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rt ' 1 that involve significant surface disturbances using organic vapor detection instruments and/or detector tubes. Additionally, the program may include a preliminary survey of existing air quality conditions, prior to any surface disturbances and, if possible, under anticipated 'Worst case weather conditions, to be used to establish baseline levels for input into the respiratory protection selection process. The Project Safety Officer may also decide to perform perimeter monitoring of downwind air quality conditions during significant surface disturbances. B. Action Levels If it is determined based on PID readings that total hydrocarbon levels in the.work area reach 10 ppm in the breathing zone for 5 minutes, half mask respirators with organic i vapor cartridges will be required. If PID readings indicate total hydrocarbon levels reach 25 ppm in-the breathing zone for 5 minutes, work activities will be ,suspended until the airborne hydrocarbon concentrations decrease to less than 10 ppm. If airborne levels remain at 25 ppm or more, all work will cease until all personnel working in the exclusion zone are equipped with full face or if necessary supplied air respiratory protection including pressure demand air supplied respirators or self contained breathing apparatus (SCBA). 6.0 PERSONAL PROTECTIVE EQUIPMENT A. Introduction It is important that personal protective equipment and safety requirements be appropriate to protect against the potential hazards at the site: Protective equipment will be selected based on the contaminant type(s), concentration(s), and route of entry. In situations where the type of materials and possibilities of contact are unknown or the hazards are not clearly identifiable, a more subjective determination must be made of the personal protective equipment. 3104001/SSPDRILL 7 October 7, 1993 i