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CASSLLBERRY CITY COMMISSION Minutes of October 10, 2016 — Regular Meeting Page 10 of 14 A. Golf Course Stoimwater Study Results Presentation and Discussion Staff Presentation: Deputy Public Works Director/City Engineer Kelly Brock explained that in 2015 the City purchased the golf course and due to its being a large amount of strategically located land, one of the City's consultants had been commissioned to look into whether there was potential for stormwater improvements that could help protect the City's lakes system. He added that the timing was right, as the City was embarking on update of its Stormwater Master Plan around the same time. He advised that he was bringing this item to the Commission now, since he anticipated bringing the Stormwater Master Plan scope to the Commission for approval in November of 2016. Dr. Brock then gave a presentation on the Casselberry Golf Course Stormwater Opportunity Feasibility Study which included the following components: Background Analysis Overview o Four scenarios analyzed from a drainage and stormwater pollutant load/treatment perspective ■ Existing condition: 18 hole course with existing stormwater ponds ■ Scenario 1 (lA,lB): keep as 18 hole course but add stormwater improvements ■ Scenario 2: convert to a 9 hole golf course (close eastern half) and add stormwater improvements ■ Scenario 3: replace entire golf course with stormwater improvements and open space o Also examined revegetation and access improvement opportunities (regardless of scenario) Analysis Components o Updated hydrologic and hydraulic (H&H) stormwater model for each scenario ■ Includes identifying changes in flood stages at various points in watershed for various scenarios o Pollutant loading and reduction analysis (for each scenario and individual components within scenario, compared to existing condition) ■ Total Nitrogen (TN) removed per year (lbs TN/year) ■ Total Phosphorus (TP) removed per year (lbs TP/year) o Analyzed components included several pond improvements & alum treatment system o Lifecycle cost/benefit analysis ■ Estimated total construction cost of each component in each scenario ■ Annual operations & maintenance (O&M) cost ■ Total 20 year cost (w/O&M) ■ Nitrogen removal cost: $/lb -TN ■ Phosphorus removal cost: $/lb -TP Results Overview o Some existing project/program numbers for reference: ■ City's best performing baffle boxes