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NYC-WTC_000232344
Label derived from the City's folder field. The City does not supply document titles.NYC-WTC_000232344–000232346Page image
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OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
104 East 25“'Street 10“’ Floor New York, New York 10010-2917 212.353.8280 Fax 212.353.8306 ASSOCIATES INC.
Mr. Bernard P. Orlan February 5, 2002 Page 2
• Following the removal and replacement of ceiling tiles and cleaning of these areas, a visual inspection shall be conducted by an independent third party project monitoring firm and/or New York City School Construction (NYCSCA) representatives to verify that all surfaces have been properly cleaned and are free of visible dust/debris.
• Prior to aggressive air sampling, io ensure air quality is not affected, the following shall be done: As a precaution, installfilter material over each supply air diffuser prior to the activation of the mechanical ventilation system. The ventilation system shall be run for approximately twenty four (2d) hours. The system shall then be shut off and all externalfitters shall be removed. Aggressive air monitoring shall then be conducted throughout the space with the ventilation system running.
• Air sampling shall be performed on each floor as the cleaning work is completed in a specific zone. Aggressive air sampling shall be conducted in the areas below the ceiling and ambient air sampling shall be conducted in the air plenum (above ceiling) with the ventilation system running. A total of 7 samples will be collected on each floor; 5 aggressive samples below ceiling and 2 ambient air samples above ceiling. ATC Associates Inc. will perform the air sampling and analysis. All air sampling shall be conducted in compliance with all applicable local, state and federal regulations
• Air samples shall be analyzed via Transmission Electron Microscopy (TEM) methodology. Successful air clearance shall be achieved when all air samples collected within the building are below 70 structures per millimeter squared (<70 str/mm^) - TEM analysis.
Kiss Construction, Inc. has been retained by NYCSCA for this project and is scheduled to commence work at 8:00 AM on February 5, 2002. Kiss Construction has estimated that this work will be completed within four weeks.
CITY_21MC100_010223702
NYC-WTC_000232345
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NYC-WTC_000232345Source: NYC Law Department, mirrored locally
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