Base volume

Why not?

^^^ Almost exactly right....I fixed one part, but my bet is you just said it differently than I would.  The truth is, most of us can handle very little hard work proportionate to our overall training.  An injury is waiting at the end of all training done too hard.

jnuger,   When I started working with your coach a year and a half ago he would sometimes tell me that he was thinking of giving me another full week and then a rest week and ask me how I felt about that.  I always jumped on taking a rest week think that I would come out of it rested and refocused.  However, when I look back at the end of the rest week I had sometimes logged more training hours than my full week.  :-).  Instead of doing a 60-minute Bike Trainer workout at an IF (intensity factor) of 75 I would do a 60-minute bike trainer ride at an IF of 65.  Instead of doing a 75-minute run at 7 min/mi pace I would do a 65 minute run at  7min/mi pace.  At the end of those rest weeks, I sometimes felt more fatigued than I did going into them.  I didn't get a full recovery, but things were dialed back just enough that I was able to keep up with the workload that followed.  

The truth is that on the hard weeks I might have 10 workouts in the plan but only complete 8 of them.  During the rest week, I might only have 8 workouts planned but complete all of them because the week wasn't quite as full.  So rest weeks were more productive but not always a full rest.    

As for Training volume question on the OP I would think that after a "B Race" Sprint that you shouldn't be trashed and should be fine with starting your 14-week base build where you currently are at.  The only caution is that you are going to be building so what might seem easy now is going to get more and more difficult as you go.  I feel that one gets more out of starting conservative so he is fresher in the first week or two and can build as outlined in the program than to start at your limit and then after a few weeks having to step things back down because it got too difficult to continue as outlined.  So...if your current training volume feels easy then I would continue from where you are at.  If your current level of training pushes you I would cut back so that you have some easy week at the beginning that will prepare you for the work to come.  The focus is on where you will be at in 14 weeks.  Don't worry as much about where you start as where you want to finish.