1. (a) For the gas/gas method using a TTE, as described in Method 204, the CE shall be determined by the following procedure:

   1. (1) "CE" means the capture efficiency calculated as a decimal fraction;
   2. (2) "G" means the mass of VOC captured and delivered using TTE, obtained using Method 204C, or if a single flame ionization analyzer (FIA) device cannot be used simultaneously for Method 204D and Method 204C, Method 204B may be used for the determination of G;
   3. (3) "F" means the mass of fugitive VOC that escapes from TTE, obtained using Method 204D; and

   4. (4) CE shall be obtained by dividing G by the sum of G and F, as in the following equation:

      CE = G/(G + F)

2. (b) For the liquid/gas method using TTE, as described in Method 204, the CE shall be determined by the following procedure:

   1. (1) “CE” means the capture efficiency calculated as a decimal fraction;
   2. (2) “L” means the mass of liquid VOC input to process, obtained using Method 204A or Method 204F;
   3. (3) “F” the mass of fugitive VOC that escapes from a TTE, obtained using Method 204D; and

   4. (4) CE shall be means obtained by dividing the difference between L and F by L, as in the following equation:

      CE = (L - F)/L

3. (c) For the gas/gas method using as the enclosure the BE in which the affected source is located and in which G and FB, as defined in (c)(2), below, are measured while operating only the affected facility:

   1. (1) All fans and blowers in the BE shall be operated as they would under normal production; and

   2. (2) The CE shall be determined as follows:

      1. a. “CE” means the capture efficiency calculated as a decimal fraction;
      2. b. “G” means the mass of VOC captured and delivered to a control device, obtained using Method 204C, or if a single FIA device cannot be used simultaneously for Method 204E and Method 204C, Method 204B may be used for the determination of G;
      3. c. “FB” means the mass of fugitive VOC that escapes from the BE, obtained using Method 204E; and

      4. d. CE shall be obtained by dividing G by the sum of G and FB, as in the following equation:

         CE = G/(G + F_B)

4. (d) For the liquid/gas method using as the enclosure the BE in which the affected source is located and in which L and FB, as defined in (d)(2), below, are measured while operating only the affected facility:

   1. (1) All fans and blowers in the BE shall be operated as they would under normal production; and

   2. (2) The CE shall be determined as follows:

      1. a. “CE” means the capture efficiency calculated as a decimal fraction;
      2. b. “L” means the mass of liquid VOC input to process, obtained using Method 204A or Method 204F;
      3. c. “FB” means the mass of fugitive VOC that escapes from the BE, obtained using Method 204E; and

      4. d. The CE shall be obtained by dividing the difference between L and FB by L, as in the following equation:

         CE = (L - F_B)/L

Source. #7788, eff 10-31-02; ss by #9802, eff 10-31-10; ss by #12762, eff 5-1-19