25E - AGMT WATER ENGINEERING CONSULTING

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STATEMENT OF QUALIFICAITONS Additional appurtenant facilities such as ventilation fans, lights, receptacles, security measures (e.g. cameras), etc. will be incorporated Into this facility to enhance the operator's safety. This facility will be equipped with SCADA for remote monitoring and control. Precise control and monitoring of the (6) smaller pump vaults is not as critical, and, therefore it is proposed that these pump vaults are not to be equipped with SCADA in an effort to reduce engineering and construction costs. Six (6) Small Pump Vaults: In addition to the large pumping facility, several local recirculation pumps and aerators are needed to improve and maintain the water quality in Centennial Lake. The approach illustrated in Figure 2 Indicates that (6) small Identical vaults containing (1) small recirculation pump, (1) air compressor (to supply air to the aerators), (1) sump pump to convey nuisance water collected In this vaults, (1) corrosion proof ventilator, and lights/receptacles for operations/maintenance use will be located at various points around the periphery of the lake. Utilizing one design and layout (Figure 3) for these facilities reduces engineering and construction costs. In addition, it makes future maintenance less costly and simplifies maintenance for the operators because the interior layout and components for each vault is identical. All of the piping connections to the vaults will be small (less than 3 -inches) and can be easily picked up on the exterior of the vault and routed to their destination. FIGURE 3. TYPICAL PUMP STATION DETAIL zW LOASM MGMY A "ww�c�aUq '(yvpa, _ _ • � I i � 2 _ ''�� zz''q\.�N�"�i�iaA.�yi�ya -- - ---- i >Y�X' I� �_ ' • �i I� �I��, r�,n�y�.J tips rr� r aS'a .��Op��a • 1� Our approach to the renovation of the pump vaults and electrical wiring is to abandon the existing facilities in place and disconnect/safe-off the existing electrical feed in accordance with current the National Electric Code. There are several load centers around the Centennial Lake facility which power existing vaults with a 240 volt, 3-phase breaker. Once the existing power is disconnected to the existing vaults, the existing breaker can be replaced in the load center and a new feeder circuit can be constructed from the existing load centerto the new small pump vault. A sub -panel is proposed to be located inside each of the small pump vaults to minimize trenching, conduit/wiring, costs, and disruption between the existing load center and the small pump vault. A disconnect switch with a simple combination motor starter (on/off/reset) is proposed to operate the air compressor and small recirculation pump. An integral pressure switch will regulate the on/off cycles for the air compressor. The fractional horsepower blower will operate continuously and can be turned on/off with a disconnect �w DUDEK Proposal for Centennial Lake Renovation 12 25E-25