[Ord. No. 1358, 9/12/2022]
For any of the activities regulated by this Part, 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 applicant
or his/her agent has received written approval of a drainage plan
from the municipality.
[Ord. No. 1358, 9/12/2022]
1.
Any regulated activity that meets the exception criteria in the following table is exempt from the provisions of this section. This criterion shall apply to the total development even if development is to take place in phases. The date of the municipal ordinance adoption 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 requirements in § 26-121, Subsections 3 and 4. Exemption shall not relieve the applicant from meeting the special requirements for watershed drainage to high quality (HQ) or exceptional value (EV) waters (§ 26-121) and requirements for groundwater recharge (§ 26-128), water quality (§ 26-129) and streambank erosion (§ 26-130), erosion and sedimentation control (§ 26-131), post-construction runoff control (§ 26-132), and prohibitions (Part 1H). Exemptions shall be at the discretion of the municipality, as recommended by the Municipal Engineer, upon review of site conditions, topography, soils, and other factors as desired appropriate.
A.
Exemptions regarding proposed impervious coverage shall be according
to the following table:
|
Stormwater Management Exemption Criteria
| |
|---|---|
|
Area Total Parcel Size
(square feet)
|
Impervious Exemption
|
|
< 1/4 acre
|
1,200 square feet
|
|
> 1/4 to 1 acre
|
2,500 square feet
|
|
> 1 acre
|
5,000 square feet
|
B.
In the case of earth disturbance only, earth disturbance activities
less than 5,000 square feet of disturbance are exempt from this section
of this Part.
C.
Road maintenance activities involving 25 acres or less earth disturbance
are exempt from this section of this Part.
[Ord. No. 1358, 9/12/2022]
1.
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 municipality 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.
(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 shall be prepared in a form that meets
the requirements for recording at the offices of the Recorder of Deeds
of Bucks County. 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 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
limits of earth disturbance and 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.
(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)
Location of all open channels.
(18)
Overland drainage paths.
(19)
A minimum fifteen-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 sedimentation control facilities.
(21)
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 Part.
(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,
which shall be recorded with the record plan and which shall be applicable
to all future landowners.
(23)
The following signature block for the design engineer:
(Design Engineer), on this date (date of signature), have reviewed
and hereby certify that the drainage plan meets all design standards
and criteria of the Delaware River South Watershed Act 167 Stormwater
Management Ordinance.
C.
Supplemental Information.
(1)
A written description of the following information shall be
submitted.
(b)
Stormwater runoff computations as specified in this Part.
(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 § 26-136
of this Part.
(2)
A soil erosion and sedimentation control plan, where applicable,
including all reviews and approvals, as required by DEP.
(3)
A geologic assessment of the effects of runoff on sinkholes
as specified in this Part.
(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.
[Ord. No. 1358, 9/12/2022]
1.
For all activities regulated by this Part, the steps below shall
be followed for submission. For any activities that require a DEP
joint permit application and regulated under 25 Pa. Code Chapter 105
(Dam Safety and Waterway Management) or 25 Pa. Code Chapter 106 (Floodplain
Management) of DEP'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.
[Ord. No. 1358, 9/12/2022]
1.
The Municipal Engineer shall review the drainage plan for consistency
with the adopted Delaware River South Watershed Act 167 Stormwater
Management Plan. The municipality shall require receipt of a complete
plan, as specified in this Part.
2.
The Municipal Engineer shall review the drainage plan for any subdivision
or land development against the municipal subdivision and land development
ordinance provisions not superseded by this Part.
3.
For activities regulated by this Part, the Municipal Engineer shall
notify the municipality in writing, whether the drainage plan is consistent
with the stormwater management plan. Should the drainage plan be determined
to be consistent with the stormwater management plan, the Municipal
Engineer will forward a review letter to the applicant with a copy
to the municipality.
4.
Should the drainage plan be determined to be inconsistent or noncompliant
with the stormwater management plan, the Municipal Engineer will forward
a letter to the applicant with a copy to the municipality citing the
reason(s) for the inconsistency or noncompliance. Any drainage plans
receiving this decision may be revised by the applicant and resubmitted
for reevaluation. The municipality will not grant approval to the
proposal until its drainage plan is deemed consistent with this Part.
5.
For regulated activities specified in § 26-104 of this Part, the Municipal Engineer shall notify the Municipal Building Permit Officer in writing, within a time frame consistent with the Municipal Building Code and/or Municipal Subdivision Ordinance, whether the drainage plan is consistent with the stormwater management plan and forward a copy of the approval/disapproval letter to the applicant. Any disapproved drainage plan may be revised by the applicant and resubmitted consistent with this Part.
6.
For regulated activities requiring a DEP joint permit application,
the Municipal Engineer shall notify DEP whether the drainage plan
is consistent with the stormwater management plan and forward a copy
of the review letter to the municipality and the applicant. DEP may
consider the Municipal Engineer's review comments in determining
whether to issue a permit.
7.
The municipality shall not approve any subdivision or land development for regulated activities specified in § 26-104 of this Part if the drainage plan has been found to be inconsistent with the stormwater management plan, as determined by the Municipal Engineer. All required permits from DEP must be obtained prior to approval of any subdivision or land development.
8.
The Municipal Building Permit Office shall not issue a building permit for any regulated activity specified in § 26-104 of this Part if the drainage plan has been found to be inconsistent with the stormwater management plan, as determined by the Municipal Engineer, or without considering the comments of the Municipal Engineer. All required permits from DEP must be obtained prior to issuance of a building permit.
9.
The applicant 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 Municipal Engineer
for final approval. In no case shall the municipality approve the
record drawings until the municipality receives a copy of an approved
declaration of adequacy, highway occupancy permit from the PennDOT
District Office, and any applicable permits from DEP.
10.
The municipality's approval of a drainage plan shall be valid for a period not to exceed four years. This four-year time period shall commence on the date that the municipality 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 four-year time period, then the municipality may consider the drainage plan disapproved and may revoke any and all permits. Drainage plans that are considered disapproved by the municipality shall be resubmitted in accordance with § 26-147 of this Part.
[Ord. No. 1358, 9/12/2022]
1.
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 Municipal Engineer, shall require a resubmission of the modified drainage plan consistent with § 26-144 of this Part and be subject to review as specified in § 26-145 of this Part.
2.
A modification to an already approved or disapproved drainage plan
shall be submitted to the municipality, accompanied by the applicable
fee. A modification to a drainage plan for which a formal action has
not been taken by the municipality shall be submitted to the municipality,
accompanied by the applicable municipality review fee.
[Ord. No. 1358, 9/12/2022]
A disapproved drainage plan may be resubmitted, with the revisions addressing the Municipal Engineer's concerns documented in writing addressed, to the municipality in accordance with § 26-144 of this Part and distributed accordingly and be subject to review as specified in § 26-145 of this Part. The applicable municipality review fee must accompany a resubmission of a disapproved drainage plan.
[Ord. No. 1358, 9/12/2022]
1.
The developer shall be responsible for completing an "as-built survey"
of all stormwater facilities included in the approved drainage plan.
The as-built survey and an explanation of any discrepancies with the
design plans shall be submitted to the municipality.
2.
The submission shall include a certification of completion from an
engineer, architect, surveyor or other qualified person verifying
that all permanent stormwater facilities have been constructed according
to the plans and specifications and approved revisions thereto.
3.
After receipt of the completion certification by the municipality,
the municipality may conduct a final inspection.
