09/01/2026
Lead. Mercury. Asbestos.
These are contaminants most people have heard of. But what about monochlorobenzene?
Monochlorobenzene (MCB) is a volatile organic compound used in industrial manufacturing. It has been used to produce pesticides, dyes, paints, coatings, and other chemicals. While most people will never encounter MCB directly, it has played a role in manufacturing many products used in everyday life.
MCB is one of the Contaminants of Concern ENTACT is addressing on a 22-acre Integrated Remedial Action Measure (IRAM) project under the Oregon Department of Environmental Quality’s (ODEQ) Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) National Priorities List (NPL) program. The site also contains pesticide impacts.
ENTACT is using in-situ solidification and stabilization (ISS) to treat 150,000 cubic yards of impacted overburden soils. By blending the soil with engineered amendments, the treatment is designed to reduce contaminant mobility and limit the potential for contaminants to leach from the treated material.
Every contaminated site has a history, a pathway, and a reason the contaminants need to be addressed. Understanding those contaminants is an important part of understanding the work ENTACT performs.