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VZ1 MC <br /> If personnel must enter trenches or other excavations, a "buddy" shall remain near the <br /> excavation to maintain visual contact ("line of sight") with the personnel inside the excavation <br /> at all times The SSO shall develop and teach all site personnel a system of hand signals that <br /> will enable the "buddy" to indicate to support zone personnel that an emergency exists inside <br /> the excavation <br /> The SSO shall monitor the area at least every 15 minutes with the portable direct-reading air <br /> monitoring instruments to detect any changes in gas or vapor contaminant dispersion onsite <br /> In addition, the Action Levels and corresponding Actions as described in the HSP shall be <br /> followed <br /> If the wind changes direction and/or gas, vapor, or dust contamination moves into the <br /> established decontamination or support zones in concentrations that exceed permissible Action <br /> Levels established by the HSP, then the SSO shall direct site personnel to move the support <br /> zone to the new upwind area, confirming the absence of gas or vapor contamination with the <br /> portable direct-reading air monitoring instruments <br /> D Air Monitoring <br /> Direct-Reading Air Monitoring Instruments <br /> The follow direct-reading instruments are available for field work (check all that apply) <br /> 08220010 011 APPENDIX I <br /> 11 <br />