Ambient air sampling report, 40 Rector Street, Sep-Oct 2001

NYC 9/11 Public Portal Document

n 40 Rector Holdings, LLC ATC Project No.: 19855-0001 C/0 Tannenbaum Helpern Syracuse & Hirschtritt LLP October 25,2001 Ambient Air Sampling - 40 Rector Street Page 3 Of 7 isJ

n custody forms and laboratory generated analytical data is included in Attachment 2 at u the end of this report. A summary of the data is provided in Table 2.

U Table 2 Summary of Ambient Air Sample Results n Floor Analytical Result Floor Analytical Result 1 No structures detected 10 No structures detected 2 No structures detected 11 No structures detected nu 3 No structures detected 12 No structures detected 4 No structures detected 14 No structures detected 5 No structures detected 15 No Structures detected n 6 No structures detected 16 No structures detected y 7 No structures detected 17 No structures detected 8 No structures detected 18 No structures detected 9 No structures detected 19 No structures detected J n Based upon the analytical results recording levels within the AH ERA clearance requirement, it is ATC’s opinion that the ambient air samples collected throughout the building following the subsequent cleaning met an acceptable criterion for re-occupancy.

uJ lAQ Evaluation The lAQ evaluation included collection of real-time measurements of temperature, lJ relative humidity, carbon dioxide (COj). carbon monoxide (CO), respirable particulates and total volatile organic compounds (TVOC). Currently, there are no regulatory n standards for indoor air quality in non-industrial buildings, such as offices and schools. u For the real-time data collected, ATC uses the commonly accepted guidelines cited in the following publications: n • Ventilation for Acceptable Indoor Air Quality (ASHRAE 62-1999), American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE); p'q • Thermal Environmental Conditions for Human Occupancy (ASHRAE 55-1992); IJ • Industrial Hygienists Guide to Indoor Air Quality Investigations (1993), American Industrial Hygiene Association (AIHA).

Table 3 on the following page lists target guidelines for the parameters that ATC evaluated during this investigation.

ATC Associates Inc. © 2001 U

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