In 2009 Bryan A Stirrat & Associates (BAS) joined Tetra Tech Inc., a leading provider of consulting, engineering, program management and technical services. Tetra Tech employs 16,000 employees and has 400 offices worldwide.

Becoming part of Tetra Tech has enabled us to provide our clients an unparalleled depth of resources, experience, and stability. Our team of solid waste professionals that has supported our clients since 1984 has not changed.  We continue to provide conventional landfill engineering services, as well as planning and design to support the development of next-generation waste management facilities (anaerobic digestion, composting facilities, landfill gas conversion technologies).

For more information on our expanded capabilities follow us to