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Immediately Dangerous to Life and Health (IDLH), toxic or flammable atmospheric <br /> conditions. <br /> The greatest potential hazards to safety and health at this site are: <br /> 1. Exposure to chemical vapors - through inhalation. <br /> 2. Exposure to chemical contamination - through skin contact and ingestion. <br /> Ongoing air monitoring during project tasks will provide data to ensure that vapor <br /> concentrations are within acceptable ranges and will provide adequate selection criteria for <br /> respiratory and dermal protection. A Photo Ionization Detector (PID) shall be utilized for <br /> monitoring with a I part per million (ppm) detection limit. <br /> • If PID readings taken in the breathing zone exceed 100 ppm, a NIOSH approved air- <br /> purifying respirator with organic vapor cartridges must be worn by all site workers <br /> within any area where monitoring results exceed 100 ppm. <br /> If FID readings taken in the breathing zone exceed 750 ppm, Level B protection will <br /> be required. Personnel must leave site immediately and contact FSS or Health & <br /> Safety Manager for further instructions. <br /> • <br /> Respirator cartridges will be changed once per day as a minimum. This can be <br /> accomplished at the end of the work day during respirator decontamination. If odor <br /> breakthrough is detected while wearing the respirator or breathing becomes difficult, <br /> change cartridges immediately. <br />' 9.1 Stopping Work <br />' Criteria for stopping work and evacuating personnel from the work zone are listed <br /> below. Once work is stopped due to a reason listed below, operations, work practices <br /> and protective strategies will be re-evaluated and modified, if necessary, through <br />' consultation with the FSS prior to resuming activity. <br /> The detection of combustible gas levels in excess of 25% (LEL) at the borehole or pit. <br /> • "Verified" organic vapor levels of< 50 ppm via the PID in the breathing zone. <br /> • The detection of gaseous contaminants that cannot be removed by the Level <br /> C respirator at levels above 50% of the OSHA PEL as measured at the <br /> breathing zone via detector tubes. Example: 1-12S, HCN, mercury vapor. <br />' EXCEPTION: Carbon monoxide - see below. <br /> • Carbon monoxide (CO) levels in excess of the following levels (measurements <br /> via detector tubes may be used for the following determinations): <br /> Its <br /> CRC Environmental Risk Management,Inc. Project#2100-250-2 <br /> American Savings Bank 222 North El Dorado Street <br /> April 6, 1995 19 Stockton,California <br /> I <br /> I <br />