Section 24-129. Testing before granting or renewing of operating certificates and sulfur exemption certificates

(a) Before an operating certificate,  or a sulfur exemption certificate as  provided  by  subdivision  (a)  of
  section  24-171 of this code is granted or renewed, the commissioner may
  require the applicant to conduct such tests  as  are  necessary  in  the
  opinion  of  the  commissioner  to  determine  the kind or amount of air
  contaminant emitted from the equipment,  or  to  determine  whether  the
  equipment  or  apparatus, its operation, or the fuel or material used is
  contributing to, or is in, violation of this code.  The  test  shall  be
  made at the expense of the applicant.
    (b)  Such tests shall be conducted, reviewed and certified as provided
  by subdivision (b) of section 24-107 of this code. The  applicant  shall
  notify  the  department  of  the time and place of a test as provided by
  subdivision (c) of section 24-107 of this  code.  Reasonable  facilities
  shall be made available for the department to witness the test.
    (c)  If in the opinion of the commissioner tests by the department are
  necessary, the facilities for such  tests,  exclusive  of  sampling  and
  sensory  devices,  shall be furnished by and at the expense of the owner
  or lessee or his or her agent as provided by subdivision (d) of  section
  24-107 of this code.