Manufactured Gas Plants

MGPs produced gas for lighting, heating, and cooking from the 1850’s to the 1940’s. In addition to producing the desired product, gas, numerous toxic by-products (such as tars and purifier wastes) were often stored in subsurface structures or disposed of in the dump areas at the site. Significant amounts of contamination usually occurred at these sites due to the nature of gas production and poor housekeeping. MGPs productions decreased and were phased out in the 1940’s due to the increase network of natural gas pipelines across the country. These plants were decommissioned by razing the building but leaving subsurface structures and wastes in place. There are at least 74 known former MGPs in Indiana. This data set contains mainly the locations of access points to managed sites, along with a unique identifier for each location. In a few instances other features were used as a reference for the location of the managed sites.1850年至1940年间，人工制气厂（MGPs）以生产用于照明、采暖与烹饪的燃气为主。除产出目标产品燃气外，该类工厂还会产生大量有毒副产物（如焦油与净化废渣），这些副产物通常被储存在地下构筑物中，或是直接倾倒在厂区的填埋区域内。受燃气生产的工艺特性与厂区管理不善的影响，这类场地通常会受到严重的污染。20世纪40年代，随着全美天然气管网的不断扩张，人工制气厂的产量逐步下滑并被逐步淘汰。这类工厂在退役时仅拆除了地面建筑，却将地下构筑物与遗留废物保留在了原址。印第安纳州境内目前已知的关停人工制气厂至少有74座。本数据集主要收录了受管控场地的接入点位置信息，并为每个点位分配了唯一标识符。在少数案例中，数据集也采用了其他特征作为受管控场地位置的参照依据。