I would say it is "base" up until 6-7 weeks out from your most important race if all your doing is tempos and hills. Spend the next three weeks getting your mileage up to 80. Then run about 70 for those 6-7 weeks prior to the most important race. Those 6-7 weeks should be when your doing faster (8k and faster) type workouts that tap your anaerobic system. You only need about 6 weeks to develop it. The week before your big race cut your mileage in half and you should run well.
Schedule
weeks 1-3 (67,74,80 mpw) only tempos, hills, long runs and one or two races
weeks 4-9 (around 70 mpw) intervals, tempos, long runs, and 2-4 races
weeks 10-12 (35-40 mpw) sharpening intervals and goal races