I'm designing a retaining wall. I'm going to assume that the soil behind the wall is compacted fill. Can I use a standard density or do I need to test the soil to be more accurate? Also, what angle of internal friction should I use for the backfill? Thanks.
Can someone help me out in trying to obtain the original construction documents to the World Trade Center Towers and possibly WTC7? I tried a search for this topic but didn't show anything. Thanks in advance.