Colorado Code § 42-4-408

Operation of diesel inspection station
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(1) (a) A licensed diesel inspection
station shall issue a certification of diesel emissions control to a diesel vehicle only upon forms
issued by the executive director.
(b) A certification of diesel emissions control shall be issued by a licensed diesel
inspection station to a diesel vehicle only after the licensed diesel emission inspector performing
the inspection determines that:
(I) The smoke opacity levels from the diesel vehicle comply with the applicable smoke
opacity limits, in which case a certification of diesel emission compliance shall be issued;
(II) The smoke opacity levels from the diesel vehicle do not comply with the applicable
smoke opacity limits after adjustment or repair required in accordance to commission rules have
been performed, in which case a certification of diesel smoke opacity waiver shall be issued.
(2) Notwithstanding the provisions of subsection (1) of this section, no certification of
diesel emissions control may be issued to a diesel vehicle of model year 1991 and newer if there
is evidence of diesel emissions control system tampering.
(3) A licensed diesel emissions inspection station shall charge a fee as set by the
commission for the inspection of any diesel vehicle pursuant to this section. Such fee shall be
intended to encompass all costs related to the inspection, including those costs incurred by the
inspection station, the department of revenue, and the department of public health and
environment. No fee that is charged pursuant to this section shall exceed the posted hourly shop
rate for one hour. Such fee shall be posted by the inspection station pursuant to regulations set by
the commission. Personnel within the testing inspection station shall notify the owner of the
diesel vehicle to be tested of the fee before commencing any testing activities.

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