Having dug out as much as we are going to, we can clean up next to the foundation, removing loose rock, trimming roots, and spraying it down to wash any loose dirt off.
Then we can form up for the concrete
The concrete calculator again says it should take about 28 bags of concrete, but this time we are getting 50 pound bags from Lowe's (on special) for two trips of $28.64, a total of $57.28. Mix them up and pour them in the form.
The next day we can take down the forms.