In what is becoming more and more common occurrence in the Eastern Coal Fields, a site that has been targeted for redevelopment is found to be covered with as much as 60 to 70 feet of uncontrolled mine spoil fills, placed at the conclusion of strip mining activities conducted during the past century. As such, they require deep foundations or a significant ground improvement effort to allow for shallow foundations to support vertical construction at the site. Today, many of these areas are being reused as part of infrastructure and site development associated with the shale gas industry.