J SMITH & T MULI, INC. (2) - Laserfiche WebLink

Home Browse Search

perimeter and water surface elevation at 25ft interval around the lake perimeter at the water surface. The survey team will conduct the hydrographic survey on a 20ft-25ft grid using a boat mounted sonar. JS&TM will perform a detailed aquatic vegetation mapping of existing vegetation present within Carl Thornton Park Lake. The mapping effort will identify and map (locate) aquatic vegetation within the lake footprint. Deliverable: JS&TM will prepare a ift contour interval map of the project area of the park. This map will be used as the base map forthe project construction drawings and exhibits. The construction plan set will include a sheet named Existing Conditions. This sheet will be prepared from the topographic survey. JS&TM will prepare a lft contour interval bathymetric map of the lake within the concrete lake edge boundary. This map will be included in the Lake Condition Assessment Report as an exhibit for the Sediment Analysis discussion. JS&TM will prepare an Aquatic Vegetation Map that will be included in the Lake Condition Assessment Report. Task 4: Lake Liner System Design JS&TM will design a liner system for Carl Thornton Park Lake. The existing lake has a plastic liner that historically exhibits classic liner "elephants" or "ballooning" due to trapped gases beneath the liner that cause section of the liner to float. Carl Thornton Park historically has a high water table. JS&TM will design the appropriate liner system based upon data gathered from the hydrogeologic and geotechnical investigations in Task-1. A clay liner is preferred and far superior to a plastic liner, but the high groundwater may be prohibitive to the construction of clay liner. Alternatively, JS&TM will design a plastic liner system if a clay liner system is not feasible at Carl Thornton Park. The soil analysis results will be used to develop design recommendations for reconstruction of the lake liner as determined from the water balance/seepage loss calculations and the hydrogeologic analyses performed in Task-1. Deliverable: JS&TM will design the appropriate lake liner system for Carl Thornton Park Lake. The lake line recommendations and design parameters will be included in the Lake Rehabilitation Study Report prepared in Task- 5. Construction drawings, plans and specifications will be prepared for the recommended lake liner system and included in the lake construction documents. Task 5: Evaluation and Recommendations Report JS&TM will prepare a Lake Rehabilitation Study Report which will serve as a compilation report for the proposed improvements to Carl Thornton Park Lake. The report will include documentation of each element of the lake study including project background, project goals, City staff input, existing facilities, identified constraints, the recommended rehabilitation plan, preliminary design of each lake system (water quality, lake liner, aeration, circulation, water features, fishery/wildlife enhancements, etc.), cost estimates, CEQA compliance and permitting, lake management guidelines, and technical appendices. This reportwill document research and investigation findings, preliminary design assumptions, guidelines, and criteria developed during the preliminary design process. The anticipated Table of Contents of the report is provided below: • Synopsis • Background • Project Goals and Objectives • Existing Condition of Thornton Park Lake o Identified Deficiencies o Lake Condition Assessment • Recommended Rehabilitation Plan o Aeration System Thornton Park Lake Circulation Study and Renovations Page 10