Hello could you help me answer this?

Question 5 Up until the 1950s, most of the Parramatta River was swimmable and the river was the focal point of many social activities. Since then, the rivers condition has deteriorated and is currently in an impaired state, with only few locations where people can still swim. With western Sydney facing strong population growth, there is a growing need for active public spaces where the community can swim and relax. In addition, through initial community consultation, it became apparent that being a swimmable river meant more than just swimming, but also a desire to enjoy the social, amenity and biodiversity benefits of the river.

Your task is to explain how you would develop a cost benefit analysis for the plan to Make Parramatta River Swimmable Again. In your answer, you need to consider the steps of a CBA, valuing costs and benefits, non-market valuation, sensitivity analysis, and the discount rate. You could, but do not have to, provide actual numbers. Your task is to explain how you would conduct the CBA using CBA principles. A good way to approach your answer is to work through the steps of a CBA.