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The potential for exposure due to inhalation would probably originate from airborne vapors, <br />gas, or dusts. Due to the nature of this project, it is necessary to perforin excavation activities <br />at the site. Dust suppression measures may be required if it is deemed that airborne materials <br />pose a hazard. These measures will include slowing the pace of work to minimize agitation <br />Of possible airborne materials and water saturation to minimize airborne materials. <br />With respect to direct contact, personal protective equipment such as gloves, eye protection, <br />and skin protection will provide protection from potential exposure. Further, the amount of <br />direct contact with potential contaminants, other than airborne dusts, will be limited. <br />Should respiratory irritation occur, appropriate air -purifying respiratory protective devices <br />will be worn, with organic vapor cartridges and dust pre -filters, or with high efficiency <br />organic vapor/NEPA stack -type cartridge. Typically, the cartridge will require replacement <br />daily. Should direct contact occur in excess of what is anticipated through sample <br />preservation procedures, appropriate protective clothing will be wom. <br />Physical hazards on-site have been identified as hazards associated with soil sampling, soil <br />excavation, and soil transport activities; fire and explosion due to the presence of petroleum <br />hydrocarbons; and general safety hazards. <br />5.0 AIR MONITORING PLAN <br />A. General <br />An air quality monitoring program shall be implemented to provide baseline and on-going air <br />quality data for site operations. This program shall include an on-going evaluation of on-site <br />atmospheric contaminant concentrations during work site activities that involve significant <br />surface disturbances using organic vapor detection instruments and detector tubes. <br />Additionally, the program will include a preliminary survey of existing air quality conditions, <br />prior to any surface disturbances and, if possible, under anticipated "worst case" weather <br />conditions, to be used to establish baseline levels for input into the respiratory protection <br />selection process. The Project Safety officer may also decide to perform perimeter <br />monitoring of downwind air quality conditions during significant surface disturbances. <br />B. Action Levels <br />Photo -ionization detector (PID) readings will be taken and recorded once every hour <br />(minimum) during the performance of these work activities. If it is determined, based on PID <br />readings, that organic vapor concentrations in the work area reach 1 ppm in the breathing <br />zone, half mask respirators with organic vapor cartridges will be required. <br />SSP.Prnjecr .Nn. 4 <br />Urue <br />