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Daily Environmental Monitoring Summary

Tuesday, February 12, 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 5:30 p.m. on 2/12

Air: Fixed Monitors in New York:
Asbestos - EPA analyzed 71 samples taken in and around ground zero from February 3 through February 5. EPA also sampled for asbestos at two additional lower Manhattan locations from February 2 through February 4. All but one sample showed results less than 70 structures per square millimeter, which is the Asbestos Hazard Emergency Response Act (AHERA) standard for allowing children to re-enter school buildings after asbestos removal activities. One sample, taken on February 5 at Location C (Trinity & Liberty Streets) showed 88 structures per square millimeter. This brings the total number of air samples collected and analyzed for lower Manhattan to 5,827, with 32 samples above the standard (27 of these were collected prior to September 30, the other five were collected on October 9, November 27, December 27, January 14 and February 5).

Air: Fixed Monitors outside Lower Manhattan:
Asbestos - Samples were collected from additional asbestos monitors at Intermediate School 143 (511 W. 182nd St., Manhattan), Public School 154: 333 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) from February 2 through February 4. None showed exceedances of the AHERA re-entry standard.

Staten Island Landfill:
Air (Asbestos) - Thirty-four air samples collected on February 4 and February 5 were analyzed for asbestos. All samples were below the school re-entry standard.

Ambient Air Samples:

Particulate Monitoring - EPA used portable monitors to collect samples on February 11 at Location R (northwest side of Stuyvesant High School) and Location L (northeast side of Stuyvesant High School). All readings were below the OSHA time-weighted permissible exposure limit for particulates.

Dioxin - A total of 6 samples were collected from January 21 through January 28 from several locations in lower Manhattan. All samples collected were below the EPA Removal Action guidelines (based on a 30-year exposure).

VOC's - Sampling for volatile organic compounds (VOCs) was conducted on February 11 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 on February 11 at EPA's Wash Tent (West & Murray Streets), Austin Tobin Plaza, the South Tower debris pile, and the North Tower debris pile showed no detectable levels of VOC's, or the levels of VOC's did not exceed OSHA standards.

Latest Available Daily Environmental Monitoring Summary

EPA information about the events of September 11

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