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.


Our Services

TGAEC Hires Melissa Collin

Melissa is a Geospatial Sciences Major with an Ecological Restoration Minor from HSU.  She is working on our Bathymetry Projects, setting up the VELMA model for the Tenmile Creek Water Conservation Pilot Project, as well as working with the HSU Geospatial Department developing a platform to host the ADCP Water Velocity Visualization Tool for DWR.  We are very happy to have her on our team!

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!