[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.
(3) 
Irrigation drainage.
(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.
(10) 
Lawn watering.
(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.
(14) 
Rising groundwaters.
(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.[1]
[1]
Editor's Note: Appendix A is included as an attachment to this article.
(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.