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Immediately Dangerous to Life and Health (IDLH), toxic or flammable atmospheric conditions. The greatest potential hazards to safety and health at this site are: 1. Exposure to chemical vapors - through inhalation. 2. Exposure to chemical contamination - through skin contact and ingestion. 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 100 ppm, a NIOSH approved air- purifying respirator with organic vapor cartridges must be worn by all site workers within any area where monitoring results exceed 100 ppm. • 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. 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 25% (LEL) at the borehole or pit. • "Verified" organic vapor levels of< 50 ppm via the PID in the breathing zone. • 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. • Carbon monoxide (CO) levels in excess of the following levels (measurements via detector tubes may be used for the following determinations): CRC Environmental Risk Management,Inc. Project No. 2100-217-2 American Savings Bank 150 West 10th Street February 15, 1995 19 Tracy,California