Mark P. Hemingway, P.G.

Vice President, Principal Geologist

 
 
 
 

GSI Mark Hemingway 12A4194 small Mr. Hemingway is a Vice President with GSI and has more than 30 years of experience supervising, conducting, and reviewing hydrogeologic investigations and remedial actions addressing groundwater, surface water, stream sediments, soil gas, and surface and subsurface soils for legal, agribusiness, oil and gas, mining and government clients. Mr. Hemingway has worked on sites with a wide variety of chemical contaminants, including nitrates, chlorinated solvents and their daughter compounds, 1,4-dioxane, brines, and petroleum hydrocarbons. He has conducted or participated in RFI/CMS operations under RCRA, RI/FS operations under CERCLA, underground storage tank (UST) investigations and remediations, and polychlorinated biphenyl (PCB) investigations/remediation activities under TSCA. In addition, Mr. Hemingway has performed investigation and remediation activities under a range of RBCA and non-RBCA state environmental programs. In addition, he has extensive brownfield redevelopment experience, and was the technical project lead for two of the largest brownfield redevelopments in Texas.

Mr. Hemingway has provided expert reports and testimony for numerous litigation and arbitration cases involving response cost allocations, allegations of groundwater, soil, soil gas, and surface water contamination. In addition, he has performed extensive work on professional negligence issues.

In Texas, he has performed work in compliance with the Risk Reduction Rules, TRRP, VCP, IOP, and the Spill Response Rules. He served in an elected capacity as a Director of a Texas Groundwater Conservation District.

Mr. Hemingway has participated in and supervised due diligence/All Appropriate Inquiry assessments, hydrogeologic investigations, and remedial actions in oil and gas fields, refineries, petrochemical plants, and industrial facilities across the United States and internationally. His experience is based on technical review, inspections, and first-hand supervision of inspections, drilling, well installation, sampling, and other field activities.