NYC-WTC_000201820

NYC 9/11 Public Portal Document

104 East 25th St., 10th Floor New York. New York 10010 , www.atc-enviro.com - 212.353.8280 Fax 212.353.8306 ASS O C I A T E S I N C .

March 5, 2002 N.Y.C. Board of Education 28-11 Queens ■ Plaza North 14584-0819 Long, Island City, NY 11101

Attn: Mr; Bernard/ Orlan ■

Re: Report of TEM Analysis Dear Mr. Orlan:

Following are the results of transmission electron microscopy (TEM) analysis of air samples from our Group No. 6939:

Project Name: P.S.;89M,201WarrenStreet,NY,Ny- Location: 'All Floors, Playground/ Roof, 1st rFloor Hallway Samples received: .03/05/02

These results will confirm and document the data transmitted today to-Mr. Mark Terjesen, -Project Manager, of our office. The analyses were performed in strict conformance with the me-thodology of the AlHERA Final -Rule (40 CFR Part 763, Appendix A to Subpart E, October 30, 1987) for’clearance -of abatement sites.

The results of the' sample analyses are as indicated on the attached document.

Copies of the bench sheets are also included as stipulated by AHERA. MMI TEM cassettes, Lot No. 00263916, were used. / Results reported as Struct/cc are a function of air volume collectedin/the / field and are, as such, not verifiable by this laboratory. /This report may be reproduced only in its entirety and not'Without prior permission of this laboratory. If /post-abatement 'inside samples pass, the response action .may be considered to have been completed. . , The analyses were - supervised by Dr/ Michael A. Gorycki, Director of '/ Ele-otron Microscopy .; / / ;; ■ / / // / ;,/ ; / / ( We - are' pleased to i note/ that 'our TEM lab has received/ full accreditation from NVLAP, as is currently required for 'recognized analysis of TEM air samples for AHSRA proj'ects,' and also approval under the NY State DOH ELAP- program. //These analyses were performed by ATC d/b/a ATC Associates Tnc. Please contactme regarding any questions relating bo these materials. // -;/ /

Very truly yours,

Michael A. Gorycki, Ph.D. /Director of Electron Microscopy

CITY_21MC100_003269178

NYC-WTC_000201820