Summary report of air monitoring results including lead and quartz concentrations for workers at the World Trade Center site.
NYC-WTC_000186468–000186469
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
liberty Mutual.
Industrial Hygiene Air Sample Results Summary for Week of 11/25 to 12/1
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-
A lead concentration of 2.3 times the PEL on a grappler operator on 10/17 A quartz concentration of 5 times the PEL on a laborer during concrete demolition on 11/16 A quartz concentration of 1.5 times the PEL on concrete mixer operator on 11/19
Some of the columns in the attached summary may require explanation.
Agent Class - This column includes general category of the agents (substances) which were sampled.
# of Samples - This indicates how many individual samples were collected for 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, tm, titanium, vanadium, and zinc. Metal samples are sometimes also analyzed for total particulate.
PAHs: Acenaphthene, acenaphthylene, anthracene, benz(a)anthracene, benz(b)f1uoranthene, 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-butyraldehyde, propionaldehyde, and valeraldehyde.
Acids: Hydrobromic acid, hydrochlonc acid, hydrofluonc aad, nrtnc acid, phosphonc acid and sutfunc acid
Highest Analyte - The analyte found in the highest concentration with respect to its occupational exposure liifiit.
Highest Result - The concentration of the highest analyte.
CITY_21MC100_007036573
NYC-WTC_000186468
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NYC-WTC_000186529
Notice regarding elevated occupational exposure levels to quartz, asbestos, and other agents at the World Trade Center site in late 2001.
17 shared non-person entities · 1 shared topics · similarity 0.995
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.988
machine-extracted · confidence unavailable · Check page ↗17 shared non-person entities · 1 shared topics · similarity 0.975
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machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.968
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machine-extracted · confidence unavailable · Check page ↗11 shared non-person entities · 1 shared topics · similarity 0.968
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.968
machine-extracted · confidence unavailable · Check page ↗13 shared non-person entities · 1 shared topics · similarity 0.987
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machine-extracted · confidence unavailable · Check page ↗1 shared non-person entities · 1 shared topics · similarity 0.969
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NYC-WTC_000186529
Notice regarding elevated occupational exposure levels to quartz, asbestos, and other agents at the World Trade Center site in late 2001.
Similarity score 0.993 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.987 (not a probability)
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NYC-WTC_000186529
Notice regarding elevated occupational exposure levels to quartz, asbestos, and other agents at the World Trade Center site in late 2001.
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