Stormwater & Permitting


Our expertise includes designing innovative stormwater treatment systems that meet many budgets and project footprints while adhering to applicable environmental permit requirements. Our engineers have expertise in stormwater design, stormwater management and hydrologic and hydraulic analysis, including drainage area delineations, peak flow rate calculations and water quality calculations. We have proven experience in the planning and design of stormwater management systems, and we routinely perform drainage design on our state agency and municipal transportation projects. We have helped municipalities, regional authorities, state agencies, federal agencies, and private clients protect receiving waters, and reduce flood damage costs throughout New England. 


Our Stormwater and Permitting Group has an in-depth understanding of local, state and federal permitting thresholds and we can readily determine the applicability of permit requirements to proposed projects and the potential cost and schedule impacts. Our team consists of professional engineers, environmental scientists, cultural resource specialists, land surveyors, and landscape architects. Working together, we can tailor a project’s design to most advantageously address the potential environmental impacts. Our permitting staff have extensive experience in navigating through permitting obstacles as well as working closely with the regulatory agencies to achieve permit approvals in a timely manner. The need for extensive environmental permitting can add considerable time onto project schedules. Our first effort on our projects is to look for ways to avoid and minimize environmental impacts as much as possible.

Wetland Services

Green provides wetland services to assist clients with the environmental permitting and mitigation process from site feasibility through final design and construction. We perform wetland delineation and assessment, natural resource evaluations, and wetland mitigation design. We are fully experienced in conducting wetlands delineation and wildlife habitat evaluations in accordance with the Massachusetts Wetlands Protection Act as well as rare species habitat assessments under the Massachusetts Natural Heritage & Endangered Species Program. 

Massachusetts Permitting Services: 

  • Notices of Intent (NOI) for local conservation commissions
  • Massachusetts Environmental Policy Act (MEPA) documents (Environmental Notification Forms)
  • 401 Water Quality Certificates (WQCs) for MassDEP
  • Chapter 91 Licenses for MassDEP
  • 404 Pre-Construction Notification (PCNs) for U.S. Army Corps of Engineers
  • Stormwater Pollution Prevention Plans (SWPPPs) for National Pollutant Discharge Elimination System (NPDES) compliance
  • CZM consistency
  • MWRA 8(m) permits for both sewer and water
  • Site Plan Applications for local Planning Boards
  • MESA Coordination for Endangered Species/Habitat
  • Wildlife Habitat Assessments

Rhode Island Permitting Services: 

  • RIDEM Request to Verify Delineated Edge of Wetlands
  • RIDEM Application for Preliminary Determination of Applicability (PDA)
  • RIDEM Application to Alter a Freshwater Wetland
  • RIDEM Water Quality Certification
  • RIDEM RIPDES Construction General Permit
  • CRMC Assent A Applications

Vermont Permitting Services: 

  • 3-9020 Construction General Permit
  • 3-9050 (formerly 3-9015) General Permit for Stormwater Discharges
  • U.S. Army Corps of Engineers (ACOE) Permit
  • Flood Hazard Area & River Corridor General Permit
  • Stream Alteration Permit

Stormwater Management

Area A-7 East Boston Police Station
East Boston, MA

Permitting Services

Greenville Road over Walker Brook
Townsend, MA