Regulated activity, as defined in § 22a-354h, shall not be prohibited in aquifer protection areas on any municipally owned site undergoing remedial action pursuant to 40 C.F.R. § part 271 at the time the applicable aquifer protection area is designated on a municipal zoning district map or inland wetland map, provided: (1) No such regulated activity substantially commenced or was in active operation for the five-year period preceding the date that the applicable aquifer protection area is designated on a municipal zoning district map or inland wetland map, and (2) any person who engages in such regulated activity for the ten-year period commencing on the date that such applicable aquifer protection area is designated on a municipal zoning district map or inland wetland map registers such regulated activity on a form prescribed by the Commissioner of Energy and Environmental Protection and in accordance with the provisions of § 22a-354i-7 of the regulations of Connecticut state agencies.