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D. Understanding / Scope of Services It is our understanding that the City of Santa Ana is seeking a consultant to provide a thorough assessment of Carl Thornton Park Lake, develop a comprehensive renovation plan, and provide engineering services to prepare construction documents plans, specification and estimates (PS&Es) to improve the lake user experience and lake maintainability by addressing existing deficiencies in the lake mechanical water quality control system, biological water quality control system, lake fishery, lake facility improvements (landscape and accessible paths), and the lake ecosystem. We understand the project construction budget is $2.5 million and will seek to develop an efficient renovation program that transforms Thornton Park Lake into an improved valuable community asset within the City budget. JS&TM's approach to developing a renovation plan focuses on an in-depth understanding of the original lake design byJ. Harlan Glenn, thorough research and investigation of the existing conditions, accurate identification of deficient conditions and their causes, and an unwavering focus on delivering a naturalized lake system that is easierto manage and maintain, that is safer, and is a pleasant point of interest for park visitors and the community. The key maintaining a healthy lake is to never use chemicals to maintain a lake like a swimming pool but rather to utilize a naturalized management approach to maintain equilibrium between pollutants and pollutant removal, nutrients inputs and nutrient removal, and between oxygen depletion and oxygen replenishment using natural biological processes that are present in natural lakes. Most of the problems expressed by City staff and observed at Thornton Lake indicate that the lake is out of equilibrium. The rehabilitation plan recommended for Thornton Lake will include recommended improvements to develop a complete Naturalized Water Quality Control System that allow for Naturalized Lake Management. Figure 1 provided in Appendix -A shows 1S&TM's proposed lake features, aimed at developing a Naturalized Lake System that will be easy or City to maintain. The anticipated Naturalized Water Quality Control System elements include the following: • Aeration System • Horizontal Circulation System • Aerobic Biofiltration System • Anoxic Biofiltration System • Aquatic Vegetation • Wetland Filtration • Lake Liner System • Fishery Stocking Plan • Artificial Reefs • Fish Spawning Areas • Vector Control Measures • Waterfowl Population Control Measures • Naturalized Lake Management Guidelines • Lake Adjacent Walkways • Seating Areas • Boat Launch Ramp • Fishing Dock/Pier • Landscape Improvements/ Erosion Control Measures Thornton Park Lake Circulation Study and Renovations Page 7