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LEVEL MEASURED BY ACTION <br /> CALIBRATED OVA <br /> <10 ppm Continue OVA monitoring at s ecified frequency and duration <br /> Level Measured by Benzene Action <br /> Draeger Tube Test <br /> <1 ppm Respirators not required <br /> 10 ppm-24 ppm <br /> >1 ppm Respirators required <br /> 25 ppm-99 ppm Respirators required. <br /> 100 ppm or greater Stop work personnel move out of area, contact Project Manager. <br /> More stringent respiratory protection may be required. <br /> Project No.58475-06-70 -17- April 25,2003 <br />