As stated in §63.8405, you must meet each operating limit in the following table that applies to you:

Open Table
For each .  .  . You must .  .  .
1. Tunnel kiln equipped with a DLA a. Maintain the average pressure drop across the DLA for each 3-hour block period at or above the average pressure drop established during the HF/HCl/Cl2 performance test; or, if you are monitoring the bypass stack damper position, initiate corrective action within 1 hour after the bypass damper is opened allowing the kiln exhaust gas to bypass the DLA and complete corrective action in accordance with your OM&M plan; and
    b. Maintain an adequate amount of limestone in the limestone hopper, storage bin (located at the top of the DLA), and DLA at all times; maintain the limestone feeder setting (on a per ton of fired product basis) at or above the level established during the HF/HCl/Cl2 performance test in which compliance was demonstrated; and
    c. Use the same grade of limestone from the same source as was used during the HF/HCl/Cl2 performance test in which compliance was demonstrated; maintain records of the source and grade of limestone; and
    d. Maintain no VE from the DLA stack.
2. Tunnel kiln equipped with a DIFF or DLS/FF a. If you use a bag leak detection system, initiate corrective action within 1 hour of a bag leak detection system alarm and complete corrective actions in accordance with your OM&M plan; operate and maintain the fabric filter such that the alarm is not engaged for more than 5 percent of the total operating time in a 6-month block reporting period; or maintain no VE from the DIFF or DLS/FF stack; and
    b. Maintain free-flowing lime in the feed hopper or silo and to the APCD at all times for continuous injection systems; maintain the feeder setting (on a per ton of fired product basis) at or above the level established during the HF/HCl/Cl2 performance test for continuous injection systems in which compliance was demonstrated.
3. Tunnel kiln equipped with a WS a. Maintain the average scrubber liquid pH for each 3-hour block period at or above the average scrubber liquid pH established during the HF/HCl/Cl2 performance test in which compliance was demonstrated; and
    b. Maintain the average scrubber liquid flow rate for each 3-hour block period at or above the highest average scrubber liquid flow rate established during the HF/HCl/Cl2 and PM/non-Hg HAP metals performance tests in which compliance was demonstrated.
4. Tunnel kiln equipped with an ACI system Maintain the average carbon flow rate for each 3-hour block period at or above the average carbon flow rate established during the Hg performance test in which compliance was demonstrated.
5. Tunnel kiln with no add-on control a. Maintain no VE from the stack.
b. Maintain the kiln process rate at or below the kiln process rate determined according to §63.8445(g)(1).

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