@skeletron, you bring up an brilliant option -- thank you! Will look into it. One issue I can think of is that because this basement is well within seasonal high groundwater, we'd have to be mindful of the bouyancy of the geofoam when thinking about how much traditional fill might need to go on top.
@KootK thanks for these ideas.
For suggstions 1-2, the areaway is 20 feet in length and the stairs are 12 feet in length, how close would the spans/beams needs to be in order for us to be able to use a standard basement wall with normal footings rather than retaining wall? Practically, the...
I am designing a basement with an entrance via exterior stairs that go down 8 feet. The bottom of the basement is within seasonal high groundwater mark, so would expect hydrostatic pressure. The side with the stairs is close to the property line, and a cantilevered retaining wall with a 4 foot...