Contributor: Philip A. Ramos, CHMM

Contact Information:
Philip A. Ramos, CHMM, PG
Raymond Professional Group, Inc.
300 West Adams Street, 11th Floor
Chicago, IL 60606
Phone: 312 795-6759
Fax: 312 558-9201
Email: philip_ramos@raymondgroup.com 
Title of Presentation: Air Monitoring for nitrogen Dioxide at Chicago Union

Authors: Dale S. Duffala, CHMM, Ronald J. Bachus, Philip A. Ramos, CHMM,

Key Words: Emergency Response, Air Monitoring, Safety, Case Study, Engineering Controls, Chicago Union Station, CUS, Nitrogen Dioxide, NO2,

Abstract:
Objective and Scope - This paper describes the background, monitoring activities, analytical results, conclusions, and recommendations associated with an emergency air monitoring program conducted at Chicago Union Station (CUS) between July and September, 2000. The objective of the monitoring was to determine existing concentrations of nitrogen dioxide (NO2) at various locations in CUS and in the locomotive cabs, and to compare these with levels found after implementation of several interim engineering controls. The interim engineering controls were designed to provide immediate reductions in NO2 concentrations while long-term modifications to the CUS ventilation systems were being analyzed. In addition, interim modifications to locomotive cabs and operating procedures were also implemented.

Issues - CUS is owned and operated by AMTRAK, the trains are owned by METRA, and Burlington Northern/Santa Fe Railroad (BNSF) engineers operate the trains. There were several internal issues that surfaced before and during the monitoring that underscored the need for a project approach that satisfied all 3 principal parties. In addition, the choice of equipment for measuring the NO2 concentrations became an issue related to OSHA compliance with applicable workplace standards. These issues were all resolved in a professional manner, allowing the results to be accepted by all parties as valid.

Developments - The primary developments to occur from this project are the modifications to the ventilating systems at CUS. These modifications are currently in the design phase, and will be implemented as soon as possible to effect permanent beneficial changes in CUS air quality.

Conclusion - Through the application of good science and professional knowledge, the project team was able to visibly affect the air quality at CUS for the better. Even thought the permanent engineering controls are not yet installed, we were able to demonstrate that the interim engineering controls achieved a significant reduction in NO2 concentrations in both the station itself and the locomotive cabs.