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= r <br /> If personnel must enter trenches or other excavations, a "buddy" shall remain near the <br /> excavation to maintain visual contact ("line ofsight") with the personnel inside the <br /> excavation at all times. The SSO shall develop arid 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 j <br /> air monitoring instruments to detect any changes in gas or vapor contaminant dispersion <br /> onsite. In addition, the Action Levels and corresponding Actions as described in the HSP <br /> 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 S SO shall direct site personnel to move <br /> the support zone to the new upwind area, con irming 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 Inratruments <br /> The follow direct-reading instruments are availabl a for field work (check all that apply): <br /> Organic Gases and Vapors: <br /> Thermo Environmental Organic Vapor Meter (OVIA) X <br /> HNu Photoionizer <br /> Photovac Microtip <br /> Foxboro Organic Vapor Analyzer <br /> Colorimetric Detector Tubes X <br /> 11 <br />