NYC-WTC_000210722

NYC 9/11 Public Portal Document

Enviroscience TEM AIR SAMPLE RESULTS CLIENT: American Stock Exchange SAMPLE DATE: December 3,2001 Consultants, Inc. 2150 Smithtown avenue PROJECT NAME: SIAC Computer Room RECEIVED DATE: December 6,2001 Ronkonkoma, New York 1 1779 Ambient Phone:(631)580-3191 AREA: SAMPLER: L. Savaiese Facsimile: (631) 580-3195 WWW.ENVIROHEALTH.ORG CLIENT #: 01-10445 CUSTODY #: B-14-02 ELAP# 11681 NVLAP #200531-0

Sample # Sample Location Start End Run Time Flow Rate Volume Filter Cone. Sensitivity Air Cone. minutes Avg. Liters S/mm2 S/cc S/cc

TEM Al LI workshop 8:55 9:15 1460 2.14 3066 0.0 0.0016 <Sensitivity TEM A2 L2 fax/computer rack 9:22 9:18 1436 3.15 4451 0.0 0.0011 <SensitivitY TEM A3 L3 desk/console 9:50 9:20 1410 7.35 10293 0.0 0.0005 <SensitivitY TEMA4 L4AC1 10:10 10:20 1460 2.5 3066 0.0 0.0016 <SensitivitY

S=Asbestos structures,cc=cubic centimeters, nun=niillimetcr Q Analyzed Analyzed: <= less than, Flow Rate in liters per minute Samples were analyzed using Philips 400T Transmission Electron Microscope. Asbestos identification is determined by the morphology, visual Selected Area Electron Diffraction (SAED), and Elemenul Analysis using an Energy Dispersive X-ray Analyzer (EDAX).

so Concentration on the filter is calculated by taking the number of asbestos structures and dividing by the area analyzed. Air concentration is calculated by multiplying the effective filter area (EFA) by the filter concentration and then dividing by the volume of air collected in cubic centimeters (cc). The data pertaining to these calculations can be found on the Asbestos Count Sheet. o The air filter concentration relates only to air fiber content. When samples are submitted by an outside agency for analysis, Enviroscience. can only guarantee the Io o accuracy of the filter concentration. This report may not be reproduced without the express permission of Enviroscience. This report can not be used to claim endorsement of products by NVLAP or any agency of the U.S. Government. CO on The samples collected in the response action area demonstrated a filter concentration of asbestos less than seventy structures per square millimeter. This response o action is considered complete according to EPA 40 CFR 763. co A result of zero structures per square millimeter is only applicable to the area analyzed. Test results only reflect conditions at the time samples were Uken.

NYC-WTC_000210722