A series of adjustments is required to bring the OEI and TD estimates to the same temporal basis and to accommodate dierences in detected emitters. OEI methods estimate emissions by identifying emission sources, and estimating emissions by one of two methods: (1) estimating activity data for each source and multiplying by an appropriate emission factor (e.g. pneumatic controller emissions), or, (2) using a source-level on-site measurement (e.g. component leaks). Sources were either known (e.g. compressor vents, blowdown stacks, etc.) or are discovered via leak surveys; optical gas imaging (OGI) surveys and a Hi-Flow sampler were used in this phase of the project. In this study, source-level measurements were made where possible (SI Section S-1); other emitters were estimated using emission factors. OGI surveys were conducted throughout the day, typically measuring a source only once (with the exception of the compressor-dependent emitters discussed below), therefore, all emitters were assumed to emit at a constant rate throughout the measurement period.