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Forensic Analytical <br /> QUANTITATIVE ANALYSIS REPORT <br /> ASBESTOS IN SOIL <br /> Transmission Electron Microscopy* <br /> Kleinfelder Page: 1/2 <br /> Attn: Mr. Tony Martin Client Number: 2712 <br /> 2825 East Myrtle Street Report Number: 259666 <br /> Stockton CA 95205 Date Received: 10/04/96 <br /> Date Reported: 10/16/96 <br /> Date Collected: 10/03/96 ----------------------------------------------------------------------------- <br /> iob 1D: 20-2245-29-E01 Analyst(s): MF 1313 <br /> Site/Location: Date Analyzed: 10/10-16/96 <br /> Samule Preparation: Each sample was prepared using the quantitative <br /> le <br /> asphalt chunks were excluded from the analysis. Representative subsamplesric were we weighed, ashdhnique. Anytfor <br /> 12 hours at 480°C,and reweighed to determine the organic proportion. The ashed residues were ground <br /> in concentrated hydrochloric acid, dried,and reweighed to determine the acid-soluble component weight <br /> hcrcentage. The acidified residues were resuspended in a known volume of particle-free water and <br /> sonicated. Aliquots of each suspension were brought to >20tn1 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 /> Analytical_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 <br /> erford for large asbestos <br /> structures, followed by a high magnification analysis (-19000x) for smaller asbestos str cture. Asbestos <br /> structures were identified by morphology (Yamate Level II definitions),qualitative selected area electron <br /> j 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 /> ,volume 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 grid openings analyzed and the aliquot volume filtered for the low magnification analysis. <br /> Since a 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 /> EPA Test Method 600/R-93/116§2.5: Method for the Determination of Asbestos in Bulk Building Materials. <br /> San Francisco office: 37-' Depot Road, Suite 409, Havward,California 94545 • Telephone ;in;nu7 <br /> I n A......1 —11 _ <br />