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h' i 4.0 RISK ASSESSMENT SUMMARY It is anticipated that there will be no significant or major potential source of exposures due to the scope of work to be followed on this project. The potential of any increased risk of exposure on other workers or the surrounding community is minimal. The basic potential exposure would probably originate from airborne dusts, during the drilling of the monitoring wells, and those dusts containing low level concentrations of VOC materials in the soils. Due to this potential, the Contractor will have equipment on-site to provide for dust control during the drilling activities, if,it appears that dust control is warranted. Also, perimeter air. monitoring, to detect potentially migrating contaminants, may be conducted to ensure no hazardous materials are migrating to the surrounding community. 3 5.0 EXPOSURE MONITORING PLAN A. General An air quality monitoring program shall be implemented to provide baseline and on-going air quality data for site operations. This program shall include an on-going evaluation of on-site atmospheric contaminant concentrations during work site activities 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 moni- toring 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 vapor cartridges will be required. i 9110081A/SSP 6 December 22, 1997