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r <br /> . • Carbon monoxide (CO) levels in excess of the following levels <br /> (measurements via detector tubes may be used for the following <br /> r 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 /> 9.2 Air Sampling Protocol <br /> Previous environmental investigations indicate the possibility of VOCs III the <br /> 1 work area The following air/physical monitoring shall be conducted when the <br /> exclusion zones are occupied When more than one exclusion zone exists at <br /> the same time (not anticipated), spot readings at all occupied exclusion areas <br /> 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 maybe required at the <br /> discretion of the FSS <br /> 9.3 Equipment Calibration and Maintenance <br /> Oxygen/Combustible gas meters shall be calibrated daily prix: to the ,tart o[ <br /> i work The gas meters will be calibrated to the pentane ,tandard per <br /> r-nanufactusers in,,tructI0I1S <br /> The PID shall be calibrated daily against isobutylene span gas and "zeroed" <br /> against organic-free zero air Background levels measured at the site shall be <br /> noted daily, and used daily, as a baseline for detecting excursions during <br /> monitoring <br /> All instruments shall be charged and maintained as specified in their respective <br /> instrument manuals. This will be the responsibility of the FSS <br /> 9.4 Documentation <br /> The Site Monitoring Log (Appendix F) shall be used to document all air <br /> ML Avalon Environmental Consultants 9627-001-7 <br /> Kashmar Singh Joes Truck Plaza <br /> February 1, 2002 16 Lathrop, California <br />