Between Sunday and Wednesday you're taking 3 hard days with only 1 day of recovery, and depending on your background, the 10 miles might not even be recovery. I wouldn't worry too much about following a weekly schedule like that (Hell, it IS summer), but to do something like the following. This allows you to make sure you get adequate recovery - the most important part of any and all training - without feeling guilty about not working hard enough or such, and then overcompensating and overtraining.
2 days easy
workout - longer duration
2 days easy
moderate long
workout - shorter duration
1 day easy
long
2 days easy
workout - longer duration
off
etc.
You also want to make sure your tempo and threshold paces are based off of your current fitness, not the paces that a 15:20 person would be going. Which is probably even less than you were at last season, seeing as how you probably took some good time off before starting your summer training.