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If <br /> } <br /> } <br /> 4 Project No.034-98081 <br /> Page No. 17 ` <br /> 8.0 MONITORING PROGRAM <br /> Personal exposure to ambient levels of airborne hazards and noise will be monitored and/or observed <br /> to insure that personnel exposures do not exceed acceptable limits and for the selection of protective <br /> equipment. Personal monitoring will be randomly performed using personal air pumps and appropriate <br /> sampling tubes. Previous data from similar jobs may be used to determine PPE levels. On all jobs, airborne <br /> ' I <br /> contamination and downhole hydrocarbon vapor concentrations will be measured primarily by the use of a J <br /> direct reading instrument such as a photo ionization detector. If concentrations approach established levels, <br /> Drager® detector tubes will be used to determine the presence and concentration of benzene. Site <br /> visits/inspections may be conducted by the Krazan & Associates Safety Officer to insure compliance with <br /> this plan. <br /> rt <br /> 8.1 Photoionization Detector <br /> During this investigation, the ambient air, drilling returns, soil samples, and boreholes will be <br /> screened with a calibrated H-nu®brand,portable photoionization detector(PID). The PID is a direct reading <br /> f <br /> real-time analyzer that is capable of detecting most of the volatile hydrocarbons constituents present in a <br /> { vapor phase. The PID to be used for this investigation uses a 10.2 electron volt lamp and is calibrated using i <br /> I <br /> an iso-butylene calibration gas. Iso-butylene:is a relatively safe calibration gas similar in ionization potential <br /> to benzene(the carcinogen of primary concern present in petroleum products).. <br /> 8.2 Drager®Detector Tubes <br /> Drager®detector tubes will be used to determine airborne concentrations of benzene in the breathing <br /> i ; <br /> zone during this investigation. A member of the field team will take detector tube readings if high PID <br /> f <br /> measurements so warrant. <br /> 4 i <br /> Readings will be taken in the area where the field team members are working. Drager®#672$561 <br /> i <br /> benzene detector tubes will be used (measurement range 0.5-10 ppmv). The detector tube pump will be <br /> inspected for proper operation prior to field operations. <br /> 1 <br /> �y <br /> t <br /> t <br /> Q i . <br /> � y <br /> F <br /> 4. <br /> KRAZAN & ASSOCIATES,INC. <br /> �+ Offices Serving the Western United States <br />, <br />