NYC-WTC_000199756

NYC 9/11 Public Portal Document

I Jessica Leighton - RA_sitrepO1-21.wpd Page 6

o Benzene was not detected above the detection limit (20 ppbv) in any of the three samples collected (Washing Tent, Austin Tobin Plaza, and North Tower), including in the debris area at ground level. o Limited number of VOCs detected above the detection limit (20 ppbv); all in the North Tower ground level sample. o The South Tower sample was not analyzed because it was lost due to a tear in the Tedlar bag.

NYC / ER (Jan 20) - Volatile Organics (Mobile Laboratory)

o Aside from two compounds detected above the detection limit (20 ppbv) at two of the locations (North and South Tower ground level), volatile organic compounds were not detected at any of the four locations above the detection limit (20 ppbv).

Direct Reading Instruments

NYC/ER (Jan 18)

o Low levels of carbon monoxide noted at nearly all stations during the afternoon monitoring period. o Otherwise, nothing of significance reported.

NYC / ER (Jan 19)

o Several readings noted during the morning monitoring period above the carbon monoxide NAAQS (8-hour average) of 9 ppm. o Low levels of carbon monoxide noted at nearly all stations during the afternoon monitoring period.

NYC / ER (Jan 20)

o Nothing of significance reported. o Real-time air monitoring will no longer be conducted after January 21.

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