Brent Johnson

Senior Hydrogeologist

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Mr. Johnson is a California licensed Professional Geologist and Certified Hydrogeologist who has ten years of experience as a consulting hydrogeologist for both public and private sector clients. He has broad capabilities in a variety of groundwater resources fields from execution of field studies to hydrogeologic conceptual model development and sustainable groundwater management.

Mr. Johnson has expertise in compliance with and implementation of the Sustainable Groundwater Management Act (SGMA). This included including basin boundary modification applications, conceptual model development, geospatial database construction and management, groundwater elevation and change analyses, and land surface subsidence mapping for Groundwater Sustainability Plans (GSPs). Mr. Johnson works with Groundwater Sustainability Agencies (GSAs) to implement their GSPs, including preparing SGMA Annual Reports, developing and evaluating groundwater monitoring, and supporting grant funding applications. Mr. Johnson has a strong background in spatial data aggregation and application in Geographic Information Systems (GIS). He has used these skills to identify data gaps and design major expansions of multiple GSA's monitoring well networks.

Many of Mr. Johnson's projects involve field investigations and water supply well evaluation or construction. He is an expert in planning and directing field investigations, providing clients with thoughtfully developed, rigorous, and comprehensive programs for the collection of hydrogeologic information and development of water resources infrastructure. This includes siting, designing, and constructing boreholes and wells for lithologic and geophysical data collection, groundwater and interconnected surface water monitoring, water supply, aquifer testing, and recharge by injection. He also leads the Todd Groundwater field geology training program, ensuring that the entire staff have the knowledge and resources necessary to serve our clients.

For many years Mr. Johnson has been focused on managed aquifer recharge (MAR), especially related to recycled water reuse. He has been an integral part of the award winning Pure Water Monterey Groundwater Replenishment Project that injects recycled water into the Seaside Groundwater Basin for indirect potable reuse (IPR). Through management of this project Mr. Johnson has been involved in the design, construction, testing, equipping, operation, and troubleshooting the first IPR injection wells in Northern California.

Professional Credentials and Academic Background:

California Professional Geologist No. 9484
California Certified Hydrogeologist No. 1107

MS, San Jose State University, Geology 2014
BS, The Ohio State University, Geological Sciences, 2008