R 336.1301 Standards for density of emissions.

Rule 301. (1) Except as provided in subrules (2), (3), and (4) of this rule, a person shall not cause or permit to be discharged into the outer air from a process or process equipment a visible emission of a density greater than the most stringent of the following: (a) A 6-minute average of 20% opacity, except for 1 6-minute average per hour of not more than 27% opacity. (b) A limit specified by an applicable federal new source performance standard. (c) A limit specified as a condition of a permit to install or permit to operate. (2) The provisions of this rule shall not apply to any process or process equipment for which fugitive visible emission limitations are specified in any other administrative rule of the department. (3) The provisions of subrule (1) of this rule shall not apply to visible emissions due to uncombined water vapor. (4) Upon request by the owner of a process or process equipment for which an allowable particulate emission rate is established by R 336.1331, the department may establish an alternate opacity. Such alternate opacity shall not be established by the department unless the department is reasonably convinced of all of the following: (a) That the process or process equipment subject to the alternate opacity is in compliance or on a legally enforceable schedule of compliance with the other rules of the department. (b) That compliance with the provisions of subrule (1) of this rule is not technically or economically reasonable. (c) That reasonable measures to reduce opacity have been implemented or will be implemented in accordance with a schedule approved by the department.