Chain of custody form header, DEP Bureau of Air Noise

NYC 9/11 Public Portal Document

MRY-10-2002 10:25 P.00/13 BULK asbestos AxNaLYSIS RESULTS PLM .Analysis Methodologv

The samples were analyzed by industry accepted methods in accordunce with EPA and ELAP methods using Polarized Light Microscopy (PLM) with dispersion staining in conjunction with stereoscopical analysis. Point counts ar? performed on samples regulated by these agenci^.s, Th? Envifonmertcal Laboratory Approval Program ffiLAP) has determined that analysis of aon-lfiable organically bound materials (La. floor tile, roofing, etc.) is not reliable when performed by Polarized Light Microscopy (PLM) method. Therefore, if this analysis included that of non-friable materials under PLM and the results were negative, ATC must add this disclaimer to maintain Our ELAP accreditation: “Polarized light microscopy is not consistently reliable in detecting asbestos in floor coverings and similar non- friable organically bound materials. Quantitative Transmission Electron Microscopy is currently die only method that can be used co determine if this material can be considered or treated as aon-asbastos containing". Sampte.s that are layered and analyzed by the gravimetric method as composites (NESHAP, AHES-AJ should be considered positive If results (tre between trace and 1 %, unless every layer is analyzed separately.

EPA does not regulate mixed mineral assemblage like tire amhophyllite-talc intergrowth that is found in paint and caulking unless these materials contain asbestos in an amount greater than 1%. Anthophyllite detected in paint and caulking samples might be a talc intergrowth.

ATC has the capability of purt'orming TEM cottfinnation if so desired.

Al! bulk sample reports are checked and reviewed two times. Unused portions of samples are archived for tivee months unless client requests special handling. This reportmust not ba used by the ciienr to claim product endorsement by NIST or any agency of die U.S. government.

ATC .Associates Inc. is not responsible for sample collection and analytical procedures not perfonned by pur laboratory. This report may not be reproduced in part without the laboratory permission.

ATC Associates will not be liable for analytical results from samples that are not prepared according to the standard methods (EPA, ELAP. etc.) used by the laboratory (e.g. composite samples frotil different locations, samples with insuEcicnt volumes, straight TEM samples without gravimetric procedures, add dust samples).

LafaorntoA' Eouinment

LaboraCOry analysis was accomplished utilizing Olympus BH-2 Microscopes,

Quality Control

ATC Associates Inc. is accredited by NVLAP (Lab Code 1147-00) and NY Stare DOH ELaP (Lab ID 10879) for bulk and air fiber analyses. ATC participates in the Sulk Asbestos Sample Quality Assurance Programs for NVLAP and ELAP and maintains an in-house QC/QA program for bulk samples whereby 10% of all submitted samples are reanalyzed and documented in a Quality Control Manual. ATC also participates in a quarterly round robin QC/QA program for bulk samples with several accredited laboratories throughout rlw United States. Current and past QC/Q A program results are available in the luborotory for inspection.

Accuracy and Precision

The phase abundances provided by point count may be considered within the limits of variabilicy inherant m the method employed. The sample results are accurate to within +/’5« 10 percent measured by the calibrated visual egtitnare method. For point counts Uw detection limit of 0.25% is based on one asbestos point counted over dOO non-empty points. If <1 point counted and asbestos is detected, a trace result will be reported Trace is < t% ACM.

The analyses were supervised by Milena Lowd, Director of Laboratory Services, who has e-xiensive experience in asbestos analysis by PLM and other methods. Please contact me regarding any questions relating to these materials at 212-353.8280 Ext. 247.

Sincerely,

4dilanii B. Lowd Director of Laboratory Sa-vic^s

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