Site identification record, 74-90 Church Street, Oct 2001

NYC 9/11 Public Portal Document

Mr. Shaun Hession . 1 I New York City Housing Authority November 12, 2001 EMTEQUE Page 6

TABLE 3 DIOXIN Sample #/Location Equivalent TAGM EPA Concentration Standard (ppt) Superfund (ppt) Standard (ppt) D-5-02 972 600 1,000 5th Floor — South wall toward SW corner (3 offices from end) D-6-03 1098 600 1,000 6th Floor — Toward western wall, second cubicle row from southern wall

Due to the nature and hazards associated with dioxins, various groups have done recommended that all avoidable exposures be reduced. The EPA and NIOSH have significant studies on dioxin. Various exposure limits have been proposed but no limits carcinogens have been established. NIOSH's policy has been that when a threshold for that would protect 100% of the population has not been identified then NIOSH usually recommended that occupational exposures to carcinogens be limited to the lowest feasible concentration.

• Conclusions and Recommendations

The initial intent of this preliminary assessment was to determine whether potential environmental hazards exist. Based upon the sampling conducted and analytical results obtained, environmental hazards have been identified within the subject space. Based upon the analytical results obtained, EMTEQUE presents the following conclusions:

• Asbestos appears to be present in the debris and settled dust throughout the building. • Metals and silica were observed to be present throughout the dust and debris. amount The levels appear relatively consistent and appear dependent upon the of dust present. • Polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) were detected in debris within the building. • Dioxins were detected within debris in the building. • Based upon the concentrations identified during the sampling, EMTEQUE concludes that contamination is present throughout the inspected space.

Based upon the identified conclusions, EMTEQUE presents the following recommendations:

• Due to the presence of mercury containing dust that has settled on papers on throughout the space, EMTEQUE has a concern that the mercury may bind itself • to the organic fibers within the paper. As such, EMTEQUE recommended sampling paper after it was cleaned by the restoration contractor in order to

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