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 land disturbance activity may not proceed
until the property owner or developer or his/her agent has received
written approval of a drainage plan from the Borough.
[Amended 7-14-2014 by Ord. No. 2014-04]
Regulated activities performed by the Borough of Chambersburg are exempt from the provisions of this chapter. In addition, sidewalks within the public street right-of-way are exempt from the provisions of this chapter. Finally, any regulated activity that meets the exception criteria in the following table is exempt from the provisions of this chapter. This criteria shall apply to the total development even if development is to take place in phases. The date of the adoption of this chapter shall be the starting point from which to consider tracts as "parent tracts" in which future subdivisions and respective impervious area computations shall be cumulatively considered. An exemption shall not relieve the applicant from implementing such measures as are necessary to protect health, safety and property. This exemption shall not relieve the applicant from meeting the special requirements for watersheds draining to high-quality (HQ) or exceptional value (EV) waters (§ 251-11K) and requirements for groundwater recharge (§ 251-17), water quality (§ 251-18) and streambank erosion (§ 251-19). An exemption shall not relieve the applicant from providing adequate stormwater management to meet the purpose of this chapter; however, drainage plans will not have to be submitted to the Borough.
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Stormwater Management Exemption Criteria
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Total Parcel Size
(acres)
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Impervious Area Exemption
(square feet)
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Less than or equal to 1/4
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2,500
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More than 1/4 to 1
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5,000
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More than 1 to 2
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10,000
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More than 2 to 5
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15,000
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More than 5
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20,000
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The drainage plan shall consist of all applicable
calculations, maps and plans. A note on the maps shall refer to the
associated computations and erosion and sedimentation control plan
by title and date. The cover sheet of the computations and erosion
and sedimentation control plan shall refer to the associated maps
by title and date. All drainage plan materials shall be submitted
to the Borough in a format that is clear, concise, legible, neat and
well organized; otherwise, the drainage plan shall be disapproved
and returned to the applicant. The following items shall be included
in the drainage plan:
A.
General.
(1)
General description of project.
(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.
B.
Map(s) of the project area shall be submitted on eighteen-inch-by-twenty-four-inch
sheets or twenty-four-inch-by-thirty-six-inch sheets and shall be
prepared in a form that meets the requirements for recording at the
offices of the Recorder of Deeds of Franklin County. The contents
of the maps(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-feet contour intervals may
be used.
(3)
Existing streams, lakes, ponds or other bodies of
water within the project area.
(4)
Other physical features including flood hazard boundaries,
sinkholes, streams, 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)
Proposed changes to the land surface and vegetative
cover, 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-feet 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.
(11)
The date of submission.
(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.
(13)
A North arrow.
(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)
Horizontal and vertical profiles of all open
channels, including hydraulic capacity.
(18)
Overland drainage paths.
(19)
A fifteen-foot-wide access easement around all
stormwater management facilities that would provide ingress to and
egress from a public right-of-way.
(20)
A note on the plan indicating the location and
responsibility for maintenance of stormwater management facilities
that would be located off site. All off-site facilities shall meet
the performance standards and design criteria specified in this chapter.
(21)
A construction detail of any improvements made
to sinkholes and the location of all notes to be posted, as specified
in this chapter.
(22)
A statement, signed by the landowner, acknowledging
the stormwater management system to be a permanent fixture that can
be altered or removed only after approval of a revised plan by the
municipality.
(23)
The following signature block for the design
engineer:
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"(Design Engineer), on this date (date of signature),
hereby certifies that the drainage plan meets all design standards
and criteria of the Borough of Chambersburg Stormwater Management
Ordinance as well as the Conococheague Creek Watershed Act 167 Stormwater
Management Ordinance."
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(24)
The location of all erosion and sedimentation
control facilities.
C.
Supplemental information.
(1)
A written description of the following information
shall be submitted.
(2)
A soil erosion and sedimentation control plan, where
applicable, including all reviews and approvals, as required by PaDEP.
(3)
A geologic assessment of the effects of runoff on
sinkholes as specified in this chapter.
(4)
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.
(5)
A declaration of adequacy and highway occupancy permit
from the PENNDOT District Office when utilization of a PENNDOT storm
drainage system is proposed.
D.
Stormwater management facilities.
(1)
All stormwater management facilities must be located
on a plan and described in detail.
(2)
When groundwater recharge methods 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.
For all activities regulated by this chapter,
the steps below shall be followed for submission. For any activities
that require a PaDEP joint permit application and regulated under
Chapter 105 (Dam Safety and Waterway Management) or Chapter 106 (Floodplain
Management) of PaDEP's Rules and Regulations, require a PENNDOT highway
occupancy permit or require any other permit under applicable state
or federal regulations, the proof of application for that, the permit(s)
shall be part of the plan. The plan shall be coordinated with the
state and federal permit process.
A.
The Borough Engineer shall review the drainage plan
for consistency with the adopted Conococheague Creek Watersheds Act
167 Stormwater Management Plan. The Borough shall require receipt
of a complete plan, as specified in this chapter.
B.
The Borough Engineer shall review the drainage plan
for any submission or land development against the Borough subdivision
and land development ordinance provisions not superseded by this chapter.
C.
Should the drainage plan be determined to be consistent
with the stormwater management plan, the Borough Engineer will then
notify the developer.
D.
Should the drainage plan be determined to be inconsistent
with the stormwater management plan, the Borough Engineer will notify
the developer. Any disapproved drainage plans may be revised by the
developer and resubmitted consistent with this chapter.
E.
For regulated activities specified in § 251-4 of this chapter, the Borough Engineer shall notify the Borough building permit officer in writing, within a time frame consistent with the Borough Building Code and/or Borough Subdivision and Land Development Ordinance,[1] whether the drainage plan is consistent with the stormwater
management plan and will provide a copy of the approval/disapproval
letter to the developer. Any disapproved drainage plan may be revised
by the developer and resubmitted consistent with this chapter.
F.
For regulated activities requiring a PaDEP joint permit
application, the Borough Engineer shall notify PaDEP whether the drainage
plan is consistent with the stormwater management plan and forward
a copy of the review letter to the developer.
G.
The Borough shall not approve any subdivision or land development for regulated activities specified in § 251-4 of this chapter if the drainage plan has been found to be inconsistent with the stormwater management plan, as determined by the Borough Engineer. All required permits from PaDEP must be obtained prior to approval of any subdivision of land development.
H.
The Borough building permit office shall not issue a building permit for any regulated activity specified in § 251-4 of this chapter if the drainage plan has been found to be inconsistent with the stormwater management plan, as determined by the Borough Engineer, or without considering the comments of the Borough Engineer. All required permits from PaDEP must be obtained prior to issuance of a building permit.
I.
The developer shall be responsible for completing
record drawings of all stormwater management facilities included in
the approved drainage plan. The record drawings and an explanation
of any discrepancies with the design plans shall be submitted to the
Borough Engineer for final approval. In no case shall the Borough
approve the record drawings until the Borough receives a copy of an
approved declaration of adequacy, highway occupancy permit from the
PENNDOT District Office and any applicable permits from PaDEP.
J.
The Borough's approval of a drainage plan shall be valid for a period not to exceed five years. This five-year time period shall commence on the date that the Borough signs the approved drainage plan. If stormwater management facilities included in the approved drainage plan have not been constructed, or if constructed, and record drawings of these facilities have not been approved within this five-year time period, then the Borough may consider the drainage plan disapproved and may revoke any and all permits. Drainage plans that are considered disapproved by the Borough shall be resubmitted in accordance with § 251-25 of this chapter.
A.
A modification to a submitted drainage plan for a development site that involves a change in stormwater management facilities or techniques, or that involves the relocation or redesign of stormwater management facilities or that is necessary because soil or other conditions are not as stated on the drainage plan as determined by the Borough Engineer shall require a resubmission of the modified drainage plan consistent with § 251-22 of this chapter and be subject to review as specified in § 251-23 of this chapter.
B.
A modification to an already approved or disapproved
drainage plan shall be submitted to the Borough, accompanied by the
applicable review. A modification to a drainage plan for which a formal
action has not been taken by the Borough shall be submitted to the
Borough, accompanied by the applicable Borough review fee.
A disapproved drainage plan may be resubmitted, with the revisions addressing the Borough Engineer's concerns documented in writing addressed, to the Borough Engineer in accordance with § 251-22 of this chapter and distributed accordingly and be subject to review as specified in § 251-23 of this chapter. The applicable Borough review fee must accompany a resubmission of a disapproved drainage plan.
