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Forensic Analytical <br /> QUANTITATIVE ANALYSIS REPORT <br /> ASBESTOS IN SOIL <br /> Transmission Electron Microscopy* <br /> Page: 1/2 <br /> Kleinfelder Client Number: 2712 <br /> Attn: Mr. Tony Martin Report Number: 259667 <br /> 2825 East Myrtle Street Date Received: 10/04/96 <br /> Stockton CA 95205 Date Reported: 10/18/96 <br /> ------------------------------------------------------------------------------------------------------------ <br /> Date Collected: 10/03/96 Analyst(s): MF,BB <br /> Job ID: 20-2245-29-E01 Date Analyzed: 10/16-18/96 <br /> Site/Location: <br /> Sample Preparation: Each sample was prepared using the quantitative gravimetric technique. Any visible <br /> asphalt chunks were excluded from the analysis. Representative subsamples were weighed, ashed for <br /> >12 hours at 480"C,and reweighed to determine the organic proportion. The ashed residues were ground <br /> in concentrated hydrochloric acid, dried, arid reweighed to determine the acid-soluble component weight <br /> ' percentage. The acidified residues were resuspended in a known volume of particle-free water and <br /> sonicated. Aliquots of each suspension were brought to >20ml and filtered through 0.22um pore-size <br /> mixed cellulose ester (MCE) membranes. After air drying, these membranes were collapsed, etched, <br /> carbon-coated, and mounted on 200-mesh TEM grids. <br /> Anal tical Method: The analysis was performed on a Philips CM12 or Hitachi H600AB TEM at 100kV <br /> -- accelerating voltage. An extended low magnification analysis (-2500x) was performed for large asbestos <br /> Structures, followed by a high magnification analysis (-19000x) for smaller asbestos structures. Asbestos <br /> structures were identified by morphology (Yamate Level II definitions), qualitative selected area electron <br /> diffraction (SAED), and energy dispersive x-ray analysis (EDX). In addition, the length and diameter of <br /> each asbestos structure were recorded. <br /> Data Reduction: The asbestos concentration in each sample was calculated by first determining the <br /> V OILline of each asbestos structure counted and using magnification and density conversion factors to <br /> determine asbestos mass. The mass detected in the high magnification analysis was then normalized to <br /> the number of Krid openings analyzed and the aliquot volume filtered for the low magnification analysis. <br /> Sincea known residue mass was passed through a known filter area, and the filter area analyzed is <br /> known, the normalized asbestos mass in the residue can be determined, and then back-calculated to <br /> weight percent asbestos in the original sample. <br /> i <br /> EPA Test Method 600/R-93/116§2.5: Method for the Determination of Asbestos in Bulk Building Materials. <br /> San Francisco Office: 3177 Depot Road,Suite 409, Hay��ard,California 94545 • Telephone: 510,887-8828 800/827-FASI Fax: 510/88'-4218 <br /> Los Angeles Office: 2959 Pacific Commerce Drive Ran(ho Dominvuez California 90221 • Telephone- 310/762-)'17e r, ­­ ,,, <br />