September 11 public health conference agenda, Feb 2002

NYC 9/11 Public Portal Document

■■

around foe perijneter are lower than those found directly over foe pile. To dale, only one sample taken on foe rubble pile showed dioxin levels which mmeeded background level. Dioxins are considered collectively as suspect human carcinogens. OSHA does not have a PEL for dioxins. Polynaclear Aromatic Hydrocarbons OSHA has taken 1X0 samples (excluding blanks). The majority of the samples have not shown foe presence ofben2o(a)pyrcne and/or one or num of five additional fused polycyclic hydrocMbons: aofoxaeene, acridine, pyrtaic, chxyscocaadphesuiathrea*. Sample resulte to Hate have identified ei^t samples which reached or exceeded OSHA’s coal tar pitch verfatfle PEL * of02ing/m’. These pcnoBal samples were taken on the pile on iron workers and grappler operators. OSHA continues to recommend foe use of respiratory protection when working in foe debris field. Freon B-22, Hydrogen Flnorlde & Phosgene: OSHA has taken a total of208 samples forFreoo K-22 (chJorodifiouromeihane), hydrogtai fluoride, and phosgene. Only one Freon sample resulted in a detectable level of 6.4 ppm daring the transfer of Kaon finoom the auxiliary diiller, and all other samples were aone-detededL OSHA does not have an exposure limit fin Fieoa R-22. (The NIOSH REL for Freon 'c lOOOppm..) Sas^ling for foe decompositioa products of Freon R-22, 'i. hydrofluoric add (HF) and phosgene showed no detectable levels.

bu.- ■ b; Inorganic Adds OSHA has taken approxfaxialely 151 samples for Inorganic adds such as hydrochloric, phosphoric, and sulTuiic acid*. Three aamplcs for sulfone aeid w were found to exceed OSHA’s peeniscible exposure limit (PEL) of 1 •• ■Woikera ware sorting debris

JI ^CvXMdeeefMItraKeaf Sampling cm grappler opcsston on foe r^Ue pile, and on employees at the

a B• ■ ■■ ■ trade wash stations revealed trace levels of nitric oxide and nitrogen dicedde. SQi perKmal and area results were found to be below OSHA Hmits. Pages of 4 R\' BWteXn- .

TT’d £S:32 2002 8T Jew 2^TSW)ZJT2:xej NYC-WTC_000144656