NYC-WTC_000197629

NYC 9/11 Public Portal Document

104 East 25th St.. 10th Floo New York, New York 10011 www.atc-enviro.con 212.353.8281 Fax 212.353 8301 ASSOCIATES INC.

July 17, 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 Hydrocarbons Stuyvesant High School ATC Project No. 15-19125-0246

Dear Mr. Orlan;

ATC Associates, Inc, (ATC) is pleased to provide this report of air sampling for hydrocarbon compounds conducted on April 10, 2002, at the referenced school. The New York City Board of Education (BOE) requested this sampling at the recommendation of H. A. Bader, a consultant to the parents association.

Scope of Work

ATC collected three (3) samples for hydrocarbon compounds (HC) at specified locations. Samples were collected for a minimum of seven (7) hours using activated coconut shell charcoal tubes connected to battery-powered sampling pumps at a flow rate of 0.2 liters per minute. Pumps were calibrated before and after each sampling period. Two (2) samples were collected inside the building and one (1) was collected on the roof. One blank tube was also submitted. The samples were sent to PSC Analytical Services, Inc., an American Industrial Hygiene Association-accredited laboratory in Reading, PA. Analysis was performed by capillary gas chromatography/flame ionization detection (NIOSH Methods 1003, 1005, 1022, 1300, 1500, 1501).

Temhn Namgyal and Wagdi Abdelshahid, Industrial Hygienists of ATC’s New York City office, conducted the sampling consistent with generally accepted industrial hygiene practices. The results of the sampling represent conditions found on the day the samples were collected.

Each sample was analyzed for a panel of sixteen (16) specific HC compounds. These compounds were: pentane, acetone, methylene chloride, hexane, chloroform, methyl chloroform, benzene, 1,2-dichloroethane, trichloroethylene, toluene, perchloroetyhylene (tetrachloroethylene), chlorobenzene, ethylbenzene, styrene, cumene and xylenes. In addition, two non-identified peaks, total other A- hydrocarbons and total other B-hydrocarbons, were reported. The A- hydrocarbons are those, such as gasoline or light alcohols, with boiling points less than that of benzene (176°F). The B-hydrocarbons are those, such as mineral spirits or petroleum naphtha, with boiling points greater than that of benzene. A copy of the analytical report is attached. The results indicate conditions on the date the samples were collected.

CITY_21MC100_003046611

NYC-WTC_000197629