The rock crushing or aggregate producing industry has a range of environmental regulations that impact their operations. The following links provide some basic information on those requirements.
Air pollution regulations
- Fact sheet on Particulate Matter Emissions and Pollution Requirements (AM-406)
- To help facilities calculate air emissions, DNR and the crushing industry worked together to develop the Nonmetallic Mining Emission Calculations Based on 1998 Nonmetallic Mining Agreement (AM-498) — see page 6 for details.
Fugitive dust control
"Fugitive dust" is a term used to describe any particulate matter (PM) emissions released through any means other than a stack or duct of some kind. Any business creating enough dust, smoke, or fumes to be a noticeable source of air pollution must control those emissions. The following are examples of activities that would create fugitive dust:
- large trucks transporting materials along unpaved roads;
- unpaved parking lots;
- piles of materials stored on site, like grain; and
- dry materials directed to equipment not collected by another device, whether by baghouse, cyclone, wet scrubber, etc.
Any business that creates fugitive dust must do as much as possible to control those emissions and keep them from escaping into the environment. The following are a few suggestions based on the type of activity. Other best management practices recommended by industry experts are provided in the fact sheet Fugitive Dust Management (AM-556).
- For roads or storage piles, this may mean using water or chemicals to prevent dust plumes. Paving roads will reduce dust. Storage piles can be kept within a three-sided building to minimize emissions.
- To know how much of an additive is allowed in water for dust prevention, refer to the storm water standards for Water quality review procedures for additives, and the two companion documents: Allowable usage rates for water applied additives and Allowable usage rates for land applied additives.
- Mechanical collection devices (i.e. cyclones and dry filters) are effective, low cost ways to control PM emissions from processing equipment. Unfortunately, higher collection efficiency in any type of equipment can often mean higher costs. For example, a baghouse can be a very high efficiency control option but is more expensive than the others.
- Under the DNR's mines, pits and quarries page there is a link to other publications and resources for crushers, or nonmetallic mining publications and resources.