![]() ![]() This general permit provides coverage for facilities with construction dewatering of groundwater intrusion and/or storm water accumulation from sites less than one acre, and short-term and long-term dewatering of foundation sumps into waters of Massachusetts and New Hampshire. The 2016 Permit was signed April 4, 2016, and will become effective July 1, 2017. The MS4 permit authorizes the discharge of stormwater from small municipal separate storm sewer systems that are located entirely or partially within an urbanized area as determined by the latest census, and are not designated as a medium or large MS4.
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