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Cgador Barth Technologies, Inc. <br /> Health and Safety <br />' Page -3 of 4- <br /> 1 <br /> i <br /> D. BOREHOLE MONITORING/RESPIRATOR REQUIREMENTS <br /> II. Breathing zone vapor at detectable concentrations at the borehole, <br /> as detected by an OVA, requires site personnel to use a respirator <br />' with organic vapor cartridges and goggles while working in the <br /> exclusion zone. <br /> 2. Breathing zone vapor at detectable concentrations at the borehole <br /> requires site manager to monitor site perimeter (concentrating in <br /> the down wind direction). <br /> 3. Breathing zone vapor concentrations that reach or exceed a value of <br /> 100/c of the Permissible Exposure Limit (PEL) at the borehole <br /> require site activities to be stopped until concentrations decrease. <br /> Site manager should continuously monitor site perimeter. <br /> Monitor Wells <br /> 632 S. El Dorado Street, Stockton <br /> [Benzene] <br /> [PEL = 1 ppm; 10% = 0.1 ppm] <br /> E. SITE PERIMETER MONITORING/REGULATORY AGENCY <br /> NOTIFICATION <br /> 4. If breathing zone vapor concentrations at the site perimeter are less <br /> than OVA detectable PEL, the site manager shall monitor on 30 <br /> minute intervals unless notified by project personnel of elevated <br /> concentrations. <br /> S. If breathing zone val gr concentrations at the site per reach <br /> f or exceed a value of 10% of the PEL, as detected by the OVA, the <br />■ site manager shall continuously monitor conditions on the site <br /> boundary concentrating in the down wind direction. <br /> 6. If the vapor concentrations continue to reach or exceed eed a value of <br /> 10°!0 of the PEL, at the site Wrimeter for 15 minutes drilling <br /> activities shall be stopped. Appropriate regulatory agencies should <br /> be contacted (see below). Site manager shall continue to monitor <br /> conditions until levels are reduced to background concentrations. <br /> LMA\H&Sdocs\H&SCET.N93 <br /> 1 <br />