His work has focused on the characterization of and remediation strategy for industrial, institutional, and residential properties impacted by chlorinated solvents and petroleum hydrocarbons. Specializing in vapor intrusion of volatile compounds into indoor air and LNAPL behavior in soils, his technical experience includes complex regulatory negotiation, construction of conceptual site models (CSMs), vapor intrusion field methods development, LNAPL mobility modeling, and site characterization using hydrogeologic and advanced geophysical methods.
Todd's client service has included oversight, strategy formulation, and participation in public outreach for the United States Department of Defense (DoD) and litigation support for former industrial facilities with historical releases of chlorinated solvents or LNAPL to the subsurface and groundwater impacts extending into residential areas. He has conducted extensive field investigations at these sites under public scrutiny. Recent technical challenges have included mitigation of vapor intrusion to offsite residences, groundwater remedy implementation under major traffic arteries, and construction of a subterranean structure by a third party in a downgradient contaminant plume.
Since 2005, Todd has contributed to multiple applied research projects with DoD and academic partners. Through technical training sessions to agencies and presentations in public forums, he is contributing significantly both to the national discussion on vapor intrusion and to the availability of innovative assessment tools such as quantitative passive samplers, high volume sub-slab sampling, and building pressure control. He was an invited instructor for the 2015 Massachusetts Licensed Site Professional Association's for-credit course on vapor intrusion, reaching 500 professionals, and he is the Fundraising Chairman for the Piscataqua Post of the Society of American Military Engineers.