Chain of custody form, 90 Church Street, Nov 2001

NYC 9/11 Public Portal Document

RJ LeeGroup, Inc. 3WHochbergRoad Monroeville,PA1S146 Voice 724/325-1fl6 Fax 724/733.1799 • LABORATORY REPORT

Emteque REPORT DATE October 19, 2001 505 8th Avenue, Suite 900 SAMPLES RECEIVED October 15, 2001 New York, NY 10018 RJ LEE GROUP JOB NO. XR.H310131 ATTENTION: Mr. Nell Feldscher CLIENT JOB NO. 01049690 Church St. TELEPHONE: (212)631-9000 PURCHASE ORDER NO. N/A Table 1 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 (CaF2) 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/IITRI TY27 tridymite mixed with CaF2. 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 Crlstoballte Tridymite Crystalline Silica Detection Client LD. RJ Lee Group (Weight %) (Weight %) (Weight %) (Weight %) Limit

512-01 0340771 4.9 * 4.9 02 S12-02 0340772 5.7 * * 5.7 02 S12-03 0340773 1.1 * * 1.1 0.2 • 512-04 0340774 1.8 * * 1.8 0.2 511-01 0340775 2.3 * * 2.3 0.2 511-02 0340776 1.3 * * 1.3 0.2 511-03 0340771 1.9 * * 1.9 0.2 S11-04 0340778 2.5 * * 2.5 0.2 510-01 0340779 8.2 * * &2 0.2 S10-02 0340780 1.4 * * 1.4 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 RJ La Group's current terms and conditions ofsale, indnding the company's standard warranty and limitation of liability provisions. No responslbilihf or liability Is assumedfor the manner in which the results are used or interpreted. Unless notified in writing to return the samples covered by this report, RI Lee Group will store the samplesfor a period of thirty (30) days before discarding. A shippingand handlingfee will be assessedfor the return of anysamples.

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NYC-WTC 000124653