement
drainfield easements, and water supply wells.
(4)
A note indicating existing and proposed land use(s).
(5)
Plan and profile drawings of all proposed SWM facilities, including
BMPs, drainage structures, pipes, open channels, and swales.
(6)
Where pervious pavement is to be installed, pavement material and
construction specifications shall be included.
(7)
The location of all existing and proposed easements, including drainage
easements, access easements and riparian corridor easements.
(9)
The maximum impervious surface coverage for which the SWM facilities
have been designed for each lot on the SWM site plan.
K.
The location of all E&S control facilities.
L.
The plans
should clearly indicate the need for a preconstruction meeting to
be held prior to earth moving activities and recordation of the plan
and include personnel from the following:
[Added 9-12-2022 by Ord. No. 268]
(1)
West
Lampeter Township.
(2)
West
Lampeter Township Engineer.
(3)
The
Lancaster County Conservation District.
(4)
The
equitable owner.
(5)
The
consulting firm that prepared the plan.
(6)
Site
operator (entity with day-to-day control of the site).
(7)
The
excavator.
(8)
Anyone
else deemed necessary.
M.
A note
indicating that all items needing inspection shall be coordinated
by the owner and/or site operator (contractor). All requests for required
inspections by the contractor are to be deemed as approved requests
on behalf of the owner.
[Added 9-12-2022 by Ord. No. 268]
N.
The actual
existing and proposed lot coverage in square feet, in addition to
the percentages, should clearly be shown on the data provided on the
plan. This should correlate to the design information in the required
post-construction stormwater management report to be used as a benchmark
for all future impervious surface changes.
[Added 9-12-2022 by Ord. No. 268]
O.
When applicable,
notation should be added to the plan stating that "all impervious
surfaces to be removed are to be removed full depth, including any
stone base" so as to receive credit as a post-development condition
pervious surface in the stormwater management design. A statement,
signed by the owner and any successor, acknowledging that the impervious
surfaces to be removed full depth function as the SWM facilities for
this project and cannot be added back or altered or increased unless
a revised plan is approved by the Township must be provided.
[Added 9-12-2022 by Ord. No. 268]
P.
A note
indicating construction site operators are required to control waste
at the construction site that may cause adverse impacts to water quality.
These wastes can include discarded building materials, concrete washout,
chemicals, litter, and sanitary waste.
[Added 9-12-2022 by Ord. No. 268]
Q.
PCSM title blocks outlining each individual post-construction stormwater management BMP and/or facility in accordance with Appendix D.
[Added 9-12-2022 by Ord. No. 268]
A.
General description of the development site, including a description
of existing natural and hydrologic features and any environmentally
sensitive areas.
B.
General description of the overall SWM concept for the project, including
a description of permanent SWM techniques, nonstructural BMPs to be
employed and construction specifications of the materials to be used
for structural SWM facilities. The narrative shall include a description
of any treatment trains and how the facilities are meant to function
with each other to manage stormwater runoff.
C.
The effect of the project (in terms of runoff volumes, water quality
and peak flows) on adjacent properties and on any existing municipal
stormwater management facilities that may receive runoff from the
development site.
D.
Complete hydrologic, hydraulic, and structural computations for all
SWM facilities.
E.
Expected project time schedule.
F.
A statement signed by the landowner, acknowledging the stormwater
management system to be a permanent fixture that can be altered or
removed only after approved of a revised plan by the Township.
G.
When plan applications, whether preliminary or final, are submitted
in sections, a generalized stormwater management plan for the entire
development site shall be submitted in addition to the detailed stormwater
management site plan for the proposed section. This generalized plan
shall demonstrate how the stormwater of the proposed section will
relate to the entire development. The amount and velocity at the discharge
point of the section shall be included in the data submitted. If temporary
facilities are required for construction of a section, such facilities
shall be included in the submitted plans.
H.
A note on the plan indicated any area that is not to be offered for
dedication along with a statement that the Township is not responsible
for maintenance of any area not dedicated to and accepted for public
use, and that no alteration to swales, or basins, or placement of
structures shall be permitted within easements.
I.
For stormwater management facilities that would be located off site, a note on the plan referencing a recorded stormwater maintenance agreement which indicates that location and responsibility for maintenance of the off-site facilities. All off-site facilities shall meet the performance standards and design criteria specified in this chapter. See Appendix D, Maintenance Agreement,[1] for privately owned stormwater facilities, for maintenance
of on-site facilities.
[1]
Editor's Note: Said appendix is included as an attachment
to this chapter.
J.
Any other information deemed necessary or relevant by the Township
of the Township Engineer for the purposes of protecting the public
health, safety and welfare.
K.
Where
an NPDES construction permit is required, a general description of
the overall approach, techniques, controls, BMPs, and methods for
managing nonstormwater generating activities (including, but not limited
to concrete washouts and saw-cutting operations), waste (including,
but not limited to solid waste and sanitary/septic waste), materials
(including, but not limited to fertilizers/herbicides), and related
inspection and maintenance activities.
[Added 9-12-2022 by Ord. No. 268]
L.
Verification
of an approved and proven to be implemented agricultural erosion and
sediment control plan or conservation plan and a manure management
plan or nutrient management plan for agricultural uses.
[Added 9-12-2022 by Ord. No. 268]
A.
A written description of the following information shall be submitted:
(1)
The overall stormwater management concept for the project.
(2)
Calculations, assumptions, criteria and references used in the design
of stormwater management facilities, the establishment of capacities,
and the predevelopment and postdevelopment peak discharge.
(3)
For all basins, a plotting or tabulation of the storage volumes and
discharge curves with corresponding water surface elevations, inflow
hyrographs, and outflow hydrographs.
(4)
For all proposed detention and retention basins that hold two acre-feet
or more of water and have an embankment that is six feet or more in
height, solid structures and characteristics shall be proved. Plans
and data prepared by a registered professional experienced and educated
in soil mechanics shall be submitted. These submissions shall provide
design solutions for frost-heave potential, sping-swell potential,
soil-bearing strength, water infiltration, soil-settling characteristics,
fill and backfilling procedures and soil treatment techniques as required
to protect the improvements or structures.
(5)
Stormwater management techniques and BMPs to be applied both during
and after development.
(6)
Description of all erosion and sedimentation control measures, temporary
as well as permanent, including the staging of land-moving activities,
sufficient in detail to clearly indicate their function. All erosion
and sedimentation control measures shall conform to the requirements
of the PaDEP.
(7)
Expected project time schedule.
B.
A soil erosion and sedimentation control plan, including all reviews
and approvals, as required by PaDEP or the conservation district.
C.
In areas of carbonate geology, a detailed geologic evaluation prepared
by a registered professional geologist (PG) must be submitted as part
of the SWM site plan. The report shall include, but not limited to
the following:
D.
An E&S Plan, including all approvals, as required by 25 Pa. Code
Chapter 102, shall be provided to the Township prior to unconditional
final SWM site plan approval.
E.
For any activities that require a DEP joint permit application and
are regulated under Chapter 105 or Chapter 106, require a Penn DOT
highway occupancy permit, or require any other permit under applicable
state or federal regulations, the permit(s) shall be part of the SWM
site plan and must be obtained prior to unconditional final plan approval.
