Guide to 40 CRF Part 60, Subpart OOO Standards of Performance for Nonmetallic Mineral Processing Plants
|Air Pollution Control Program fact sheet||
|Division of Environmental Quality Director: Leanne Tippett Mosby||
Disclaimer: The statements in this document are intended solely as guidance. This document is not intended, nor can it be relied on, to create any rights enforceable by any party in litigation. This guidance may be revised without public notice to reflect changes in law, regulation or policy.
This fact sheet is intended to explain some portions of 40 CFR 60, Subpart OOO – Standards of Performance for Nonmetallic Mineral Processing Plants. This subpart typically applies to rock crushing plants in Missouri. This rule is often referred to as New Source Performance Standard, or NSPS-OOO.
It is important to note in this rule, use of the term facility does not mean a complete rock crushing plant or installation. It refers to specific equipment including, but not limited to, a screen, conveyor, bucket elevator or a crusher.
This rule was amended on April 16, 2009. These amendments replace the former version of the rule. As a regulated entity, the conditions of the most recent regulation must be met when considering compliance issues at your rock crushing plant.
Affected Facility - Any crusher, grinding mill, screening operation, bucket elevator, belt conveyor, bagging operation, storage bin and enclosed truck or railcar loading station used at the installation. Static (non-moving) grizzly screens are not considered a screening operation and are not considered an affected facility.
Capacity - The cumulative capacity rate of all initial crushers that are part of the plant.
Crush or Crushing - To reduce the size of nonmetallic mineral material by means of physical impaction of the crusher or grinding mill upon the material.
Fugitive Emission - Particulate matter not collected by a capture system and released to the atmosphere at the point of generation.
Initial Crusher - The point of initial crushing for any nonmetallic minerals at the plant.
Nonmetallic Mineral Processing Plant - Any combination of equipment used to crush or grind any nonmetallic mineral wherever located, including lime plants, power plants, steel mills, asphalt concrete plants, portland cement plants or any other facility processing nonmetallic minerals.
Stack Emission - The particulate matter released into the atmosphere from a capture system.
Transfer Point - A point in a conveying operation where the nonmetallic mineral is transferred to or from a belt conveyor, except where the nonmetallic mineral is being transferred to a stockpile.
See the rule text for a more complete list of definitions.
Following is a list of nonmetallic minerals as defined in the rule. A crushing plant that processes any of these nonmetallic minerals, or a mixture of which any of these are the majority, is considered a nonmetallic mineral processing plant.
Crushed and broken stone
|Sand and gravel||Rock salt||Clay||Feldspar|
|Gypsum (natural or synthetic)||Diatomite||Perlite||Mica|
|Talc and pyrophylite|
Applicability and Affected Facilities
If you own or operate an affected facility (or facilities) with a manufacture date on or after Aug. 31, 1983, this rule applies to you. However, your affected facilities with a manufacture date on or after April 22, 2008, will usually have different emission limits and different monitoring and performance testing requirements.
The rule does not apply to the following operations:
- Facilities located in underground mines.
- Plants with no crusher or grinding mill above ground.
- Wet material processing operations. See the rule text for the definition of a wet material processing operation.
- Fixed crushing or sand and gravel plants with an initial crushing capacity of 25 tons per hour or less.
- Portable crushing or sand and gravel plants with an initial crushing capacity of 150 tons per hour or less.
- Common clay plants and pumice plants with an initial crushing capacity of 10 tons per hour or less.
- An installation subject to 40 CFR Part 60, Subpart F or I. Note: If you have a facility (or facilities) located prior to the first bin at an asphalt plant, that facility (or facilities) may be subject to the rule.
The emission limits for affected facilities manufactured before April 22, 2008, remain unchanged. This means a particulate matter emission limit of 0.022 grains per dry standard cubic foot, or gr/ dscf, a visible emission limit of 7 percent opacity for stack emissions, and a visible emission limit of 10 percent opacity (15 percent for crushers) for fugitive emissions.
Emission limits for affected facilities manufactured on or after April 22, 2008, have changed. The emission limits for affected facilities in this category are:
- For stack emissions the particulate matter emission limit is 0.014 gr/dscf. There is no visible emission limit, it has been replaced with ongoing baghouse monitoring requirements.
- For fugitive visible emissions the opacity limit is 7 percent (12 percent for crushers).
If you have a baghouse controlling emissions from a single storage bin, the visible emissions from the baghouse exhaust are limited to seven percent opacity. There is no particulate matter emission limit for this exhaust. This does not apply to baghouses controlling multiple storage bins, only a baghouse controlling a single storage bin.
There is no emission limit specified in this rule for truck dumping of nonmetallic minerals into
any screening operation, feed hopper or crusher. However, State Rule 10 CSR 10-6.170 –
Restriction of Particulate Matter to the Ambient Air Beyond the Premises of Origin would apply
to these fugitive emission sources.
Compliance Requirements Initial Performance Testing
Initial performance testing is required for your affected facilities whether the manufacture date is prior to, or on or after April 22, 2008. This testing must be conducted within 180 days of initial startup of the affected facility.
If you control emissions from your affected facilities with a baghouse or any other type of capture and control system, initial performance testing for particulate matter emissions may be conducted using either EPA Method 5 or 17. If required (see emission limits above) opacity of visible emissions from a stack must be determined using EPA Method 9.
If you have fugitive emissions from your affected facilities, initial performance testing must be conducted using EPA Method 9. The duration of the performance test has been reduced from 60 minutes to 30 minutes in the revised rule, and there is no requirement to test for three hours in the revised rule. Compliance with the opacity limit is based on the average of the five consecutive six minute averages. This applies to facilities manufactured prior to, or on or after April 22, 2008.
If fugitive emissions are escaping a capture system you have installed, those fugitive emissions points are also subject to the initial performance testing requirements mentioned in the previous paragraph. An example of this situation is a capture system not capable of capturing all the emissions from an emission point. Sources should ensure all capture systems, ducting and control devices are working properly prior to any testing.
If you have a baghouse controlling emissions from a single storage bin you do not need to test for particulate matter emissions, only the opacity of visible emissions. You must use EPA Method 9 to conduct the initial performance test. The duration of the test must be 60 minutes. For performance tests involving only Method 9 testing, you are no longer required to notify the Department of Natural Resources 30 days prior to testing. The revised rule requires only a seven day notification prior to testing. Also, if a performance test date falls during a seasonal shutdown, you may postpone the test date to no later than 60 days after resuming operation. However, you must obtain prior approval from the department.
Except for the ongoing monitoring requirements for wet scrubbers, most of the monitoring requirements in the revised rule are new, and they generally affect facilities with a manufacture date on or after April 22, 2008. Following is a summary of monitoring requirements that may affect you.
If you use a baghouse to control emissions from your affected facilities manufactured on or after April 22, 2008, you must conduct ongoing monitoring of the baghouse. This includes, but is not limited to, conducting quarterly 30 minute visible emissions inspections using EPA Method 22. See Sections 60.674 – Monitoring of Operations and 60.676 – Reporting and Recordkeeping, of the rule for specific requirements.
If you use a wet suppression system, or “carryover” from a wet suppression system, to control
fugitive emissions from your affected facilities manufactured on or after April 22, 2008, you must
conduct ongoing monitoring of the wet suppression system. This includes, but is not limited to,
monthly inspections and corrective actions when needed. Again, see Sections 60.674 –
Monitoring of Operations and 60.676 – Reporting and recordkeeping, of the rule for specific
If you do not use a wet suppression system, or “carryover” from a wet suppression system, to control fugitive emissions from an affected facility manufactured on or after April 22, 2008, you must conduct a repeat EPA Method 9 performance test for that affected facility within five years of the previous performance test. However, if the affected facility is enclosed in a building, a repeat performance test is not required.
If you use a wet scrubber to control emissions from your affected facilities, whether they were manufactured before, or on or after, April 22, 2008, you must conduct ongoing monitoring of the wet scrubber parameters in accordance with Sections 60.674 – Monitoring of Operations and 60.676 – Reporting and Recordkeeping, of the rule.
Buildings that Enclose Affected Facilities
The rule contains an optional compliance method that allows emission measurement from any buildings that enclose any affected facilities, instead of each affected facility within the building. The revised rule limits visible emissions from any building opening, except vents, to seven percent opacity. To demonstrate initial compliance using this option, you must use EPA Method 9 for the initial performance test, the same way you would for a fugitive emission point. Vents must meet the stack emission limits and initial performance test requirements mentioned above. See the rule text for the definition of a vent.
Notifications and Reports
The revised rule requires notifications and reports need only be sent to the Department of Natural Resources’ Air Pollution Control Program. There is no longer a requirement to send these to EPA.
Department of Natural Resources Regional Offices
Kansas City Regional Office
500 NE Colbern Road
Lee's Summit, MO 64086-4710
Northeast Regional Office
1709 Prospect Dr.
Macon, MO 63552-2602
St. Louis Regional Office
7545 S. Lindbergh, Suite 210
St. Louis, MO 63125
Southeast Regional Office
2155 N. Westwood Blvd.
Poplar Bluff, MO 63901
Southwest Regional Office
2040 W. Woodland
Springfield, MO 65807-5912