Talk about slightly low GPA in SOP?

[bigDbag]

I'm applying for a masters program where the average undergrad GPA for the current class is 3.67, but my GPA is a 3.42. My GRE scores are a little above their average by a point or two, and I think I'm going to have really positive letters of rec. My question is, should I talk about my GPA and why it might be lower in my statement of purpose? I don't know if this would do more harm than good. My explanation would be something along the lines of, "two summers ago, I had an internship in X and I found that I really want to do X. Since this internship, my GPA has been a 3.65 and 3.73." I'd word it much more elegantly for the SOP, but you get the idea. Also, it's worth mentioning that I was taking fewer engineering (my major) courses for these two higher GPA semesters than in the previous semesters where my GPA was lower (ranging from 3.2-3.3).