ARCHIVED REPORTS XR0001833 - Laserfiche WebLink

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• Potential Physical Hazards Trenching - Dangerously high fuel vapor levels will be monitored using an LEL meter The presence of underground utilities are also of concern, and Underground Service Alert will be notified in advance of any trenching work for identification of all underground utilities in the immediate area Drilling -Dangerously high fuel vapor levels will be monitored using an LEL meter The presence of underground utilities are also of concern, and Underground Service Alert will be notified in advance of any drilling work for identification of all underground utilities in the immediate area Sampling -Use of personal protective equipment will minimize the potential for exposure of personnel conducting site investigation activities Heat stress will be monitored by each individual and controlled through regular work breaks as outlined in the American Conference of Governmental Industrial Hygienists' TLVs for heat stress conditions 2. EXPOSURE MONITORING PLAN Potential exposure hazards found at UST sites primarily include toxic airborne vapors from leaking USTs The most dangerous airborne vapor likely to be encountered during a UST investigation is benzene Gasoline vapor concentration levels will be monitored in the breathing zone with a PID calibrated to benzene When the action level of 150 ppm (one half the TLV of gasoline) is detected in the breathing zone, respiratory protection will be required utilizing full-face or half-face respirators with organic vapor cartridges Monitoring for combustible gases will also be performed using an LEL meter when vapor concentrations above 2,000 ppm are detected with the PID The action level is 35 percent of the LEL for gasoline vapors or 4,500 ppm If this level is attained or exceeded, the work party will be IMMEDIATELY withdrawn 0 Main\D\EnvironmentaMarmarTexaco\Workplan\042003 wpd 3