Breath Test Operator. A breath test operator shall: Perform breath tests for alcohol in accordance with training; Perform at least one test per month, either a subject or simulation test; Notify CTAU of the following: Test results that deviate greater than plus or minus 10 percent of the stated concentration for any validation test; or Mechanical problems with the breath testing instrument; and Complete all required reports. A breath test operator who fails to perform at least one test per month as required in §A(1)(b) of this regulation shall provide a reason for this failure to the CTAU supervisor. If a breath test operator will be on extended leave from the agency, the CTAU supervisor shall be notified by the breath test operator or the agency breath test supervisor. Breath Test Maintenance Technician. A breath test maintenance technician shall: Set up all instruments in the field; Conduct an inspection of the assigned breath testing instruments at least once a month; Conduct all scheduled maintenance procedures; Change the alcohol gas cylinder or alcohol reference solution as needed; Test each instrument with approved alcohol gas standard or alcohol reference solution at least once a month; Remove an instrument from service if the result of the test in §B(5) of this regulation is not plus or minus 10 percent of the stated concentration; Repair the instrument as needed; and Complete all required reports.