Air monitoring data summary, NYC DOH, Sep 2001

NYC 9/11 Public Portal Document

DRAFT

Particulate monitoring (PM 2.5)

Agency Date Location N samples N above Max (of Comment (continuous threshold * 24 hour monitoring) averages) NYSDEC 9/24/01 Fresh Kills Landfill 1 (24 0 MT” hour average) 9/24/01 Schools and neighborhoods 10 (24 hour 0 34.3 distant from controlled zone averages)

* Proposed National Ambient Air Quality Standard is 65 ug/m3 maximum for a 24 hour period and 15 ug/m3 annual arithmetic mean.

Interpretation: No immediate public or occupational health threat.

Other Monitoring

Hudson river and water runoff from site: As reported by EPA Sunday Sept 24: ambient results to date show no observed effects due to the WTC disaster. Samples collected in the vicinity of the WTC are generally diluted relative to the up-river sample. The East River sample results are similar to those from the Hudson River background location.

Sediment results; As reported in EPA’s Sunday Sept 24 Dredge Material Sediment Sampling Summary, dioxin and furan (TCDD/TCDF) samples collected on Sept. 15 (recently rec’d) greatly exceed HARS disposal criteria. The material is being disposed of in the Newark Bay Borrow Pits, which is designed to accommodate dredge material. PCBs (aroclors) detected in the dredge sample were weathered suggesting a relatively old source. n H

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