We need to follow all the steps above abcde thank you

a) Draw a simple sketch describing the process. b) Write the inflow and outflow variables and their values (if known) and units. c) Identify the unknowns. d) Write down the material balance equation for each specie. e) Check the formulated math model. If it is i. Determined, solve for the unknowns ii. Under determined, find additional constraints (equations) iii. Over determined, eliminate incorrect, irrelevant, or least important constraints 4. A plant discharges 4000gal/min of treated wastewater that contains 0.25mg/L of PCBs (polychloronated biphenyls) into a river that contains no measurable PCBs upstream of the discharge. If the river flow rate is 1500ft3/s, after the discharged water has thoroughly mixed with the river water, what is the concentration of PCBs in the river in milligrams per liter