     Requirements for Existing Non-Emergency Spark Ignition 4SLB and 4SRB 
           Stationary RICE >500 HP Located at Area Sources of HAP

(a) Owners and operators of existing non-emergency spark ignition four-stroke lean burn (4SLB) and four-stroke rich burn (4SRB) stationary RICE  >500 HP located at area sources of HAP meeting any of the criteria in paragraphs (a)(1) through (3) must meet identical requirements to those currently specified for existing non-emergency spark ignition 4SLB and 4SRB stationary RICE <=500 HP located at area sources of HAP (i.e., the management practices in items 7 and 9 in Table 2d  to subpart ZZZZ and the operation and maintenance requirements in §63.6625(e), (h), and (j)).

(1) Stationary RICE located in an offshore area that is beyond the line of ordinary low water along that portion of the coast of the United States that is in direct contact with the open seas and beyond the line marking the seaward limit of inland waters.

(2) Stationary RICE located on a pipeline segment that meets both of the criteria in paragraphs (a)(2)(i) and (ii).

(i) A pipeline segment with 10 or fewer buildings intended for human occupancy within 220 yards (200 meters) on either side of the centerline of any continuous 1-mile (1.6 kilometers) length of pipeline. Each separate dwelling unit in a multiple dwelling unit building is counted as a separate building intended for human occupancy.

(ii) The pipeline segment does not lie within 100 yards (91 meters) of either a building or a small, well-defined outside area (such as a playground, recreation area, outdoor theater, or other place of public assembly) that is occupied by 20 or more persons on at least 5 days a week for 10 weeks in any 12-month period. The days and weeks need not be consecutive. The building or area is considered occupied for a full day if it is occupied for any portion of the day. 

(iii) For purposes of this paragraph (2), the term pipeline segment means all parts of those physical facilities through which gas moves in transportation, including but not limited to pipe, valves, and other appurtenance attached to pipe, compressor units, metering stations, regulator stations, delivery stations, holders, and fabricated assemblies. Stationary RICE located within 50 yards (46 m) of the pipeline segment providing power for equipment on a pipeline segment are part of the pipeline segment. Transportation of gas means the gathering, transmission, or distribution of gas by pipeline, or the storage of gas. A building is intended for human occupancy if its primary use is for a purpose involving the presence of humans.

(3) Stationary RICE that are not located on pipelines and that have 5 or fewer buildings intended for human occupancy within a 0.25 mile radius around the engine.

(b) Owners and operators of existing non-emergency spark ignition 4SLB and 4SRB stationary RICE  >500 HP located at area sources of HAP meeting the criteria in paragraph (a) must evaluate the status of their stationary RICE every 12 months. If the stationary RICE no longer meets the criteria in paragraph (a), the owner or operator must comply with the requirements specified in paragraph (c) within one year.

(c) Owners and operators of existing non-emergency spark ignition 4SLB and 4SRB stationary RICE  >500 HP located at area sources of HAP that do not meet the criteria in paragraph (a) must meet the requirements of this paragraph (c). 

(1) Install a catalyst to reduce emissions of HAP.
 
(2) Meet the requirements of paragraph (i) or (ii):

(i) Continuously monitor the catalyst inlet temperature and maintain the temperature between the specified range in subpart ZZZZ, or 

(ii) Equip the engine with automated shutdown so that the catalyst inlet temperature does not exceed the specified maximum temperature of the range in subpart ZZZZ.

(3) Conduct an initial test, and subsequent annual tests, to show the catalyst reduces emissions as specified in paragraphs (c)(3)(i) and (ii). The initial test must consist of three test runs. Each subsequent annual test must consist of one test run. Each test run must be of at least 15 minute duration, except that each test run with CTM-034 must consist of one measurement cycle as defined by the method and include at least 2 minutes of test data phase measurement.

(i) For 4SLB stationary RICE, CO emissions must be reduced by 93 percent or more, or limited to 47 ppmvd at 15% O2.

(ii) For 4SRB stationary RICE, CO must be reduced by 75 percent or more, or alternatively, THC must be reduced by 30 percent or more.
 
(4) The CO and O2 testing required in paragraph (c)(3) can be conducted using EPA Conditional Test Method 034 or the methods already specified in subpart ZZZZ. The THC testing required in paragraph (c)(3) can be conducted using EPA Method 25A. 

(5) If any of the tests required in paragraph (c)(3) show that the emissions exceed the levels specified in paragraph (c)(3), the stationary RICE must be shut down as soon as safely possible and appropriate corrective action must be taken (e.g., repairs, the catalyst cleaned or replaced). The stationary RICE must be retested within 7 days of being restarted and the emissions must meet the levels specified in paragraph (c)(3). If the retest shows that the emissions continue to exceed the specified levels, the stationary RICE must again be shut down as soon as safely possible, and the engine may not operate, except for purposes of start-up and testing, until the owner/operator demonstrates through testing that the emissions do not exceed the levels specified in paragraph (c)(3). 

(6) Failure to meet any of the requirements of paragraphs (c)(1), (c)(2), and (c)(5) is a violation of subpart ZZZZ. Failure to conduct an initial test and subsequent annual tests, as specified in paragraph (c)(3), is a violation of subpart ZZZZ.



  
