Collecting Samples and Assessing Results

If you are using Logan to analyze air sampling results, you must have a sampling strategy that produces statistically significant results (e.g. more than six samples over a period of time). Once you have the results, you can assess them to find out whether you need to use Logan to analyze the data.

Find out which class the material you are sampling belongs to. For information on classifying materials, see How Logan Suggests Resample Frequencies.
For the initial sampling, collect at least six air samples. Any fewer than six samples creates statistical uncertainty for Logan analysis. If possible, collect the samples over a period of at least three different days or shifts. If sampling is done by a batch process limited to fewer than three days or shifts, you can still proceed with Logan analysis.
Obtain the results of laboratory analysis of the samples, and assess the results in terms of the EL for the material. If the results show that two or more initial samples are greater than or equal to the EL for the material, you must take immediate corrective action to protect employees in the workplace.

To determine whether you should use Logan to conduct an analysis of your initial sampling results:

% of results less than one-tenth the EL:	Take the following action(s):
less than 50%	Use Logan.
more than 50% of 6, 7, or 8 samples	Reassess the results to find out whether all the results are less than one-tenth the EL. If all results are less than one-tenth the EL, the risk of exposure is acceptable. Resample one control sample or one campaign for Class A materials every one to three years. You do not need to resample Class B or C materials. If all results are not less than one-tenth the EL, use Logan.
more than 50% of 9 or more samples	Reassess the results to find out if all results are less than the EL. If all results are less than the EL, the risk of exposure is acceptable. Resample three control samples or one campaign for Class A materials every year. Resample one control sample or one campaign every two years for Class B materials. You do not need to resample Class C materials. If all results are not less than the EL, use Logan.

% of results less than one-tenth the EL:

Take the following action(s):

less than 50%

Use Logan.

more than 50% of 6, 7, or 8 samples

Reassess the results to find out whether all the results are less than one-tenth the EL.

If all results are less than one-tenth the EL, the risk of exposure is acceptable. Resample one control sample or one campaign for Class A materials every one to three years. You do not need to resample Class B or C materials.
If all results are not less than one-tenth the EL, use Logan.

more than 50% of 9 or more samples

Reassess the results to find out if all results are less than the EL.

If all results are less than the EL, the risk of exposure is acceptable. Resample three control samples or one campaign for Class A materials every year. Resample one control sample or one campaign every two years for Class B materials. You do not need to resample Class C materials.
If all results are not less than the EL, use Logan.