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monitoring, to detect potentially migrating contaminants, may be conducted to ensure no <br /> hazardous materials are migrating to the surrounding community. <br /> 5.0 EXPOSURE 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/or detector tubes. <br /> Additionally, the program may include a preliminary survey of existing air quality <br /> conditions, prior to any surface disturbances and, if possible, under anticipated "worst case" <br /> weather conditions, to be used to establish baseline levels for input into the respiratory <br /> protection selection process. The Project Safety Officer may also decide to perform <br /> perimeter monitoring of downwind air quality conditions during significant surface <br /> disturbances. <br /> B. Action Levels <br /> If it is determined based on PID readings that total hydrocarbon levels in the work area reach <br /> 10 ppm in the breathing zone for 5 minutes, half mask respirators with organic vapor <br /> cartridges will be required. <br /> If PID readings indicate total hydrocarbon levels reach 25 ppm in the breathing zone for <br /> 5 minutes, work activities will be suspended until the airborne hydrocarbon concentrations <br /> decrease to less than 10 ppm. If airborne levels remain at 25 ppm or more, all work will <br /> cease until all personnel working in the exclusion zone are equipped with full face or if <br /> necessary supplied air respiratory protection including pressure demand air supplied <br /> respirators or self contained breathing apparatus (SCBA). <br /> 920-078.1A/SSP.DOC 6 September 24, 1996 <br />