NYC-WTC_000220156

NYC 9/11 Public Portal Document

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LIBERTY I MUTUAL J Industrial Hygiene Air Sample Results Key to Air Sample Terminology

The folJow'ing explanations should help in reading the data chart.

1. Station Type - Refers to the general type of sample location (personal, area, source, bulk, etc.)

2. Sample ID - Is a unique sample identification.

3. Sample Zone - Refers to the construction sector on the site, designated by the Pnme Contractor name.

3. Comments - Typically this will refer to the job description of the person on whom the sample was collected.

4. Sample Type - This designates whether the sample was collected for time weighted average or short term interpretation.

5. Sample Volume (and units) - Is the amount of air that was drawn through the sampling device while the sample was collected.

6. Begin Date and End Date - The date(s) on which the sample was collected.

7. Begin Time and End Time - 'fhe time the sample was collected. We use the 24 hour clock.

8. Sample Media - This is the type of device the sample was collected on.

9. Sample Method - Titis is the sampling and analytical metliod used for collection and analysis of the sample. NIOSH and OSHA methods are typically used.

10. Sample Comment - This usually contains the name of the person on whom the sample was collected.

11. Analyte - This is the suspected contaminant substance that was sampled. Ihe sampling and analysis methods are specific to this substance.

12. Results (and units) - This is the airborne concentration of the analyte found on the sample, usually as an estimated full shift rime weighted average exposure. This is the number that should be compared to the OSHA or ACGIH limit.

13. Results Comment - Not always used. May contain comments from the industrial hygienist about results.

14. OSHA PEL or ACGIH TLV - This refers to the Occupational exposure limit to which the result should be compared. OSHA establishes Permissible Exposure Limits (PELs) that have the force of law, through a mle-making process. The American Conference of Governmental Industrial Hygienists, a volunteer professional organization, estabhshes Threshold Limit Values (TLVs) that serve as guidehnes for assessing occupational exposure to health hazards. Most

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NYC-WTC_000220157