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Daily Environmental Monitoring Summary

Friday, January 11, 2002

The U.S. Environmental Protection Agency (EPA) and other federal, state and local agencies have collected extensive environmental monitoring data from the World Trade Center site and nearby areas in Manhattan, Brooklyn and New Jersey. Since September 11, EPA has taken samples of the air, dust, water, river sediments and drinking water and analyzed them for the presence of pollutants that might pose a health risk to response workers at the World Trade Center site and the public. The samples are evaluated against a variety of benchmarks, standards and guidelines established to protect public health under various conditions. EPA is collecting data from more than 20 fixed air monitors in and around ground zero and additional monitors in the Bronx, Brooklyn, Queens and Staten Island. The Agency is also using portable sampling equipment to collect data from a range of locations.

Results as of 6:30 p.m. on 1/11

Air: Fixed Monitors outside Lower Manhattan:
Asbestos - Samples were collected from asbestos monitors at Public School 154 (33 East 135th St., Bronx), P.S. 274 (800 Bushwick Ave, Brooklyn), P.S. 44 (80 Maple Parkway, Staten Island) and P.S. 199 (3290 48th St., Queens) on January 6. None showed exceedances of the AHERA re-entry standard.

Staten Island Landfill:
Air (Asbestos) - Thirty-four air samples collected on January 7 and 8 were analyzed for asbestos. All were below the school re-entry standard.

Air (Particulates) - EPA used portable monitors to collect samples of particulates on January 10 at the Staten Island Landfill. There were no significant readings.

Ambient Air Samples:
Particulate Monitoring - EPA used portable monitors to collect samples on January 10 in the following locations: L (north east side of Stuyvesant High School); N (south side of Pier 25); and R (northwest side of Stuyvesant High School). All readings were below the OSHA time-weighted permissible exposure limit for particulates.

VOCs - Sampling for volatile organic compounds (VOCs) was conducted on January 10 in the direct area of the debris pile at ground zero. To protect workers at the work site, EPA takes grab samples of VOCs where smoke plumes have been sighted. The results are snapshots of the levels at a moment in time. OSHA's protective standards set a permissible exposure limit (PEL) averaged over an 8-hour day.

All samples taken at EPA's Wash Tent (West & Murray Streets), Austin Tobin Plaza, the South Tower debris pile, and the North Tower debris pile either did not exceed OSHA standards, or showed no detectable levels, of either benzene or 1,3-butadiene on January 10.

Direct Air Readings - EPA did air monitoring in and around ground zero for a number of compounds on January 10. Nothing of significance was noted.

Latest Available Daily Environmental Monitoring Summary

EPA information about the events of September 11

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