Air sampling report for hydrocarbon compounds, Feb 2002

NYC 9/11 Public Portal Document

104 East 25th St New York. New York 10010 www.3tc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES INC.

February 11, 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 letter report of air sampling for hydrocarbon compounds conducted on January 30, 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.

ATC collected three (3) samples for hydrocarbon compounds (HC) at specified locations. Samples were collected for a minimum of eight (8) hours using activated coconut shell charcoal tubes coimected 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 on each day. 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- 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 (176T). The B-hydrocarbons are those, such as mineral spirits or petroleum naphtha, with boiling points greater than that of benzene. Copies of the analytical reports are attached

The sampling locations were specified by the parent’s association consultant. They were the T‘ floor lobby, 2”^ floor bridge entrance hallway and the roof.

The only compound present above the detection limit was chloroform which was detected in both indoor samples. The concentrations were 0.049 parts per million (ppm) in the Main Lobby and 0.14 ppm at the 2"‘’ floor bridge entrance. It was not detected in the roof sample.

CONFIDENTIAL, CITY_21MC100_003429196 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175016