1. For all regulated activities, unless preparation of an SWM Site Plan is specifically exempted in § 26-122.
A. Preparation and implementation of an approved SWM Site Plan is required.
B. No regulated activities shall commence until the Borough issues written approval of an SWM Site Plan, which demonstrates compliance with the requirements of this Part.
2. SWM Site Plans approved by the Borough, in accordance with § 26-136, shah be on site throughout the duration of the regulated activity.
3. These standards apply to the landowner and any person engaged in regulated activities.
4. For ah regulated earth disturbance activities, erosion and sediment control BMPs shall be designed, implemented, operated, and maintained during the regulated earth disturbance activities (e.g., during construction) to meet the purposes and requirements of this Ordinance and to meet all requirements under Title 25 of the Pennsylvania Code and the Clean Streams Law. Various BMPs and their design standards are listed in the Erosion and Sediment Pollution Control Program Manual (E&S Manual!), No. 363-2134-008, as amended and updated.
5. Impervious areas:
A. The measurement of impervious areas shah include all of the impervious areas in the total proposed development even if development is to take place in stages.
B. For development taking place in stages, the entire development plan must be used in determining conformance with this Part.
C. Forprojects that add impervious area to a parcel, the total impervious area on the parcel is subject to the requirements of this Part; except that the volume controls in § 26-123 and the peak rate controls of § 26-124 do not need to be retrofitted to existing impervious areas that are not being altered by the proposed regulated activity.
6. Stormwater flows onto adjacent or downstream property shall not be created, increased, decreased, relocated, impeded, or otherwise altered without written notification of the affected property owner(s). Notification shah include a description of the proposed development and the stormwater flows that are being created, increased, decreased, relocated, impeded, or otherwise altered. Adjacent property shah at a minimum include any property having a shared boundary with the subject property of the SWM Site Plan, however, if in the judgement of the Designated Plan Reviewer additional properties are being affected, additional notifications may be required. Proof of notification (signed postal receipt for example) shall be included as part of the SWM Plan submission to the Borough. Such stormwater flows shah be subject to the requirements of this Part.
7. All regulated activities shah include such measures as necessary to:
A. Protect health, safety, and property.
B. Meet the water quality goals of this Part by implementing measures to:
(1) Minimize disturbance to floodplains, wetlands, and wooded areas.
(2) Maintain or extend riparian buffers.
(3) Avoid erosive flow conditions in natural flow pathways.
(4) Minimize thermal impacts to waters of this Commonwealth.
(5) Disconnect impervious surfaces by directing runoff to pervious areas, wherever possible.
C. Incorporate methods described in the Pennsylvania Stormwater Best Management Practices Manual (BMP Manuals). If methods other than green infrastructure and LID methods are proposed to achieve the volume and rate controls required under this Part, the SWM Site Plan must include a detailed justification, acceptable to the Designated Plan Reviewer, demonstrating that the use of LID and green infrastructure is not practicable.
8. Infiltration BMPs should be dispersed throughout the project site at strategic locations, made as shallow as practicable, and located to maximize use of natural on-site infiltration features while still meeting the other requirements of this Part.
9. Normally dry, open top, storage facilities should completely drain both the volume control and rate control capacities over a period of time not less than 24 and not more than 72 hours from the end of the design storm.
10. The design storm precipitation depths to be used in the analysis of peak rates of discharge shall be as obtained in PennDOT's Drainage Manual, Pubheation 584, Appendix 7A; or obtained from the latest version of the Precipitation-Frequency Atlas of the United States, National Oceanic and Atmospheric Administration (NOAA), National Weather Service, Hydrometeorological Design Studies Center, Silver Spring, Maryland. NOAA's Atlas 145 can be accessed at: http://hdsc.nws.noaa.gov/hdsc/pfds/.
11. For all regulated activities, SWM BMPs shall be designed, implemented, operated, and maintained to meet the purposes and requirements of this Part and to meet all requirements under Title 25 of the Pennsylvania Code, the Clean Streams Law, and the Storm Water Management Act.
12. Various BMPs and their design standards are listed in the BMP Manuals.
13. The Borough may, after consultation with DEP, approve measures for meeting the state water quality requirements other than those in this Part, provided that they meet the minimum requirements of, and do not conflict with, state law including, but not limited to, the Clean Streams Law.
(Ord. 946, 11/8/2018, §301)