Well, I for one am very happy that the new Wal-Mart will be out of the immediate Folsom area. The traffic congestion around Riley and Glenn is pretty bad due to the Post Office. More than anything Folsom needs a post office with adequate parking. There is always such a traffic jam in the post office parking lot.
Don't hold your breath for any US post office to have good parking or circulation from neighboring streets. When this particular post office was built, the feds submitted their plan to the Folsom building department as a courtesy. I believe the planning commission reviewed it and suggested some changes due to the lack of parking and the poorly laid out driveways, but the feds basically said, "we're providing the plans as a courtesy, you have no input and we're not going to change anything because the US post office doesn't have to go through the local planning process".
That explains so very much about the post office, doesn't it?