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minute intervals. If elevated concentrations are indicated, the monitoring frequency will be <br /> increased, as appropriate. If during ibis time, sustained measurements are observed, the <br /> following actions will be instituted, and the Project Manager and Director of Health and <br /> Safety will be notified. For purposes of this HSP, sustained readings are defined as the <br /> average airborne concentration maintained for a period of one (1) minute. <br /> Activity Action Level Level of Respiratory Protection <br /> Soil Sampling < 3 ppm above Level D: No respiratory protection <br /> background(VOCs) required. <br /> < 1.0 mg/m'above <br /> background(dusts) <br /> 3 to 15 ppm(VOCs) Level C: Half-or full-face air-purifying <br /> 1.0 to 2.5 mg/m'(dusts) respirator fitted with organic <br /> vapor/NEPA filter cartridges. <br /> > 15 ppm (VOCs) Cease operations and evacuate work <br /> >2.5 mg/m' (dusts) area. Contact Director of Health and <br /> Safety and Project Manager <br /> immediately. <br /> Note: mg/m' = milligrams per cubic meter <br />