Definitions and Descriptions Municipal Solid Waste Landfill Unit (MSWLF) - means a discrete area of land or an excavation that receives household waste, and that is not a land application unit, surface impoundment, injection well, or waste pile, as those terms are defined under §257.2. A MSWLF unit also may receive other types of RCRA Subtitle D wastes, such as commercial solid waste, non-hazardous sludge, conditionally expect small quantity generator waste and industrial solid waste. Such a landfill may be publicly or privately owned. A MSWLF unit may be a new MSWLF unit, and existing MSWLF unit or a lateral expansion. Closed Municipal Solid Waste Landfill (CMSWLF) - A discrete area of land or an excavation that has received only municipal solid waste or municipal solid waste combined with other solid wastes, included but not limited to construction/demolition waste, commercial solid waste, non-hazardous sludge, conditionally exempt small-quantity generator hazardous waste, and industrial solid waste, and that is not a land application unit, surface impoundment, injection well, or waste pit as those terms are defined by 40 CFR §257.2. Existence Descriptions - The data sheets for the closed landfill inventory have a section for existence. This definition was used to define the level of certainty that the site existed. Below are the four existence classifications used. Definite: A well-documented site, which reinforces the information, supplied by the local county committee. Generally, metes and bounds are privided. Probable: A site that is less well documented, but that the local county committee believed to be correct. Possible: A site with little or no documentation that the the local county believed to be correct or, a site with documentation that the local county committee had no information about. Doubtful: A site with little or no documentation that the local county committee had no information about.