A subdivision housing 1000 people is planned that will discharge raw sewage into the bay. Each individual contributes about 0.568 m3 capita-I d-I of wastewater and 113 .4 g capita-1 d-1 of carbonaceous biochemical oxygen demand. (a) The bay inflow has a chloride concentrations of 50 mg L -I . The lake and the bay have chloride concentrations of 5 and 10 mg L -I, respectively. Determine the bulk diffusion coefficient between the lake and the bay. (b) If the BOD decays at a rate of 0.1 d-I and settles at a rate of 0.1 m d-I, determine the steady-state BOD concentration of the lake and bay in mg L -I. Make this determination with and without the subdivision.