NYC 9/11 Public Portal Document
• 107Haddon Avenue
EMSL Analytical,Inc.- Westmont,NJ. 08108
(856)858-4800
Attention: Chris Gerber 9/28/01
URS
200 Orchard Ridge Drive
Suite 101
Gaithersburg, MD. 20878
Project: #89FUSPS035/ Peck Slip Station
Ref. Number: 360100266
Silica Analysis Performed by
X-Ray Diffraction (XRD)
Method NIOSH 7500
Nuisance Dust Airborne Silica
Sample ID Identification Particle lb Volume
Sample
P
Weight
Sample
P
Cone.
Silica
Weight
Silica
Cone I %
Silica I Analytical
Sensitivity
3P6S6 Quartz 900 0.320 0.3556 <0.004
3P7S7 <0.0222 N/A 0.0222
Quartz 900 0290 0.3222 <0.004 <0.0222 WA 0.0222
3PBS8 Quartz 900 0270 0.3000 <0.004 <0.0222 N/A 0.0222
3P989 Quartz 900 0.250 0.2778 <0.004 <0.0222 N/A 0.0222
3PIOS10 Quartz 900 0.150 0.1667 <0.004 <0.0222 N/A 0.0222
Std. #3 0.008 mg Quartz 0.000
Bulk Analysis: Sample ID
Bulk Not
Sample Description
Submitted
I Silica Forms Identified
M. Vargas & J,Newton 28 September. 2001
Analyst Dare of Analysis
Disclaimer: The laboratory can only verify the concentration of silica on the filter and not the
non-laboratory pers0enel. to the absence ofa bulk dust sample, the specific fall coecenntion due to data obtained by
font ofctystnlline silica can not be determined.
Huroc, eipbaquanz the most prevalent form of crystalline silica , Ml be assumed
NYC-WTC 000120342
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