SUSTAINTECH™
CONFERENCE

The goal of the workshop is for the participants to apply the MStC standard to specific sites and to understand how MStC could enhance provincial and federal petroleum UST cleanup programs.  The workshop is intended for UST owners, corrective action professionals, and regulators who wish to learn how they can apply MStC principles at individual sites, as well improve regulatory policy. The workshop will introduce the participants to the Moving Sites to Closure (MStC) standard guide and demonstrate its application through a series of exercises with example sites.

Workshop participants will work through examples of applying alternative criteria to determine when the threat to human health and the environment is low enough to close a petroleum UST corrective action project. They will also learn best management practices for evaluating the effectiveness of the current remedy and overcoming non-technical obstacles such as access issues that are stalling the progress of corrective action. The presenters will help the participants tie together the latest scientific understanding of petroleum UST releases, best practices from various state UST remediation programs, other ASTM standards, and ITRC guidance. The workshop will walk the participants through the standard, the major departures the standard recommends from current practices, and examples of how the standard can be applied to example sites.

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Tom Schruben's Bio:

Tom Schruben is a physical scientist in the EPA Office of Underground Storage Tanks where he concentrates on cleanup issues. He started his professional career as an environmental engineer in 1981. In 1986, he joined EPA OUST to help write the Federal UST regulations and to assist State regulatory programs and State Funds with corrective action issues. From 1992 to 2021, he: developed and managed environmental insurance programs; facilitated redevelopment at Brownfields; and consulted on environmental litigation. He has participated in the development of numerous ASTM standards, including Risk Based Corrective Action, and is currently Chairing ASTM’s Moving Sites to Closure Task Group.

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Kenneth Walker's Bio:

Kenneth "Neth" Walker, PE, PG is a senior geologist, hydrogeologist, and engineer with GSI Environmental Inc. He has over fourteen years of professional experience in the environmental field, which includes site investigation and risk assessment at federal, state, and commercial/industrial properties, including with leaking underground petroleum storage tanks. He has provided litigation support on a variety of environmental matters around the US and internationally. Mr. Walker has experience with numerous chemical classes, including chlorinated solvents, hydrocarbons, and per- and polyfluoroalkyl substances (PFAS). Mr. Walker has designed and implemented thermal monitoring hardware for natural source zone depletion (NSZD) at numerous LNAPL sites. He was involved with the development of the ASTM E3361-22 Standard Guide for Estimating Natural Attenuation Rates for Non-Aqueous Phase Liquids in the Subsurface, and he has led the development of training materials for the ASTM E3488-25 Standard Guide for Moving Sites to Closure (MStC).