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Federal Register / Vol. 86, No. 97 / Friday, May 21, 2021 / Rules and Regulations
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the supporting documentation. Off-site records may be maintained if they are retrievable within 4 hours. Either paper copy or electronic formats are acceptable.
g Landfill owners or operators seeking to demonstrate that site-specific surface methane emissions are below 500 parts-per-million by conducting SEM under the Tier 4 procedures specified in 62.16718a6 must keep for at least 5 years up-to-date, readily accessible records of all SEM and information related to monitoring instrument calibrations conducted according to sections 8 and 10 of EPA
Method 21 of appendix A7 of 40 CFR
part 60 of this chapter, including all of the following items:
1 Calibration records.
i Date of calibration and initials of operator performing the calibration.
ii Calibration gas cylinder identification, certification date, and certified concentration.
iii Instrument scales used.
iv A description of any corrective action taken if the meter readout could not be adjusted to correspond to the calibration gas value.
v If an owner or operator makes their own calibration gas, a description of the procedure used.
2 Digital photographs of the instrument setup. The photographs must be time and date-stamped and taken at the first sampling location prior to sampling and at the last sampling location after sampling at the end of each sampling day, for the duration of the Tier 4 monitoring demonstration.
3 Timestamp of each surface scan reading.
i Timestamp should be detailed to the nearest second, based on when the sample collection begins.
ii A log for the length of time each sample was taken using a stopwatch e.g., the time the probe was held over the area.
4 Location of each surface scan reading. The owner or operator must determine the coordinates using an instrument with an accuracy of at least 4 meters. Coordinates must be in decimal degrees with at least five decimal places.
5 Monitored methane concentration parts per million of each reading.

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6 Background methane concentration parts per million after each instrument calibration test.
7 Adjusted methane concentration using most recent calibration parts-permillion.
8 For readings taken at each surface penetration, the unique identification location label matching the label specified in paragraph d of this section.
9 Records of the operating hours of the gas collection system for each destruction device.
h Except as provided in 62.16724d2, each owner or operator subject to the provisions of this subpart must keep for at least 5 years up-to-date, readily accessible records of all collection and control system monitoring data for parameters measured in 62.16722a1, 2, and 3.
i Any records required to be maintained by this subpart that are submitted electronically via the EPAs CDX may be maintained in electronic format.
j For each owner or operator reporting leachate or other liquids addition under 62.16724l, keep records of any engineering calculations or company records used to estimate the quantities of leachate or liquids added, the surface areas for which the leachate or liquids were applied, and the estimates of annual waste acceptance or total waste in place in the areas where leachate or liquids were applied.
62.16728 Specifications for active collection systems.

Follow the specifications for active collection systems in this section.
a Each owner or operator seeking to comply with 62.16714b must site active collection wells, horizontal collectors, surface collectors, or other extraction devices at a sufficient density throughout all gas producing areas using the following procedures unless alternative procedures have been approved by the Administrator.
1 The collection devices within the interior must be certified to achieve comprehensive control of surface gas emissions by a professional engineer.
The following issues must be addressed
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in the design: Depths of refuse, refuse gas generation rates and flow characteristics, cover properties, gas system expandability, leachate and condensate management, accessibility, compatibility with filling operations, integration with closure end use, air intrusion control, corrosion resistance, fill settlement, resistance to the refuse decomposition heat, and ability to isolate individual components or sections for repair or troubleshooting without shutting down entire collection system.
2 The sufficient density of gas collection devices determined in paragraph a1 of this section must address landfill gas migration issues and augmentation of the collection system through the use of active or passive systems at the landfill perimeter or exterior.
3 The placement of gas collection devices determined in paragraph a1
of this section must control all gas producing areas, except as provided by paragraphs a3i and ii of this section.
i Any segregated area of asbestos or nondegradable material may be excluded from collection if documented as provided under 62.16726d. The documentation must provide the nature, date of deposition, location and amount of asbestos or nondegradable material deposited in the area, and must be provided to the Administrator upon request.
ii Any nonproductive area of the landfill may be excluded from control, provided that the total of all excluded areas can be shown to contribute less than 1 percent of the total amount of NMOC emissions from the landfill. The amount, location, and age of the material must be documented and provided to the Administrator upon request. A separate NMOC emissions estimate must be made for each section proposed for exclusion, and the sum of all such sections must be compared to the NMOC emissions estimate for the entire landfill.
A The NMOC emissions from each section proposed for exclusion must be computed using Equation 7:

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