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R&B Trucking Ift•► .We Project No.01-37.1.1 March 27,1990 Page 10 colored delineators. All unauthorized personnel will not be allowed access into the work space. The project supervisor shall coordinate all field activities and shall maintain the safest possible working environment at all times. If an emergency occurs, the supervisor should immediately contact the proper authorities. 8.1.2 Skin and Head Protection Disposable suits,boots,and gloves will be worn when the working conditions require such precautions. Disposable plastic gloves will be worn at all times during soil and ground water sampling. The gloves will be changed after each sample has been collected. Used disposable clothing will be properly discarded at the end of each working day. Hard hats will be worn during drilling, excavation, and other activities in which potentially dangerous equipment is being operated within the work space. 8.1.3 Face and Respiratory Protection During drilling and excavation activities, the working air space will be periodically monitored with either a Photo Ionization Detector (PID) or SKC Color-Detector Tubes(Draeger Tubes)for gas and vapor content. The PID measures the total organic compounds(VOCs)vapor concentration while the Detector Tubes measures the levels of specific compounds in the air being sampled. Monitoring of the working air space shall be concentrated around the drilling rig and in the down wind direction. — If working air space concentrations exceed the Permissible Exposure Limits (PEL), then the workers will wear respirators with organic vapor cartridges. Applicable PEL values include the following: Benzene 1 ppm Toluene 200 ppm Xylenes 100 ppm Ethylbezene 100 ppm If working air space at the perimeter of the working space has levels that exceed the Permissible Exposure Limits for more then 15 minutes, then the drilling or excavation activity will halt until the concentrations can be maintained below the Permissible Exposure Limits.