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.

Limit Radon Exposure

Applications can be submitted at any time. The Agency processes Applications on a first-come, first served basis. However, the selected measurement device, the status and availability of EPA radon chambers, and other factors may require additional time when processing Applications for analytical mea  read more..

Hoarding And Housecleaning

There are clouds in the painting, of course. Almost any one of us would have included those clouds, thick with electricity and rainwater. And there is the wheat field, smudged out like an empty palm, orange beneath the storm-stricken sun. Surely, many of us would have insisted on the wheat as well.   read more..

Roofing Removal Tips

Assess weight-based rather than volume based payment for debris collection and investigate whether such systems could be efficiently linked to debris payment accounting systems. Management Comments and OIG Analysis FEMA generally concurs with all of these recommendations, but notes that the Age  read more..

Emergency Board Up_Chain Link Fence Security Optio

During a hurricane, homes may be damaged or destroyed by high winds and high waves. Debris can break windows and doors, allowing high winds inside the home. In extreme storms, such as Hurricane Andrew, the force of the wind alone can cause weak places in your home to fail. After Hurricane Andre  read more..

Lead Based Paint Removal Requirements

How did the Lead Accreditation & Certification Program begin? California's lead accreditation and certification program began in June, 1994. At that time, new childhood lead poisoning prevention legislation (codified in Health and Safety Code 105250 et seq.) required the California Department of  read more..

Tenant Right Eviction

TENANT OBLIGATIONS Sec. 34.03.120. Tenant obligations.(a) The tenant(1) shall keep that part of the premises occupied and used by the tenant as clean and safe as the condition of the premises permit;(2) shall dispose all ashes, rubbish, garbage, and Tenant Move Out Cleanup Tenant Right Eviction other waste from the dwelling unit   read more..

Grants For Asbestos Removal

Because asbestos was used so frequently and because of the dangers of asbestos it is possible to secure grants for Asbestos Abatement Grants For Asbestos Removal. Now the cannot be used in every case it only a select few will be eligible and the regulations will be different depending on which state you live in and which area of the   read more..

How To Treat Carpet Flood Damage

If the heating and air conditioning system or air ducts were flooded, use special care. The inside parts of heating and air-conditioning systems that contacted floodwater are hiding places for mold. If mold grows in the system, mold particles may get into the air and Flood Damage How To Treat Carpet Flood Damage make people sick.  read more..

How To Restore Water Damaged Electronics

Prohibited Finishes for Metal Shell Connectors, Contacts, Terminals and Terminal Lugs.Cadmium, zinc, chemically coated cadmium or zinc, or silver shall not be used as a connector or contact finish. Silver shall also not be used as an under plate, and shall not be used as a finish due to corrosion co  read more..

How To Remove Soot Stains From Stucco

In a final report in the series of non-thermal damage experiments, SNL reports on previously unpublished results including tests of conformal coatings, digital throughput, memory chips, hard disk drives, and electrical properties of fire smoke [19].2.1.7.1 Conformal Coatings In order to gauge the ab  read more..