MENDOCINO COUNTY AIR QUALITY MANAGEMENT DISTRICT

RULE 5-500 - TESTING METHOD

Source testing shall be conducted in accordance with ARB Test Methods and the method evaluations cited therein or an acceptable source test method approved by the Executive Officer of the Air Resources Board. Specific testing requirements to apply the regulatory limits of this rule are as follows:

  1. To determine the "control efficiency" requirements of this regulation, ethylene oxide (EtO) mass or concentration reduction efficiency of a control device, shall be measured with ARB Test Method 431 (Title 17, CCR, Section 94143) according to the source testing requirements herein, and expressed as a percentage calculated across the control device as follows:

    The procedures that will be utilized during the source testing are as follows:
     
    1. The test on a control device for a sterilizer exhaust stream shall be run with a typical load, as approved by the District, in the sterilizer.
    2. The test on a control device for an aerator exhaust stream shall be run with a typical load, as approved by the District, in the aerator.
    3. The inlet and outlet of the control device shall be sampled simultaneously during testing to measure the control efficiency.
    4. The efficiency of each control device shall be determined under conditions of maximum ethylene oxide mass flow to the device, under normal operating conditions. To measure the control efficiency of the control device on the sterilizer exhaust stream, sampling shall be done during the entire duration of the first sterilizer evacuation after ethylene oxide has been introduced. To measure the control efficiency of the control device on an aerator exhaust stream with a constant air flow, sampling shall be done during a period of at least 60 minutes, starting 15 minutes after aeration begins. To measure the control efficiency of the control device on an aerator exhaust stream with a non-constant air flow, sampling shall be done during the entire duration of the first aerator evacuation after aeration begins.
    5. There shall be no dilution of the air stream between the inlet and outlet test points during testing.
  2. To determine the "leak free" requirements of this regulation the ARB Test Method 21 (Title 17, CCR, Section 94124) using a portable flame ionization detector or a non-dispersive infrared analyzer, calibrated with methane, or an acceptable alternative method or analytical instrument approved by the District shall be used. A chlorofluorocarbon-12 specific audible detector using a metal oxide semi-conductor sensor shall be considered an acceptable alternative for exhaust systems carrying a sterilant gas mixture of ethylene oxide and chlorofluorocarbon-12.