Been there done but I worked T-F and my shifts were 7:30am-6:00pm. Tried to maintain 75mpw but my average was probably closer to 70mpw.
Everyone talking about doubles is crazy. Doing a double on a work day is almost like doing a triple in itself. It would be much better to either to lump it all into singles, but doing the run before work is definitely better. Having it out the way will be a huge stress reliever during the work shift.
Some days you will wake up and not feel like running. If this happens, you can always do a light run (5 miles) after work and then do a double (5 miles) on the weekend when you have a little more free time.This could make up for the missed day although try not to sleep in on workout days.
Make sure and eat a HUGE breakfast if time allows even if it involved food you don't need to cook so save on time. This will drive you through the day. It's fine if you're tired after work because you have to wake up early anyways.
Weekly schedule could look something like this. I would do the long run on Sunday to make sure that you can use Saturday to recover from the work week. Sleep in Saturday if possible. You could reduce T-F days a mile each and then add a double on Saturday if your Saturday is relatively free and you're in a bit of a time crunch in the mornings (or want to get a little extra sleep). Not really sure what you're training for though.
Sunday- 15 mile run (15)
Monday- 8 mile run (8) 23
Tuesday- workout (11) 34
Wednesday- 11 mile run (11) 45
Thursday- 11 mile run (11) 56
Friday- workout (11) 67
Saturday- 8 mile run (8) 75
Sunday- 15 mile run (15)
Monday- 9 mile run (9) 24
Tuesday- workout (10) 34
Wednesday- 9 mile run (9) 43
Thursday- 9 mile run (9) 52
Friday- workout (10) 62
Saturday- 8 mile run (8) 70
5 mile run (5) 75