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Health and Safety Plan, Subsurface Investigation <br />Potential New Court Site, Stockton, California <br />TABLE 1 <br />ACTION LEVELS — DIRECT PUSH TECHNIQUE DRILLING <br />Parameter <br />Zone Location <br />and Monitoring <br />Interval <br />Response Level <br />(Above Background) Response Activity <br />VOCs <br />(total by PIP) <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 <br />for more than 5 <br />minutes) <br />Continue work in required PPE, continue <br />monitoring, and use benzene detector tubes. <br />25-100 units (sustained <br />for more than 5 <br />minutes) <br />Contact the SSO, implement mitigation <br />measures, upgrade PPE to Level C (organic <br />vapor cartridge). <br />> 100 units (sustained <br />for more than 5 <br />minutes) <br />Cease work, exit, and contact the Safety <br />Professional and Project Manager. <br />Benzene <br />(bY <br />Colorimetric <br />Tube) <br />Breathing zone, <br />where indicated <br />by 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. <br />Note: <br />All VOC monitoring will be conducted using PID only. <br />Project 104290.19.01 27 January 2009