Ahmad, R., Kookana, R. S., Megharaj, M., and Alston, A. M. (2004). Aging reduces the bioavailability of even a weakly sorbed pesticide (carbaryl) in soil. Environ. Toxicol. Chem.23, 2084–2089.
Sorry, but you might be interested in our paper on spruce budworm treatment. Carbaryl was the primary insecticide used, and we also has some spills in streams. I thought it might be interesting to you as we used biological indicators (aquatic insects) as one of our monitoring tools.