NYC-WTC_000229688

NYC 9/11 Public Portal Document

JftN-22-2002 1 09:51 OSEP UNIT «1. 7345 202 324 9235 P.14/43 Industrial Hygiene Survey Federal Bureau of Investigation, Staten Island, NY

results usually confirm the presence of asbestos fibers. In one case, on October 23,2001, an air sample analyzed by PCM revealed 0.488 and the follow-up TEM analysis 0.106 ft fZcc, 5. Exposure monitoring of eight (8) workers manually raking out debris in an open area was done on 51 workers and reveled levels ranging 6om 0.004 to 0.417 f/cc. The average exposure level was 0.08 f^cc. 6. Exposure monitoring of workers while manually raking debris in an enclosed area was done on 12/5/01. Four personal samples wer and ranged from 0.074 to 0.092. This suggests that the enclosures do not significaE^ increase exposure levels. 7. Exposure monitoring of workers while inspecting debris at a screener was done on 11/9701 and 11/14/01. On both days the screener was not enclosed, but was in the open air. The results ranged from 0.051 to 0.251 f/cc. The average level was 0.143 f/cc. 8. Personal sampling was conducted on a FBI bomb technician while working throughout the day searching cars removed from the WTC site. The exposure level was 0.303 f/cc. Additional analysis of the sample by TEM revealed an exposure level of 0.488 fZcc.

These findings indicate that workers should continue to wear the half face respiratory protection currently issued while working in the debris field. Tyvek suits and gloves should also be used. The results indicate that exposures to asbestos can exceed the PEL as much as 30 % of the time. When the PEL is exceeded it is usually by a very small margin and never approaches the maximum allowable limit for a half face respirator.

Metals in Air Samples Both persona] and area sampling was conducted for metals in air. The results of metal scans were summarized in the prior report. Additional sampling for metal scans has not been conducted since the earlier report Additional sampling was conducted for lead exposure. For the total metal scans, four personal samples were collected on workers in the debris field and one area sample was collected. Only five metals were detected in the samples. These include aluminum, calcium, magnesium, barium, and manganese. The levels of each of the metals scanned were well below the OSHA PEL. The levels of metals measured are summarized below:

Metal OSHAPEL Level Detected M

Silver O.Ot mgZM3 <0.006 ng/Ma Aluminum 15 mg/M3 0.008 to 0.01 mg/M3 Arsenic 0.01 mg/M3 <0.2 mgZM3 Antimony 0,5mg/M3 <0.001 ing/M3 Barium 0.5mg/M3 <0.002 mg/Ma Beryllium 0.002 mg/M3 <0.0002 m£/m3 Cadmium 0,005 mgZM3 <0.0002 mg/MJ Cobalt 0.1 mgZM3 <0.002 mg/Ma Chromium Img/Ma <0.002 mg/MJ Copper lmg/M3 <0.004 mg/M3 I Iron 10mg/M3 <0.021 mg/M3 Lead 0.05 mg/M3 <0.0005 mgZma Magnesium 15 mg/MJ 0.012 mg/Ma Manganese 5 mg/MJ 0.0005 mg/Ma

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NYC-WTC_000229700