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Regular City Council Meeting Monday, October 08, 2007 Page 15 Mr. Lohrenz advised that the first step should be broken into several components: refrigeration plant, cooling tower on the plant that needs to be replaced anyway, and future integration of the rooftop unit replacements with the cooling tower in- stallation. Discussion included cost comparisons and paybacks for a conventional approach versus an integrated approach, with Councilmembers concurring that there was minimal difference in costs with all things considered. Further discussion included benefits of a multiple-stage integrated installation process; advantages of a thermal storage buffer for the ice surface now to improve and maintain. ice quality; other conversion projects completed by the firm; excess energy to be recovered and recycled into other City Hall campus facilities; sus- tainability benefits in the long term by following a phased approach; use of do- mestic hot water needs without a huge cost; and location of GHX in several dif- ferent areas on the campus depending on the most convenient and cost-effective locations. Additional discussion included conversion calculations and reduced carbon emis- sions based on current energy options used in the State of MN, anticipated to change dramatically as more dependence on natural energy sources rather than fossil fuel sources are incorporated; and involvement of Public Works Director Duane Schwartz's expertise in the process to-date. Mr. Brokke advised Councilmembers that it was staffls plan to prepare for the City Council's next meeting a list of advantages and/or disadvantages of each and all costs that can be identified by staff to allow the City Council to make an in- formed decision on this complex issue; and to determine immediate or short term versus long-term financial gains to be realized. Mr. Brokke noted that this could also lead to further Council policy discussions based on green technology per- spectives. Councilmember Pust observed that, from a business perspective, the City of Roseville would be around and could recapture long-term benefits, making the options presented more attractive. Councilmember Pust noted that local govern- ments were being mandated to meet renewable energy thresholds by 2014, and the Council should determine their options and link that mandate into future deci- sions. City Attorney Anderson's advice was sought on those mandates; however, he ad- vised that he would provide the requested information at the next meeting, follow- inghis research of the mandates as addressed by Councilmember Pust.