Here are what I think are the most likely scenarios.
Option 1: Livan pitches on 4 days rest on the 3rd, Strasburg pitches the 4th. To me this makes the most sense, plus it would give Strasburg/Livan 6 days before their next starts.
2nd - Lannan
3rd - Hernandez
4th - Strasburg
5th - Atilano
6th - Stammen
7th - OFF DAY
8th - Lannan
9th - Hernandez
10th - Strasburg
Option 2 Strasburg pitches the 4th for Syracuse (can't imagine they will start him the day before @ Buffalo), his 5th day would be the 9th, giving Livan 6 days for the 10th OR You can pitch Livan on 5 days on the 9th and Strasburg on the 10th.
2nd - Lannan
3rd - Martin
4th - Hernandez
5th - Atilano
6th - Stammen
7th - OFF DAY
8th - Lannan
9th - Hernandez/Strasburg
10th - Hernandez/Strasburg
I really don’t see the 8th as an option