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• The "stand64" member of the team shall'�ee instructed in the use of emergency hand signals to inform the equipment operator if necessary. Hand signals shall only be used for distances of less than 100 feet. For distances greater than 100 feet, radio communications shall be established. If a radio failure occurs or if the "standby" team member and equipment operator can not maintain visual contact at all times, all work shall be halted until reliable communications can again be established. 4 . Site Security: Signs shall be printed in bold large letters on contrasting backgrounds in English or where appropriate in the predominant language of workers unable to read English. Signs shall be visible from all points where entry might occur and at such distances from the restricted area that employees may read the signs and take necessary protective steps before entering. The area shall be secured to prevent unauthorized entrance. Additionally, a fence shall be installed around the Exclusion Zone to prevent unauthorized entry. All entrance points into the Exclusion Zone shall be monitored for entry. Unauthorized persons shall be escorted out of the Exclusion Zone immediately should unauthorized entry occur. SPILL CONTROL PROCEDURES: 1 . INTRODUCTION The objective of responding to incidents involving the release or potential release of hazardous materials is to prevent or reduce the adverse effects that a release might have on the public's health, property, and the environment. In order to mitigate (prevent or reduce) the incident ' s impact, the release must be controlled. Mitigating releases means controlling them. Measures to control a release involve those processes, methods, procedures, and techniques that are used to prevent or reduce the dispersement of the material or its by-products into the environment. These control measures may include fire extinguishment, controlled burning, neutralization, construction of temporary dams, berms, or dikes, plugging leaking containers, misting or fogging toxic vapors or gases, sorbent materials, and others. Two general control techniques frequently used by first responders are confinement and containment. A. CONFINEMENT consists of methods used to limit the physical size of the area of the release. Hazardous materials can be released (directly or indirectly) , to air, surface water, groundwater, or land surface. Depending on the media affected, various methods are available that might help restrict the spread of materials. 54 site safety s Health Plan Rev./1.0 October 20, 1997