30 CFR § 57.5040
Exposure records.
(a) The operator shall calculate and record complete individual
exposures to concentrations of radon daughters as follows:
(1) Where uranium is mined--the complete individual
exposures of all mine personnel working underground shall be calculated and
recorded. These records shall include the individual's time in each active
working area such as stopes, drift headings, travelways, haulageways, shops,
stations, lunch rooms, magazines and any other place or location where
persons work, travel or congregate, and the concentration of airborne radon
daughters for each active working area.
(2) Where uranium is not mined--the complete individual
exposure of all mine personnel working in active working areas with radon
daughter concentrations in excess of 0.3 WL shall be calculated and recorded.
These records shall include the individual's time in each active working area
and the concentrations of airborne radon daughters for each active working
area. The operator may discontinue calculating and recording the individual
exposures of any personnel assigned to work in active working areas where
radon daughter concentrations have been reduced to 0.3 WL or less for 5
consecutive weeks provided that such exposure calculation and recordation
shall not be discontinued with respect to any person who has accumulated more
exposure than 1/12 (one-twelfth) of a WLM times the number of months for
which exposures have been calculated and recorded in the calendar year in
which the exposure calculation and recordation is proposed to be
discontinued.
(b) The operator shall maintain the form entitled "Record of
Individual Exposure to Radon Daughters" (Form 4000-9), or equivalent forms
that are acceptable to the Administrator, Metal and Nonmetal Mine Safety and
Health, Mine Safety and Health Administration, on which there shall be
recorded the specific information required by the form with respect to each
person's time-weighted current and cumulative exposure to concentrations of
radon daughters.
(1) The form entitled "Record of Individual Exposure to
Radon Daughters" (Form 4000-9), shall consist of an original of each form for
the operator's records which shall be available for examination by the
Secretary or his authorized representative.
(2) On or before February 15 of each calendar year, or
within 45 days after the shutdown of mining operations for the calendar year,
each mine operator shall submit to the Mine Safety and Health Administration
a copy of the "Record of Individual Exposure to Radon Daughters" (Form
4000-9), or acceptable equivalent form, showing the data required by the form
for all personnel for whom calculation and recording of exposure was required
during the previous calendar year.
(3) Errors detected by the operator shall be corrected on
any forms kept by the operator and a corrected copy of any forms submitted to
the Mine Safety and Health Administration shall be submitted to the Mine
Safety and Health Administration within 60 days of detection and shall
identify the errors and indicate the date the corrections are made.
(4) The operator's records of individual exposure to concentrations
of radon daughters and copies of "Record of Individual Exposure to Radon
Daughters" (Form 4000-9) or acceptable equivalent form or true legible
facsimiles thereof (microfilm or other), shall be retained at the mine or
nearest mine office for a period as specified in paragraph 9.8, ANSI
N13.8-1973, or shall be submitted to the Mine Safety and Health
Administration. These records, if retained by the operator, shall be open for
inspection by the Secretary of Labor, his authorized representative, and
authorized representatives of the official mine inspection agency of the
State in which the mine is located. Paragraph 9.8, ANSI N13.8-1973, is
incorporated by reference and made a part of this standard. ANSI N13.8-1973
may be examined at any Metal and Nonmetal Mine Safety and Health District
Office of the Mine Safety and Health Administration, and may be obtained from
the American National Standards Institute, Inc., at 25 W. 43rd Street, 4th Floor, New York, NY 10036; http://www.ansi.org.
(5) Upon written request from a person who is a subject of
these records, a statement of the year-to-date and cumulative exposure
applicable to that person shall be provided to the person or to whomever such
person designates.
(6) The blank form entitled "Record of Individual Exposure
to Radon Daughters" (Form 4000-9) may be obtained on request from any MSHA Metal and Nonmetal Mine Safety and Health district office.
NOTE: To calculate an individual's exposure to WLM for a given period of
time, multiply the total exposure time (hours to the nearest half-hour) in
an active working area by the average concentration of airborne radon
daughters for the applicable active working area (average working level
calculated to the nearest hundredth working level) and divide the product by
the constant 173 hours per month.
An average airborne radon daughter concentration for a designated active
working area shall be determined by averaging all sampling results for that
working area during the time that persons are present. Any sample taken by
Federal or State mine inspectors, which represents exposure to miners and
reported to the operator within three days of being taken, shall be included
in the average concentration; except that if the mine operator samples
simultaneously with the inspector, he may use his own sample results.
[60 FR 33719, June 29, 1995; 60 FR 35692, July 11, 1995]
For further information: See MSHA's Program Policy Manual