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Monitoring Summaries Monitoring Data Daily Environmental Monitoring Summary Frequently Asked Questions Friday-Monday, March B-11,2002 Pictures The U.S. Environmsntel Protection Agency (EPA) and other federal, state end food gPA Press Releases agencies have collected extensive environmental monitoring date from the VMcrid How You Can Help 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 drinldng water and analyzed them for the presence of pollutants toat might pose a health risk to response workers at toe Wwld Trade Center site and toe public. The samples are evaluated against a variety of benchmarks, standards and guidellnas established to protect public health under various conditions. EPA is collecting data from more toan 20 fixed air li-i&riuaE monitors in and around ground zero and additional monitors in the Bronx, Brooklyn, Queens end Staten Islencl. The Agents Ie also using portable sampling equipment to cotied dab from a range of locations.

Results as of 0:40 p.m. on 3/11

Air: Fixed Monitors in New York: Aebeatos - EPA analyzed IS samples taken In and around ground zero on March 1. Ail samples showed results less than 70 structures per square millimeter, which Is toe Asbestos Hazard Emergency Response Act (AHERA) standard for allowing children to re-enter school buildings after asbestos removal activities

This brings the total number of air samples collected and analyzed for lower Manhatbn to 6,623, with 17 samples above the standard (11 of base were collected prior to September 30; the other six were collected on October 8, November 27, December 27. January 14, February 6 and February 11).

This number of exceedances Is lower than reported on prior dally summaries. Earlier sampling results included an additional, unnecessary adjustment for the volume of air sampled. Using a more appropriate method, those results have been recalculated and the true levels of asbestos measured are generally lower. Consequently, the standard was actually exceeded less often than previously stated.

Staten bland Landfill; Air (Aebeatos) - Thirty-seven air samples collected on March land March 2 were analyzed for asbestos. All samples were below the school re-entry standard.

Metals - Four air samples were collected on February 22 and analyzed for metals. All metals were either not detected or were below applicable EPA Removal Action level guidelines. OSHA pels, and toe NAAQS for lead.

Ambient Air Samplee: Particulate Monitoring - EPA used portable monitors to collect samples on March 7 and March 6 at Location "L" (northeast side of Stuyvesant High School) and Location "N” (south side of Pier 26). All readings were below the OSHA time- weighted permissible exposure limit for particulates.

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