Duffield Associates has been a leader in innovative and sustainable site design, storm and wastewater management, and conservation since our inception more than 30 years ago. Our areas of expertise include the following LEED (Green Building Rating System) activities:

• Construction Activity Pollution Prevention - erosion and sedimentation control plans including NPDES program compliance
  
  
• Site Selection - smart-growth site analysis that considers floodplains, wetlands, endangered species, and riparian buffers
  
  
• Development Density & Community Connectivity - condition assessments of existing buildings, including IEQ evaluation
  
  
• Brownfield Redevelopment - environmental analysis, site characterization, remedial design and implementation, and environmental indemnification and grant funding
  
  
• Alternative Transportation - minimization of parking (and impervious area) through use analysis, ordinance review, and coordination with municipalities
  
  
• Site Development - habitat restoration (wetland delineation, existing vegetation inventories, stream and lake restoration, riparian buffer rehabilitation) and open space maximization (natural resource preservation and protection, wetland mitigation and pond design)
  
  
• Stormwater Design - quantity and quality engineering using best management practices including bioretention areas, bio-swales, infiltration systems, porous pavement, ponds, pollutant source control, and TMDL/NPDES compliance
  
  
• Heat Island Effect - reductions through parking design, land- scaping design, and incorporating green roofs into stormwater management
  
  
• Water Efficient Landscaping - native species plant selection for minimal water usage, capture and reuse of stormwater and gray water for irrigation
  
  
• Innovative Wastewater Technologies - drip/spray system and Rapid Infiltration Basin (RIB) modeling, design, construction and management, design of gray water irrigation systems
  
  
• On-site Renewable Energy - design of geothermal heating/cooling systems, engineering support for wind and solar power systems
  
  
• Materials Reuse and Recycled Content - maximize use of recycled materials (e.g. fly ash, recycled concrete) and promote recycling rather than disposal
  
  
• Construction Waste Management - plan, review, manage (separation) and assist with channeling construction waste
  In addition, Duffield Associates can assist in identifying sustainable design and green building funding sources and developing grant applications. Our construction review services can provide verification and documentation necessary for project certification.