NYC-WTC_000199448

NYC 9/11 Public Portal Document

(YflTC 104 East 25th St., 10th Fl New York, New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES INC.

September 16, 2002

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

Re: Air Sampling for Hydrocarbons DeSoto School / PS. 130M ATC Project No. 15-19125-0345

Dear Mr. Orlan:

ATC Associates, Inc. (ATC) is pleased to provide this report of the results of air sampling for hydrocarbon compounds conducted on August 26, 2002, at the referenced school. The New York City Department of Education (DOE) requested this sampling to ensure acceptable lAQ level in the school building.

Scope of Work

ATC collected three (3) samples for hydrocarbon compounds (HC) at specified locations. 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. All samples were collected inside the building. 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 cltromatography/flame ionization detection (OSHA Method 7).

Mr.Tenzin Namgyal and Mr. 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 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.

CITY_21MC100_003034057

NYC-WTC_000199448