Risk Assessment

Schreiber, Yonley & Associates (SYA) has extensive experience assisting manufacturers with coordinating and reviewing the complex details of multi-pathway risk assessments.  Our risk assessment work has been performed in conjunction with our comprehensive assistance in analyzing plant operations, emissions testing and monitoring, and communicating with agencies and the public on behalf of a facility.  Much of our risk assessment work has been performed for the range of chemical constituents measured in stack emissions.  Some assessments have been tailored to study specific high-profile constituents, such as mercury.

With respect to the cement industry, SYA has been involved with a significant amount of the U.S. multi-pathway risk assessment work since the early 1990s, mostly associated with permitting for use of hazardous waste fuel.  After the draft National Combustion Strategy was announced in 1993, we worked with all of the Region 7 BIF cement facilities to coordinate a common approach that was approved by the EPA and used by all the facilities in the RCRA permitting process.   Additionally, we have worked with all of the Region 4 BIF cement facilities and some of the Region 5 facilities in coordinating and providing technical review of their risk assessments.  Moreover, we have been involved with permitting most of the new kiln systems at hazardous waste burning facilities in the U.S. over the last decade, which has required updating the original risk assessments to reflect future operations.  Most recently, SYA is assisting facilities in performing risk assessments on individual pollutants for assessing and communicating the impact of emissions to the regulatory agencies and the public.

Throughout all of our work on risk assessments, SYA has provided a range of services, from managing the overall project to providing the following types of services:

  • Evaluating and hiring a toxicologist
  • Managing the project
  • Providing technical guidance over the course of the project
  • Generating emissions data for input to the models
  • Performing detailed air and risk modeling
  • Providing detailed review of all technical components
  • Preparing risk assessment protocols and reports
  • Communicating with agencies and permit negotiation
  • Assisting with public communications.

The technical components of the studies we have been involved with include development of a detailed protocol, working with the agencies for protocol approval, providing guidance on the technical input throughout the air dispersion modeling and risk assessment modeling phases, and communicating the results and negotiating terms based on the results of the assessments.  Although the risk assessment community has generally turned to the use of the HHRAP model in recent years, there are many potential options for how the models are used and the decisions that ultimately will impact the final result. SYA has been involved with numerous projects working with various risk assessment firms and state and regional staff.  This experience allows us to be aware of different solutions that can be applied toward obtaining the desired result.