1.A pristine stream flowing at 100 cubic feet per second (cfs) in the Rocky Mountains contains 5 mg/L of suspended solids (SS). During the spring, ice melt conveys an additional 250 mg/L of SS at a rate of 20 cfs into the stream. Determine the concentration of SS in the stream during the spring.
2.Define the meaningof C•t product. Inaddition to Cand t, what factorsinfluence the rate of chemical disinfection? What kind of microorganism is most readily inactivated byfree chlorine? What kind is most difficultto inactivate?