NYC-WTC_000199709

NYC 9/11 Public Portal Document

[ J,eSsica Leighton - RA_sitrepO4-16.wpd Page 5 j

o Station L had an average of 28.60 ug/m’ with a maximum reading of 97.77 ug/m\ o Station N had an average of 28.72 ug/m^ with a maximum reading of 86.44 ug/m’. o Station R had an average of 26.58 ug/m’ with a maximum reading of 124.43 ug/m\

NYC / ER (Apr 15) - Particulate Monitoring (Dataram)

o Particulate levels noted at Locations L, N, and R were below the OSHA TWA. o Instruments operated approximately 8 hours. o Station L had an average of 35.27 ug/m^ with a maximum reading of 121.97 ug/mL o Station N had an average of 29.77 ug/m’ with a maximum reading of 69.95 ug/m\ o Station R had an average of 27.03 ug/m’ with a maximum reading of 59.05 ug/m\

NYC / ER (Apr 11) - Volatile Organics (Mobile Laboratory)

o Volatile organic compounds were not detected above the detection limit (20 ppbv) in any of the four samples collected (Washing Tent, Austin Tobin Plaza, North Tower, and South Tower).

NYC / ER (Apr 12) - Volatile Organics (Mobile Laboratory)

o Volatile organic compounds were not detected above the detection limit (20 ppbv) in any of the four samples collected (Washing Tent, Austin Tobin Plaza, North Tower, and South Tower).

NYC / ER (Apr 13) - Volatile Organics (Mobile Laboratory)

o Volatile organic compounds were not detected above the detection limit (20 ppbv) in any of the four samples collected (Washing Tent, Austin Tobin Plaza, North Tower, and South Tower).

NYC / ER (Apr 14) - Volatile Organics (Mobile Laboratory)

o Volatile organic compounds were not detected above the detection limit (20 ppbv) in any of the four samples collected (Washing Tent, Austin Tobin Plaza, North Tower, and South Tower).

CITY_21MC100_003051227

NYC-WTC_000199713