Mary Holkenbrink is a Senior Project Geologist at Engineering/Remediation Resources Group, Inc. since August 2004, following a role as Project Geologist. Prior experience includes a position as a Geologist at Tetra Tech from December 1993 to August 2004. Mary Holkenbrink holds a Bachelor of Science degree in Geology from UC Riverside, acquired between 1987 and 1992, and also attended Oregon State University.