8 shared non-person entities · 1 shared topics · similarity 0.993
machine-extracted · confidence unavailable · Check page ↗Document / 2 pages
Air sampling report for silica dust, Feb 2002
Machine-extracted title · confidence 95%Letter report from ATC Associates regarding air sampling for silica-containing dust at a NYC Board of Education school in February 2002.
NYC-WTC_000175070–000175071Page image
OCR text
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan March 1, 2002 Air Sampling for Silica Page 2 Stuvvesant High School ATC Project No. 15-19125-0246
The amount of quartz in this sample was <22%, therefore the PEL for this dust would be:
lOmg/m^ 0.417 mg/m’ 22 + 2
The silica concentration in this sample was 3.2% of the calculated PEL,
The OSHA PEL is the only regulatory standard for silica exposure, however it is intended for occupational exposure in settings such as foundries, sandblasting, rock drilling, etc. The EPA does not have an ambient-air quality standard for silica.
Silica was not detected above the analytical limit of detection in any of the remaining samples collected on this date.
ATC appreciates the opportunity to provide this indoor air quality consultative service to the BOE. Please call me at (212) 353-8280 extension 212 if you have any questions.
Sincerely, ATC Associates, Inc.
James R. Cohn, CIH, CSP Regional Manager Industrial Hygiene Division
Attachment
CONFIDENTIAL, CITY_21MC100_003429705 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000175071
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000175071Source: NYC Law Department, mirrored locally
Related records
Browse subjects →Ranked by indexed similarity. Reasons describe shared subjects and filing context; check the source records.
Same-box records
NYC-WTC_000175068
Letter report from ATC Associates regarding air sampling for silica-containing dust at a NYC Board of Education school in January 2002.
8 shared non-person entities · 1 shared topics · similarity 0.993
machine-extracted · confidence unavailable · Check page ↗8 shared non-person entities · 1 shared topics · similarity 0.992
machine-extracted · confidence unavailable · Check page ↗7 shared non-person entities · 1 shared topics · similarity 0.992
machine-extracted · confidence unavailable · Check page ↗8 shared non-person entities · 1 shared topics · similarity 0.991
machine-extracted · confidence unavailable · Check page ↗7 shared non-person entities · 1 shared topics · similarity 0.990
machine-extracted · confidence unavailable · Check page ↗8 shared non-person entities · 1 shared topics · similarity 0.990
machine-extracted · confidence unavailable · Check page ↗7 shared non-person entities · 1 shared topics · similarity 0.990
machine-extracted · confidence unavailable · Check page ↗8 shared non-person entities · 1 shared topics · similarity 0.987
machine-extracted · confidence unavailable · Check page ↗8 shared non-person entities · 1 shared topics · similarity 0.985
machine-extracted · confidence unavailable · Check page ↗8 shared non-person entities · 1 shared topics · similarity 0.983
machine-extracted · confidence unavailable · Check page ↗8 shared non-person entities · 1 shared topics · similarity 0.982
machine-extracted · confidence unavailable · Check page ↗Filed elsewhere
No available related records indexed in this group.
More like this page
Similar subjects in other documents. Similarity does not establish the same event, measurement or conclusion.
Similarity score 0.993 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.993 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.991 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.990 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.988 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.988 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Others also read
Readers open these alongside this record — through an Ask answer, the same folder, or indexed similarity. Not a claim they are about the same event.
Similar indexed content
NYC-WTC_000175068
Letter report from ATC Associates regarding air sampling for silica-containing dust at a NYC Board of Education school in January 2002.
Similar indexed content
Similar indexed content
Similar indexed content
Similar indexed content