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Sampling Collection Method and Equipment The sampling method for asbestos in ambient air is National Institute for Occupational Safety and Health (NIOSH) Method 7402, Asbestos by Transmission Electron Microscopy O'L.,M), NIOSII Manual of Analytical Methods, Fourth Edition, 2004. The samples- will be collected over a nominal 8 -hour period. The asbestos air sampling procedure consists of drawing a known low volume of air through a mixed cellulose ester (MCF) filter. The filter is then sent to the laboratory for analysis. Shaw has selected Asbestos TEM Laboratories, Inc. (ATEM) as the laboratory for analysis under this project. ATEM is an accredited analytical laboratory for TEM analysis, NIOSH Method 7402 (direct method) will be used for determining the concentrations of asbestos in air. I lie f'ollowing table presents the monitoring equipment that will be installed at eaclistation. Description of Proposed Equipment Sampling Pump Asbestos Filter Cartridge prri -- micrometer Lmm�� Gillian Thomas Pump MCE Filter Specification Diaphragm Type Pore size 0,45 pin, with TEM filter cassette The sampling equipment consists of a sampling punip, filter cassette, connecting tubing, and a rotameter. The filter will be a three-piece cassette 25 millimeters in diameter, with conductive I extension cowls. 'flie cassette will be loaded with -,in MCF filter of 0.45 pin pore size. 'the filter will be backed by a 5 pm pore size NICE filter. A sample rate of I to 4 liters per I'llinute for a duration of 8 hours will be maintained. 3.3 Equipment Calibration The sampling pump will be calibrated immediately before and after each run. Preliminary calibration should be conducted using it primary calibrator such as a soap bubble -type -calibrator, with a representative filter cassette (from the same cassette lot as the sample cassettes)- Three separate constant flow calibration readings will be obtained both before and after sampling. Should the flow rate change by more than 5 percent during the sampling period. the average of the pre- and post -calibration rates will be used to calculate the total sample volume.