Second volume of ambient air sampling and visual observation results for 105 Duane Street after the WTC collapse.
NYC-WTC_000104321–000104551Folder label: “105 DUANE ST 1001650, 151/1”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
v!ATC ASSOCIATES I N C. Ambient Air Sampling
Subject: Tribeca Towers 105 Duane Street Re: Ambient Air Sampling Location: Common Hallways during Duct Cleaning, 2nd floor Mechanical Room From: Fred Burkhardt Date: January 4, 2002
On December 27, 28 & 29, 2001, ATC collected a total of fourteen ambient air samples, ten from within common hallways and four within the 2"d floor mechanical room to ascertain the presence or absence of airborne asbestos. The sample methodology, quantity, and location were agreed upon between Related Management, ATC and H.A. Bader Consultants Inc. the tenants associations consultant. Samples were analyzed in accordance with the more stringent AHERA Transmission Electron Microscopy (TEM) method as set forth at 40 CFR Part 763, Subpart E, Appendix A. In the absence of a specific ambient air standard for asbestos, regulatory agencies have been using the AHERA re-occupancy requirement following an asbestos abatement action. This standard of an average of less than 70 asbestos structures per square millimeter (<70 s/mm2) per sample set is the most stringent reoccupancy requirement available, and has been designed to be protective of children following an asbestos project.
Based upon the analytical results from the 2"d, 5th, 10th, 15th, 20th, 25th, 27th, 34th, 41st floor hallways and 2nd floor mechanical room of no asbestos structures detected, which is below the AHERA clearance requirement. It is ATC's opinion that duct- cleaning activities did not result in elevated asbestos levels within those spaces, and the ambient conditions sampled are representative of the building at the time of testing and meet an acceptable criterion for occupancy. If you have any questions or require additional explaination of the information presented please do not hesitate to call me at 212-353-8280 extension 343.
Thank You.
NYC-WTC 000104517
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Summary of ambient air sampling and visual observations at 105 Duane Street following the WTC collapse.
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