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U.S. Department of Labor

Mine Safety and Health Administration
201 12th Street South, Suite 401
Arlington, VA 22202-5450

ISSUE DATE: June 16, 2010


                       Administrator for
                       Coal Mine Safety and Health

SUBJECT:     Re-Issue P01-05 - Reporting "Sampling Start Time" on
                    Redesigned Dust Data Card

This information bulletin applies to Mine Safety and Health Administration (MSHA) Coal Mine Safety and Health personnel, coal mine operators, and independent contractors.

This bulletin describes how operators should record "Sampling Start Time" on the dust data card which the manufacturer provides with each filter cassette.

The dust data card has been revised to record Sampling Start Time as a two-digit number, based on a 24-hour clock. This entry goes in the two blocks for item 7A and ranges from 00 for midnight to 23 for 11 p.m. Minutes are not recorded. For example, if the start time is between 7:00 and 7:59 a.m., record "07," or if it is between 4:00 and 4:59 p.m., record "16." For a start time between midnight and 1 a.m., record "00."

If start time is not recorded or the start time recorded is invalid, the computer-generated sampling report to the operator will display "99" as the Sampling Start Time.

MSHA may void a sample if the start time is not recorded in item 7A. However, if item 7A is not properly completed on any sample for which the respirable dust concentration exceeds the applicable dust standard, MSHA will not void the sample and will use it to determine the average concentration.

Although MSHA required operators to report the date and location of each sample on the old-style dust data card, the time of day when a sample was collected was not recorded. Because of this, it was not possible to identify the shift during which samples were collected if multiple shifts were worked each day. The revised dust data card, which has been reviewed and approved by the Office of Management and Budget, requires the reporting of the Sampling Start Time.

Posting sampling results is intended to inform miners of the respirable coal mine dust level in the working environment. With the addition of the Sampling Start Time on the dust data card, miners will be informed of the respirable dust level during their own work shift.

30 CFR 70.209, 71.209, and 90.209.

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Issuing Office and Contact Person
Coal Mine Safety and Health, Health Division
George E. Niewiadomski, (202) 693-9513

Coal and All-Volume Program Policy Manual Holders
Coal Special Interest Groups
Coal Mine Operators
Coal Independent Contractors