Residential estimating

I've got a client wanting to fill in a valley next to their yard to create more flat useable space. I think the people are dreaming cause it figures up to about 80 tri axle loads of dirt. This is not commercial job with plans, just having to go out and measure up (nothing is flat all valley and hills) and take an educated guess and figure in enough fluff to cover my ass. I normally don't do any kind of hourly work and like to give a hard number estimate. My question is how do you guys...

Residential estimating

Residential estimating