Letter report from ATC Associates regarding air sampling for silica-containing dust at a NYC Board of Education school in March 2002.
NYC-WTC_000175072
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
104 East 25th St., 10th Floor New York. New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 associates INC.
April 3, 2002
Mr. Bernard P. Orlan Director, Environmental Health and Safety New York City Board of Education 28-11 Queens Plaza North Long Island City, NY 11101
Re: Air Sampling for Silica Dust Stuyvesant High School ATC Project No. 15-19125-0246
Dear Mr. Orlan:
ATC Associates, Inc. (ATC) is pleased to provide this report of air sampling for silica-containing dust conducted on March 6 and 13, 2002, at the referenced school. The New York City Board of Education (BOE) requested this sampling at the recommendation of H. A. Bader, a consultant to the parents association.
ATC collected a total of twelve (12) samples on each day for respirable dust using pre-weighed 37mm PVC filters connected to size-selective cyclones to remove the larger (non-respirable) particles prior to deposition on the filters. Eleven (11) samples were collected inside the building and one sample was collected outdoors. The samples were sent to PSC Analytical Services, Inc., an American Industrial Hygiene Association accredited laboratory in Reading, PA. One blank filter was also submitted. Analysis was performed by x-ray diffraction according to NIOSH Method 7500. A copy of the analytical laboratory report is attached.
Tenzin Namgyal and Wagdi Abdelshahid, Industrial Hygienists from ATC’s New York City office, conducted the sampling consistent with accepted industrial hygiene practices. The results represent the conditions on the days the samples were collected.
Silica was not found above the limits of detection in any of the samples from either day.
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,
James R. Cohn, CIH, CSP Regional Manager, Industrial Hygiene Division
Attachment
CONFIDENTIAL, CITY_21MC100_003429726 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000175072
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NYC-WTC_000175060
Letter report from ATC Associates regarding air sampling for silica-containing dust at a NYC Board of Education school in December 2001.
8 shared non-person entities · 1 shared topics · similarity 0.993
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000175784
Report detailing respirable silica dust air sampling conducted at a school in April and May 2002 upon request from the Board of Education.
7 shared non-person entities · 1 shared topics · similarity 0.985
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Letter report detailing silica-containing dust sampling conducted on March 8, 2002, at the referenced school.
7 shared non-person entities · 1 shared topics · similarity 0.971
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NYC-WTC_000175060
Letter report from ATC Associates regarding air sampling for silica-containing dust at a NYC Board of Education school in December 2001.
Similarity score 0.996 (not a probability)
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000175784
Report detailing respirable silica dust air sampling conducted at a school in April and May 2002 upon request from the Board of Education.
Similarity score 0.992 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.992 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.991 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.991 (not a probability)
machine-extracted · confidence unavailable · Check page ↗Similarity score 0.990 (not a probability)
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NYC-WTC_000175060
Letter report from ATC Associates regarding air sampling for silica-containing dust at a NYC Board of Education school in December 2001.
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Report detailing respirable silica dust air sampling conducted at a school in April and May 2002 upon request from the Board of Education.
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