Building mileage during the competitive season is inimical to both your racing performance and potentially your health (overtraining, injury etc.). Instead, starting from where you are now, build your mileage in a sensible manner; perhaps in 4 or 5 week cycles (I prefer 4 but 5 works just as well). If your starting mileage right now was say, 40 miles per week, your training would look something like: 40, 44, 48, 36. That would constitute a cycle. You have until roughly January before your team meets for workouts. I assume so that should leave plenty of time to build a strong base. After your down week start back at the last successful attempted mileage, so the next cycle would look like: 48, 52, 57, 44. And so on so forth. When you reach your goal mileage (ie. 60 or 70, whatever is comfortable to you) run as so: 60, 60, 60, 54 or 70, 70, 70, 63, you get the idea. During the season, when workouts are added into the mix I'd recommend 1) decreasing your average mileage by 10% (so if 70 mpw was your peak train AT MOST at 63 mpw to avoid both injury and burnout) and 2) I'd adopt the 5 week cycle in season (for the beginning portion where races are less important) so training may look like: 63, 63, 63, 63, 50 (take a big down week to allow yourself to recover, I'd say between 10-15% mpw decrease on the 5th week) and then get back to 60ish mpw. Obviously as you get to the middle of the season where VO2 max work is of less importance and repetitions on the track become the staple workout then I'd further reduce the mileage by another 5-10%. DURING THE SEASON be sure to maintain a long run roughly equivalent to 20% of your weekly mileage to as aerobic maintenance. Come peaking time you will greatly appreciate having done your weekly long run. All in all best of luck to you and I hope this post was beneficial in some way!