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Legal hold notice for WTC documents, undated

Machine-extracted title · confidence 98%

Notice instructing staff to preserve original World Trade Center documents for potential legal actions against the City.

NYC-WTC_000148192–000148619

Folder label: “AIR ASBESTOS MONITORING REPORTS

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NYC 9/11 Public Portal Document

Air Monitoring in Lower Manhattan Page 3 of 3

DEP has been working with the involved City agencies, including the Board of , Education, to provide air monitoring in and around the schools near the World Trade Center disaster site. DEP is collecting 8 hour ambient air samples that are analyzed for asbestos at four locations. These locations are outside of the main entrances to: Stuyvesant High School, IS/PS 89, PS 234 and the High School of Economics and Finance. DEP began sampling on October 4, 2001. From October 4th through October 18th, DEP only did a TEM analysis if the PCM concentration was above 0.01 fibers per cubic centimeter (f/cc). During this period of time, there was only one reading above 0.01 f/cc. The TEM result was below the Asbestos Hazard Emergency Response Act (AHERA) standard of 70 structures per square millimeter (s/sqmm). As of October 19, DEP began conducting a TEM analysis on all samples to provide a direct comparison to the AHERA standard. Of the 356 samples that have been collected between October 19 and January 15, 2002, all have been well below the AHERA standard of 70 s/sqmm. Since that period, the results continue to be well below the AHERA standard.

School Monitoring Data

Additonal Information

. Advisory for Building Façade Clean-up . Notice to Building Owners Located South of 14th Street. Manhattan: Building Maintenance Issues Involved in Reopening Buildings Closed Since 9/11/01 . New York City Department of Health Responds to the World Trade Center Disaster

Last updated February 1, 2002

Air, Noise and Hazardous Materials

DEP · Air monitoring in Lower Manahattan · Certified Asbestos Investigators. Contractors and Firms . Asbestos Rules and Regulations (top ) · Asbestos Abate nent Activity Forms

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NYC-WTC 000148602

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NYC-WTC_000148602Source: NYC Law Department, mirrored locally

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