3.5 miles of intervals

Did 1/2 mile intervals for 3 1/2 miles this noon at Silver lake starting with an easy half (5:00) then a race pace half (4:22) followed by another easy half (5:23) and then a race pace half (4:41). The last 3 halfs were 5:00, 4:25, and 5:30. The 3 mile time was 29:51 (9:57 ppm) and 3 1/2 mile was 35:21 (10:06 ppm). Weather was a sunny and warm 70 degrees.