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r <br /> 6.3 Action Levels <br /> i <br /> 6.3 .1. Action Levels for a Temp racy Stop Work, <br /> The SSO shall impose a temporary stop work and contact the <br /> ICES Health and Safety Director immediately if the following <br /> conditions are observed, or if there is a question about site <br /> conditions : <br /> • uncontrolled dust generation <br /> • indications of heat stress <br /> r, changes in the general healtY profile of on-site <br /> I personnel, including symptoms discussed in Section 5 and <br /> k headaches, dizziness, breathing difficulties, irritation <br /> to the eyes, nose, throat, a d hands <br /> • detection of benzene in the hreathing zone . <br /> 6.3 .2 Action Level for Upgrade to Level. C Protection <br /> The action level to upgrade to Le el C protection is the <br /> detection of ambient air concentrations of VOCs in the <br /> breathing zone at 25 ppm or great r without the presence of <br /> benzene . <br /> 6.4 Protection Against Physical Hazards <br /> 6 .4. 1 Noise <br /> Noise results primarily from concrete-breaking equipment, <br /> drilling equipment and other machinery. Workers will wear ear <br /> plugs when operating heavy machinery to avoid noise that may <br /> exceed the 85 decibel Threshold Limit Value established by the <br /> American Conference of Governmental Industrial Hygienists . <br /> However, based on previous field experience, expected noise <br /> level should not exceed 85 decibels . <br /> 6.4 .2 Electric Shock <br /> All electrical equipment to be used during field activities <br /> will be suitably grounded and insulated. <br /> 6.4 .3 Heavy Equipment <br /> Hazards related to site investigation activities will <br /> � necessitate securing the work area. All relevant requirements <br /> 11 <br />