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Locate emergency telephone numbers and route to hospital prior to starting any work. Notify site manager of your presence at the site and your field plans. Prior to work on- site, a safety briefing will be conducted with all sub -contractors working in the area. This shall include informing them of the hazards associated with site work, and all chemicals anticipated. For drilling or excavating - Position equipment and contractor upwind of the area to be excavated. Inspect exclusion zone for spark sources, paying careful attention to electrical equipment. Do not start excavation or boring work until all possible sources of ignition have been removed. Secure the area to prevent the public from approaching within 25 feet of any sampling, digging, or drilling. Work Limitation: - No eating, drinking, or SMOKING within 50 feet of the work area. No facial hair that would interfere with respirator fit. Level C is not to be used without two fully trained staff onsite. if breathing zone air monitoring results indicate organic vapors greater than 25 ppm, up -grade to level C is required. If breathing zone air monitoring results indicate organic vapors greater than 100 ppm, work must be suspended until the breathing zone air monitoring indicates conditions returned to levels appropriate for Level C or D. Stress breaks are to be taken at regular intervals of 2 hours, or more frequently, if necessary. No sparks or ignition sources within 50 feet of work area. IV. Chemical Hazards Soil or groundwater in contaminated areas may contain concentrations of benzene, toluene, ethyl benzene, xylenes, MTBE, naphthalene, methylnaphthalene and heavy metals. Benzene is a potential human carcinogen. Routes of Exposure: Benzene, toluene and xylenes are volatile organic compounds and can be absorbed by the body via inhalation, ingestion, contact and absorption. Ethylbenzene can be absorbed by the body via inhalation, ingestion and contact. c:NAo1scWsnxrnviasp.looc -10-