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z - <br /> Community Protection <br /> To assure the community is protected from health and fire <br /> hazards , up wind and down wind vapor monitoring will be <br /> performed if the general work area has hydrocarbon levels <br /> exceeding 100 ppmv . If down wind monitoring indicates <br /> persistent levels of 30 ppmv at the perimeter of the work area, <br /> work will be shutdown and vapor control efforts will. be <br /> instituted until measurements indicate levels have dropped <br /> below 30 ppmv. An alternative approach of expanding the taped <br /> off area zone may be used to provide additional community <br /> protection. <br />