NYC-WTC_000233680

NYC 9/11 Public Portal Document

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Lower Manhattan Development Corporation 130 Liberty Street Deconstruction Project Exceedance Report October 3,2005

Date of Exceedance: Wednesday, September 28,2005

Analyte: Asbestos AHERA

Location: Station 8, northeast area, roof level

Concentration: 96 s/mnr

USEPA Site-Specific Trigger Level: 70 s/mm^

Target Air Quality Level: N/A

Summary of Event:

An exceedance of the USEPA Site-Specific Trigger Level of Asbestos AHERA occurred on the roof level at 130 Liberty Street (Building) for one of the air samples collected on September 28, 2005. The sample was sent to and received by EMSL Analytical Inc. laboratory (NYSDOH ELAP #10872) September 29, 2005. On September 30, 2005, the sample was analyzed for TEM EPA 40 CER Part 763 and the results reported. The laboratory report is included in the attached Supporting Data.

Activities at 130 Liberty Street on this date included completion of the roof abatement. The work included gravel removal, vacuuming and wet-wiping all roof surfaces including, but not limited to, vents, mechanical surfaces, bulk heads, roof floor, and parapet wall. Work occurred from 8:00 AM through 5:00 PM.

No visual observations were made which could impact the samples on the roof. The Visual Inspection Report, attached in the Supporting Data, indicate no visual emissions were observed in the roof vicinity. Photographs taken on September 28, 2005 of roof activities were taken and are also included in the Supporting Data.

The wind rose, included in the attached Supporting Data, from the meteorological station located on the roof indicates a predominant south-south-east wind direction. Station 8, located on the northeast comer of the Building roof, can be considered upwind from the roof activities. The upwind Stations 6 and 7, located on the southwest and southeast corners, respectively, did not detect any asbestos above 19 s/mm- by the TEM method. The downwind Station 9, located on the northwest corner of the roof, had an asbestos TEM reading of 19 s/mm ’.

Submitted By: Ed Gerdts Date: October 3. 2005

CITY_21MC100_0 07121522

NYC-WTC_000233680