A cover letter accompanying chain-of-custody forms for asbestos air and dust samples collected at 176 Broadway in September 2001.
NYC-WTC_000105770Folder label: “176 BROADWAY; Block: 65 Lot: 17 BIN: 1001100 3-7 Maiden Lane”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
ii ..FAX TRANSMITTAL ~ .. ' . " s . .. NOTICE OF RE-OCCUPANCY LETTER NVIRONMENTAL AIRTEK ENVIRONMENTAL CORP.
39 WEST 38TH Sr. 12Th FLOOR. NEw YORK, NY 10018 PHONE (212) 768-0516 FAX (212) 768-0759 October 1, 2001 WWW.AIRTEKEN%'.COM
Tom Hinkley 176 Broadway New York, New York 10007 Regarding: Asbestos Testing at 176 Broadway, NYC Dear Mr. Hinkley:
Ambient air sampling was conducted at various locations of 176 Broadway on September 25th, 26th, & 27th, 2001. The sampling was conducted by licensed asbestos air sampling technicians throughout the entire building. In addition, dust bulk sampling was conducted to determine if the dust is asbestos-containing-material (ACM).
The air samples were transferred to Airtek's NYS DOH ELAP accredited laboratory via chain of custody procedures. The air samples were analyzed with Phase Contrast Microscopy (PCM). In PCM laboratory analysis method all fibers that meet certain criteria are counted. PCM laboratory analysis method does not distinguish between asbestos fibers and non-asbestos fibers. The laboratory results by PCM revealed that some air sample results were more than 0.01 fibers per cubic centimeter (>0.01 f/cc), which is above the NYC clearance/reoccupancy criterion. The samples that were above 0.01 f/cc were then transferred via chain-of-custody procedures to sub- contracted ELAP and NVLAP accredited laboratories to be analyzed by NIOSH Method 7402 Transmission Electron Microscopy (TEM). TEM analysis is a more advanced method that differentiates asbestos fibers from other fibers. The subsequent TEM analysis showed most fibers to be of non-asbestos nature. The final results based on TEM analysis reveal levels below 0.01 asbestos fibers by cubic centimeters.
Bulk samples of dust found in the building were transferred to Airtek's NYS DOH ELAP accredited laboratory via chain-of-custody procedures. These dust samples were analyzed with Polarized Light Microscopy (PLM). All samples were found to be non-asbestos containing materials or containing less than 1% asbestos by weight, which is the definition of an ACM.
The results of the analyses of all samples indicated concentrations to be less than the threshold of 0.01 fibers per cubic centimeters (< 0.01 f/cc) by TEM analyses for air samples, and less than one- percent asbestos for bulk samples by PLM analysis.
All sampling results are attached. Should you have questions or need more information, please do not hesitate to call me at (212) 768-0516.
Sincerely, Airtek Environme tal Co .
Mike Zouak President ENVIRONMENTAL ENGINEERING CONSULTANTS
NYC-WTC 000105770
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