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)Nt CAL 010UK/vND S(1- 1ILDUL I- I Dudek will develop three (3) preliminary lake rehabilitation plan alternatives. Development of the alternatives will be based upon the findings of the lake research effort, soil analyses and testing, water quality testing, condition of existing pump equipment/facilities, and input on preferences from the City. The variation in the alternatives will reflect different approaches to meet the same identified project goals. Major physical, design, and permitting constraints will be identified for each alternative. A conceptual exhibit and narrative description will be prepared to present each alternative to the City for input from the City and guidance and selection of the preferred alternative. Deliverable: Three (3) alternative Lake Rehabilitation Plan Exhibits, narrative description of major plan elements, order of magnitude cost estimate for each plan r Dudek will preliminarily size, design, and layout an aeration system to obtain optimum oxygen saturation in the lake. An exhibit will be prepared showing the preliminary sizing of major equipment and location of the aeration pods /discs. The aeration system fluid dynamics /sizing calculations will be provided in the report appendices. Deliverable: Lake aeration sizing calculation results (included in study report) and exhibit showing recommended aeration system components and location, preliminary partial specifications for recommended components Preliminary Lake Circulation System Pump Station Design and Plumbing System Design Dudek will preliminarily size, design, and layout the lake circulation system including the pump vaults /stations and associated equipment. The goal of the system is to provide efficient and cost effective circulation and a sufficient lake turnover rate to maintain optimal water quality in the lake. An exhibit will be prepared showing the preliminary sizing of major equipment (pumps, motors, valves, piping, etc.) and location of the circulation system components. Dudek will also provide an analysis of the expected yearly energy consumption of the circulation pumps. The calculated cost will be provided in the report showing operational costs of the lake. The circulation system hydraulics /sizing calculations and preliminary pump sizing calculations will be provided in the report appendices. Deliverable: Lake circulation pump and pipe sizing calculation results (included in study report) and exhibit showing recommended circulation system components and location, partial preliminary specifications for recommended components Perform a water balance analysis for the lake system which includes the irrigation demands for the project to determine the total water requirements. Water demand analysis will evaluate water demands on a monthly basis for a total year period. A simplified water balance will be prepared that analyzes all the water inputs and withdrawals to determine the amount of "makeup water" required for the lake operation, as well as irrigation demands. The water entering from the project will include both nuisance and stormwater runoff. The analysis will evaluate both average year and dry year conditions. The soil analysis results will be used to develop design recommendations for rehabilitation of the lake liner as determined from the water balance /seepage loss calculations and the soil grain size and chemistry analyses. Lake liner options that will be considered will include but, is not limited to: DUDEK Centennial Park Lake Circulation and Aeration Study 12 25B -14