2 shared non-person entities · 1 shared topics · similarity 0.937
machine-extracted · confidence unavailable · Check page ↗Document / 12 pages
Asbestos removal evaluation lab report, schools
Machine-extracted title · confidence 95%A twelve-page laboratory report evaluating methods for removing asbestos fibers from school buildings.
NYC-WTC_000144612–000144623Folder label: “SCHOOLS”
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NYC 9/11 Public Portal Document of ; . Oa: Settled Asbestos Dnsy. Sempling, + Analy sis ¢ 1%9 4] Sanes Rm: ilefle 4} Shee A, Hays CRO Pract APPENDIX 4 Methods for the Analysis of Carpet Samples for Asbestos James R, Millette, Ph.D PJ. Clark.® Kim A. Bracket, Ph.D© and R.K. KEY WORDS Asbestos, Transmission Electron Microscopy (TEM), Carpeting. Ultrasonic Treatment, Microvacaum | Assessing asbestos fiber contamination in a caspet is complicated by the nature of the carpeting —because of the pile's rough surface and thickness, ; samples cannot be collected directly from carpet for analysis by TEM. Two \ indirect methods are currently used by laboratories when preparing samples ! for measuring the amount of asbestos present in carpet material. One is an ulurasonic shaking technique which requires that a portion of the carpel be €ut out and sent to the laboratory. The other is a micro-vacuuming tech- nique which has been used generally in dee assessment of asbestos in settled dust in buildings. i is not destructive to the carpel. Both methods utilize TEM to identify, measure and count the asbestos fibers found. Each can provide important but different information when an assessment of the level of contamination of carpeting is being made. The ultrasonic shaking (bulk- carpet sonication) technique gives an index of the asbestos containment throughout the entire carpet piece and the micro-vacuuming technique gives an index of the readily releasable asbestos fiber from the carpet surface, A major concem in buildings thai contain asbestos-containing material (ACM) Is the extent to which the carpet may serve as a reservoir of asbestos fibers that have been reteased from the ACM by one mechanism or another. | 141 NYC-WTC_000144618
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NYC-WTC_000144618Source: NYC Law Department, mirrored locally
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