Daily environmental monitoring summary, Oct 17-18 2001

NYC 9/11 Public Portal Document

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EPA Newsroom J Daily Environmental Monitoring Summary Wednesday & Thursday, October 17-18, 2001

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

i 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 * V *• from 17 fixed monitors in and around ground zero and is using portable sampling equipment to collect data from a range of locations.

Fw SI Results as of 4:00 p.m. on 10/18

g Air: Fixed Monitors in New York and New Jersey: Asbestos - EPA analyzed 57 samples taken in and around ground zero, from October 14 through October 16. All samples showed results less than 70 structures per millimeter squared, which is the 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 Manhattan to 933, with 27 samples above the standard.

MS Staten Island Landfill: law Air (Asbestos) -15 samples were collected on October 15; fourteen of these showed results below the AHERA standard use for allowing re-entry into schools. One sample taken near the barge loading area exceeded this standard.

Particulate Monitoring - Samples collected on October 16 and 17 using portable monitors showed no significant readings.

Bulk Samples: Dioxin - Four archived samples originally collected on September 11 were analyzed for dioxin/furans. All samples showed levels of dioxin below the residential clean-up goal of 1 part per billion.

Ambient Air Sampling: Dioxin - Ten samples were collected in the restricted work area near ground zero on October 4 and analyzed for dioxin/furans. Four of the samples showed results above the level at which EPA would take some type of action to reduce people's exposure. This action level, however, is based on a 30-year exposure scenario.

Two of the samples taken at the southwest corner of Building #5 of the World Trade Center and at West Broadway and Barclay were slightly above the EPA's action level when adjusted to a 1-year exposure duration. These levels do not pose a short-term health affect but should be monitored if they persist for a longer period of time.

PM 2.5 - Monitoring for fine particulate matter (particles less than 2.5 micrometers in diameter) was conducted from October 14 to October 16 at Pace University, the

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