be used in a process-based modeling approach. The SAB has identified in this report several key factors and parameters affecting emissions that the EPA should consider to help develop process-based modeling. The report recommends several alternative approaches for developing a draft process-based lagoon/basin EEM for ammonia emission. The SAB also makes several recommendations regarding the handling of negative and zero values for both direct concentration measurement and calculated EPA’s emission values. The SAB recognizes that the EPA may need to apply statistical approaches to assess emissions while it is developing and evaluating process-based models. The SAB provides suggestions in this report to improve the statistical approach for developing EEMs. Also, the SAB provides a number of agency’s general and specific recommendations to improve the clarity and scientific basis of analyses EPA’s within draft Broiler Report and Lagoon Report. EPA’s The SAB appreciates the opportunity to provide the EPA with advice on this important subject. We look forward to receiving the and to providing future advice on this topic. agency’s response Sincerely, Dr. David T. Allen, Chair Science Advisory Board Enclosures
be used in a process-based modeling approach. The SAB has identified in this report several key factors and parameters affecting emissions that the EPA should consider to help develop process-based modeling. The report recommends several alternative approaches for developing a draft process-based lagoon/basin EEM for ammonia emission. The SAB also makes several recommendations regarding the EPA’s handling of negative and zero values for both direct concentration measurement and calculated emission values. The SAB recognizes that the EPA may need to apply statistical approaches to assess emissions while it is developing and evaluating process-based models. The SAB provides suggestions in this report to improve the agency’s statistical approach for developing EEMs. Also, the SAB provides a number of general and specific recommendations to improve the clarity and scientific basis of EPA’s analyses within EPA’s draft Broiler Report and Lagoon Report. The SAB appreciates the opportunity to provide the EPA with advice on this important subject. We look forward to receiving the agency’s response and to providing future advice on this topic. Sincerely, Dr. David T. Allen, Chair Science Advisory Board Enclosures
EPA-SAB-13-003-signed%20.docx