Fig. 1. Sample collection locations in the Rock Creek (RC) watershed. Storm runoff was sampled at 12 locations (Sites A-3 though A-11, TA-2, and B-1 through B-3) in the watershed. The A stations were located along the main drainage channel, and TA-2 was located on a tributary to the main channel that enters the creek just downstream from A-11. The B stations were located on the main channel downstream of tributary TA-2.