Asbestos Project Notification and Inspection Report, Dec 2002

NYC 9/11 Public Portal Document 0 D575S

smaller components without losing its fibrous properties or 5. Significance and Use appearance. 5.1 This microvacvwm sampling and indirect analysis 3J Descriptions of Terms Specific to This Standard: method is used for the general testing of non>aiiborne dust 3.2.1 aspea ratio—tite ratio of the length of a fibrous samples for asbestos. It is used to assist in the cvaluauon of particle to its average width. dust that may be found on surfaces in buildings such as 3.2.2 bundle—i structure composed of three or more ceiling tiles, shelving, electrical components, duct work, fibers in a parallel arrangement with the fibers doser than carpet, etc. This test method provides an index of the one fiber diameter to each other. concentrarion of asbestos structures tn the dust per unit area 3.2J clutter—a. structure with fibers in a random arrange­ analyzed as derived from a quantitative TEM analysis. ment such that bH fibers are intermixed and ne single fiber is 5.1.1 ■nHs test method doa not de^be ires or isolated from the group; groupings of fibers must have more than two points touching. buildings with asbestos-containing materials, or compliance 3X4 sf^rtr—materials that are of an amount and size ■4th qftte, pr Iggi r.»Eulations "r ftatirer- tt K ibt (partides t cater than 1 mm in diameter) that can be visually user’s responsibility to make thcsetictepgrinatiCBre _ , identified as to their source. 5.1.2 At piescnt, a singlc direct lelationship between 3X5 dust—my material composed of p- tides in a size asbeStofrcantainiugdtstaiid^poiai^homanexpQaitcdoes range of <1 mm and large enough to settle by virtue of their weight from the ambient air (see definition for settleable relationship to other available information in their evalua­ particulate matter in Test Method D1739). tion. 3X6 fiber—i structure having a minimum length of 03 5.2 This test method uses the definition, senleable parti^ gm, an aspea ratio of 5:1 or greater, and substantially Ulate materia], found in Test Method D 1739 w the defini­ parallel rides (4). tion of dust This definition accepts all pattides small 32.7 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, firom which tire fibers single, large asbestos containing pvtidefs) (fiom the large are sometimes separable. That is, tire crystalline aggregate end of the partide 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 tqrpearance. The tom centration results in the TEM analyses of that sample. It is, fibrous is used in a general mineraloid way to describe therefore, recommended that multiple independent samples aggregates of grains that crystallize in a needle-like habit and are seeing from the sqme area, and a nuuimum of three appear to be composed of fibers. Hfarous 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 ha'ring fibrous habits are asbestos. 6.1 The following minerals have properties (that is. chem­ 3X8 indirect preparation—a method in which a sample ical or crystalline structure) which are very similar to passes through one or more intermediate steps prior to final asbestos minerals and may interfere with the analysis by filtration. causing a false positive to be recorded durmg the test. Therefore, literature references for these materials must be 3X9 matrix—a 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 ore not misidentified as asbestos concealed by a angle particle or connected group of non- minerals. fibrous partides. The exposed fiber must meet the fiber 6.1.1 Antigortie. definition (see 3X6).. 6.U fabiorddte (Attapulgite), 3X10 Struertiras—^atermthatisusedtocategoiizeallthe 6.1 J Halloysite. types of asbestos partides which are recorded during the 6.1.4 Pyroxenes.. analysis (such as fibers, bundles, clusters, and matrices). 6.1.5 Sq^te. FSaal results of the test are always expressed in asbestos 6.1.6 Vermiculite scrolls. structures per square centimetre. 6.1.1 Fibrous u^c. 6.1.8 Hornblende and other amphiboles other than tiiose listed in 3.1J, . 4. Sunnaary of Test Method 6J Collecting any dust partides greater than 1 mm in size 4.1 The fimplc is collected by vacuuming a known io this test mcthcxl may cause an interference and, therefore, surface area with a standard 25 or 37 mm air sampling must be avoided. cassette using a plastic tube that is attached to the inlet ori^ which acts as a nozzle. The sample is transferred from 7. Materials and EqtqpmaBt . inside the cassette to an aqueous solution of known volume. 7.1 furUy o/AeagfiTits—Reagent grade chemicals shall be Aliquots of the suspensioa are then filtered through a used in all tests. Unless others^ indieated, it is intended membrane. A section of die membrane is jmqpared and that all reagents cOh'- . to the specifications of the Com­ . ■ transferred to a TEM grid uring the direct tranter method. mittee on AnalytLal Reagents of the American Chemical s.,.- The asbestiform structures are identified, sized, and counted Sodeiy, where such spedficarions are available^ Other grades by TEM, using SAED and 'OXA at a magnification of may he used, provided it is fiist ascertained that the reagent I5p00io20000X. is of sufiiciendy high purity to permit its use without

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