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> 2 ppm above background, sustained for five minutes. <br /> > 5 ppm above background, sustained for one minute. <br /> • The detection of readings above background at the borehole/pit shall <br /> be noted in the sampling log as evidence of environmental <br /> contamination, but only breathing zone PID measurements shall be <br /> used for establishing respiratory protection criteria. <br /> • Visible dust release (for example, during drill or when <br /> jackhammering concrete). Alternate NIOSH-approved dust <br /> respirators may be substituted for full face air purifying respirators <br /> with specific approval by the FSS. <br /> • The detection of chemical odors arising from boreholes. <br /> • Once Level C protection is initiated, it will continue to be worn <br /> until the triggering condition returns to background levels. <br /> • The term "verified" is used to indicate measurements that are <br /> confirmed by one or more of the following: <br /> (1) Detection of the contaminant using more than one instrument <br /> (i.e., verification by detector tubes, OVA, etc.) <br /> (2) Repeatable measurements - for example, if the PID indicates <br /> a reading above background, the meter should be moved <br /> upwind of the operation. If the reading falls and rises again <br /> upon returning the instrument to the original location, the <br /> initial measurement may be considered "verified". <br /> (3) If the meter response is not attributable to the borehole or <br /> excavated material, the meter should be checked for drift. <br /> If circumstances suggest a vapor source not related to the <br /> sampling process, the FSS should be immediately contacted <br /> for evaluation. <br /> 8.3 Additional Protective Equipment <br /> American National Standard Institute (ANSI) approved safety glasses with side <br /> shields shall be required during chip-producing operations, such as <br /> drilling/jackhammering through concrete. <br /> Splash-proof chemical goggles shall be mandated by the FSS for operations <br /> presenting splash or splatter potential, such as vehicle decontamination or wet <br /> Santochi&Bravante LLC American Savings Bank <br /> 20 Corporate Plaza 9620-041-1 <br /> Newport Beach,California 14 222 El Dorado <br />