Evan Christianson

Experience

• 

  Barr Engineering Co.

  Aug 2007 - now

  Computational hydrogeology practice lead. Specialist in groundwater flow and contaminant transport modeling. Extensive experience in groundwater sustainability evaluations, environmental permitting, hydrogeologic site evaluations, aquifer testing, inverse modeling, groundwater-surface water interaction, wellhead protection, and remedial system optimization.Developed custom modeling methodologies to simulate the full transmission pathway of per- and polyfluoroalkyl substances (PFAS) that originated from an air emission source and eventually impacted groundwater over large areas. This methodology has been applied on some of the largest areas of PFAS-impacted groundwater in the eastern United States. Lead developer of the Twin Cities Metropolitan Area Regional Groundwater Flow Model (Metro Model 2 and 3) which is the foundational model for regional water supply planning in the Twin Cities. Metro Model 3 is also the foundational model for over twenty sub-regional models developed for site specific analysis. Developer of PESTools, a python package to support processing of information generated using the PEST suite of automated inverse calibration software. Show less

  • Vice President, Senior Hydrogeologist

    Jun 2022 - now

  • Senior Hydrogeologist

    Aug 2007 - now