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SCOPE OF WORK AND SCHEDULE <br />• Membrane liners (thermoplastic polyolefin-TPO, HDPE, LLDPE, RPE, CSPE, EPDM, <br />PP, etc.), <br />• Chemical enhancement of existing soil liners (ESS -13, soda ash, sodium <br />tripolyphosphate-STPP, tetrasodium polyphosphate-TSPP), <br />• Soil liners and Soil Enrichment —bentonite clay (sodium rich clay) <br />Deliverable: Lake liner design recommendations (included in study report) and exhibit <br />showing recommended liner improvements, partial preliminary specifications for <br />recommended liner system <br />Preliminary Design Water Quality Treatment Train System <br />Dudek will preliminarily size, design, and layout the water quality system treatment train including <br />up -flow media biological filters, wetland filters, vegetated wetlands, and skimmers. The goal of the <br />water quality system is to provide efficient biological nutrient removal, chemical component removal, <br />macro -pollutant removal (trash and debris). The water quality system components will be sized to <br />provide sufficient treatment capacity to maintain the circulation system water exchange rate/lake <br />turn -over rate. An exhibit will be prepared showing the preliminary sizing and location of major <br />components of the water quality system (skimmers, vegetated wetlands, wetland filters, up -flow <br />media biological filters, etc.) of the water quality treatment system components. The treatment <br />system hydraulics/sizing calculations and preliminary sizing calculations will be provided in the <br />report appendices. <br />Deliverable: Water quality system sizing calculation results (included in study report) and exhibit <br />showing recommended water quality system components and location, partial preliminary <br />specifications for recommended components <br />Lake Water Feature Preliminary Selection and Sizing <br />Dudek will preliminarily sizeldesign a single jet fountain type water feature for Centennial Lake. The <br />sizing of the jet fountain type water feature is dependent upon the desired aesthetics of the fountain <br />including the spray height, pattern; and fullness of the jet. Dudek will preliminarily recommend a <br />fountain head type based upon input from City staff regarding the desired appearance of the <br />fountain. An exhibit will be prepared showing the preliminary spray pattern, typical spray height <br />range, and relative scale of the jet height for the recommended spray jet. <br />Deliverable: Lake water feature size recommendation (included in study report) and exhibit <br />showing recommended water feature location, spray patter; and location, partial preliminary <br />specifications for recommended components <br />Preliminary Lake Management Plan <br />Prepare a general Lake Management Plan that will outline the operations and maintenance <br />requirements for a proposed lake system and suggested modifications in the design to improve the <br />anticipated long-term operation. The elements of the pond that the management plan will address <br />include the shoreline erosion, algae control, aquatic plant management, sediment accumulation, <br />pond water quality feature maintenance, makeup water, vector control, debris and trash <br />control/removal, circulation pumps, and water quality adjustments. A maintenance checklist will be <br />developed and operation schedule for the various items necessary in the pond maintenance <br />program including estimating the frequency of the maintenance requirements. Water quality testing <br />and monitoring program will be developed as part of the pond management program which will <br />identify the different characteristics to be measured in the field. The management plan will provide a <br />narrative of the different maintenance and operation requirements. This general lake management <br />DUDEK Centennial Park Lake Circulation and Aeration Study 13 <br />