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* Since flammable or combustible vapors are likely to be <br /> present all potential sources of ignition must be <br /> eliminated . Caution must be taken to prevent the <br /> discharge of static electricity and to prevent <br /> accumulations of vapor at ground level . A combustible <br /> gas indicator should be used continuously to check <br /> hazardous vapor concentrations and lower explosive limits <br /> (LEL) . The alarm of the combustible gas indicator should <br /> be set at 20% of LEL . Under Alarm conditions , all work <br /> activities will cease and the area will be evacuated <br /> until the combustible vapor concentration can be <br /> controlled below 20% of the LEL . All open flame or <br /> spark-producing equipment in the area should be shut down <br /> and any electrical equipment used must be explosion <br /> proof . <br /> In case of fire : <br /> * Extinguish with dry chemical , foam, or carbon dioxide. <br /> * If fire cannot be extinguished within 30 SECONDS , call <br /> the fire department immediately . <br /> * Water may be ineffective on fire . <br /> 4 . 0 RISK ASSESSMENT SUMMARY <br /> 4 . 1 TO OTHER WORKERS <br /> The hazards applicable to ancillary workers will be <br /> evaluated by the job site Foreman each day . <br /> 4 . 2 TO THE ENVIRONMENT <br /> Hazards to the environment deal primarily with the risk of <br /> contaminant expansion . <br /> 4. 3 TO THE PUBLIC <br /> Due to security measures preventing public access , and <br /> because the age and nature of the contaminants make the <br /> chance of danger beyond the work zone negligible, there is <br /> a low level of risk to the public in the scope of this <br /> project . <br /> Page - 8 <br />