NYC-WTC_000227065

NYC 9/11 Public Portal Document 104 East 25th St., lOtl New York, New York www.atc-envi 212.35: Fax 212.35: ASSOCIATES IWC.

April 29,2002

Mr. Bernard P. Orlan Director, Environmental Health and Safety New York City Board of Education 28-11 Queens Plaza North Long Island City, NY 11101

Re: Air Sampling for Metals High School off Economics amd Fimauce (833M) ATC Project No. 15-19125-0291

Dear Mr. Orlan:

ATC Associates, Inc. (ATC) is pleased to provide this report of air sampling for metals conducted on March 9, 16 and 23, 2002, at the referenced school. The New York City Board of Education (BOE) requested this sampling to ensure that acceptable air quality is being maintained.

Scope of Work

-Yi On each day, ATC collected four (4) samples for metals from locations throughout the building and outdoors. Samples were collected for ten (10) hours using 37 mm mixed cellulose ester ; ■!

filters coimected to battery-powered sampling pumps at a flow rate of 2 liters per minute. Pumps were calibrated before and after each sampling period. Three (3) samples were collected inside the building and one (1) was collected outdoors on the roof. One blank sample was also submitted per day. The samples were sent to PSC Analytical Services, Inc., an American Industrial Hygiene Association-accredited laboratory in Reading, PA. Analysis was performed by NIOSH Methods 7300M. The samples collected on March 9“* were analyzed for a panel of eleven (11) metals. The metals were aluminum (Al), cadmium (Cd), chromium (Cr), cobalt (Co), copper (Cu), iron (Fe), magnesium (Mg), manganese (Mn), molybdenum (Mo), nickel (Ni) and zinc (Zn). The samples collected on March 16* and 23”* were also analyzed for lead (Pb). Copies of the analytical laboratory reports are attached.

The sampling locations were: the Main Lobby, the 5* floor Hallway, the 10'‘ floor Hallway and the Roof.

Tenzin Namgyal and Wagdi Abdelshahid, Industrial Hygienists from ATC’s New York City office , collected the samples consistent with accepted industrial hygiene practices. The results represent conditions on the days the samples were collected.

The established regulatory values for metals are intended for industrial workplace exposures and are not generally applicable to office/school settings. There are no standards for these metals in indoor air in non-industrial situations.

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NYC-WTC_000227065