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 Borough and
an adequate erosion and sediment control plan review by the Conservation District.
A.
The drainage plan shall consist of a general description of the project, including sequencing items described in § 276-19, 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 Borough 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.
B.
The following items shall be included in the drainage
plan:
(1)
General.
(b)
General description of proposed permanent stormwater
management techniques, including construction specifications of the materials
to be used for stormwater management facilities.
(c)
Complete hydrologic, hydraulic, and structural computations
for all stormwater management facilities.
(d)
An erosion and sediment control plan, including all reviews
and letters of adequacy from the Conservation District.
(e)
A general description of proposed nonpoint source pollution
controls.
(f)
The drainage plan application and completed fee schedule form and associated fee (Ordinance Appendix C-1).[1]
[1]
Editor's Note: Appendix C-1 is included at the end of this chapter.
(g)
The Drainage Plan Checklist (Appendix C-2).[2]
[2]
Editor's Note: Appendix C-2 is included at the end of this chapter.
(2)
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 Montgomery County. If the SALDO has more stringent criteria than
this chapter, then the more stringent criteria shall apply. The contents of
the map(s) shall include, but not be limited to:
(a)
The location of the project relative to highways, Borough
boundaries, or other identifiable landmarks.
(b)
Existing contours at intervals of two feet.
(c)
Existing streams, lakes, ponds, or other waters of the
commonwealth within the project area.
(d)
Other physical features, including flood hazard boundaries,
stream buffers, existing drainagecourses, areas of natural vegetation to be
preserved, and the total extent of the upstream area draining through the
site.
(e)
The locations of all existing and proposed utilities,
sanitary sewers, and water lines within 50 feet of property lines.
(f)
An overlay showing soil names and boundaries.
(g)
Limits of earth disturbance, including the type and amount
of impervious area that would be added.
(h)
Proposed structures, roads, paved areas, and buildings.
(i)
Final contours at intervals of two feet.
(j)
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.
(k)
The date of submission.
(l)
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.
(m)
A North arrow.
(n)
The total tract boundary and size with distances marked
to the nearest foot and bearings to the nearest degree.
(o)
Existing and proposed land use(s).
(p)
A key map showing all existing man-made features beyond
the property boundary that would be affected by the project.
(q)
Location of all open channels.
(r)
Overland drainage patterns and swales.
(s)
A fifteen-foot-wide access easement around all stormwater
management facilities that would provide ingress to and egress from a public
right-of-way.
(t)
The location of all erosion and sediment control facilities.
(u)
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.
(v)
A statement, signed by the applicant, acknowledging that
any revision to the approved drainage plan must be approved by the Borough,
and that a revised erosion and sediment control plan must be submitted to
the Conservation District for a determination of adequacy.
(w)
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 Chapter 276, of the Borough of Norristown Stormwater Management Ordinance."
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(x)
Items required by the Norristown Borough Subdivision
and Land Development Regulations.
(3)
Supplemental information to be submitted to the Borough.
(a)
A written description of the following information shall
be submitted by the applicant and shall include:
[2]
Stormwater runoff computations as specified in this chapter.
[3]
Stormwater management techniques to be applied both during
and after development.
[4]
Expected project time schedule.
[5]
Development stages or project phases, if so proposed.
If the project is to be developed in stages, the entire project drainage plan
shall be presented with the first stage, and appropriate stages for the drainage
system shall be indicated, in accordance with Pennsylvania DEP rules and regulations.
(b)
An erosion and sediment control plan.
(c)
A description of the effect of the project (in terms
of runoff volumes and peak flows) on adjacent properties and on any existing
Borough stormwater collection system that may receive runoff from the project
site.
(d)
A declaration of adequacy and highway occupancy permit
from the Pennsylvania Department of Transportation (PennDOT) District office
when utilization of a PennDOT storm drainage system is proposed.
(4)
Stormwater management facilities.
(a)
All stormwater management facilities must be located
on a plan and described in detail.
(b)
When infiltration measures such as seepage pits, beds,
or trenches are used, the locations of existing and proposed septic tank infiltration
areas and wells must be shown.
(c)
All calculations, assumptions, and criteria used in the
design of the stormwater management facilities must be shown.
The Borough shall require receipt of a complete drainage plan, as specified
in this chapter.
A.
Proof of application or documentation of required permit(s)
or approvals for the programs listed below shall be part of the plan:
(1)
NPDES permit for stormwater discharges from construction
activities.
(2)
DEP joint permit application.
(3)
PennDOT highway occupancy permit.
(4)
Chapter 105 (Dam Safety and Waterway Management).
(5)
Chapter 106 (Floodplain Management).
(6)
Any other permit under applicable state or federal regulations.
C.
For projects that 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.
E.
Six copies of the drainage plan shall be submitted and
distributed as follows:
F.
Any submissions to the agencies listed above that are
found to be incomplete shall not be accepted for review and shall be returned
to the applicant with a notification in writing of the specific manner in
which the submission is incomplete.
A.
The Borough Engineer shall review the drainage plan for
consistency with this chapter and the respective Act 167 stormwater management
plan. Any found incomplete shall not be accepted for review and shall be returned
to the applicant.
B.
The Borough Engineer shall review the drainage plan for
any subdivision or land development against the Borough SALDO provisions not
otherwise superseded by this chapter.
C.
The Conservation District, in accordance with established
criteria and procedures, shall review the drainage plan for consistency with
stormwater management and erosion and sediment pollution control requirements
and provide comments to the Borough. Such comments shall be considered by
the Borough prior to final approval of the drainage plan.
D.
For activities regulated by this chapter, the Borough
Engineer shall notify the applicant and the Borough in writing, within 15
calendar days, whether the drainage plan is consistent with the stormwater
management plan.
(1)
If the Borough Engineer determines that the drainage
plan is consistent with the stormwater management plan, the Borough Engineer
shall forward a letter of consistency to the Borough Secretary who will then
forward a copy to the applicant.
(2)
If the Borough Engineer determines that the drainage
plan is inconsistent or noncompliant with the stormwater management plan,
the Borough Engineer shall forward a letter to the Borough Secretary with
a copy to the applicant citing the reason(s) and specific Ordinance sections
for the inconsistency or noncompliance. Inconsistency or noncompliance may
be due to inadequate information to make a reasonable judgment as to compliance
with the stormwater management plan. Any drainage plans that are inconsistent
or noncompliant may be revised by the applicant and resubmitted when consistent
with this chapter. The Borough Secretary shall then notify the applicant of
the Borough Engineer's findings. Any inconsistent or noncompliant drainage
plans may be revised by the applicant and resubmitted consistent with this
chapter.
E.
For regulated activities specified in § 276-5 of this chapter that require a building permit, 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 SALDO, whether the drainage plan is consistent with the stormwater management plan. The Borough Building Permit Officer shall forward a copy of the consistency/inconsistency letter to the applicant. Any drainage plan deemed inconsistent may be revised by the applicant and resubmitted consistent with this chapter.
F.
For regulated activities under this chapter that require
an NPDES permit application, the applicant shall forward a copy of the Borough
Engineer's letter stating that the drainage plan is consistent with the
stormwater management plan to the Conservation District. DEP and the Conservation
District may consider the Borough Engineer's review comments in determining
whether to issue a permit.
G.
The Borough shall not grant preliminary or final approval to any subdivision or land development for regulated activities specified in § 276-5 of this chapter if the drainage plan has been found by the Borough Engineer to be inconsistent with the stormwater management plan. All required permits from DEP must be obtained prior to approval of any subdivision or land development.
H.
No building permits for any regulated activity specified in § 276-5 of this chapter shall be approved by the Borough if the drainage plan has been found to be inconsistent with the stormwater management plan, as determined by the Borough Engineer and Conservation District, or without considering the comments of the Borough Engineer and Conservation District. All required permits from DEP must be obtained prior to issuance of a building permit.
I.
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 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 and/or highway
occupancy permit from the PennDOT District office, NPDES permit, and any other
applicable permits or approvals from DEP or the Conservation District. The
above permits and approvals must be based on the record drawings.
J.
The Borough's approval of a drainage plan shall be valid for a period not to exceed two years commencing 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, record drawings of these facilities have not been approved within this two-year time period, then the Borough may consider the drainage plan inconsistent or noncompliant and may revoke any and all permits. Drainage plans that are determined to be inconsistent or noncompliant by the Borough shall be resubmitted in accordance with § 276-15 of this chapter.
A.
A modification to a submitted drainage plan under review by the Borough for a development site that involves the following shall require a resubmission to the Borough of a modified drainage plan consistent with § 276-12 of this chapter and be subject to review as specified in § 276-13 of this chapter:
B.
A modification to an already approved or inconsistent
or noncompliant drainage plan shall be submitted to the Borough, accompanied
by the applicable Borough review and inspection fee. 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 and
inspection fee.
An inconsistent or noncompliant drainage plan may be resubmitted with the revisions addressing the Borough Engineer's concerns documented in writing. It must be addressed to the Borough Secretary in accordance with § 276-12 of this chapter, distributed accordingly, and be subject to review as specified in § 276-13 of this chapter. The applicable Borough review and inspection fee must accompany a resubmission of an inconsistent or noncompliant drainage plan.