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• The detection of gaseous contaminants that cannot be removed by the Level <br /> C respirator at levels above 50% of the OSHA PEL as measured at the <br /> breathing zone via detector tubes. Example: H2S, HCN, mercury vapor. <br /> EXCEPTION: Carbon monoxide - see below. <br /> • Carbon monoxide (CO) levels in excess of the following levels <br /> (measurements via detector tubes may be used for the following <br /> determinations): <br /> a) In excess of 50 ppm for periods exceeding 15 minutes (breathing <br /> zone). <br /> b) In excess of 15 ppm for 30 minutes (breathing zone). <br /> 9.3 Air Sampling Protocol <br /> Previous environmental investigations indicate the possibility of volatile organic <br /> compounds, such as petroleum hydrocarbons and BTEX. In the event air <br /> monitoring with a combination oxygen/combustible gas meter becomes appropriate, <br /> alarms shall be set at 19.5% oxygen, 25% LEL. The meter is to be set up with an <br /> extension probe or a length of Tygon tubing to allow sample to be drawn <br /> immediately adjacent to borehole. <br /> • The following air/physical monitoring shall. be conducted when the <br /> exclusion zones are occupied. When more than one exclusion zone exists <br /> at the same time (not anticipated), spot readings at all occupied exclusion <br /> areas shall be performed on a rotating basis. <br /> • PID readings: Organic vapor monitoring shall be performed at the <br /> breathing zone and boreholes every 10 feet of drilling Results shall be <br /> logged on the Site Monitoring Log located in Appendix F. <br /> • Personal sampling for metals, organic vapors, etc. may be required at the <br /> discretion of the FSS. <br /> 9.4 Equipment Calibration and Maintenance <br /> Oxygen/Combustible gas meters shall be calibrated daily against a cylinder of <br /> calibration gas of a suitable concentration, such as 25% LEL. <br /> The PID shall be calibrated daily against isobutylene span gas and "zeroed" against <br /> organic-free zero air. Background levels measured at the site shall be noted daily, <br /> and used daily, as a baseline for detecting excursions during monitoring. <br /> Santochi&Bravante LLC American Savings Bank <br /> 20 Corporate Plaza 9620-041-1 <br /> Newport Beach,California' ]$ 222 El Dorado <br />