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v •-J 2. Exposure to chemical contamination -through skin contact with and ingestion of soil. Ongoing air monitoring during project tasks will provide data to ensure that vapor concentrations are within acceptable ranges and will provide adequate selection criteria for respiratory and dermal protection. A Photo Ionization Detector (PID) shall be utilized for monitoring with a 1 part per million (ppm) detection limit. • If PID readings taken in the breathing zone exceed 25 ppm sustainable above background, a NIOSH approved air-purifying respirator with organic vapor cartridges must be worn by all site workers within the area where the sustainable elevated level exists, until the level is reduced. • If PID readings taken in the breathing zone exceed 750 ppm, Level B protection will be required. Personnel must leave site immediately and contact FSS or Health & Safety Manager for further instructions. • Respirator cartridges will be changed once per day as a minimum. This can be accomplished at the end of the work day during respirator decontamination. If odor breakthrough is detected while wearing the respirator or breathing becomes difficult, change cartridges immediately. If the entry is done "under air", Supplied Air requirements must be adhered to as well. 9.1 Stopping Work Criteria for stopping work and evacuating personnel from the work zone are listed below. Once work is stopped due to a reason listed below, operations, work practices and protective strategies will be re-evaluated and modified, if necessary, through consultation with the FSS prior to resuming activity. The detection of combustible gas levels in excess of 10 % (LEL) in air, where fans or air circulation are unable to reduce the LEL less than 10%. • "Verified" and sustainable organic vapor levels of >50 ppm via the PID in the breathing zone for periods exceeding 30 minutes. 0 The detection of gaseous contaminants that cannot be removed by the Level C respirator at levels above 50% of the OSHA PEL as measured at the breathing zone via detector tubes. Example: HzS, HCN, mercury vapor. EXCEPTION: Carbon monoxide - see below. Avalon Environmental Consultants 9627-001-6 Kashmar Singh Joes Truck Plaza January 9, 2001 15 Lathrop, California