New Jersey Administrative Code
Title 12 - LABOR AND WORKFORCE DEVELOPMENT
Chapter 185 - PITS AND QUARRIES (SAFETY REGULATION NUMBER 12)
Subchapter 31 - DUST CONTROL
Section 12:185-31.1 - General provisions
Universal Citation: NJ Admin Code 12:185-31.1
Current through Register Vol. 56, No. 18, September 16, 2024
(a) This Subchapter for the control of dust shall apply to all operations done in connection with the pit and quarry industry.
(b) All pit and quarry operations shall be so conducted that there shall be no exposure to atmospheric dust concentrations in excess of those concentrations limited by (c) below.
(c) The maximum allowable atmospheric dust concentration, expressed as the total number of particles of dust per cubic foot of air, shall not exceed the values given in the following table:
| Maximum allowable dust concentration mineral dusts | |
| Substance | MPPCF n* |
| Aluminum oxide | 50 |
| Asbestos | 5 |
| Dust (nuisance, no free silica) | 50 |
| Mica (below five percent free silica) | 20 |
| Portland cement | 50 |
| Talc | 20 |
| Silica | |
| High (above 50 percent free S:O[2]) | 5 |
| Medium (five to 50 percent free S:O[2]) | 20 |
| Low (below five percent free S:O[2]) | 50 |
| Silicon carbide | 50 |
| Soapstone (below five percent free silica) | 20 |
| n* Millions of particles per cubic feet of air | |
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