Item 17 - Agreement with David Evans and Associates, Inc. for Landscape (10th and Flower Park)

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Proposal to provide Landscape Architectural Design Services for loth and Flower Park — RFP No. 22-124 includes the preparation of one revised plan and rendered conceptual exhibit which incorporates community input. The final color conceptual plan will be a refinement of the City -approved plan. A construction cost estimate and final schedule will be provided and approved by the City prior to commencing work on the PS&E package. Deliverables: Two conceptual plans, one revised / color plan, construction cost estimate, and final schedule. C.2 - Preliminary Hydrology and Hydraulics Analysis DEA will prepare a preliminary drainage study for the project site. A rational method analysis of the site will be performed addressing the pre -and post -construction 10- and 50-year storm events. The rational analysis will determine the pre -and post -construction surface flow and serve as the basis for sizing of on -site drainage facilities to retain the difference in the pre -and post -construction conditions. This analysis, along with the percolation test data provided by the project geotechnical engineer will be used to size the project infiltration system. Deliverables: Up to two conceptual design plans and one refinement of the selected park design including exhibits as denoted above. This task also includes the hydrology and hydraulic analysis report. D. Survey (Topographic) Meyer Land Surveying will perform a field topographic survey and prepare electronic AutoCAD Civil 3D file deliverable for the design team. No hard copy deliverable is included. This portion of the agreement provides for the following: ■ Horizontal and Vertical control will be established to support the project. ■ Horizontal datum will be based on an assumed coordinate system. ■ Vertical datum will be based on Orange County Benchmark nearest to the project (BM# SA-320-89). If required to go farther to locate an existing benchmark, this will be considered an additional service. ■ Cross sections will be located at 25 foot intervals on Flower Street from centerline to east back of walk, on 10th Street from south lip of gutter to south back of walk, and on Garnsey Street from back of walk to back of walk. The southerly limits of the survey will be the southerly property line and its easterly and westerly prolongations. On -site topography will be obtained using a 25'x25' grid. Topographic survey to also include above -ground utility structures, driveways, signs, trees, and other permanent improvements within the project limits. No overhead items or pavement striping are included. ■ Survey dips of up to a total of 3 sewer manholes and 1 parkway drain within the project limits, and if accessible during the field survey. Subsequent trips due to locked or otherwise inaccessible manholes will be considered an additional service. ■ Manholes will be dipped if and only if deemed safe at the time of the field survey by the field survey crew. If deemed unsafe by the field survey crew then locating dip information on these manholes will be considered out of scope and traffic control will be required to be provided by the client. Deliverables: 20' scale Topographic Survey as noted above, ASCII list of survey data, parcel base map in MicroStation Connect format. E. Water Quality DEA will prepare a Water Quality Management Plan (WQMP) report to include treatment flow rate calculations and descriptions of BMPs and treatment systems in order to provide compliance with water treatment requirements. DEA will also coordinate with the City for the LID requirements and provide BMP's with appropriate size based on treatment and peak flow rates. The team will also perform research into site specific conditions such as prior contamination, depth to groundwater, soil conditions, or utility conflicts, that could preclude infiltration. Soil and infiltration testing will be performed in accordance with the Technical Guidance Documents and in cooperation with the OC Watersheds link provided. Both function and form are important aspects of the design and therefore while we consider the site aesthetics, we will also focus on sustainable issues such as groundwater recharge. Deliverables: WQMP as noted above. 8 1 February 28, 2023 1 David Evans and Associates, Inc.