NYC-WTC_000195926

NYC 9/11 Public Portal Document

Bulk/Dust Samples

NYC / ER (Oct 10) - Semi-volatile organic compounds (base neutral acid extractable)

O 2 dust samples obtained from rooftops in the vicinity of the WTC (22 Cortlandt, 7* fl. and 600 Gateway Plaza, 34* fl.) revealed elevated levels of polyaromatic hydrocarbons (PAHs), O Both samples were above the EPA Removal Action guidance levels (based on a 30-year exposure) represented as Toxic Equivalency Factors (TEFs) for benzo(a)pyrene. O Both samples were below the adjusted EPA Removal Action guidance levels (based on a 1-year exposure) represented as Toxic Equivalency Factors (TEFs) for benzo(a)pyrene. o Assuming the roofs have not been cleaned, limited potential exists for exposure due to location. o Depending on the roofing materials used, the location (roof) may have contributed somewhat to the sample results. . o Dust samples previously collected on Sep 16 from street-level locations had significantly lower PAH levels.

Direct Reading Instruments

NYC / ER (Oct 19)

O Nothing of significance noted.

NYC / ER (Oct 20)

O Nothing of significance noted.

NYC / ER (Oct 21)

O Several readings noted above the carbon monoxide NAAQS (8 hr. average) of 9 ppm, but below the NAAQS (1 hr. average) of 35 ppm and the OSHA PEL of 50 ppm.

Water

NYC / ER (Oct 5) - Total Petroleum Hydrocarbon Fingerprint/PCBs

O 1 water sample collected from the basement of 140 West St. O The sample appeared to be indicative of a highly weathered fuel oil, most likely #4 fuel oil. O PCBs were not detected in the sample.

CITY_21MC100_003113370

NYC-WTC_000195927