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8 INC <br /> If personnel must enter trenches or other excavations a "buddy"dy 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-Readi ig Air <br /> Monitorinq Instruments <br /> ' The follow direct-reading instruments are available for field work (check all that apply) <br /> I <br /> i <br /> 1 <br /> • APPENDIX i <br /> ' 08220010 005 11 <br />