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r - 2. EXPOSURE MONITORING PLAN Potential exposure hazards found at UST sites primarily include toxic airborne vapors from leaking UST's. 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 PPMV(one half the T.V.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 LED meter when vapor concentrations above 2,000 ppmv are detected with the PID. The action level is 35 percent of the LED for gasoline vapors or 4,500 pPMV. If this level is attained or exceeded,the work party will I be IMMEDIATELY withdrawn. 3. PERSONAL PROTECTIVE EQUIPMENT The level of protection during the site investigation will usually be level "D."Level D protective equipment includes coveralls, safety boots, safety glasses,gloves, and hard hats if drilling or trenching operations are in progress. I Upgrading the protection level would be based on airborne benzene concentration levels equal to or exceeding the action level. An upgrade to level "C"protection would be required if the action level is equaled or exceeded. Additional equipment required for level C would be a full-face or half-face air purifying canister-equipped respirator and Tyvek suits with taped arm and leg seals.. If the action level is met or exceeded(35 percent)for the LED, work will cease until the vapor level is measured to be below 20 percent of the LED. A fire extinguisher,will be maintained on site. Decisions for workers'safety are based on a continual evaluation of existing or changing conditions. I i �I M ainW\Enviro¢mcolal4lSTE 4W orkp Ian1W orkplan l 1142007.wpd