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Fires involving spills or releases of substances which, before combustion, were defined as hazardous substances are covered by 1910.120(q). A response to a fire is considered an emergency response to the release of a hazardous substance if the material on fire can be classified as a hazardous substance before it ignited. Fires involving spills or releases of substances not classified as hazardous substances before combustion are not included in the scope of 1910.120. Similarly, structural fires and burning of houses, wood, etc. would not normally be covered by HAZWOPER.