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The Kansas City Former Manufacture Gas Plant began operation in or around 1883. Conflicting information suggests that gas production ceased in 1906,; however, the FMGP was maintained in "stand-by" status until at least 1913. The site was generally razed in a phased manner between 1950 and 1968. The site currently is the location of a maintenance shop.

Kansas Gas Service (KGS) a.k.a. ONEOK and now known as ONE-Gas Inc., entered into a Consent Order in October 1994 after having completed a preliminary assessment (PA) in 1993. Investigations subsequent to this PA and signing of the Consent Order include: 1997 Site Investigation (Black and Veatch); 1998 Remedial Investigation Sampling and Analysis Plan development (Black and Veatch); 1998 Remedial Investigation Report RETEC); 2000 Groundwater Remedial Investigation Report; and, 2002 interim Removal Action Plan (RETEC) .

Results of these studies confirm the presence of both soil and groundwater impacts from historic FMGP operations. Heavily contaminated materials, including FMGP source materials, were identified within the two below-grade gas holders. An Interim Remedial Action Plan (RETEC 2002) was prepared by ONEOK and approved by KDHE in 2002. Removal activities were started October 30, 2002 and were completed December 23, 2002. Approximately 4,300 tons of consolidated waste impacted material were transported to a thermal destruction unit (TDU) facility in Cedar Rapids, Iowa. 50 tons of scrap metal, debris and rubble were transported and disposed of at the Lone Mountain, Oklahoma hazardous waste facility. All liquid residuals and water were included in the consolidation process and transported to the Cedar Rapids TDU.

Groundwater monitoring continues and shows continued impacts to groundwater from FMGP associated constituents, though analytical results show decreasing concentration trends. KDHE and ONE Gas Inc., continue to coordinate development of a final remedial strategy for the site that addresses residual soil and groundwater impacts. In the interim, ONE-Gas plans to perform a Supplemental Site Investigation (SSI) late Fall (2024) to early Summer (2025).