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Additionally, the program will 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 Photo -ionization detector (PID) readings will be taken and recorded once every hour (minimum) during the performance of these work activities. If it is determined, based on PID readings, that organic vapor concentrations in the work area reach 1 ppm in the breathing zone, half mask respirators with organic vapor cartridges will be required. If PID readings indicate total hydrocarbon levels reach 20 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 20 ppm or more, all work activities will cease until the Company Safety Officer can be notified, and these levels can be ameliorated. 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. A minimum of modified Level D safety equipment and clothing will be required for all workers and visitors on the site. All personnel must be prepared to step up to higher levels of protective equipment as conditions warrant. SSP.Project No. 5 Date