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US: 888.298.5162

Global: +1.781.952.6000



Mark Jirgal PG

Division Manager, Environmental

Mark Jirgal, PG is a Division Manager for VERTEX located in Irvine, California. Mark has 30 years of experience in the Environmental Consulting industry conducting and directing thousands of Phase I ESAs, Phase II site investigations, and remediation projects throughout the United States. He has performed or directed assessment activities on a wide variety of properties including vacant land, agricultural land, residential and commercial developments, and industrial facilities.

Mr. Jirgal has provided litigation support for both local and international law firms including cases involving co-mingled plumes, Potentially Responsible Party (PRP) identification and remediation cost allocation. His litigation support experience includes gasoline service stations, commercial office properties, aerospace facilities, waste oil re-refining and oil packaging facilities.

Prior to joining VERTEX, Mark held positions ranging from Staff Geologist to Project Manager and Technical Coordinator at environmental consulting firms located in Southern California. He was previously a Senior Consultant with KPMG, LLP in their Forensic and Litigation Services department providing litigation support for international law firms.

Mr. Jirgal has proven project management experience and has overseen hundreds of hydrogeological investigations utilizing a wide variety of investigative techniques including hollow-stem auger, dual-tube percussion, mud-rotary, direct-push, cone-penetrometer and sonic drilling techniques to investigate properties impacted by petroleum hydrocarbons, chlorinated solvents and perfluoroalkyl substances. In additional to subsurface hydrogeological investigations, He has also designed and conducted indoor air and soil gas surveys.

Clients Mark has worked with include financial and insurance institutions, real estate developers, real estate investment trusts, integrated oil companies, oil field service companies, energy providers, plating facilities and others in the commercial and industrial sector.

Education & Certification

B.S., Resource Development, University of Maryland
B.S., Geology, University of Maryland

Professional Geologist (PG), State of California
Certified Environmental Manager (CEM), State of Nevada

Expert Witness Services

Environmental, Air Quality