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advantages with this type of system that would benefit the City. We recommend prior to proceeding with an improvement plan for the refrigeration plant at the Oval, this option be further studied to determine its feasibility. High Pressure Receiver The Vilter High Pressure Receiver is original, in good condition, and could provide service for another ten years with proper maintenance. Evaporative Condenser The evaporative condenser is the original Baltimore Aircoil unit and it has reached its useful life and should be replaced. A cooling tower leak would most likely occur in the heat transfer coils where ammonia gas leakage would be directly into the atmosphere where area residents could be affected. The ammonia piping from the compressors to the condenser is original and should be considered for replacement as well. A potential exists for improving efficiency of the evaporative condenser by utilizing a Variable Frequency Drive (VFD) motor on the condenser fan which will allow the fan to operate at the minimum needed speed to maintain appropriate operating conditions, saving electrical energy from the fan motor. Condenser Water Pumps There are two submersible type pumps located in the indoor remote condenser sump in the refrigeration room that pump water to the evaporative condenser spray nozzles. Water from the nozzles cools the condenser coils then gravity flows back to the remote sump. One pump was replaced about five years ago and could easily operate for another 10 years. The remaining original pump has reached its useful life and should be replaced. If the evaporative condenser is replaced as recommended above, we recommend that the cooling water piping from the pumps to the evaporative condenser be replaced since all equipment is original. At that time, we would also suggest replacing both condenser water pumps. Remote Condenser Sump The remote condenser sump is a cast-in-place concrete tank and still has many years of function remaining before replacement would be necessary. Chemical Treatment System The chemical treatment system for the condenser water was replaced several years ago with WalChem equipment and has at least 10 years of useful life before it will need to be replaced. Electrical Power and Controls The Cutler-Hammer Motor Control Center is original, yet should have about 10 years of useful life remaining. The starter for Compressor No. 2 was replaced a few years ago and it is has become apparent to City Staff that parts for the starters are difficult to find. If replacement parts for the starters continue to be problematic, it may be necessary to replace the Compressor Starters No. 1 & 3 sooner. 131313