Asbestos air and dust test results, BMCC, Feb 2002

NYC 9/11 Public Portal Document

Table 1 Respirable Dust & Silica Air Sampling(January 26",2002) Sample No. Location Respirable Dust Respirable Silica RS-01 Trailer # 101 <0.004 m <0.0100 m RS-02 Trailer # 103 <0.004 m <0.0100 m RS-03 Trailer # 105 <0.004 m <0.0100 mg/m3 RS-04 Trailer # 107 0.0533 mg/m3 0.0149 m3 RS-05 Trailer # 109 <0.004 m 0.0236 m RS-06 Trailer # 111 1.1489 m <0.0100 m RS-07 Outside Trailer # 101— West side 1.0133 m <0.0100 In RS-FBL-1 Field Blank 1 Not detected <0.0100 mg/m3

Air Sampling for Total Dust

PSI collected 7 representative air samples on January 26th, 2002, one from each of six of the Trailers and one from a nearby outside area. Samples were collected and analyzed by NIOSH Method 0500 to determine ambient or background airborne total dust concentrations. Total dust concentrations ranged from <0.004 mg/m3 to 0.759 mg/m3 which are below the OSHA limit of 15 mg/m3 and the ACGIH limit of 10 mg/m3. Analytical results are shown below in Table 2.

Table 2 Total Dust Air Sampling (January 26`", 2002) Sample No. Location Total Dust TD-01 Trailer # 101 0.759 mg/m3 TD-02 Trailer # 103 0.130 mg/m3 TD-03 Trailer # 105 0.083 mg/m3 TD-04 Trailer # 107 <0.004 mg/m3 TD-05 Trailer #109 0.022 m TD-06 Trailer #111 <0.004 m TD-07 Outside Trailer # 101— West side 0.077 m TD-FBL-1 Field Blank 1 Not detected

Volatile Organic Compounds (VOC's)

Measurement of total VOC's is used to determine general quality of air associated with the level of volatile organic compounds. 25 samples for volatile organic compounds were collected with a MINIRAE 2000, direct reading photoionization detector on January 26th, 2002. Samples were collected within the North Building, the South Building and Trailers. Outside air background samples were also collected. The Indoor Air Quality Association (Standard IAQA #95-1) recommends levels be at or below 3.0 ppm for acceptable indoor air quality. Momentary spikes above 3 ppm related to janitorial operations are considered acceptable. The data indicated that total VOC's were not detected in 23 of the areas sampled. VOC's were detected in 2 of the samples, however at a concentration of 0.1 ppm the levels are well below the IAQA guideline. Please refer to Table 3 for measured results.

NYC-WTC 000106390