Environmental assessment report, 100 Church Street, April 2002

NYC 9/11 Public Portal Document

4.5.5 Polychlorinated Biphenyls Seven (7) air samples were collected and analyzed for Polychlorinated Biphenyls (PCBs). Results of PCB air sampling are presented in Table 14 of Appendix A. A review of the data indicates that all of the results were below the analytical detection limit for PCBs.

4.5.6 Mercury Seven (7) air samples were collected and analyzed for mercury. Results of mercury air sampling are presented in Table 15 of Appendix A. A review of the data indicates that all of the results were below the analytical detection limit for mercury.

4.5.7 Respirable Particulates Eighteen (18) air samples were collected and analyzed for respirable particulates. Results of respirable particulate air sampling are presented in Table 16 of Appendix A. A review of the data indicates that all of the results, except one air sample, were below the analytical detection limit for respirable particulates. The air concentration of respirable dust for the one air sample where dust was detected was much lower than 5.0 mg/m \ the OSHA PEL.

4.5.8 Respirable Silica Quartz Eighteen (18) air samples were collected and analyzed for respirable silica quartz. Results of respirable silica quartz air sampling are presented in Table 17 of Appendix A. A review of the results indicate that all of the results were below the analytical detection limit for respirable sihca quartz.

4.5.9 Dioxins f Change to picograms to match Table 18J Seven (7) air samples were collected and analyzed for dioxins. Results of dioxin air sampling are presented in Table 18 of Appendix A. The results indicate that concentrations ranged from 0.0164 to 0.0856 picograms per cubic meter (pg/m3) expressed as 2,3,7,8 tetrachlordibenzo-p- dioxin (TCDD) toxicity equivalents (TEQ). The TEQ essentially sums the relative toxicities of each of the forms of dioxin found relative to TCDD, the most toxic form of dioxin. All results were well below the NIOSH limit of 10,000 fg/m3. In addition, these results were incorporated

23

CITY_21MC100_014586931

NYC-WTC_000176272