NYC-WTC_000227053

NYC 9/11 Public Portal Document

104 East 25th St.. 10th Floor

▼ATC New York, New York 10010 R www.atc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES IWC.

June 19,2002

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 Hydrocarboms High School of Economics and Finance (833M) ATC Project No. 15-19125-0291

Dear Mr, Orlan:

ATC Associates, Inc. (ATC) is pleased to provide this letter report of air sampling for hydrocarbon compounds conducted on March 9, 2002, at the referenced school. The New York City Board of Education (BOE) requested this sampling to evaluate possible contamination in the school building.

Scope offWork

ATC collected four (4) samples for hydrocarbon compounds (HC) at locations throughout the building. Samples were collected for a minimum of ten (10) 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. Three (3) samples were collected inside the building and one (1) was collected outside. 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).

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 hydrocarbon.s and total other B hydrocarbons, were reported. The total other A-hydrocarbons are those, such as gasoline or light alcohols, with boiling points less than that of benzene (176°F). The total other B-hydrocarbons (TOBHC) 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 sampling locations were: Outdoors on the roof, 1® floor lobby, 5* floor elevator lobby, and lO"’ floor staircase B.

NYC-WTC_000227053 CITY_21MC100_002923910