NYC-WTC_000208775

NYC 9/11 Public Portal Document

1 WTC Occupational Exposure Limit List

Adjustment Adjustment Shift Adj. Agsnt Category Factor TLV PEL OEL OEL Comment Benzene III 0.48 0.5 1 3 0.5 0.24 (ppm) Ethyl Benzene III 0.48 100 100 100 48 (ppm) Toluene IV 0.67 50 200 50 34 (ppm) Xylene 11 0.67 100 100 100 67 (ppm)

Acids Hydrobromic Acid 1-A 1 3 3 3 3 (ppm) TLV-C Hydrochloric Acid 1-A 1 5 7 5 5 (ppm) TLV = C;PEL = STEL Hydrofluorlo Acid as Fluoride 1-A 1 3 3 3 3 (ppm) TLV = C NltrlCAold II 0.67 2 2 2 1.3 (ppm): TLV STEL = 4 Phosphoric Acid 1-B 1 1 1 1 1 (mg/m3)TLVSTEL=3 Sulfuric Add 1-B 1 1 1 1 1 (mg/ra3)TLVSTEL=3

Dust Cristobalite III 0.48 0.05 0.5 0.05 0.024 {mg/m3) Quartz III 0.48 0.05 0.1 0.05 0.024 (mg/m3) OSHA PEL determined by formula (0.1 assumed high % quartz) Respirable Dust l-C 1 3 5 3 (mg/m3)

Asbestos Asbestos III 0,48 0.1 0.1 0.1 0.05 (f/CC) PEL STEL= 1

PAHS 0.10 (mg/m3) TLV for coal tar ptich volatiles compared to sum of all Total PAH III 0.46 0.2 0.2 0.2 individual analytes, Al

Diesel Exhaust Diesel Exhaust Particulates 0.02 0.02 0.02 {mg/m3) TLV In NIC as elemental carbon

Mercury Mercury IV 0.67 0.025 0.1 0.025 0.017 (mg/m3)PEL = C I n 1 Sulfides r Sulfur Dioxiae Hydrogen Sulfide 1-B l-C 1 1 2 10 5 20 2 10 2 10 (ppm) TLV STEL= 5 (ppm) PEL = C; TLV NIC = 5 ppm s 3 Q

Key: I i 1. OEL - the lower of the TLV and PEL 2. NIC = Notice of Intended TLV Change value I—‘ : 3. WEEL <-■' '■'rkplace Environmental Exposure Limit (AIHA) Page" >

NYC-WTC_000208776