I direct buildings and grounds at a new school in Massachusetts. The building site had a demolished building on it and had become a drinking hangout prior to or construction. The contractor recycled the topsoil screening it before re-spreading it. After the rain, as the fines settled, glass and other debris began to appear on the surface (mostly 1/2 to 1 inch size pieces). The general contractor thought that establishing a lawn would keep the glass from surfacing, but due to poor quality of the soil (sanding with low organic matter content) the lawn has been very slow to establish and glass keeps surfacing. Any thoughts on remedial action short of removing 6 inches of soil and replacing it all? Does anyone have any experience with trying to keep glass and other debris from working its way to the surface? On contractor suggested Harley raking followed by Terra seeding to top dress and seed. We are dealing with approximately 3/4 of an acre. We are looking for a solution that will create a safe lawn / playgound at the most reasonable cost. I would appreciate any advice and expertise.