Laserfiche WebLink
I <br />HDR Services <br />1. Conduct a site visit to seethe facilities and space available. <br />a) Document existing hydraulic control features and restrictions between DS -0 and the <br />oxidation pond and between DS -0 and WPCF Headworks, through DS'' -1 to aeration <br />ponds. <br />b) Observe existing electrical and controls infrastructure to determine existing <br />conditions of power, PLC, SCADA instrumentation and control systems, obtain the <br />latest applicable plant drawings (if not available previously), and gather sufficient <br />information and decisions from City staff to proceed with the electrical and I&C <br />design components. <br />c) Determine location of existing utility access and compare to as -built drawings for <br />service connection points. <br />d) Prepare summary reports of the field investigations, including identification of <br />additional information required. <br />e) Identify existing site utilities, metering and electrical and I&C conditions that are <br />relevant to design. <br />2. Hydraulic Modeling. <br />a) Evaluate alternatives to increase the siphon capacity by maintaining the siphon <br />tailwater in DS -0 including: <br />1) Installation of a gravity pipe between the existing DS -0 and the oxidation pond. <br />DS -0 would be expanded to include the new connection, weir, and a bar screen. <br />The CIP identified a 96 -inch pipe. The size of the pipe will be confirmed through <br />the hydraulic modeling. <br />2) Installation of an appropriately sized pump station adjacent to DS -0. <br />3) Upsizing/augmenting the 54 -inch gravity pipe between DS -0 and Headworks. <br />b) Modeling activities include the following: <br />1) Review plant flow data. <br />2) Run simulations to confirm solution. <br />3) Summary Technical Memorandum of initial model results and recommendations <br />for pre- design. <br />c) Evaluate the hydraulic impact of proposed DS -0 improvements on the Water <br />Pollution Control Facility. This will primarily be an evaluation of the existing and <br />proposed hydrographs of flows routed to the treatment plant and flows routed to the <br />Oxidation Pond. <br />3. Meetings <br />a) Workshop with plant staff and Utility engineering group to coordinate project <br />objectives, identify limitations or complicating factors etc. Generate a "long list" of <br />project alternatives (beyond 3 base a[ts.) and make a "short list' of alternatives that <br />could be further evaluated (modeled). <br />b) Conduct two meetings with the Owner. These meetings will be to discuss the <br />hydraulic modeling results and decision-making for selecting a preferred alternative. <br />During the final meeting, the preferred alternative will be selected. <br />4. Provide QNQC of deliverables. <br />rf y of Et,ereN — `i°4FCF�. 1 ;veFS'Oil Structure 0 � (� Scoce of Services <br />