Although not a requirement of this chapter, prior to proceeding
with SWM site plan preparation and submission, the applicant is encouraged
to request a preapplication meeting with the Borough, the Borough's
Engineer, and a staff member of the York County Conservation District
to discuss the plan concept and responsibility for submission of required
documents and information. The SWM site plan shall consist of all
applicable calculations, maps, and plans. The plan shall be sealed
by a professional engineer. The engineer shall certify that the plan
meets the minimum design requirements of this chapter. A note on the
plan shall refer to the associated computations and erosion and sedimentation
control plan shall refer to the associated SWM site plan sheets by
title and date. All SWM site plan materials shall be submitted to
the Borough in a format that is clear, concise, legible, neat and
well organized; otherwise, the SWM site plan will be disapproved and
returned to the applicant. Stormwater management facilities not located
within a public right-of-way shall be contained in and centered within
a drainage easement. Easements shall follow property boundaries where
feasible. A note shall be included on the stormwater management plan
indicating that nothing shall be placed, planted, set, or put within
the area of the easement. No alterations to swales, basins, BMPs,
or other stormwater management shall be permitted without written
permission by the Borough. The following items shall be included in
the SWM site plan:
A. Appropriate sections of the Borough's Subdivision and Land Development
Ordinance, and other applicable ordinances of the Borough regarding
subdivision and land development plan preparation and applicable plan
requirements shall be followed in preparing all SWM site plans, regardless
of whether or not an SWM site plan involves a subdivision and/or land
development plan.
B. The Borough shall not approve any SWM site plan that is deficient in meeting the requirements of this chapter. At its sole discretion, and in accordance with this article, when an SWM site plan is found to be deficient, the Borough may either disapprove the submission, or, in the case of minor deficiencies, the Borough may accept the submission of a revised SWM site plan as noted in §
173-404 of this chapter.
C. Provisions for permanent access or maintenance easements for all physical SWM BMPs, such as ponds and infiltration structures, as necessary to implement the operation and maintenance (O&M) plan discussed in Subsection
E(9) below.
D. The following signature block for the Borough:
"(Municipal official or designee), on this date (date of signature),
has reviewed and hereby certifies that the SWM site plan meets all
design standards and criteria of the Borough Ordinance No. (number
assigned to the Ordinance)."
E. If not required by the Borough Subdivision and Land Development Ordinance, as specified in §
173-401A of this chapter, the SWM site plan shall also provide the following information where applicable:
(1)
The overall stormwater management concept for the project, including
any additional information required for a postconstruction stormwater
management plan (PCSWMP) as applicable.
(2)
A determination of site conditions in accordance with the BMP
Manual. A detailed site evaluation shall be completed for projects
proposed in areas of carbonate geology or karst topography, as well
as for other environmentally sensitive areas, whether natural or man-made,
including floodplains, streams, lakes, ponds, hydric soils, wetlands,
brownfields and wellhead protection zones.
(3)
Stormwater runoff design computations, and documentation as specified in this chapter, or as otherwise necessary to demonstrate that the maximum practicable measures have been taken to meet the requirements of this chapter, including the recommendations and general requirements in §
173-301.
(4)
Expected project time schedule.
(5)
A soil erosion and sediment control plan, where applicable,
as prepared for, reviewed, and approved by the York County Conservation
District.
(6)
The effect of the project in terms of runoff volumes, water
quality, and peak discharges/flows on surrounding properties and aquatic
features, and on any existing stormwater conveyance system that may
be affected by the project.
(7)
Plan and profile drawings of all SWM BMPs, including drainage
structures, pipes, open channels, and swales.
(8)
The SWM site plan shall show the locations of existing and proposed
on-lot wastewater facilities and water supply wells.
(9)
The SWM site plan shall include an operation and maintenance
(O&M) plan for all existing and proposed physical stormwater management
facilities. This plan shall address long-term ownership and responsibilities
for O&M as well as schedules and costs for O&M activities.
(10)
A description of permanent stormwater management techniques,
including the construction specifications of the materials to be used
for stormwater management facilities.
(11)
A notarized signature of the owner of the parcel for which the
SWM site plan is proposed indicating that they are aware of, and will
be responsible for, operation and maintenance of the facilities. The
statement shall also acknowledge the stormwater management system
will be a permanent fixture that can be altered or removed only after
receipt of approval of a revised plan by the Borough.
(12)
Existing and proposed land uses.
(13)
The location of the proposed regulated activity relative to
streets, municipal boundaries, and other significant man-made features.
(14)
Significant physical features and associated boundary limits
including flood hazard areas, sinkholes, existing drainagecourses,
and areas of natural vegetation, and the total extent of the upstream
area draining through the site.
(15)
The location of existing and proposed utilities, stormwater
facilities, sanitary sewers, and waterlines on the parcel and within
50 feet of property lines.
(16)
Proposed changes to the land surface and vegetative cover, and
the type and amount of existing and proposed impervious area.
(17)
Existing and proposed structures, buildings, streets, driveways,
access drives, and parking areas.
(18)
Existing streams, lakes, ponds, or other bodies of water within
the project site.
(19)
An overlay showing soil names and boundaries.
(20)
Maximum impervious coverage for each lot based on lot coverages defined in the Zoning Ordinance, Chapter
224, for each zoning district.
(22)
The total tract boundary and size with distances marked to the
nearest foot and bearings to the nearest degree.
(23)
Soil evaluation to justify infiltration site location, location
of on-site testing, and results of on-site testing to establish infiltration
rates used for design.
(24)
Preferred existing and proposed contour intervals of two feet
in moderately sloped areas, and contours at intervals of five feet
for slopes in excess of 15%. Dependent upon site conditions, alternative
contour intervals proposed by an applicant or his designee may be
accepted by the Borough.
(25)
The name of the development, the name and address of the owner
of the property, and the name and address of the individual or firm
preparing the plan. Also to be included are the name, address, signature
and seal of any registered surveyor (attesting the accuracy of the
boundary survey), professional engineer, landscape architect, or professional
geologist (for geomorphological assessments) contributing to and/or
with a responsibility for any aspect of the plan where applicable.
(26)
Preferred graphic and written scale of one inch equals no more
than 50 feet. For parcels of 20 acres or more, the preferred scale
is one inch equals no more than 100 feet. Dependent upon site conditions,
an alternative scale proposed by the applicant or his designee may
be accepted by the Borough.
(28)
A map showing all existing man-made features beyond the subject
parcel's boundary lines that will be affected by the proposed regulated
activities.
(29)
Horizontal and vertical profiles of all open channels, including
hydraulic capacity.
(30)
A note on the plan indicating the location, and responsibility
for maintenance of SWM facilities and/or easements that would be located
on adjoining properties as a result of proposed regulated activities,
and the location of such facilities and/or easements.
(31)
A hydrogeologic assessment of the effects of stormwater runoff
on sinkholes where present.
(32)
The effect of the proposed regulated activity in terms of runoff
volumes and peak flows on adjacent properties and/or any existing
municipal stormwater collection system that may receive runoff from
the project site.
(34)
A location map, for the purpose of locating the project site
to be developed, at a minimum scale of 1,000 feet to the inch, showing
the relation of the tract to adjoining properties, and to all streets
and municipal boundaries existing within 400 feet of any part of the
tract of land on which the project site is proposed to be developed.
(35)
A summary table on the plan identifying all BMPs including BMP
ID, drainage area to the BMP, name of receiving water body, the BMP's
inspection and maintenance frequency, name of responsible person or
organization at the time of stormwater management plan approval and
the lot numbers where the BMP is located.
(36)
A planting plan is required for all vegetated stormwater BMPs.
(a)
Native or naturalized/noninvasive species suitable to the soil
and hydrologic conditions of the site shall be used unless otherwise
specified in the BMP Manual.
(b)
Invasive vegetation may not be included in any planting schedule.
(c)
The limit of existing, native vegetation to remain shall be
delineated on the plan along with proposed construction protection
measures.
F. Stormwater management facilities.
(1)
All stormwater management facilities must be located on a plan
and described in detail, including:
(a)
Other control devices or methods including rooftop storage,
semipervious paving materials, grass swales, parking lot ponding,
vegetated strips, detention or retention ponds, storm sewers, etc.
(b)
Basins. A cross section of the basin showing the relationship
between the existing topography and the proposed bottom, spillway,
top of embankment, and the outlet structure and the corresponding
proposed finished grade elevations. A detail of the outlet structure
shall be provided, including all pertinent construction requirements.
(c)
Schedule for installation of the control measures and devices.
In all cases, the proposed stormwater control devices must be completed
prior to the creation of additional impervious area. Where stormwater
management basins are used as sediment control facilities during construction,
the conversion to the stormwater management facility shall occur within
six months of stabilization of the site.
(2)
When groundwater recharge methods such as seepage pits, beds,
or trenches are used, a detailed cross section must be included, showing
the locations of existing and proposed septic tank infiltration areas
and wells.
(a)
All piping used for seepage pits, beds or trenches shall be
specified in the details, from the downspout drops to the infiltration
site.
(b)
A detail shall be shown for overflow devices at all connection
points to downspouts. Overflow devices shall be directly away from
the structure's wall a minimum of five feet.
(3)
All calculations, assumptions, and criteria used in the design
of the control device or method must be submitted with the plan, including,
but not limited to: a) methodology for determining time of concentration
and weighted runoff curve numbers; b) stage/storage/discharge table
including sample calculations for determining discharge rates; c)
summary table showing predevelopment, controlled and uncontrolled
postdevelopment peak discharge rates for all required storms; and
d) copies of infiltration test results when required.
(4)
Discharge from uncontrolled impervious surfaces shall be no
closer to a property line than one foot for every 25 square feet of
impervious surface (measured along a vegetated flow path). The minimum
distance is three feet.
G. Stormwater collection system.
(1)
All catch basins, pipes, swales, and other means of conveyance
of stormwater must be shown and described, including:
(a)
A plan view of the collection system showing the location, size,
and material for all catch basins, ditches, swales, and pipes.
(b)
A profile of the collection system showing existing and proposed
finish grades, proposed invert elevations and slope of each storm
sewer or open channel segment.
(c)
A topographic plan showing the area tributary to each design
point in the collection system must be submitted with the plans.
A revision to a previously submitted SWM site plan that involves
a change in SWM BMPs, stormwater management facilities, or changes
in analytical techniques, or that involves the relocation or redesign
of SWM BMPs, or that is necessary because soil or other conditions
are not as stated on the SWM site plan, as determined by the Borough,
shall require a resubmission of the revised SWM site plan in accordance
with this article, including applicable fees. For NPDES permitted
sites, any revised SWM site plan shall also be resubmitted to the
York County Conservation District for review. In the case of an SWM
site plan which contains minor deficiencies, such as a missing label,
omission of a required note or minor construction detail, as determined
by the Borough, the Borough may accept a resubmission of such SWM
site plan without the requirement of a review fee, or for a lesser
fee as provided for in the Borough's fee schedule.
A disapproved SWM site plan may be resubmitted, with the revisions addressing the Borough's concerns as stated regarding the original submission, to the Borough in accordance with this article. The applicable review fee must accompany the submission of a revised SWM site plan, unless such fee is waived by the Borough. (See §
173-404.)