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TABLE 4.1 <br /> Field Activities,Action Levels <br /> and Appropriate PPE <br />' OVA Reading <br /> Colorunetric Above <br /> indicator Background PPE <br /> Activity Tube Results (ppm) 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,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 /> 1 <br />