Air sampling lab report, 2 Rector Street, Sep 2001

NYC 9/11 Public Portal Document

H~vgie hetics (a E' Vvironmental Hygienetics Environmental Services, Inc. 1 West 34th Street Phone: (212) 244-3443 7th Floor Fax: (212) 244-8505 New York, NY 10001 September 26, 2001

Mr. Victor Purpura Building Manager Stellar Management Two Rector Street New York, NY 10006

Re: Report of Air Sampling Results Two Rector Street -Floors PI.I._._._._._._._._._._._._

Dear Mr. Purpura:

As requested, Hygienetics Environmental Services, Inc. (Hygienetics) conducted ambient air sampling at the captioned areas. This air sampling was conducted on September 19 - 21, 2001.

Methodology:

Air monitoring was performed by setting up a sampling train at each sampling location. Each train consisted of a high volume air sampling pump, which was calibrated to collect air in accordance with the appropriate sampling methodology (NIOSH 7400 Method for airborne fibers), attached to 0.45 micrometer pore size, 25 millimeter diameter mixed cellulose ester membrane filter cassettes with tygon tubing. Open faced cassettes were utilized for the air sampling.

Area air samples were collected at representative interior spaces on each of the referenced floors at Two Rector Street. In addition, field blank samples were also submitted to the analytical laboratory, for quality control/quality assurance (QA/QC) purposes. A total of 74 samples were submitted for analysis by Scientific Laboratories, Inc. a New York State Department of Health (ELAP) Approved laboratory.

On-site pump calibration was performed with a high-flow rotameter, at the start and completion of each sample collection period, to ensure an accurate volumetric reading. The rotameter's calibration was confirmed prior to its use on-site, utilizing a Mini Buck Model M-30 bubble calibrator, a primary calibration standard.

Sample Data and Discussion

Optical Phase Contrast Microscope Analysis:

Please refer to copies of the attached analytical laboratory's report for the results of the sampling conducted. In summary, the levels of measured airborne fibers present during the sampling period were relatively low, and did not approach or exceed any applicable, enforceable industrial exposure limits as set by governmental agencies.

At the present time, there are no non-industrial indoor air quality standards, or permissible exposure limits for airborne asbestos. However, a generally accepted airborne fiber concentration for "Clean Air" subsequent to asbestos abatement activities in commercial buildings in New York City is 0.01

NYC-WTC 000113977