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Contaminant of Potential Concern exceedance table, Unit 2A

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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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NYC 9/11 Public Portal Document

( ( ( Internal Review Draft

CONTAMINANT OF POTENTIAL CONCERN (COPC) EXCEEO^NCE BY EVENT TABLE [ADD] - UNIT 2A, TEST 1B

Cleanup Criteria 1 Pre-Cleaning | Post - First Cleaning | Post - Second Cleaning *POst - Third Cleaning COPC Air______ Air Wipi i MV Air Wipe MV Dioxin 0.001 ng/m3 4 ng/m2 PAH 0.2 ug/m3 300 ug/m2 : Asbestos 0.0009 f/cc n/a OL

“OL Lead 1 ug/m3 25 ug/ft2 25 ug/ft2 49S* 44m ; 35.4 MMVF 0.01 f/cc Silica 4 ug/m3 / n/a

OL = Overloading of particulates MV = Microvac

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NYC-WTC_000186138

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NYC-WTC_000186138Source: NYC Law Department, mirrored locally

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