Document ID: EPA-HQ-OAR-2021-0299-0045
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2023-02-10T05:00Z

E. Additional Annual Compliance Demonstration
	In addition to continuous compliance with the LDSN-DRF as required by the sections IV.A-D, the following annual compliance demonstration actions are required for the LDSN-DRF system located in the Meta-Xylene and Mid-Crude process units:
	(a) Method 21 of appendix A-7 of part 60 must be conducted in each process unit equipped with the LDSN-DRF according to the following requirements:
	(1) The first survey must be conducted within 12 calendar months of implementation of the AMEL in a given unit. Subsequent surveys must be conducted no sooner than 10 calendar months and no later than 12 calendar months after the preceding survey.
	(2) Identify the valves to be monitored as described below. Monitor the valves located in these verification zones as described in IV.E(a)(2)(i) through (v) or IV.E(a)(2)(vi) using Method 21 of appendix A-7 of part 60 as specified in section 60.485a(b) of 40 CFR part 60, subpart VVa, with the exception that the high scale calibration gas must be approximately 20,000 ppm.
	(i) Determine the total number of valves located in the individual process unit. The minimum number of valves monitored must equal 20 percent of the total population of valves in the process unit.
	(ii) Identify each verification zone on a plot plan. The verification zone is the area between the radii that are 45 and 50 feet from each individual sensor. Determine the total number of valves that occur in only one sensor verification zone (i.e., verification zones that have no overlap with other verification zones). If the number of valves that occur in only one sensor verification zone is greater than the minimum number of valves that must be monitored, monitor a random selection of these valves according to IV.E(a)(2)(v).
      (iii) If the number of valves that occur in only one sensor verification zone is less than the minimum number of valves that must be monitored, determine the total number of valves that occur in all verification zones, including those that overlap. If the total number of valves in all verification zones is greater than the minimum number of valves that must be monitored, monitor all the valves that occur in only one sensor verification zone. Additionally, monitor a random selection of valves, chosen in accordance with IV.E(a)(2)(v), that appear in verification zones that overlap until the 20 percent minimum is achieved. 
      (iv) If the number of valves in all verification zones is less than 20 percent of the total population, then monitor all of the valves in all verification zones. Additionally, monitor a random sample of additional valves within the LDSN but outside of the verification zones, chosen in accordance with IV.E (a)(2)(v), until the 20 percent minimum is achieved. 
      (v) Random sampling of valves. To determine the random selection of valves to monitor, determine the population of valves that must be randomly sampled as determined in IV.E(a)(2)(ii), (iii), or (iv) (i.e., 20 percent of the total valve population or 20 percent of the total valve population minus the number of valves in the verification zones). Divide the population of valves by the number of valves that must be sampled and round to the nearest integer to establish the sampling interval. Using the valve IDs sequentially, monitor valves at this sequential interval (e.g., every 5 valves). Alternatively, use the valve IDs and a random number generator to determine the valves to monitor. Each survey conducted under IV.E(a)(1) must start on a different valve ID such that the same population of valves is not monitored in each survey.	
      (vi) In lieu of implementing IV.E.(a)(2)(i) through (v), FHR may elect to monitor 50% of the total number of light liquid and gas vapor (LL/ GV) valves that occur within the expected LDSN coverage area the first year. This shall be done by monitoring every other valve in the given tag range (e.g., all odd numbered valves) such that nominally 50% of the valves have been monitored. In the following year, the other 50% of the valves (e.g., all even numbered valves) that were not monitored in the first year shall be monitored. Each subsequent survey must rotate between the two sets of valves such that the same population of valves is not monitored during two consecutive surveys.
      (3) Monitor each pump located in the process unit using Method 21 of appendix A-7 of part 60 as specified in section 60.485a(b) of 40 CFR part 60, subpart VVa. 
	(4) For purposes of this monitoring, a leak is identified as an instrument reading above the leak definitions in Table 2 of this AMEL. All identified leaks must be repaired or placed on DOR within 15 calendar days of detection, with a first attempt completed within five calendar days of detection.
	(5) Once annual monitoring survey conducted in IV.E(a)(4) is complete, any leaks identified greater than 3,000 ppm shall be plotted on a plot plan of the unit along with all active PSLs. If any LDAR applicable components are identified with an instrument reading above 18,000 ppm, that are not components in an active PSL or components that have been identified as leakers or previously placed on delay of repair, then the leaker is a Non-Compliant Leaker (NC leaker), and a Zone of Incomplete Coverage (ZIC) shall be defined as the area with a 15-foot radius horizontally and vertically around the leaking component. Furthermore, any LDAR applicable components identified with an instrument reading above 3,000 ppm and located within  18 feet of any sensor node, are also defined as NC leakers and a ZIC shall be defined as the area with a 15-foot radius horizontally and vertically around the leaking component.

	(i) EPA or its delegated authority may conduct audits of the LDSN at any time, using the same approach to determine NC leakers using Method 21 of appendix A-7 of part 60.
      (ii) For each NC leaker found during the annual verification monitoring performed by FHR, and/or any inspection from EPA or its delegated authority conducted within any 2 calendar-week period, the requirements in paragraphs IV.E.(a)(5)(ii)(A) and (B) apply. If two or more NC leakers are found during such monitoring, paragraphs (C) and (D) also apply.
      (A) Monitoring shall be conducted for all LL/GV valves and pumps in the ZIC that were not already monitored during the current annual verification monitoring, Method 21 of appendix A-7 of part 60. The leak definitions in Table 2 shall be used to determine if a leak is detected. Any identified leaks shall be repaired or placed on DOR per IV.E.(a)(4). All NC leakers shall be considered violations of the AMEL and reported as such. The period of noncompliance shall end when repairs are made and verified or placed on DOR and all M21 monitoring has been completed for LL/GV valves and pumps in the ZIC.
      (B) Until the actions in IV.E.(a)(5)(ii)(A) are completed, quarterly monitoring of LL/GV valves and pumps is required in the ZIC using Method 21 of appendix A-7 of part 60.
      (C) Two or more NC leaks detected could be indicative of a system or program defect. The facility shall conduct a root cause analysis (RCA) to determine the cause of the defect and to determine appropriate corrective action. The RCA shall begin within 5 days and be completed no later than 45 days after completion of the survey in IV.E.(a)(4). If corrective actions will take longer than 45 days to complete, then a corrective action plan shall be submitted to EPA and be reported as a Title V deviation until corrective actions are completed.
      (D) If the corrective actions include revisions to the sensor network, FHR must submit a plan within 15 days of the completion of the RCA in IV.E.(a)(5)(ii)(C), to revise the sensor network to CCG-AWP@epa.gov. Revisions to the sensor network must include the addition of new sensors to reduce the detection radius of each sensor, location changes of any previously deployed sensors, and/or the deployment of a different sensor type.
      
	
      
      
      
	
      
	(b) FHR may stop conducting the additional annual compliance demonstration required in IV.E(a) if no leaks above 18,000 ppm are identified with Method 21 of appendix A-7 of part 60 over a period of 2 consecutive calendar years.