I have a job someone wants done in September. They have a slope in their front yard that they'd like filled in with topsoil then seeded with grass. Their front yard is 76 x 40. But this is the total seeding area. The area that needs to be filled in and leveled is 21 x 8. I've come up with a total job bid of about $1600, which includes everything. Is this an outlandish figure? Does anyone have any suggestions? Thanks!