Cambridege Environmental

58 Charles Street
Cambridge, MA 02141
Phone: 617-225-0810

411 Aviation Way
Frederick, MD 21701
Phone: 301-695-0251

Power Plants & Incinerators

Cambridge Environmental provides consulting services and expertise in the assessment of the potential health impacts of atmospheric emissions from electric power plants, and both municipal and hazardous waste incinerators. Our evaluations of human health and environmental impacts from these sources cover a wide range of capabilities and settings. Cambridge Environmental performs air quality analyses, food-chain studies, ecological impact evaluations, and human health risk assessments to meet the requirements federal, state, and local regulatory agencies. We have conducted these studies to assess local effects of relatively small sources, as well as regional effects of large power plants. We frequently present the results of or work at public hearings where we respond to questions from elected officials and citizens. Cambridge Environmental also applies our expertise and experience in these areas to support companies and organizations engaged in litigation.

Cambridge Environmental's services related to power plants and incinerators are carried out by many of our scientists and engineers. Dr. Stephen Zemba, Dr. Michael Ames, and Mr. Richard Lester perform emissions estimates and calculations, atmospheric dispersion and deposition modeling, modeling of multi-pathway environmental fate and transport of pollutants, and provide interpretation of existing environmental measurements. Dr. Laura Green and Ms. Sarah Armstrong are board certified toxicologists who specialize in evaluating the potential for human exposures to chemicals to cause adverse health effects. Dr. Edmund Crouch has extensive expertise and experience in the statistical analysis of data from air quality monitoring networks, toxicological research, and public health.

Sample Projects

Coal-fired power plants and atmospheric particulate matter

Cambridge Environmental recently completed an extensive assessment of the scientific evidence supporting the often cited view that common atmospheric concentrations of sulfates can be quantitatively linked to increased mortality rates. This assessment was conducted for expert testimony concerning the potential for adverse health effects to arise from exposures to secondary atmospheric particulate matter generated by sulfur dioxide emissions from coal-fired power plants. Based on our review of the scientific and medical literature, and our experience in toxicology, epidemiology, and health risk assessment, we found that the various common sulfates in ambient air - neutral sulfate salts, metallic sulfate salts, and sulfuric acid - are not present in ambient concentrations at or near levels at which they may cause chronic disease or death. We also assert that it is not toxicologically plausible that any and all forms of fine particulate matter (PM2.5) are alike in their potencies - and specifically that ambient sulfates are as toxicologically potent as some other forms of PM2.5. Cambridge Environmental personnel have written and spoken on this matter on numerous occasions.

Food chain impacts of atmospheric emissions from municipal solid waste incinerators

Several years ago, Cambridge Environmental conducted a multipathway (i.e., food chain) human health risk assessment of emissions from the Maine Energy Recovery Company's municipal solid waste-to-energy facility. Because this assessment was performed prior to establishment of most of the official guidance and support programs to conduct such a task, the work was done based on our fundamental knowledge and experience assessing the fate and transport of chemicals in the environment. In the decade following this risk assessment, the U.S. EPA developed numerous regulatory guidelines and models to conduct such multipathway risk assessments. Additionally, the city where the facility was located enacted its own health-based Air Toxics Control Ordinance, conditions and operations at the facility were modified, and a significantly more extensive and detailed set of measurements was made of the facility's emissions. Recently, Cambridge Environmental performed an updated multipathway risk assessment for the facility incorporating the most recent emissions data from all portions of the plant, the U.S. EPA's newest atmospheric dispersion and deposition modeling programs, as well as EPA's finalized multipathway risk assessment guidance. The updated risk assessment confirmed the previous work's conclusions - that emissions from the facility would not pose significant direct or indirect (i.e., food chain) risks to the health of nearby residents, farmers, or fishers.