NYC-WTC_000195926

NYC 9/11 Public Portal Document

U.S. Environmental Protection Agency (www.epa.gov') Air / Bulk / Wipe/ Water Sampling Situation Report Monday, October 22, 2001 (2:00 PM)

Ambient Air Sampling Locations

NYC / ER (Oct 19) - Particulate Monitoring (PM2.5)

O Pace University (Site 1) - 24-hr average concentration for this period was 26.44 ug/mL o Manhattan Boro Community College (Site 2) - 24-hour average concentration for this period was 18.37 ug/m^. O Coast Guard Building - Battery Park (Site 3) - 24-hour average concentrations for this period-was 15.43 ug/m'‘. o All readings below the National Ambient Air Quality Standard for PM2 5 (65 ug/m^).

NYC / ER (Oct 20) - Particulate Monitoring (PM2.5) o Pace University (Site 1) - 24-hr average concentration for this period was 27.77 ug/m^. o Manhattan Boro Community College (Site 2) - 24-hour average concentration for this period was 24.82 ug/m^. ■ O Coast Guard Building - Battery Park (Site 3) - 24-hour average concentrations for this period was 20.22 ug/tn. O All readings below the National Ambient Air Quality Standard for PM2.5 (65 ug/m’).

NYC / ER (Oct 20) - Particulate Monitoring (Dataram) o Particulate levels noted at three locations (Stations L, N, R) were below the OSHA TWA. o Instruments operated approximately 6 hours. o Station L values ranged from 59.1 to 124.2 ug/m3 with an average of 110.7 ug/m3. o Station N values ranged from 0 to 139.5 ug/m3 with an average of 116.9 ug/m3. o Station R values ranged from 58.2 to 144.7 ug/m3 with an average of 121.6 ug/m3.

NYC/ ER (Oct 21) - Particulate Monitoring (Dataram) o Particulate levels noted at three locations (Stations L, N, R) were below the OSHA TWA. o Instruments operated approximately 3 'A hours. o Station L values ranged from 58.2 to 98,5 ug/m3 with an average of 83.8 ug/m3. o Station N values ranged from 0 to 101.1 ug/m3 with an average of 86.1 ug/m3. o . Station R values ranged from 51.2 to 79.3 ug/m3 with an average of 67.7 ug/m3. NYC / ER (Oct 19) - Volatile organics (TAGA)

O Benzene exceeded OSHA TWA PEL (1 ppm) at one location on the debris pile in the plume at ground level.

NYG / ER (Oct 20) - Volatile organics (TAGA)

O Benzene exceeded OSHA TWA PEL (1 ppm) at one location on the debris pile in the plume at ground level. NYC / ER (Oct 21) - Volatile organics (TAGA)

O Benzene exceeded OSHA TWA PEL (1 ppm) at one location on the debris pile in the plume at ground level.

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NYC-WTC_000195926