Problem scenario: An industry is located adjacent to Spring Creek (receiving stream in diagram). The industry produces cranberry juice and periodically must rinse the equipment with water to remove residual juice. Estimate the maximum concentration of BOD5 that can be discharged in the effluent from the industry (Cd) in order to stay below the maximum concentration of 4.0mg/L of BOD5 in the creek downstream. The upstream BOD5 concentration is low (Cu=0.70mg/L) because the water is fairly pristine. The upstream flow is 0.22m3/s and the industry discharge is 0.12m3/s. a) ( 2 points) Copy the diagram and draw the system boundary with a dashed line (). b) ( 3 points) Identify each of the six variables by description (word) and by its numerical value. If the variable is unknown, write "unknown" instead of a numerical value. One variable is completed as an example. Qu= upstream flow rate =0.22m3/s c) (4 points) Write the flow balance equation and mass balance equation for the system. No need to solve the equations in this step. d) (4 points) Solve the problem to find the maximum concentration of BOD5 that can be discharged in the effluent from the industry (Cd) without exceeding the permit limits