NPDES Permitting

Merrimack Premium Outlets

The client’s project included the cut and fill of over 500,000 cubic yards of rock and soil material for the establishment of a 410,000 square foot open-air outlet mall on a 170-acre site. Princeton Hydro was retained to provide services during the permitting phase through construction to comply with both the Environmental Protection Agency (EPA) National Pollution Discharge Elimination System (NPDES) Construction Stormwater Discharge Permit and the New Hampshire Department of Environmental Services (NHDES) Alteration of Terrain Bureau, Alteration of Terrain (AoT) permit for the concurrent modification of more than 5 acres at one-time.

During meetings conducted with the local land development engineering firm, NHDES was disinclined to allow more than the regulatory minimum clearing based on previously submitted soil erosion and sediment control plans. The submission was complicated by site conditions, including significant, environmentally-sensitive areas along the base of the steep slopes - including vernal pool areas. In conjunction with a meeting conducted by Princeton Hydro with the NHDES regulators, owner, and other project professionals, and a detailed erosion and sediment control plan for the project was approved to allow up to 50 acres of concurrent clearing for the project.

Princeton Hydro provided regular inspection of the site during all clearing and terrain alteration activities to confirm that the modification of the site conformed to the erosion and sediment control plan. Our services included confirming proper posting of the site, maintenance/update of the Stormwater Pollution Prevention Plan (SWPPP), and proactive solutions for possible problematic site conditions during the project.

The project was completed on time and on-budget with no elicit discharges from the site during the construction process.