NYC-WTC_000232459

NYC 9/11 Public Portal Document

I I Warren & Panzer Engineers, P.C. 228 East 45th Street New York, New York 10017 Tel. (212) 922-0077 Fax (212) 922-063Q October 17,2001 I Mr. Alex Lempert New York City School Construction Authority___ I 30-30 Thomson Avenue Longlsland City, NY 11101

I Re; PS 234 Manhattan

I Dear Mi. Lempert:

I On October 4, and October 16, 2001, Warren & Panzer Engineers, P.C. conducted aggressive transmission electron microscopy (TEM) air sampling in the basement, 1^ floor, 2"'’ floor, 3'”'^ floor, and penthouse mechanical room of PS 234. Prior to any air

I sampling, walls, floors, and ceilings were leaf blown with the ventilation system on.

With the ventilation system in operation, five TEM air samples were collected per floor-.

I Two additional samples per floor were collected by a third party consultant (Taylor Environmental Group) for quality control / quality assurance.

I TEM analysis was performed in accordance with Appendix A of Subpart E of 40 CFR 763 by ATC Associates and EMSL on October 4 and October 16, 2001.

I Enclosed are TEM laboratory results for the basement, penthouse, mechanical room. floor, 2"’* floor, 3^^ floor, and

I Sincerely,. Warren & Panzer Engineers, P.O. I Fabio Pedone I Project Manager

Enc. I

I X Member of The Warren & Panzer Group

CITY_21MC100_010238162

NYC-WTC_000232459