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Contaminant of Potential Concern exceedance table, Unit 2A

Machine-extracted title · confidence 90%

Table comparing contaminant levels before and after cleaning for Unit 2A, including dioxin, PAHs, asbestos, and lead.

NYC-WTC_000186138–000186172
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Scanned page image, NYC-WTC_000186157
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NYC 9/11 Public Portal Document

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Internal Review Draft

CONTAMINANT OF POTENTIAL CONCERN (COPC) EXCEEDANCE BY EVENT TABLE [ADD] - UNIT 4D, TEST 2A

Cleanup Criteria Pre-Cleaning Post - First Cleaning Post - Second Cleaning COPC Air Wipe MV Air• [Wipe MV Air |Wip~ MV Air MV Dioxin 0.001 ng/ni3 4 ng/m2 PAH 0.2 ug/m3 300 ug/m2 325.8 Asbestos 0.0009 f/cc n/a

Lead 1 ug/m3 25 ug/ft2 25 ug/ft2 169 83.5 0.146 R / 20.4 R 66 0.137 R 66R 26.2 10.6 R 39i9 15.6R 78^ 72.1 MMVF 0.01 f/cc n/a Silica 4 ug/m3 n/a

MV = Microvac o R = Result rejected H K I

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NYC-WTC_000186157

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NYC-WTC_000186157Source: NYC Law Department, mirrored locally

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