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TABLE 1 <br /> Field Activities,Action Levels <br /> and Appropriate PPE <br /> i <br /> iOVA Reading <br /> Colonmetric Above <br /> Indicator Background PPE <br /> iActivity 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 /> i10-50 Level C,full-face respirator <br /> organic vapor cartridges <br /> i >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 /> t200-500 Level C,fuIl-face respirator <br />' organic vapor cartridges <br /> >500 Cease operations&wait for <br /> vapors to dissipate <br /> r <br />