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

NYC 9/11 Public Portal Document

Mr. Shaun Hession New York City Housing Authority November 12, 2001 •

EMTEQUE Page 7

ensure that the mercury could be completely removed. On Saturday November 3, 2001, EMTEQUE conducted sampling of a single piece of paper that had been covered with heavy levels of dust since September 11, 2001. A second piece of paper was obtained from an area considered to have a medium level of dust. A third piece of paper was obtained from within a file cabinet that had some dust infiltration. A fourth piece of paper was obtained from an unopened ream of paper to serve as a control sample. Belfour conducted all cleaning of the paper products. Due to the levels of dioxins, PCBs, PAHs and mercury observed (with the realization that none of these contaminants would typically be expected to be found in an office environment — or most other environments), EMTEQUE recommends that porous materials (i.e., carpeting, cubicle dividers, ceiling tiles, etc.) be disposed. EMTEQUE's recommendation is based on the fact that it may be difficult (or perhaps impossible) to clean these items. Though EMTEQUE anticipates that cleaning may provide a small cost savings over replacement, the issues of attempting to clean these materials, ensuring their cleanliness at the completion, and ensuring employees' satisfaction with those materials will at least be very difficult. If an attempt is made to perform cleaning of porouse materials, EMTEQUE recommends that a pilot study be performed to ensure that any cleaning performed will be sufficient and successful prior to starting a complete cleaning program. Recommendations for access, clean-up procedures, salvage of equipment, personal protective equipment, engineering controls, training, etc. will be •

identified in future specifications and procedures to be drafted by EMTEQUE and approved by NYCHA. dioxins, Due to the concentrations detected in the sampling for PCBs, PAHs and EMTEQUE recommended additional sampling. This work was approved by NYCHA and conducted by EMTEQUE on Thursday and Friday, October 25 and though 26, 2001. This data was not received in time to incorporate into this report much of this data has already been incorporated Into the summary tables incorporated included as an attachment to this report. This additional data will be into the text of the final site assessment report. The additional sampling was anticipated to allow EMTEQUE to characterize the dust and debris throughout elevated the entire space. The additional sampling results for dioxin indicate that dioxin levels are present in various areas throughout the various floors.

at Should you have any questions or require additional information, please contact us (212) 631-9000.

Submit ed bey, Re edby, lj ell A. Feldscher, Eric Telemaque Senior Environmental Manager President

Attachments

NYC-WTC 000124620