Our Services

We offer a wide range of environmental consulting services to serve potential client needs.With over four decades combined experience, our staff specializes in instream flow studies, hydraulic habitat modeling, quantitative fish population studies, and the writing of NEPA/CEQA related environmental documents.Please refer to the “Services” tab for a complete detailed listing of our abilities.

Thomas Gast & Associates Environmental Consultants is a California-certified small business (SB# 1796367), dedicated to provide the most cost-effective, innovative, and science-based results for the most challenging natural resource dilemmas. We provide innovative solutions for complex environmental issues.

Let us be your problem-solvers!



TGAEC publishes an online geodatabase of oceanographic documents

The geolibrary contains decades of oceanography research from the personal collections of Humboldt State University Professor Dr. James Avery Gast and University of Washington Professor Dr. Tommy Thompson.  TGAEC scanned the documents, constructed an online searchable geodatabase,  and is making the documents available free on request.  Check it out here: