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response personnel, and the environment. Of major concern are the <br /> real or potential dangers from fire, explosion, and airborne <br /> contaminants, and, to a lesser degree, from radiation and oxygen <br /> deficient atmospheres . The following items should be -evaluated <br /> during the initial site survey: <br /> - Organic Vapors and Gases <br /> - Inorganic Vapors and Gases <br /> - Radiation <br /> - Oxygen Deficiency <br /> - Combustible Gases <br /> - Visual Observations - While on site, .the initial entry <br /> team should make visual observations to help evaluate <br /> site hazards, for example, dead fish or other animals; <br /> land features; wind direction; labels on containers <br /> indicating explosive, flammable, toxic, or corrosive <br /> materials; conditions conducive to splash or contact <br /> with unconfined liquids, sludges or solids; and other <br /> general conditions . <br /> Direct-reading instrument data - A variety of toxic air <br /> pollutants (including organic and inorganic vapors, <br /> gases, or particulates) can be produced at abandoned <br /> waste sites , result from fires at chemical <br /> manufacturing, storage, reprocessing, or formulating <br /> faciiities, or result from fires involving pesticides . <br /> Direct-reading field instruments will not detect or <br /> measure all of these substances . Thus, negative <br /> readings should not be interpreted as the complete <br /> absence of airborne toxic substances . Verification of <br /> negative results is accomplished only by collecting air <br /> samples and analyzing them in a laboratory. Table 10-1 <br /> provides a list of monitoring instruments and <br /> appropriate responses to instrument readings. <br /> 10-7 <br />