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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 volitule organic <br /> compounds such as BTEX and petroleum hydrocarbons. In the event air monitoring <br /> with a combination oxygen/combustible gas meter becomes appropriate, alarms shall <br /> be set at 19.5% oxygen, 25% LEL. The meter is to be set up with an extension probe <br /> or a length of Tygon tubing to allow sample to be drawn immediately adjacent to <br /> borehole. <br /> • The following air/physical monitoring shall be conducted when the exclusion <br /> zones are occupied. When more than one exclusion zone exists at the same <br /> time (not anticipated), spot readings at all occupied exclusion areas shall be <br /> performed on a rotating basis. <br /> • PID readings: Organic vapor monitoring shall be performed at the breathing <br /> zone and boreholes at every boring after the initial, 15 foot, and bottom <br /> samples have been collected. Results shall be logged on the site Monitoring <br /> Log located in Appendix F. <br /> • Personal sampling for metals, organic vapors, etc. may be required at the <br /> discretion of the FSS. <br /> 9.3 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, and <br /> used daily, as a baseline for detecting excursions during 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 monitoring <br /> data. This log shall be used to record the following: <br /> • Instrument calibrations <br /> CRC Environmental Risk Management,Inc. Project No. 2100-217-2 <br /> American Savings Bank 150 West 10th Street <br /> February 15. 1995 20 Tracy,California <br />