Hi Joan,
A 40 mile race in week 1 can fit. When you add a race, also add more recovery before and after the race.
Edits to make to week-1 to fit a Sunday race:
Thurs: Do the workout from week 12 day-2/Tuesday instead of the scheduled ride
Sat: 1 hour easy spin
Sunday: race
The following week-2:
Monday: off
Tues: Do the Monday strength session and miss out the circuits
Thurs – Sunday: If you are still tired from the race add another recovery day. If you can hit the power at the appropriate PE, do the workout on the schedule. Favor rest over training whenever you are not properly recovered for the workout.
Coach Lynda