Asbestos Project Notification and Inspection Report, Dec 2002

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< D5755 smaller components without losing its fibrous properties or 5. Significance and Use appearance. 5.1 This microvaevum sampling and indirect analysis 3.2 Oescriptlont of Terms Specific lo This Standard: method is used for the general testing of non-airbome dust 3.2.1 asj^a ratio—xbo ratio of the length of a fibrous samples for asbestos. It is used to assist in the evaluation of particle to its average width. dust that may be found on surfaces in buildings such as 3.2.2 bundle—31 structure composed of three or more ceiling tiles, shelving, electrical components, duct work, fibers in a parallel arrangement with the fibers closer than carpet, etc. This test method provides an index of the one fiber diameter to each other. concentration of asbestos structures in the dust per unit area 3.2.3 duster—A structure with fibers in a random arrange­ analyzed as derived from a quantitative TEM analysis. ment such that all fibers are intermixed and no single fiber is 5.1.1 This test method docs not describe procedures or । isolated from the group; groupings of fibers must have more techniques required to evaluate the safety or habitability of F than two points touching. buildings with asbestos-containing materials, or compliance L 3.2.4 debris—masaiais that are of an amount and size with federal, state, or local regulations or statutes. It is the | (particles greater than 1 mm in diameter) that can be visually user’s responsibility to make these determinations. . identified as to their source. S.1.2 At present, a single direct relationship between d 3.2.5 dust—my material composed of particles in a aze asbestos-containing dust and potential human exposure does range of <1 mm and large enough to settle by vinue of their not exist Accordingly, the user should consider these data in j weight from the ambient air (see definition for settleable relationship to other available information in their evalua- | paniculate matter In Test Method D 1739). non. 3.2.6 fiber—i structure having a minimum length of 0.5 5.2 This test method uses the definition, settieable partic­ pm, an aspect ratio of 5:1 or greater, and substantially ulate material, found io Test Method D 1739 as the defini­ parallel sides (4). tion of dust This definition accepts all particles small 3.2.7 fibrous—of a mineral composed of parallel, radi­ enough to pass through a 1 mm (No. 18) screen. Thus, a ating, or interlaced aggregates of fibers, from which the fibers single, large asbestos containing p^cle(s) (from the large are sometimes separable. Thal is, the crystalline aggregate end of the particle size distribution) dispersed during sample may be referred to as fibrous even if it is not composed of preparation may result in anomalously large asbestos con­ separable 'fibers, but has that distinct appearance. The term centration results in the TEM analyses of that sample. It is, fibrous is used in a general mineralogical way to describe therefore, recommended that multiple independent samples aggregates of grains that crystallize in a needle-like habit and are secured from the same area, and a minimum of three appear to be composed of fibers. Fibrous has a much more samples analyzed by the entire procedure. ( general meaning than asbestos. While it is correct that all 6. Interferences asbestos minerals are fibrous, not all minerals having fibrous habits are asbestos. 6.1 The following minerals have properties (that is, chem­ 3.2.8 indirect preparation—a method in which a sample ical or crystallioe structure) which are very similar to asbestos minerals and may interfere with the analysis by passes through one or more intermediate steps prior to final causing a false poritive to be recorded during the test filtration. Therefore, literature references for these nuterials must be 3.2.9 matrix—ai structure in which one or more fibers, or maintain^ in the laboratory for comparison to asbestos fiber bundles that are touching, are attached to, or partially minerals so that they ate not misidentified as asbestos concealed by a single particle or connected group of non- minerals. fibrous particles. The exposed fiber most meet the fiber 6.1.1 Antigorite. definition (see 3.2.6)., 6.1J Palygorskite (Attapulgite). 3X10 struaures—a term that is used to cat^orizc all the 6.1.3 Halloysite. types of asbestos particles which are recorded during the 6.1.4 Pyroxenes.. analysis (such as fibers, bundles, clusters, and matrices). 6.1.5 Sepiolite. Final results of the test are always expressed in asbestos 6.1.6 Vermiculite scrolls. structures per square centimetre. 6.1.7 Fibrous talc. 6.1,8 Hornblende and other amphiboles ether than those listed in 3.1.2. . 4. Summary of Test Method 6.2 Collecting any dust particles greater than 1 ram in size 4.1 The sample is collected by vacuuming a known in this test method may cause an interference and. therefore, surface area with a standard 2S or 37 mm ah* sampling must be avoided. cassene using a plastic tube that is attached to the inlet orifice which acts as a nozzle. The sample is transferred from 7. Materials and Equipment'. inside the cassette to an aqueous solutian of known volume. 7.1 Purity ofReagents—’BUcsaseaX. grade chemicals shall be Aliquots of the suspension are then filtered throueh a used in all tests. Unless othCTwisc indicated, it is intended membrane. A section of the membrane is prepared and that all reagents conform to the specifications of the Com­ transferred to a TEM grid using the direct transfer method. mittee on Analytical Reagents of the American Chemical I The asbestrform structures are identified, sized, and counted Society, where such specifications are available. Other grades by TEM, using SAED and EDXA at a magnification of may be used, provided it is first ascertained that the reagent I5p0Oto20 000X. is of sufficiently high purity to permit hs use without

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