Notice regarding elevated occupational exposure levels to quartz, asbestos, and other agents at the World Trade Center site in late 2001.
NYC-WTC_000186529–000186530
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
LIBERTY MUTUAL
Industrial Hygiene Air Sample Results Summary for Weeks of 12/21/01 toOl/04/02
Attached is a summary of the results of the samples collected by ATC associates at the World Trade Center site for the specified week.
The vast majority of the samples collected by ATC are “personal samples”, meaning that the worker wore the sampling device. The vast majority of results have shown exposure levels to be below occupational exposure limits. The exceptions were;
An ozone concentration of 2.38 times the TLV on a torch cutter on the surface east of WTC 5 A sulfuric acid concentration of 1.18 times the TLV on torch cutter in the WTC 1 depression A quartz concentration of 6.8 times the TLV on a jackhammer operator in the cable pit An asbestos concentration of 100% of the TLV on a grappler operator in the vicinity of the Bankers Trust building
Some of the columns in the attached summary may require explanation:
Analyte Class - This column includes general category of the agents (substances) which were sampled.
# of Samples - This indicates how many individual samples were collected fc.’ the agent class listed.
# of Analytes - This is the number of individual analysis performed. If only one analyze is determined on each sample, then the number of analytes will equal the number of samples. However, most samples are analyzed for more than one agent as follows;
Metals: Aluminum, antimony, arsenic, barium, beryllium, cadmium, calcium, chromium, cobalt, copper, iron, lead, magnesium, manganese, nickel, selenium, silver, thallium, tin, titanium, vanadium, and zinc. Metal samples are sometimes also analyzed for total particulate.
PAHs: Acenaphthene, acenaphthylene, anthracene, benz(a)anthracene, benz(b)fluoranthene, benzo{a)pyrene, benzo(ghi)perylene, benzo(k)fluoranthene, chrysene, dibenzo(a,h)anthracene, fluoranthene, fluorene, indeno{l,2,3-cd)pyrene, naphthalene, phenanthrene and pyrene.
Aromatics; Benzene, ethyl benzene, toluene, and xylene.
Silica: Respirable dust, quartz, and cristobalite.
Aldehydes; Acetaldehyde, acrolein, benzaldehyde, formaldehyde, n-butyraldchyde, propionaldehyde, and valeraldehyde.
Acids; Hydrobromic acid, hydrochloric acid, hydrofluoric acid, nitric acid, phosphoric acid and sulfuric acid
Highest Analyte - The analyte found in the highest concentration with respect to its occupational exposure limit.
Highest Result - The concentration of the highest analyte.
CITY_21MC100_003130709
NYC-WTC_000186529
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NYC-WTC_000186468
Summary report of air monitoring results including lead and quartz concentrations for workers at the World Trade Center site.
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NYC-WTC_000186468
Summary report of air monitoring results including lead and quartz concentrations for workers at the World Trade Center site.
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NYC-WTC_000186468
Summary report of air monitoring results including lead and quartz concentrations for workers at the World Trade Center site.
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