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WZI INC <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 <br /> excavation at all times The SSO shall develop and teach all site personnel a system of <br /> hand signals that will enable the "buddy" to indicate to support zone personnel that an <br /> emergency exists inside the excavation <br /> The SSO shall monitor the area at least every 15 minutes with the portable direct-reading <br /> air monitoring Instruments to detect any changes in gas or vapor contaminant dispersion <br /> on-site In addition, the Action Levels and corresponding Actions as described in the <br /> HSP shall be 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 <br /> Action Levels established by the HSP, then the SSO shall direct site personnel to move <br /> the support zone to the new upwind area, confirming the absence of gas or vapor <br /> • contamination with the 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 /> Organic Gases and Vapors <br /> Thermo Environmental Organic Vapor Meter (OVM) X <br /> HNu Photoionizer <br /> Photovac Microtip <br /> Foxboro Organic Vapor Analyzer <br /> Colorimetric Detector Tubes X <br /> 0 <br /> Appendix II <br /> Page 11 <br />