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NYC-WTC_000205304
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan October 14, 2002 Respirable Particulate Sampling Page 2 P.S. 89M. ATC Project No. 15-19125-0297
The table lists target guideline for the parameter that ATC evaluated during this investigation. Meeting the listed value does not assure that acceptable indoor air quality will be achieved at all times.
TARGET GUIDELINE FOR INDOOR AIR QUALITY PARAMETER EVALUATED PARAMETER ■ OR _________________ ______________ noN 65 micrograms per cubic Respirable meter of air (pg/mQ 24-hour USEPA NPAAQS Particulates (PM, 5) average________ _________ 40 micrograms per cubic USEPA recommendation for meter of air (pg/mQ 24-hour children and sensitive average individuals USEPA = United States Environmental Protection Agency NPAAQS = National Primary Ambient-Air Quality Standard
RESULTS
ATC collected one (1) 24-hour gravimetric sample in the U‘ Floor Hallway by the Cafeteria. The analytical laboratory report is provided in the attachment.
The 24-hour average concentration of PM, 5 was 9.72 ug/m^, which is below both the EPA NPAAQS for PM, of 65 ug/m" and the EPA recommended level of 40 ug/mh
It is our pleasure to provide these indoor air consultative services to the New York City Department of Education. If you have any questions about this report, please call (212) 353-8280, extension 212.
Sincerely, A TC ASSOCIA T£S INC.
James R. Cohn, CIH, CSP Regional Manager, Industrial Hygiene Division
Attachment
CITY_21MC100_009261759
NYC-WTC_000205305
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NYC-WTC_000205305Source: NYC Law Department, mirrored locally
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