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October 16, 1995 UEC Document No.: R -1659510A UEC Job No.: 165040-9510C 3.1 Area Air Sample Collection 3.1.1 Area Air Sample Collection Protocol The following guidelines, derived from modifying 40 CFR Part 763 AHERA Protocol (October 30, 1987), will be followed during the collection of area air samples: 1. UEC principals and consultants are independent of the asbestos abatement contractor as to avoid possible conflict of interest. 2. All sampling equipment will be thoroughly cleaned before each use. 3. Commercially available sampling cassettes suitable for asbestos, tremolite, anthophyllite, and actinolite counting will be used for sampling airborne matter throughout the abatement activities. The collection medium will be a mixed cellulose ester filter membrane. 4. The cassette to be used is 25 -mm in diameter with an open-faced 50 -mm electrically conductive extension cowl. An air flow rate between 1.0 and 10.0 liters/minute will be selected for the 25 -mm cassette. Where possible, a sample time will be chosen which produces a collection air volume between 1,200 and 1,800 liters. If the filter appears darkened in appearance or if loose dust is seen on the filter, a new sample will be started. 5. The cassette will be suspended from a stand that is five feet high (located in the breathing zone), and separate from the pump and connected with flexible tubing to prevent vibration of the cassette and possible loss of fibers from the filter. 6. The sampling cassette will be oriented 45 degrees downward from a horizontal plane to minimize the chance of large particles falling directly onto the filter. 7. Prior to calibration and sampling , all pumps will be checked for leaks. 8. All sampling pumps and flow meters will be calibrated with a recognized standard; calibration data is to be recorded and maintained on site by UEC personnel prior to initiating sampling and following sampling for each cassette. All sample flow rates will be approximately 10 liters/minute. 9. Pump operation will be monitored periodically during sampling to identify and rectify pump action fluctuations, undesirable mechanical vibrations and leaks in the sampling train. 10. When sampling is complete, the cassette will be turned upward, the pump turned off, the filter cap replaced, and the sample removed from the sampling train. 11. Sample cassettes will be individually sealed and transported to the laboratory in a rigid container with the chain of custody form. Styrofoam packing material will not be used. 12. Daily work shift logs documenting all pertinent sampling activities will be maintained on site by' UEC personnel. 13. Air sampling will be conducted at strategic locations outside the work area; sample results will be made available prior to the next work shift such that engineering controls, when needed, could be assessed and implemented. A fiber concentration of 0.01 f/cc or baseline airborne fiber concentrations (whichever is higher) outside the work area is the goal for this project. A