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00 0 <br />2. If portable direct -reading air monitoring instruments read <br />background throughout the site, the exclusion zone shall <br />be defined around the area(s) of known or suspected <br />chemical contamination, or where drilling, excavation, <br />soil sampling, or other invasive activity is to be <br />performed. <br />(b) Decontamination zones <br />(i) The SSO shall establish a decontamination corridor adjacent <br />to and upwind from identified exclusion zones. The SSO <br />shall set up both equipment and personnel decontamination <br />areas outlines under "Decontamination Procedures" below. <br />(c) Support Zone <br />(i) The SSO shall establish support zones upwind from the <br />decontamination corridor where all portable direct -reading <br />air monitoring instruments read background, at a distance of <br />at least 20 meters from the exclusion zone. <br />(ii) The support zone shall be established such that support <br />personnel may observe all personnel in the exclusion zone at <br />all times. <br />(iii)If personnel must enter trenches or other excavations, a <br />"buddy" shall remain near the excavation to maintain visual <br />contact ("line of sight'? with the personnel inside the <br />excavation at all times. <br />(iv)The SSO shall develop and teach all site personnel a system <br />of hand signals that will enable the "buddy" to indicate to <br />support zone personnel that an emergency exists inside the <br />excavation. <br />