2015/12/23 Council Agenda Packet

2 HDR Services 1. Pump testing: Work with the Owner's staff to conduct a pump test. a) Pump testing will include field measurements of surface level elevations in various lagoons and channels to better define hydraulic throughput in the system for submerged hydraulic structures. It may be necessary to run the FEN pumps at a steady flow rate for an extended period to obtain stable data. Pump test will be completed during the allowed higher flow period, between November and June. 2. Field investigations for the following: a) Existing electrical and controls infrastructure to determine existing conditions of power, PLC, SCADA instrumentation and control systems, obtain the latest applicable plant drawings (if not available previously), and gather sufficient information and decisions from City staff to proceed with the electrical and l&C design b) Hydraulic control features and restrictions between the oxidation pond, polishing pond, and chlorine contact channel. c) Existing effluent pumps, discharge piping and dechlorination building. d) Determine location of existing utility access and compare to as-built drawings for service connection points. e) Prepare summary reports of the field investigations, including identification of additional information required. f) Identify existing site utilities, metering and electrical and I&C conditions in the various facilities (Chlorine Building, FEN pump station, Dechlorination Building) and elsewhere that are relevant to design. g) Prepare a proposed Single-Line Electrical diagram and a PLC/Control System Block diagram as part of the investigation to communicate the overall direction of electrical and I&C. 3. CFD and Hydraulic Modeling. a) The field investigation phase will include preliminary Computational Fluid Dynamics (CFD) or hydraulic modeling of primary hydraulic features. The CFD analysis is to be performed using three-dimensional commercial software known as Flow-3D (licensed by Flow Science Inc, Santa Fe, NM). The software should provide a high level of accuracy in simulating flow patterns in pumping station wet wells and channels. Additional hydraulic modeling, including development of the project hydraulic profile, will be completed using HDR's plant based hydraulic analysis program, Visual Hydraulics, as well as desktop calculations. The objectives of the preliminary modeling are: 1) Identify modifications required to increase capacity of the effluent pumping station to 60 MGD. 2) Determine potential flow restrictions between the oxidation pond, polishing pond, and chlorine contact channel. Evaluate options for increasing flow and removing restrictions, with new hydraulic pathways between each feature, 3) Evaluate chlorine mixing and contact time in the existing channel in preparation for 30% ', sic I.