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> 5 ppm above background, sustained for one minute. • The detection of readings above background at the borehole/pit shall be noted in the sampling log as evidence of environmental contamination, but only breathing zone PID measurements shall be used for establishing respiratory protection criteria. • Visible dust release (for example, during drill or when jackhammering concrete). Alternate NIOSH-approved dust respirators may be substituted for full face air purifying respirators with specific approval by the FSS. • The detection of chemical odors arising from boreholes. • Once Level C protection is initiated, it will continue to be worn until the triggering condition returns to background levels. • The term "verified" is used to indicate measurements that are confirmed by one or more of the following: (1) Detection of the contaminant using more than one instrument (i.e., verification by detector tubes, OVA, etc.) (2) Repeatable measurements - for example, if the PID indicates a reading above background, the meter should be moved upwind of the operation. If the reading falls and rises again upon returning the instrument to the original location, the initial measurement may be considered "verified". (3) If the meter response is not attributable to the borehole or excavated material, the meter should be checked for drift. If circumstances suggest a vapor source not related to the sampling process, the FSS should be immediately contacted for evaluation. 8.4 Level B Protection The wearing of Level B (supplied air respirator protection) is not anticipated to be required in the course of this work. Should conditions require Level B equipment to perform work operations, an amendment to this HASP shall be prepared which includes standard operating procedures and training requirements for the use of this equipment. A self-contained breathing apparatus (SCBA) shall be used in the event circumstances require entry into an area where air contamination potential exceeds the criteria for safe use of Level C respirators. This equipment shall be used only by trained individuals, and an SCBA-trained and equipped standby person must be present any time an activity takes place which requires the use of an SCBA. CRC Environmental Risk Management.Inc. Project No.2100-217-2 American Savings Bank 150 West 10th Street February 15, 1995 17 Tracy, California