Today i met with a customer that wanted a very large project completed. It included a retaining wall and a large amount of escavation. What would you quote on this. Remove 300 yds topsoil. Install a retaining wall - 150 ft long. 6ft high. Install approx 20 yds compacted gravel for base for a parking lot. Customer wants to expand his parking lot. Dump site for soil is about 15 min. away. Using 85lb retaining wall blocks. 18" long, 12" deep.