Asbestos sampling data report, 1 Peck Slip, Oct 2001

NYC 9/11 Public Portal Document

• 107lfaddon Avenue EMSL Analytical,Inc.- 48NJ. 0008108 on 58- West

9/26/0) Attention: Chris Garber URS 200 Orchard Ridge Drive Suite 101 Gaithersburg, MD. 20878

Project-. 89- FUSPS035.02 / Peck Slip Ref. Number: 360100275

Silica Analysis Performed by X Ray Diffraction (XRD) Method NIOSH 7500 Nuisance Dust Airborne Silica Sample Sample Silica Silica % Analytical Identification Particle ID Volume Weight Cooc. Weight Cone. Silica Sensitivity Sample ID m (mg/ms m (m!J m m

Quartz 1260 0.400 0.3175 <0.004 <0.0159 N/A 0.0159 PS-4F-$1 WestArea Quartz 1260 0.140 0.1111 <0.004 <0.0159 N/A 0.0159 PS-4F-S2 East Area Elevator Quartz 1260 0.010 0.0079 <0.004 <0.0159 N/A 0.0159 PS-4F-S3 <0.004 <0.0159 N/A 0.0159 PS-4F-&4 East Wall Quarm 1260 0270 02143 Quartz 1260 0.040 0.0317 <0.004 <0.0159 WA 0.0159 PS-4F-S5 North Wall

0.030 mg Quartz 0.032 Standard Lab.Blank 0.000 mg Quartz 0.000

Bulk Analysis: Sample ID Sample Description Silica Forms Identified Bulk Not Submitted

John Newton 26 September, 2001 Analyst Date of Analysis

Disclaimer: The laboratory Can only verify the eoncennation of silica on the filter and not the final concentration due to data obtained by non-laboratory personnel In the absence ofa bulls dust sample, the specific form ofcrystalline clic, cam not be determined. Hence, alpha-quartz. the most prevalent form of crystalline silica, will be assumed = Less than the stated value the instrument The lowest reportable value is equivalent to the Anatytinl Sensitivity which is calculated from the lowest reproducible concentration of silica detectable by "A Accredited- Laboratory 1D #100192

NYC-WTC 000120343