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TASK HAZARD ANALYSIS (THA) <br />EAR IFIfteNNIn T ECH SUBSURFACE INVESTIGATION <br />JCC/AOC RFP 208: POTENTIAL NEW COURT SITE A two INTERNATIONAL LTD. COMPANY <br />STOCKTON, CA <br />Evaluated by: Richard Burzinski Date: January 2009 <br />MONITORING PROCEDURES <br />Parameter <br />Zone Location and <br />Monitoring Interval <br />Response Level <br />(Above Background) Response Activity <br />VOCs <br />(total by PID) <br />Breathing Zone, <br />every 30 minutes <br />during drilling <br />activities <br /><10 units Continue work in required PPE and continue <br />monitoring. <br />10-25 units (sustained for <br />more than 5 minutes) <br />Continue work in required PPE, continue <br />monitoring, and use benzene detector tubes. <br />25-100 units (sustained for <br />more than 5 minutes) <br />Contact the SSO, implement mitigation <br />measures, upgrade PPE to Level C (organic <br />vapor cartridge). <br />> 100 units (sustained for <br />more than 5 minutes) <br />Cease work, exit, and contact the Safety <br />Professional and Project Manager. <br />Benzene <br />(by Colorimetric <br />Tube) <br />Breathing zone, <br />where indicated by <br />VOC readings <br />No color change Continue work activities. <br />Any color change to 10 <br />ppm <br />Contact the SSO, implement mitigation <br />measures, upgrade PPE to Level C (organic <br />vapor cartridge). <br />> 10 ppm Cease work, exit the area, and contact the SSO <br />and Project Manager. —