[Ord. No. 1528, 9-26-2022]
(a) All regulated earth disturbance activities shall be subject to permit
requirements by DEP under regulations at 25 Pa. Code Chapter 102.
(b) Work within natural drainageways, or waterways of the commonwealth, shall be subject to permit by DEP under 25 Pa. Code Chapter
105 and U.S. Army Corps of Engineers 401 and 404 permitting.
(c) Any stormwater management facility that would be located in or adjacent to surface waters of the commonwealth, including wetlands, shall be subject to permit by DEP under 25 Pa. Code Chapter
105.
(d) Any stormwater management facility that would be located on a state
highway right-of-way, or require access from a state highway, shall
be subject to approval by the Pennsylvania Department of Transportation
(PennDOT).
(e) Culverts, bridges, storm sewers or any other facilities which must pass or convey flows from the tributary area and any facility which may constitute a dam shall be subject to permit by DEP under 25 Pa. Code Chapter
105.
[Ord. No. 1528, 9-26-2022]
(a) No regulated earth disturbance activities within the Town shall commence
until the Town receives a copy of any required approvals from the
Conservation District or DEP for an erosion and sediment control plan.
(b) The PADEP has regulations that require an erosion and sediment control
plan for any earth disturbance activity of 5,000 square feet or more
under 25 Pa. Code § 102.4(b).
(c) In addition, under 25 Pa. Code Chapter 92, a DEP NPDES construction
activities permit is required for regulated earth disturbance activities.
(d) Evidence of any necessary permit(s) for regulated earth disturbance
activities from the appropriate DEP regional office or County Conservation
District must be provided to the Town.
(e) A copy of the erosion and sediment control plan and any required
permits, as required by DEP regulations, shall be available at the
project site at all times.
(f) Additional erosion and sediment control design standards and criteria
are recommended to be applied where infiltration BMPs are proposed
and shall include the following:
(1)
Areas proposed for infiltration BMPs shall be protected from
sedimentation and compaction during the construction phase to maintain
maximum infiltration capacity.
(2)
Infiltration BMPs shall not be constructed nor receive runoff
until the entire contributory drainage area to the infiltration BMP
has achieved final stabilization.
[Ord. No. 1528, 9-26-2022]
(a) No person in the Town shall allow, or cause to allow, stormwater
discharges into the Town's separate storm sewer system and/or
waters of this commonwealth which are not composed entirely of stormwater,
except:
(1)
As provided in Subsection (b) below; and
(2)
Discharges allowed under a state or federal permit.
(b) The following discharges are authorized unless they are determined
to be significant contributors to pollution to the waters of this
commonwealth:
(1)
Discharges from firefighting activities.
(2)
Potable water sources, including dechlorinated water line and
fire hydrant flushings.
(4)
Routine external building washdown (which does not use detergents
or other compounds).
(5)
Air-conditioning condensate.
(6)
Water from individual residential car washing.
(7)
Springwater from crawl space pumps.
(8)
Uncontaminated water from foundation or from footing drains.
(9)
Flows from riparian habitats and wetlands.
(11)
Pavement wash waters where spills or leaks of toxic or hazardous
materials have not occurred (unless all spill material has been removed)
and where detergents are not used.
(12)
Dechlorinated swimming pool discharges.
(13)
Uncontaminated groundwater.
(c) In the event that the Town determines that any of the discharges identified in §
913.12(b) significantly contribute to pollution of waters of the commonwealth, or is so notified by DEP, the Town or PADEP will notify the responsible person to cease the discharge.
(d) Nothing in this section shall affect a discharger's responsibilities
under state law.
(e) All chemically treated swimming pool discharges, such as backwash
water, etc., are not permitted to be discharged into the Town's
separate storm sewer system.
(f) A direct connection of a swimming pool discharge line to the Town's
separate storm sewer system is prohibited.
(g) It is strongly encouraged that all swimming pool discharge water
be conveyed into the sanitary sewer system. In situations where swimming
pool discharge water which meets the state water quality requirements
as identified under 25 Pa. Code Chapter 93, is proposed to drain to
the Town's separate storm sewer system, the following protocol
must be used:
(1)
The owner of the swimming pool must provide to the Town a hold
harmless agreement which shall release the Town from any liability
in the event that the swimming pool discharge results in degradation
of the watercourse into which the pool water is discharged.
(2)
A laboratory analysis must be provided to the Town prior to
authorizing a discharge of the pool waters to the Town's separate
storm sewer system. The analysis must be performed by a certified
and bonded laboratory in the Commonwealth of Pennsylvania independent
from the pool operator. The analysis must document that the pool water
meets the state water quality requirements as identified under 25
Pa. Code Chapter 93, at the time of the discharge.
(3)
The owner of the swimming pool shall provide in the hold harmless
agreement that the owner will pay any fines levied against the Town
and expenses incurred by the Town in the event that the swimming pool
discharge is discovered to have negatively impacted a waterway of
the commonwealth, the receipt of a certified laboratory analysis by
the Town notwithstanding.
(h) Existing roof drain, underdrain, and sump pump discharges should
be directed to a lawn area or other pervious areas. However, this
discharge should not be directed toward structures on adjacent properties.
If required by the Town, the discharge shall be directed to a stone
sump or infiltration BMP. If approved by the Town, the discharge may
also be directly connected to the storm sewer system.
(i) If a direct connection of roof drains or stormwater runoff is permitted
by the Town, the storm lateral shall be constructed in accordance
with the Town of McCandless Standard Design Criteria for Stormwater
Management and Soil Erosion and Sedimentation Control (latest edition).
A cleanout shall be constructed near the right-of-way line (approximately
10 feet from the edge of pavement) for municipal inspection purposes.
The Town reserves the right to access and inspect the stormwater inspection
port as deemed necessary for MS4 compliance documentation.
(j) Any private storm sewer must be equipped with BMPs to address runoff
quality if the development plan is not equipped with a regional stormwater
management facility containing BMPs. BMP measures shall be privately
owned and maintained and must be implemented on the system on private
property prior to the inspection port.
(k) The applicant must demonstrate that the stormwater discharge meets state water quality requirements in accordance with §
913.16 and 25 Pa. Code Chapter 93.
(l) No person shall construct private facilities for stormwater management
purposes within the public right-of-way.
(m) If a storm lateral connection is proposed to traverse a property
other than that which it serves, a private easement agreement must
be recorded with Allegheny County. A copy of this agreement must be
provided to the Town prior to the issuance of a permit.
[Ord. No. 1528, 9-26-2022]
(a) For all regulated activities not eligible for exemptions pursuant to §
913.06 of this article, the applicant shall submit a stormwater management plan and report prepared by a professional engineer, licensed in the Commonwealth of Pennsylvania, which shall contain, but not be limited to, the following: (Final copies of all plans, specifications and reports shall also be submitted to the Town in an electronic format, preferably Adobe
®.pdf format.)
(1)
A suitable map of the watershed for any and all named streams
within which the project is proposed (a United States Geological Survey
quadrangle map is usually sufficient) with existing and proposed development
areas presented on the map. The site must also be shown on a watershed
key map indicating the location of the site within the applicable
watersheds. See Appendix A.
(2)
Suitable maps and drawings showing all existing natural and
constructed drainage facilities affecting the subject property.
(3)
Hydrologic (watershed) and water feature boundaries, including
all areas flowing to the proposed project, existing streams (including
first-order and intermittent streams), springs, lakes, ponds, or other
bodies of water within the project area.
(4)
Sufficient topographical information with elevations to verify
the location of all ridges, streams, etc. (two-foot contour intervals
within the project's boundaries and for proposed off-site improvements;
for slopes greater than 15%, five-foot contours are acceptable).
(5)
Notes pertaining to, and locations of, existing standing water,
areas of heavy seepage, springs, wetlands, streams, and hydrologically
sensitive areas. The water quality standards use designation prescribed
by 25 Pa. Code Chapter 93 must also be provided on the plan.
(6)
General type of soils within the drainage areas with hydrologic
soil groups noted. The estimated permeability in inches per hour,
and location and results of all soil tests and borings (if needed),
should also be shown on the plan.
(7)
One-percent-annual-chance flood (100-year flood) elevations
for any special flood hazard areas on or within 100 feet of the property.
For redevelopment sites, also show the ten-percent-annual-chance flood
(ten-year flood) and two-percent-annual-chance flood (fifty-year flood)
elevations for any special flood hazard areas on or within 100 feet
of the property. The source of these elevations shall also be shown
on the plans.
(8)
Description of current and proposed ground cover and land use.
The total area and percent of impervious cover shall be noted. Current
ground cover and land use should be based on the latest aerial photography
of the area.
(9)
A wetland delineation report for the project site with a location
map identifying wetland areas if any were found.
(10)
A plan of the proposed stormwater drainage system attributable
to the activity proposed, including runoff calculations, stormwater
management practices to be applied both during and after development,
and the expected project time schedule.
(11)
The design computations for all proposed stormwater drainage
systems, including storm-drain pipes, inlets, runoff control measures
and culverts, drainage channels, and other features, facilities, and
stormwater management practices.
(12)
A grading plan, including all areas of disturbance of the subject
activity. The total area of disturbance shall be noted in square feet
and acres. Topographic contours showing the existing and proposed
final contours at an interval of two feet; in areas having slope of
greater than 15%, a five-foot contour interval may be used.
(13)
A plan of the erosion and sedimentation procedures to be utilized
as required by Town ordinance and state regulations.
(14)
The effect of the project (in terms of runoff volumes and peak
flows) on adjacent properties and on any other stormwater collection
system that may receive runoff from the project site and specifics
of how erosion and flooding impacts to adjacent properties will be
avoided or otherwise mitigated.
(15)
A plan showing the proposed grading and projected house locations
to assure that upslope runoff will not be directed toward new or existing
homes. Drainage paths and slopes should be shown on this plan to clearly
convey the intent of the grading plan.
(16)
An operation and maintenance plan consistent with the requirements of §
913.19. Such a plan should clearly explain how the proposed facilities operate and the functions they serve.
(17)
The name of the development, the name and address of the property
owner and applicant, and the name and address of the individual or
firm preparing the plan.
(18)
A North arrow, submission date, graphic scale, and revision
dates as applicable shall be included on each page of all plans submitted.
(19)
Complete delineation of the flow paths used for calculating
the time of concentration for the predeveloped and post-developed
conditions.
(20)
Construction details sufficient to completely express the intended
stormwater design components consistent with this article.
(21)
Floodplain boundaries for the one-percent-annual-chance flood
(100-year flood) frequency storm are to be shown for all waterways
with a drainage area of 150 acres or greater.
(22)
A listing of all permits required for the site, providing the
status of the permit application(s) and approval(s).
(23)
A signature block on the site plan must be provided for municipal
approval.
(24)
The approved stormwater management site plan must be on-site
throughout construction.
(25)
A justification must be included if best management practices
(BMPs) other than green infrastructure and low-impact development
(LID) practices are being used to achieve volume, rate, and water
quality controls.
(b) All adjacent property owners shall be notified of the project and
its stormwater and BMP installation. Legal proof of this notification
must be provided to the municipality.