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The document distinguishes between dry gas (primarily methane) and wet gas (methane mixed with marketable higher hydrocarbons like ethane, propane, and butane). It identifies gaseous wastes including hydrogen sulfide, sulfur dioxide, methane, and carbon dioxide. It further details liquid wastes, specifically produced water, which can contain carcinogenic chemicals, salts, and naturally occurring radioactive elements such as radium and uranium, noting that many wastewater treatment plants lack the capacity to remove these radioactive chemicals to meet federal drinking water standards.

The document outlines three primary geothermal heat extraction methods: conventional hydrothermal systems, Enhanced Geothermal Systems (EGS), and Closed Loop/Advanced Geothermal Systems (AGS). It clarifies that Superhot Rock (SHR) is a resource characterized by temperatures at or above the supercritical temperature of water (374°C for de-ionized water), which can be accessed using either EGS or AGS methods.