Stationary Reciprocating Internal Combustion
Engines (RICE)
MACT Rule
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2. What Sources Are Subject to the Final Rule?
The final rule applies to sources if that own or operate
stationary RICE which are located at
a major source of HAPemissions, except if the stationary
RICE all have a site-rating of 500 brake HP or less. A major
source of HAP emissions is a plant site that emits or has
the potential to emit any single HAP at a rate of 10 tons
(9.07 megagrams) or more per year or any combination of HAP
at a rate of 25 tons (22.68 megagrams) or more per year.
EPA divided the stationary RICE source category into five
subcategories:
(1) stationary RICE with a site-rating of 500 brake
HP or less,
(2) emergency stationary RICE,
(3) limited use stationary RICE,
(4) stationary RICE that combust landfill gas or digester
gas equivalent to 10 percent or more of the gross heat
input on an annual basis, and
(5) other stationary RICE.
 EPA further divided the last subcategory into four subcategories:
(1) 2 stroke lean burn (2SLB) stationary RICE,
(2) 4 stroke lean burn (4SLB) stationary RICE,
(3) 4 stroke rich burn (4SRB) stationary RICE, and
(4) compression ignition (CI) stationary RICE.
The final rule does not apply to stationary RICE test
cells/stands since these facilities are covered by another
NESHAP, subpart PPPPP of 40 CFR part 63.
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