Memo on vehicle release from Ground Zero, Jan 2002

NYC 9/11 Public Portal Document

JRN-22-2002 1 09:51 OSEP UNIT RM. 7345 202 324 9235 P.14X43 Industrial Hy^eneSur^ 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 arid the follow-up TEM analysis 0.106 fZcc. I 5. Exposure monitoring of eight (8) workers manually raking out debris in an open area was done on 51 workers and revealed levels ranging &om 0.004 to 0.417 f/cc. The average exposure level was 0.08 Fee. 6. Exposure monitoring of workers while manua^raking debris in an enclosed area was done on 12/5/01. Four personal samples we^^^ted and ranged from 0.074 to 0.092. This suggests that the enclosures do not signifi^^mcrease exposure levels. 7. Exposure monitoring of workers while inspecting debris at a screener was done on 11/9/01 and 11/14/01. On both days the screener was not enclosed, but was in the open 1 air. The results ranged fiom 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 Fee. Additional analysis of the sample by TEM revealed an exposure level of0.488 Fee.

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 personal 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 Silver 0.01 mgZM3 <0.006 mg/MS Aluminum 15mg/M3 0.008 to 0.01 mgZM3 Arsenic 0.01 mg/NO <02 mg/M3 Antimony 0,5mg/M3 <0.001 mgfl43 Barium 0.Smg/M3 <0.002 mg/M3 Beryllium 0.002 mg/M3 <0.0002 nig/iii3 Cainium 0.005 ingZM3 <0.0002 mB/M3 Cobalt 0.1 mg/M3 <0.002 oig/M3 Chromium lms/M3 <0.002 mg/M3 Copper 1 mg/M3 <0.004 ing/M3 I Iron 10nig/M3 <0.021 mgZM3 Lead 0.05 mg/M3 <0.0005 Magnesium 15 mg/M3 0.012 mg/Ma Manganese 5ing/M3 0.0005 ng/M3

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