NYC-WTC_000208286

NYC 9/11 Public Portal Document

104 East 25th St.. iC New York, New York h www.atc-env ro 212.353.1 Fax 212.353.E ASSOCIATES INC.

September !9, 2002

Mr. Bernard P. Orlan Director, Environmental Health and Safety New York City Department of Education 2S-11 Queens Plaza North Long Island City. NY 11101

Re: Air Sampling for Hydrocarbons Murray Bergtraum High School (M520) ATC Project No. 15-19125-0351

Dear Mr. Orlan:

ATC Associates Inc. (.ATC) is pleased to provide this report of the results of air sampling for hydrocarbon compounds conducted on September 11, 2002, at the referenced school. The New York City Department of Education (DOE) requested this sampling to verify that acceptable indoor air quality is being maintained.

Scope of Work

ATC collected three (3) samples for hydrocarbon compounds (EIC) at specified locations. Samples were collected for ten (10) hours using activated coconut shell charcoal tubes connected to battery-poweied sampling pumps at a flow rate of 0.2 liters per minute. Pumps were calibrated before and after each sampling period. One blank tube was also submitted. The samples were sent to PSC Analytical Services. Inc., an American Industrial Hygiene Association-accredited laboratory tn Reading, PA. Analysis was performed by capillary gas chromatography/flame ionization detection (OSHA Method 7).

I’enzin Namgyal, Industrial Hygienist, and Sonny Ramlal. Environmental Technician, from ATC’s New York City office, conducted the sampling 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 chlorofoiTn, benzene, 1,2-dichloroetl ane, trichloroethylene, toluene, perchloroetyhylene (tetrachloroethylene), chlorobenzene, ethylbenzene, styrene, cumene and xylenes. In addition, two non-identified peaks, total o her 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“"). 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 laboratory report is attached.

CITY_21MC100_003021486

NYC-WTC_000208286