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• <br />monitoring, to detect potentially migrating contaminants, may be conducted to ensure no <br />hazardous materials are migrating to the surrounding community. <br />6111)♦ W 01111.11 DIU (1],I1I C1J R_lari 9 W\\`I <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 />920-124.IA/SSP.DOC 6 December 8, 1997 <br />