Chain of custody form, 90 Church Street, Nov 2001

NYC 9/11 Public Portal Document

RJ LeeGroup, Inc. 350 Hochberg Road Monrcev 1 PA 15146 Vohx724/325-1776 Fax724/733.1799 • LABORATORY REPORT

Emteque REPORT DATE October 19,2001 50581k Avenue, Suite 900 SAMPLES RECEIVED October 15, 2001 New York, NY 10018 RJ LEE GROUP JOB NO. XRH1IM31 ATTENTION: Mr. Neil Eeldacher CLIENT JOB NO. 01049690 Church St. TELEPHONE: (212)631-9000 PURCHASE ORDER NO. N/A Table 3 of 3

ANALYSIS: Bulk Analysis Of Crystalline Free Silica METHODS: X - ray Diffraction

A portion of each bulk sample was ground to a fine powder, mixed with calcium fluoride (CaP2) as an internal standard, ground further, and backloaded into a standard XRD holder. The samples were then scanned using standard run parameters on a Philips XRD unit, equipped with graphite mono- chromatized copper radiation. The weight percentage of silica was calculated through the use of the internal standard and calibration coefficients derived from standards NBS -1878 quartz, NBS -1879 cristobalite, and NIOSH/ITTRI TY27 tridymite mixed with CaFs. Samples weighing < 0.1 grams were deposited onto a silver membrane filter and analyzed according to a modified NIOSH 7500 method.

Total Sample Identification Quartz Cristobalite Tiddymite Crystalline Silica Detection Client I.D. RJ Lee Group (Weight %) (Weight %) (Weight %) (Weight %) Limit

S8-05 0340791 1.8 * * 1.8 0.2 56-01 0340792 12.0 * * 12.0 0.2 S6-02 0340793 1.7 * 1.7 0.2 • 56-03 0340794 1.6 * 1.6 0.2 S6-04 0340795 1.9 * * 1.9 0.2 57-01 0340796 3.1 * * 3.1 0.2 57-02 0340797 4.9 * * 4.9 0.2 57-03 0340798 3.8 * * 3.8 0.2 S7-04 0340799 3.5 * * 3.5 0.2 S5-01 0340800 3.9 * 3.9 0.2 S5-02 0340801 1.4 * * 1.4 0.2 55.03 0340802 2.5 * 2.5 0.2 S5-04 0340803 1.1 * * 1.1 0.2

*No cristobalite or tridymite detected (<0.2 wt. % detection limit).

Stephen A. Brown Date Manager, X-ray Diffraction Group

• These results are submitted pursuant to Rf Lee Group's current terms and conditions safe, including the company's standard warrantyand limitation cf liability provisions. No responsibility or of

liability is assumedfor the manner in which the results are used or interpreted Unless notyied in writing to return the samples covered by this report RI Lee Group will store thesampfesfora period of thirty (30) days before discarding. A shipping and handlingfee will be assessedfor the return of any samples.

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