PM Environmental
Call 1-800-313-2966

Grant DeWitt, P.G.

Senior Project Geologist

Areas of expertise

  • Closure and Remedial Action Reports in accordance with the Natural Resources and Environmental Protection Act, P.A. 451 of 1994, Parts 201 and 213.
  • Baseline Environmental Assessments (BEAs), Continuing Obligations, and Due Care Plan Projects.
  • Phase II Environmental Site Assessments (ESAs) and Site Investigation Projects.
  • Part 201 and 213 projects, including contaminant delineation and remediation using Risk-Based Corrective Action (RBCA) procedures.
  • Resource Conservation and Recovery Act (RCRA) Regulations and Corrective Action Activities.
  • Peer technical oversight to staff members on RBCA Closures.
  • RBCA Tier 1 and Tier 2 Evaluations, aquifer testing analyses, groundwater flow and contaminant fate and transport modeling, and forensic evaluations.
  • Geophysical surveys including electromagnetic, magnetic, and ground penetrating radar methods.
  • Expert Witness for State and Federal Litigation.
  • Presentations

First Order Exponential Regression of Ethylbenzene/Xylenes Ratio for Estimating Release date:

  • National Groundwater Association (NGWA) 4th Annual Groundwater and Environmental Law Conference, 2006, Chicago, Illinois
  • Michigan Basin Geological Society Meeting, 2006, Dimondale, Michigan
  • American Academy of Forensic Sciences (AAFS), 59th Annual Meeting, 2007, San Antonio, Texas NGWA Groundwater Summit, 2007, Albuquerque, New Mexico

Forensic Evaluation to Determine Multiple Release Contributions at UST Sites:

  • NGWA 5th Annual Groundwater and Environmental Law Conference, 2007, Dublin, Ohio
  • AAFS 60th Annual Meeting, 2008, Washington DC

Determination of Free-Phase Conditions using Ethylbenzene/Xylenes Ratio:

  • NGWA Groundwater Summit, 2008, Memphis, Tennessee
  • AAFS 61st Annual Meeting, 2009, Denver, Colorado

Oversight of ASTM E-2531-06: Standard Guide for Development of Conceptual Site Models and Remediation Strategies for Light Nonaqueous-Phase Liquids Released to the Subsurface:

  • MPA/MACS Meeting 2010, Lansing, Michigan

Free Product Determination Using Ethylbenzene to Total Xylenes Ratio

  • AAFS 64th Annual Meeting, 2012, Atlanta, Georgia


  • Temple University B.A. Geology
  • University of Utah Masters in Geology


  • Professional Geologist State of Pennsylvania No. PG-001388-G
  • Certified USE Professional State of Michigan No. 1087


  • OSHA 2a CFR 1910.120 40-hour Safety Training
  • OSHA 2a CFR 1910.120 8-hour Site Supervisor Safety Training
  • OSHA 2a CFR 1910.120 8-hour Annual Refresher Safety Training
  • Meets the definition of Environmental Professional as defined in § 312.10 of 40 CFR 312

Advanced Training

  • ASTM Risk-Based Corrective Action Applied at Petroleum Release Sites
  • Use of MODFLOW for Simulation of Groundwater Flow and Advective Transport
  • Environmental Forensics: Methods and Applications