Our engineers, scientists and technicians have extensive experience in solid waste management engineering and construction that exceeds minimum criteria established by the USEPA, NICET, GCI and the geosynthetics industry. We provide a unique combination of services that blends our engineering expertise in design, permitting and construction with our in-house soils and geosynthetics laboratory testing capabilities, field testing, field observation and surveying experience, particularly in the area of geosynthetics that is rarely offered in total within the engineering community in North America.

Services provided include:

• Landfill Design
• Permitting
• Third Party CQA
• Construction Management
• Geosynthetics Design
• Ground Water Monitoring
• AASHTO Certified Soils and Concrete Laboratory
• Complete Geosynthetics Laboratory
• Interface Shear Testing
• NICET, ACI and GCI Certified Field Technicians
• ASTM D35 Committee on Geosynthetics Member

Duffield Associates has worked on over 80 landfills in 14 states. Our team has been involved during the design and/or construction phases of these facilities in the role of consulting engineers and/or quality assurance field and laboratory testing, inspection and third party certification. Through this experience, we are quite familiar with the typical requirements of most regulatory entities and geosynthetic installers both in the permitting and construction processes.