This was a volunteer job I did for a local high school. They are going to place a statue under the cap rock. There will be three fountains in front of the statue with a 500 gal pondless retention system. The slabs are from Lynchburg, OH, each weighs between 800-2000lbs. The cap stone is Indian Gray aprox 13'x8' and 10000lbs. All the walls were reinforced with appropriate geogrid and drain-tile. Several drains had to be relocated or installed. From start to the point shown was approximately 4 weeks. Slabs: 220 tons #57 lime no dust: 160 tons DGA: 140 tons Oh and I realize there is a slight slope to the back most portion of the two walls but the front corners are actually level and this job was completed under severe time restraints...and it was free.