Tetra Tech is managing a $1 million, multiyear contract to help the Massachusetts Department of Transportation (MassDOT) comply with the statewide National Pollutant Discharge Elimination System (NPDES) stormwater permit for discharges of highway runoff to impaired waters.

The scope of work includes preparing watershed assessments to determine stormwater best management practice (BMP) requirements, geographic information systems (GIS) mapping and database management, topographic survey, BMP engineering and design, and environmental permitting services. Tetra Tech has completed or initiated 12 task orders, including discharges from:

  • I-290 to Burncoat Park Pond in Worcester
  • I-395 to Lowes Pond in Oxford
  • I-195 to Noquochoke Lake in Dartmouth
  • I-93, I-95 and parallel roads to the Aberjona River in Reading, Winchester, and Woburn
  • I-95 and US Route 1 to Saugus River, Lake Quannapowitt, and Hawkes Pond in Lynnfield, Wakefield, and Saugus
  • I-495 and parallel roads to the Rumford River in Mansfield

Tetra Tech completed watershed assessments to determine the necessary stormwater discharge water quality improvements; identified BMP technologies to address the required improvements; and conducted field investigations, including GIS mapping of the following resources: initial environmental resource features prior to instrument survey, existing drainage basins (along with hydraulic analysis), and wetlands within the project areas.

Tetra Tech has also prepared construction documents for all BMP design tasks to support existing MassDOT construction contracts.