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If a compound had not already been targeted according to the methods outlined above, further review was conducted. The decision process included evaluating other aspects of the compound's toxicology and potential concentrations. If information was lacking, the compound was not included as a target compound. A list of all EPA field-monitored compounds considered and their maximum reported values is presented in Table 11. Data from the controlled test program for the "chunk" configuration (considered most representative of actual tire fire emissions by Adolfson in their evaluation) were presented in Tables 1 through 6 above and are not repeated in Table 11 (Ryan, 1989). In some cases, where data are available for the same compound, the laboratory test data may be higher than the EPA field data. The authors used the highest concentration of the two data sets in selecting the target compounds. Some further clarification of the Adolfson Associates reference is necessary. The text of the report refers to 38 target compounds, however, only 37 were presented. Furthermore, concentration data for "chloride" and "fluoride" were presented. These are omitted in this report because these values represent the total concentration of each respective ion and not specific toxic compounds. Adolfson Associates assumed data for zinc was zinc chromate, a carcinogen, and reported it as a target compound. However, this was not substantiated based on a review of the tire fire data, which simply reported "zinc." Therefore zinc, which is not a carcinogen, was also eliminated from the Adolfson target list. The net result is that only 34 compounds are target compounds, using the Adolfson screening method. The 34 target compounds and their criteria for selection are presented in Table 12. The carcinogenic target compounds and their maximum reported concentration are presented in Table 13 (the source of the data, i.e., "Field" for EPA field data, or "Lab" for controlled test data is indicated). Compounds that had reported concentrations exceeding 33% of their TLV are presented in Table 14. Compounds that had reported concentrations exceeding their subchronic and/or chronic reference concentrations are presented in Table 15. The compilation of data reported in Tables 11 and 13 includes field monitoring data that is often hastily collected and is influenced by changing fire conditions, meteorological variations, and other factors. The quality of this data is questionable, and no detailed analyses of individual monitoring data were performed as part of this study. However, the data are useful in identifying those compounds that are clearly present during a tire fire. It is recommended that ambient monitoring of air contaminants be conducted during the initial approach and over the course of the fire. This monitoring data will assist policy managers and fire management personnel in making decisions on the level of protective equipment to be worn and evacuation of civilians. Direct-reading instruments are recommended for the initial response to the fire. This type of equipment can be useful in providing immediate data on IDLH conditions, toxic levels of airborne contaminants, and flammable atmospheres. This data will allow the emergency response team to size up the situation and begin making informed decisions. For more complete information on the 24