I don't have the answer for that, maybe someone here has it for you or maybe ask it on twitter? You could get a quicker response that way is my opinion...or maybe you can call them directly and find out..
"What is a Municipal Solid Waste Landfill? ... Leachate - formed when rain water filters through wastes placed in a landfill. ... there were approximately 1,908 MSWLFs in the continental United States all ... waster transfer stations and the actions EPA has taken to address this issue. .... Last updated on September 28, 2017."