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TABLE 4-1 <br /> Field Activities,Action Levels <br /> and Appropriate PPE <br /> OVA Reading <br /> Colorimetne Above <br /> Indicator Background PPE <br /> Activity Tube Results (ppni) Required <br /> Drilling, Sampling Benzene Present 0-1 Level D <br /> & Well Consruction <br /> 1-10 Level C, half-face respirator, <br /> organic vapor cartridges <br /> 10-50 Level C, frill-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 Levet 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 />