Contractor letter to DEP responding to notice regarding asbestos inspection and cleaning at 120 Broadway prior to re-occupancy.
NYC-WTC_000123776–000123794Folder label: “120 BROADWAY Block: 47 Lot: 7501 BIN: 1001026 70-84 CEDAR ST. 15-25 NASSAU ST. 2-16 PINE ST”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
A
dvanced Environmental Corp.
September 19, 2001 Ji OCT 011001 1111 BY ..... Mr. William Dacunto Managing Director of Operations Silverstein Properties 140 Broadway New York, New York 10005
Re: 120 Broadway, Transmission Electron Microscopy Air Sample Results, New York, NY
Dear Mr. Dacunto:
On September 15 16, and 18, 2001, Advanced Environmental Corp. performed air monitoring within random areas of 120 Broadway. Samples were collected on random floors to document the asbestos concentration levels of the ambient air.
Please be advised that at the present time, there are no non-industrial indoor air quality standards, or permissible exposure limits for airborne asbestos.
Air sampling was conducted using the Transmission Electron Microscopy (TEM) method according to the EPA AHERA protocol. TEM with energy dispersive X-ray analysis is an analytical method that enables a fibers chemical composition to be identified, in this case asbestos. This fiber specific protocol is generally utilized to determine clean 'air following a "large" abatement project. TEM sample analysis detects filter loads (the number of structures detected per square millimeter of collection media surface) which, if the average of the sample counts is less than or equal to EPA-AHERA release criteria of 70 structures per square millimeter (s/mm2), the area is safe for re-occupancy.
Although the average counts within 120 Broadway were less than the EPA-AHERA release criteria of 70 structures, as a precaution, Silverstein Properties performed additional cleaning throughout the building. Re- sampling was conducted in limited locations on September 18, 2001. Please be advised that no asbestos structures were found on these samples.
In conclusion, TEM sample data show acceptable concentrations of fibrous materials in the ambient air throu out the building.
If you ve any questions or need further clarification on air sampling methodology, please call me.
Sinc
Robert Pu Principal +cpys~ver~+dem Cbue~lsn. in~lao bwaywum afranipIe wtc.doc
347 Fifth Avenue, Suite 404, New York, New York 10016 Phone 212-545-1855 Fax 212-545-0757
NYC-WTC 000123781
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