Hanson Material Service proposes to surface mine a 125-acre parcel of lowland prairie in the Des Plaines River Valley for its limestone. Thirty acres of this lowland prairie are wetland, and six acres are high quality wetland consisting of sedge meadow and globally rare wet-mesic dolomite prairie. The high quality wetland is the home of the federally-protected Hines Emerald Dragonfly, listed as endangered in 1995, and the Blanding's turtle, designated in 2009 as endangered in the State of Illinois.
HMS plans to move the six-acre globally rare ecosystem to a non-wetland site somewhere to the south and west of the new Romeoville train station located at 135th Street and New Avenue. The remaining wetland and lowland prairie, important in and of themselves, would be destroyed.