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1 . MAJESTIC TECH <br /> For work area evaluations, reprensentative samples will be <br /> taken in the breathing zone in areas where employees are <br /> working. The results of measurements will be compared to an <br /> action level of 10 ppm. This action level is based on the <br /> PEL for Tetrachloroetnylene of 25 ppm. (WARNING - an <br /> action level of 0. 5 ppm shall be used in areas where benzene <br /> contamination has been Identified and evaluated using color <br /> indicating tubes. See 8. 2. 3 above) . Airborne <br /> concentrations above the action level shall require the use <br /> of Level C protection. For work situations where the levels <br /> are changing (i. e. . fluctuating) , Level C protection shall <br /> be Implemented. <br /> If airborne concentrations exceeding the following values <br /> are detected, operations shall stop and the work area <br /> excavated; <br /> >10. 0 ppm if benezene is present (based on ten times <br /> the PEL, assuming use of a half-face air purifying <br /> respirator. <br /> >50 . 0 Bpm if tetrachloroethylene is present , and any <br /> detectable benzene is <10. 0 ppm (based on two times the <br /> PEL for tetrachloroethylene, assuming the use of a <br /> half-face air purifying respirator) . <br /> >20C. 0 ppm if benzene and tetrachloroethylene are below <br /> the concentrations listed above ( based on two times the <br /> TLV for toluene and two times the PEL for ethyl <br /> benzene, xylene, and naptha) . <br /> See the Exposure Monitoring Action table below. <br /> For soil characterization , an approriate soil sample shall <br /> be obtained by a backhoe and brought to a position at least <br /> twenty feet away from any open excavation. The SHO, using <br /> chemical protective gloves (see 11. 2 below) , shall uncover <br /> fresh soil within the sample (i. e. , within the bucket ) and <br /> immediately place the OVA instrument probe as close as <br /> possible to the exposed soil WITHOUT directly contaminating <br /> the instrument. For each soil sample, multiple measurements <br /> ( at least three feet ) , each from freshly exposed soil, shall <br /> be taken. Each measurement shall be taken for at least 10 <br /> to 20 seconds . and the highest observed value taken as the <br /> measurement result. <br /> 10. 2. 3 TOXIC CONSTITUENTS! <br /> when the presence of benzene or tetrachloroethylene is <br /> suspected, the atnosphere shall be monitored using color <br /> indicator tubes (i . e. . Drager Benzene . 5/a and <br /> Perchloroethylene 10/b tubes or equivalent ) . Grab samples <br /> shall be taken in the breethPng zone of workers where <br /> operations are being performed. At least three <br /> represenative samples shall be taken each time either of <br /> these ConstituentB is being evaluated. Additonal samples <br />