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TABLE 1 <br /> Field Activities,Action Levels <br /> and Appropriate PPE <br />' OVA Reading <br /> Colorimetric Above <br /> Indicator Background PPE <br />' Activity Tube Results (ppm) Required <br /> Drilling,Sampling Benzene Present 0-1 Level D <br /> &Well Consruchon <br /> 1-10 Level C,half-face respirator, <br /> organic vapor cartridges <br /> 10-50 Level C,full-face respirator <br /> organic vapor cartridges <br /> >50 Cease operations&wait for <br /> vapors to dissipate <br />' Drilling,Sampling Benzene NOT Present 0-50 Level D <br /> &Well Consruction <br /> 50-200 Level C,half-face respirator, <br />' organic vapor cartridges <br /> 200-500 Level C,full-face respirator <br />' organic vapor cartridges <br /> >500 Cease operations& wait for <br />' vapors to dissipate <br /> 1 <br /> I <br /> r <br /> r <br />