New Jersey Administrative Code
Title 12 - LABOR AND WORKFORCE DEVELOPMENT
Chapter 185 - PITS AND QUARRIES (SAFETY REGULATION NUMBER 12)
Subchapter 31 - DUST CONTROL
Section 12:185-31.2 - Dust control
Universal Citation: NJ Admin Code 12:185-31.2
Current through Register Vol. 56, No. 18, September 16, 2024
(a) Sampling and determination
1. The free silicon dioxide content
of stone shall be determined from composite samples representative of the material
as a whole. When different kinds of stone are handled or processed separately, each
shall be sampled and classified separately.
2. Not less than three dust samples, of at least
ten minutes duration, spaced at intervals to yield a fair average measurement of
exposure over the entire cycle of operations, shall be collected in the normal
breathing zone on the premises by an approved type impinger.
3. The atmospheric dust concentration shall be
deemed to be the average concentration, as determined from the samples by the use of
the light-field, low power technic count or its equivalent.
4. Where, because of the nature of the operations,
it is not practicable to secure samples of ten minutes duration, the use of any
other method providing equivalent representative samples shall be
permitted.
(b) Methods
1. Wherever it is required to control the
concentration of atmospheric dust, such method of dust control shall be by one of,
or combinations of, the following methods:
i.
Local exhaust systems, as provided in Section 31.3 (Local exhaust systems) of this
Chapter;
ii. Wet method of control, as
provided in Section 31.4 (Wet method of dust control) of this Chapter;
iii. General ventilation, as provided in Section
31.5 (General ventilation) of this Chapter;
iv. Respiratory protective equipment, as provided
in Section 31.6 (Respiratory protective equipment) of this Chapter;
v. Any other method, or methods, approved by the
Commissioner.
(c) Approval and tests
1. Within a reasonable length
of time prior to the completion of the installation, the employer shall notify the
Commissioner in writing and shall, in the presence of a representative, subject the
installation to the test prescribed herein.
2. All tests for the approval of dust control
methods shall be made when all machines and other processes to which the control
methods being tested apply, are in normal operation and have been so operated for a
period of not less than one hour prior to the start of the tests, except in those
cases where the time required to complete the cycle of operations under test does
not permit this initial pretest period of one hour.
3. Atmospheric dust counts shall be made at
various points representative of the exposure of the workers except that when
several workers are engaged in the same operations which are provided with the same
kind of control measures, tests may be made at a single exposure, which is
representative of the group.
4. All
tests for atmospheric dust concentrations shall be made in accordance with (a)
above.
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