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NYC-WTC_000202442
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NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan October 8, 2002 Respirable Particulate Sampling Page 2 P.S. 234M ATC Project No. 15-19125-0279
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 A nil A MMM : UIv' ■I 65 micrograms per cubic Respirable meter of air (pg/m^) 24-hour USEPA NPAAQS Particulates (PM^j) average________________ 40 micrograms per cubic USEPA recommendation for meter of air (pg/m^) 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 Main Lobby. The analytical laboratory report is provided in the attachment.
The 24-hour average concentration of PM, , was 25.7 ug/m’ (below the limit of detection) which is below both the EPA NPAAQS for PM, , of 65 ug/m’ and the EPA recommended level of 40 ug/m\
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 TES JNC.
James R. Cohn, CIH, CSP Regional Manager, Industrial Hygiene Division
Attachment
CITY_21MC100_003272710
NYC-WTC_000202443
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NYC-WTC_000202443Source: NYC Law Department, mirrored locally
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