Installation Permits, or Plan Approvals are a type of air permit or general permit that are submitted and approved when a person or company wants to begin construction, installation or modification of a facility and covers all sources of air pollution, process equipment and air cleaning devices. Plan Approvals are obtained prior to receiving an operating permit once the facility has been constructed or modified. While these generally apply to air pollution, there are also some recorded that have to do with water obstructions. For example, one of these notices is for a plan approval regarding the construction of an industrial wastewater treatment facility. Another example of this is a notice that was submitted for the construction of a warehouse situated over two small wetlands.