Asbestos Abatement >> Asbestos Removal Specifications In Tennessee

Counting Fibers (1) Place the prepared sample slide on the mechanical stage of the microscope. Position the center of the wedge under the objective lens and focus upon the sample. (2) Start counting from one end of the wedge and Asbestos Removal Specifications In Tennessee progress along a radial line to the other end (count in either direction from perimeter to wedge tip). 

Select fields randomly, without looking into the eyepieces, by slightly advancing the slide in one direction with the mechanical stage control. (3) Continually scan over a range of local planes (generally the upper 10 to 15 um of the filter surface) with the fine focus control during Asbestos Removal Specifications In Tennessee each field count. Spend at least 5 to 15 seconds per field. 

Most samples will contain asbestos fibers with fiber diameters less than 1 um. Look carefully for faint fiber images. The small diameter fibers will be very hard to see. However, Asbestos Removal Specifications In Tennessee they are an important contribution to the total count. (5) Count only fibers equal to or longer than 5 um. Measure the length of curved fibers along the curve. 

Count fibers which have a length to width ratio of 3:1 or greater. (7) Count all the fibers in at least 20 fields. Continue counting until either 100 fibers are counted or 100 fields have been viewed; whichever occurs first. Count all the fibers in the final field. (8) Fibers lying entirely within the boundary of the Walton-Beckett graticule field shall receive a count of Asbestos Removal Specifications In Tennessee.

Fibers crossing the boundary once, having one end within the circle shall receive a count of 1/2. Do not count any fiber that crosses the graticule boundary more than once. Reject and do not count any other fibers even though Asbestos Removal Specifications In Tennessee they may be visible outside the graticule area. If a fiber touches the circle, it is considered to cross the line. 

Count bundles of fibers as one fiber unless individual fibers can be clearly identified and each individual fiber is clearly not connected to another counted fiber. See Figure 1 for counting conventions. (10) Record the number of fibers in each field in a consistent way such that filter non-uniformity can be assessed. (11) Regularly check Asbestos Removal Specifications In Tennessee phase ring alignment. 

When an agglomerate (mass of material) covers more than 25% of the field of view, reject the field and select another. Do not include it in the number of fields counted. (13) Perform a "blind recount" of 1 in every 10 filter wedges (slides). Re-label the slides using a person other than the original Asbestos Removal Specifications In Tennessee counter. 6.7. Fiber Identification 

As previously mentioned in Section 1.3., PCM does not provide positive confirmation of asbestos fibers. Alternate differential counting techniques should be used if discrimination is desirable. Differential Asbestos Removal Specifications In Tennessee counting may include primary discrimination based on morphology.

Polarized light analysis of fibers, or modification of PCM data by Scanning Electron or Transmission Electron Microscopy. A great deal of experience is required to routinely and correctly perform differential counting. It is discouraged unless it is legally necessary. Then, only if a fiber is obviously not asbestos should it be excluded from the Asbestos Removal Specifications In Tennessee count. 

Further discussion of this technique can be found in reference 8.10. If there is a question whether a fiber is asbestos or not, follow the rule: "WHEN IN DOUBT, COUNT." 6.8. Analytical Asbestos Removal Specifications In Tennessee Recommendations -- Quality Control System 6.8.1. 

All individuals performing asbestos analysis must have taken the NIOSH course for sampling and evaluating airborne asbestos or an equivalent course. 6.8.2. Each laboratory engaged in asbestos counting shall set up a slide trading arrangement with at least two other laboratories in order to compare performance Asbestos Removal Specifications In Tennessee and eliminate inbreeding of error. 

The slide exchange occurs at least semiannually. The round robin results shall be posted where all analysts can view individual analyst's results. 6.8.3. Each laboratory engaged in asbestos counting shall participate in the Proficiency Analytical Testing Program, the Asbestos Analyst Registry or equivalent. 
Each analyst shall select Asbestos Removal Specifications In Tennessee and count prepared slides from a "slide bank". 

These are quality assurance counts. The slide bank shall be prepared using uniformly distributed samples taken from the workload. Fiber densities should cover the entire range routinely analyzed by the laboratory. These Asbestos Removal Specifications In Tennessee slides are counted blind by all counters to establish an original standard deviation. This historical distribution is compared with the quality assurance counts. 

A counter must have 95% of all quality control samples counted within three standard deviations of the historical mean. This count is then integrated into a new historical mean and standard deviation for the slide. The Asbestos Removal Specifications In Tennessee analyses done by the counters to establish the slide bank may be used for an interim quality control program if the data are treated in a proper statistical fashion.  

CALCULATIONS Calculate the estimated airborne asbestos fiber concentration on the filter sample using the following formula: Where: AC = Airborne fiber concentration (For Equation A, ) FB = Total number of fibers greater than 5 um counted FL = Total number of fields counted on the filter BFB = Total number of fibers greater than 5 um counted in the blank BFL = 

Total number of fields counted on the blank ECA = Effective collecting area of filter (385 mm(2) nominal for a 25-mm filter.) FR = Pump flow rate (L/min) MFA = Microscope count field area (mm(2)). This Asbestos Removal Specifications In Tennessee is 0.00785 mm(2) for a Walton-Beckett Graticule. 

T = Sample collection time (min) 1,000 = Conversion of L to cc Note: The collection area of a filter is seldom equal to 385 mm(2). It is appropriate for laboratories to routinely monitor the exact diameter using an inside micrometer. The collection area is calculated according to the Asbestos Removal Specifications In Tennessee formula: 

Short-cut Calculation Since a given analyst always has the same interpupillary distance, the number of fields per filter for a particular analyst will remain constant for a given size filter. The field size for that analyst is constant (i.e. the Asbestos Removal Specifications In Tennessee analyst is using an assigned microscope and is not changing the reticle). 

For example, if the exposed area of the filter is always 385 mm(2) and the size of the field is always 0.00785 mm(2), the number of fields per filter will always be 49,000. In addition it is necessary to convert liters of air to cc. 
These three constants can then be combined such that Asbestos Removal Specifications In Tennessee. 

The previous equation simplifies to: (For Equation B, ) 7.3. Recount Calculations As mentioned in step 13 of Section 6.6.2., a "blind recount" of 10% of the slides is performed. In all Asbestos Removal Specifications In Tennessee cases, differences will be observed between the first and second counts of the same filter wedge. 

Most of these differences will be due to chance alone, that is, due to the random variability (precision) of the count method. Statistical recount  criteria enables one to decide whether observed differences can be explained due to chance alone or are probably due to systematic differences between Asbestos Removal Specifications In Tennessee analysts, microscopes, or other biasing factors.

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