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. Level C respirator at levels above 50%4 of the OSHA PEL as measured at the breathing zone via detector tubes Example H2S, HCN, mercury vapor EXCEPTION Carbon monoxide - see below • Carbon monoxide (CO) levels in excess of the following levels (measurements via detector tubes may be used for the following determinations) a) In excess of 50 ppm for periods exceeding 15 minutes (breathing zone) b) In excess of 15 ppm for 30 minutes (breathing zone) 9.2 Air Sampling Protocol Previous environmental investigations indicate the possibility of VOCs in the work area The following air/physical monitoring shall be conducted when the exclusion zones are occupied When more than one exclusion zone exists at the same time (not anticipated), spot readings at all occupied exclusion areas shall be performed on a rotating basis • PID readings Organic vapor monitoring shall be performed at the breathing zone and boreholes every 10 feet of drilling Results shall be logged on the Site Monitoring Log located in Appendix F • Personal sampling for metals, organic vapors, etc maybe required at the discretion of the FSS 9.3 Equipment Calibration and Maintenance Oxygen/Combustible gas meters shall be calibrated daily prioi to the start of work The gas meters will be calibrated to the pentane standard per manufactuiers instruet10175 The PID shall be calibrated daily against isobutylene span gas and "zeroed" against organic-free zero air Background levels measured at the site shall be noted daily, and used daily, as a baseline for detecting excursions during monitoring All instruments shall be charged and maintained as specified in their respective instrument manuals This will be the responsibility of the FSS i Avalon Environmental Consultants 9627-001-2 Kashmar Singh Joes Truck Stop October 20, 1998 16 Lathrop, California