25E - AGMT WATER ENGINEERING CONSULTING

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STATEMENT OF QUALIFICAITONS staff. The goal of the site visit is to document the existing conditions of the site, note any significant features of the existing site that will need to be addressed in the construction documents and to receive input from City staff and lake management personnel on their preferences and vision for the various elements of the design. The site visit will be conducted like a field meeting with an agenda of discussion topics to make the visit efficient and productive with clear design direction for each element of the project design. We will begin preliminary design by creating a basemap for the site using the 1978 Centennial Lake as -built plans as starting point for the map supplemented with current field data and available aerial imagery. Once the basemap is created Dudek will layout all of the proposed project improvement elements and split the various project elements Into separate drawings to create a 30% complete set of construction plans. The 30% plans will Include the relevant preliminary design Information including the footprint, location, and alignment of all proposed project improvements with callouts to identify each. The 30% design documents are Intended to convey sufficient information to the City to verify that the major project elements are consistent with the project conceptual plan and the project goals. Design Development and CEQA Documentation Phase Upon completion of the 30% design review by the City staff, Dudek will prepare a CEQA document for the project. It is our understanding that the City would prefer to process the proposed project under a Categorical Exemption (CE) pursuant to Article 19 of the CEQA Guidelines. In the event that the City determines that they would like to support the CE with special studies or submit a Mitigated Negative Declaration (MND) instead we have included optional tasks in the scope of work to provide those services to the City; if needed. Simultaneous with the preparation of the CEQA document the design team will move into the 60% Design Development phase of the project. In the Design Development phase, we will perform the engineering steps necessary to design, size, and conduct all necessary engineering calculations to support the design of all electrical and mechanical equipment, pipes, tubes, and conduit. In addition, we will provide sizing calculations and nutrient loading assumptions forthe biological and water quality control system elements including skimmers, biofiiters, wetland filters, aquatic vegetation shelves, and aeration disks. Our proposed design for the lake water quality control system includes several layers of redundancy as identified in the 2016 lake rehabilitation plan. Our proposed lake water quality control system includes design elements that are mechanical, biological, environmental, and sociaVbehavioral. In the Design Development phase of the project we will develop a detailed plan for the Mechanical Water Quality Control System, the most complex part of our proposed lake renovation plan as follows: Existing Large Pumping Facility: The existing equipment will be removed and one of the wet wells will be utilized by OCW D. The othertwo wet wells will be utilized for two larger recirculation pumps that will be operated in a duty and stand-by configuration, which will provide full pumping redundancy. These pumps will operate continuously and be alternated dally so they are both utilized equally. In addition, these pumps will be operated with variable frequency drives (VFDs) to minimize power consumption and achieve the desired flow rate for improved water quality. Hydraulic calculations will be developed to size the pumps/motors and we will coordinate with several different pump suppliers to select pump and motor combinations suitable for this application. DUDEK Proposal. Renovation 25E-24 The use or VFDs will minimize power consumption and achieve the desired Ilow rate to Improve water quality.