Exploration and Production Emission Calculator II (EPEC II) User's Guide The Exploration and Produc tion Emission Calculator Version 2.0 (EPEC II) is a software tool that can be used to estimate emissions for exploration and production facilities. EPEC II integrates user inputs, emission calculations, and data summaries for many equipment types common to exploration and production facilities. The calculation techniques and emission factors utilized by the EPEC II software were, in most cases, established by the U.S. Environmental Protection Agency, API, and the Gas Research Institute. Published references that provide back ground information for the calculation methods used in EPEC II are given for each equipment type in both the software and in each section of this user's guide