NYC-WTC_000226988

NYC 9/11 Public Portal Document

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

January 28, 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 Silica Dust Stujwesant 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 silica-containing dust conducted on December 10, 2001 and January 4 and 9, 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

On each day, ATC collected twelve (12) samples for respirable dust using pre-weighed 37nun PVC filters connected to size-selective cyclones to remove the larger (non-respirable) particles prior to deposition on the filters. Eleven (11) samples were collected indoors and one (1) was collected outdoors. The samples, plus one blank filter for each day, were sent to PSC Analytical Services, Inc., an American Industrial Hygiene Association accredited laboratory in Reading, PA. Analysis for silica was performed by x-ray diffraction according to NIOSH Method 7500. Copies of the analytical reports are attached.

The sampling locations were:

December 7: 1** floor hallway Main Entrance, 2“* floor hallway, 2“* floor hallway by Room C232, 3'^'^ floor hallway. Pool, Auditorium, 3rd floor Gymnasium, Cafeteria, Sth floor Room 501 East, Room 402 South, Room 351 North, outdoors (North).

January 4: 1st floor lobby Main Entrance, 1“ floor hallway by Custodian Office (West), 2“* floor lobby. Pool, Auditorium, 3rd floor Gymnasium, Dining Room 5®* floor. Room 513 South, Room 638 North, Room 701 East, 10“' floor hallway center, outdoors (entrance).

January 9: 1st floor lobby, Room 129 South, 2"“^ floor lobby. Pool, Auditorium, Room 260 East, 3^ floor Gymnasium, Dining Room 5* floor, 8* floor hallway by Room 815, 9“* floor hallway by Room 911, Room 1006 North, outdoors (North).

CITY_21MC100_002896985

NYC-WTC_000226988