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r� -- <br /> I <br /> rim breathing zone PID measurements shall be used for establishing respiratory <br /> protection criteria. <br /> • Visible dust release (for example, during drill or when jackhammering <br /> concrete). Alternate NIOSH-approved dust respirators may be substituted for <br /> full face air purifying respirators 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 until the <br /> triggering condition returns to background levels. <br /> '' • The term "verified" is used to indicate measurements that are confirmed by <br /> one or more of the following: <br /> ' (1) Detection of the contaminant usingmore than one instrument i.e. <br /> ( , <br /> verification by detector tubes, OVA, etc.) <br /> ' 2 eatable measurements - for example, if the PID <br /> ( ) Repeatable p indicates a reading <br /> above background, the meter should be moved upwind of the <br /> operation. If the reading falls and rises again upon returning the <br /> instrument to the original location, the initial measurement may be <br /> considered "verified". <br /> i <br /> (3) If the meter response is not attributable to the borehole or excavated <br /> ' material, the meter should be checked for drift. If circumstances <br /> suggest a vapor source not related to the sampling process, the FSS <br /> should be immediately contacted for evaluation. <br /> 8.4 Level B Protection <br /> ' The wearing of Level B (supplied air respirator protection) is not anticipated to be <br /> required in the course of this work. Should conditions require Level B equipment to <br /> perform work operations, an amendment to this HASP shall be prepared which <br /> ' includes standard operating procedures and training requirements for the use of this <br /> equipment. <br /> ' A self-contained breathing apparatus (SCBA) shall be used in the event circumstances <br /> require entry into an area where air contamination potential exceeds the criteria for <br /> safe use of Level C respirators. This equipment shall be used only by trained <br /> ' individuals, and an SCBA-trained and equipped standby person must be present any <br /> time an activity takes place which requires the use of an SCBA. <br /> 16, <br /> i' CRC Environmental Risk Management,Inc. Project N2140-250-2 <br /> American Savings Bank 232 North EI Dorado Street <br /> April 6, 1993 17 Stockton,California <br /> kaAa - -- - - - - — - - _ <br />