A. 
Prior to the issuance of any site plan approval or development permit for any proposed development listed below resulting in a land disturbance of one acre or greater, a stormwater management permit, or a waiver of the requirement for a stormwater management permit, must be approved by the Planning Board or its designee under this bylaw. No person shall, on or after the effective date of this bylaw, initiate any land clearing, land grading, earthmoving or development activities without first complying with this bylaw.
B. 
The following uses and activities shall be required to submit drainage reports, plans, construction drawings, specifications and as-constructed information in conformance with the requirements of this bylaw:
(1) 
Subdivisions and construction activities of any kind disturbing one or more acres, including multiple separate disturbances of less than one acre in discontinuous locations or on different schedules, if the activities are part of a larger common plan of development.
C. 
The bylaw shall be applicable to any discharges to the municipal separate storm sewer systems.
D. 
The following activities are prohibited:
(1) 
Illicit discharges. No person shall dump, discharge, cause, or allow to be discharged any pollutant or nonstormwater discharge into the municipal separate storm sewer system (MS4), into a watercourse, or into the waters of the commonwealth.
(2) 
No person shall construct, use, allow, maintain, or continue any illicit connection to the municipal storm drain system, regardless of whether the connection was permissible under applicable law, regulation or custom at the time of connection.
(3) 
No person shall obstruct or interfere with the normal flow of stormwater into or out of the municipal storm drain system without prior written approval from the Planning Board or Superintendent of the Department of Public Works.
The following activities are exempt from the requirements for submittal and approval of a stormwater management plan under Article IV, but must comply with the stormwater performance standards in Article VI:
A. 
Any agricultural activity which is consistent with an approved soil conservation plan prepared or approved by the Natural Resources Conservation Service;
B. 
Any logging which is consistent with a timber management plan approved under the Forest Cutting Practices Act[1] by the authorized state agency;
[1]
Editor's Note: See MGL c. 132, § 40 et seq.
C. 
Additions or modifications to existing residential structures disturbing less than one acre;
D. 
Developments that disturb less than one acre of land, provided that they are not part of a larger common development plan;
E. 
Repairs and maintenance to any stormwater collection system, sanitary sewer collection system, or roadway system deemed necessary by the South Hadley Department of Public Works;
F. 
Any emergency activity that is immediately necessary for the protection of life, property or the environment, as determined by the Department of Public Works or its designee;
G. 
Residential uses disturbing less than one acre;
H. 
Repairs and maintenance of municipal facilities (buildings and grounds, fields, etc.) which do not involve a change in flow of stormwater runoff onto adjoining property;
I. 
Any work of projects for which the required permit applications have been submitted to the Planning Board, Selectboard, Zoning Board of Appeals, and Conservation Commission before the effective date of this bylaw;
J. 
Municipal roadway maintenance when conducted in accordance with an approved stormwater pollution prevention plan, prepared in accordance with the stormwater regulation promulgated under this bylaw;
K. 
Discharge or flow resulting from firefighting activities;
L. 
The following nonstormwater discharges or flows are exempt from the prohibition of nonstormwater discharges provided that the source is not a significant contributor of a pollutant to the municipal storm drain system:
(1) 
Water line flushing.
(2) 
Landscape irrigation.
(3) 
Diverted stream flows.
(4) 
Rising groundwater.
(5) 
Uncontaminated groundwater infiltration [as defined at 40 CFR 35.2005(20)].
(6) 
Uncontaminated pumped groundwater.
(7) 
Discharge from potable water sources.
(8) 
Foundation drains.
(9) 
Air-conditioning condensation.
(10) 
Irrigation water, springs.
(11) 
Water from crawl space pumps.
(12) 
Footing drains.
(13) 
Lawn watering.
(14) 
Individual resident car washing.
(15) 
Flows from riparian habitats and wetlands.
(16) 
Dechlorinated swimming pool discharges.
(17) 
Street wash waters.
(18) 
Residential building wash waters without detergents.
A. 
The stormwater design manual as defined and described in § 200-3 is hereby incorporated by reference as part of this bylaw, and shall furnish additional policy, criteria and information, including specifications and standards, for the proper implementation of the requirements of this bylaw.
B. 
This manual includes a list of acceptable stormwater treatment practices, including the specific design criteria for each stormwater practice. The manual may be updated and expanded from time to time, based on improvements in engineering, science, monitoring and local maintenance experience, at the discretion of the South Hadley Department of Public Works, its designee, or the Massachusetts Department of Environmental Protection. Stormwater treatment practices that are designed and constructed in accordance with these design and sizing criteria will be presumed to meet the minimum water quality performance standards. Unique site circumstances, as determined by the Director of Planning and Conservation or their Designee, may require design and sizing which exceed the minimum water quality performance standards.
C. 
Applicants shall include low impact development best management practices in their site designs as described in the Massachusetts Stormwater Design Manual. In the event that low impact development best management practices are not feasible, applicants shall provide justification regarding why these practices are not appropriate based on the site's size, shape, topography, soil conditions, etc.
D. 
In addition to the requirements described in the Stormwater Design Manual, all stormwater best management practices must also be designed to meet the performance standards described in Section 2.3.6.a.ii.3 and 4 of the Massachusetts Small Municipal Storm Sewer Systems (MS4) permit for new development and redevelopment projects.
To furnish additional policy, criteria and information, including specifications and standards, for the proper implementation of the requirements of this bylaw for erosion and sediment control, the Erosion and Sediment Control Guidelines for Urban and Suburban Areas and Nonpoint Source Pollution Management Guidelines as promulgated by the Massachusetts Department of Environmental Protection or its successor organization are incorporated into and made part of this bylaw. All erosion and sedimentation control plans shall be developed consistent with the requirements the Stormwater Design Manual as well as Section 2.3.5.c.iii and iv of the Massachusetts Small Municipal Storm Sewer Systems (MS4) permit.