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r se r c s si ate Introduction Barr Engineering Company proposes to complete adiagnostic-feasibility study of Lake Owasso water quality problems for the Grass Lake Water Management Organization (WMO) using the Use Attainability Analysis (UAA) approach. A UAA is an outcome-based evaluation and planning process that is designed to set achievable goals for water quality and lake use, such as swimming, fishing, or wildlife habitat. Through the process, the WMO member cities, local residents, and other involved stakeholders will gain a better understanding of lake processes and current lake conditions, determine appropriate water quality goals, and establish management practices for achieving those goals. This approach is similar to the methods that we have used in our work for the Ramsey- Washington- Metro Watershed District, Riley-Purgatory-Bluff Creek Watershed District, Nine Mile Creek Watershed District and the Black Dog Water Management Organization. Many of these UAAs have led to successful site-specific BMP construction projects aimed at improving lake water quality and recreational use. The UAA process A UAA involves seven basic steps that seek ways to obtain or maintain optimal water quality conditions and to achieve beneficial. uses. The basic procedure is problem diagnosis, followed by the recommendation of alternative remedial measures. 1. Determine current and historical water quality conditions. 2. Set beneficial use goals. 3. Assess attainment or nonattainment for current watershed land-use conditions. 4. Estimate annual stormwater runoff and phosphorus budgets to the lake. 5. Reconcile the hydrologic and phosphorus budgets to observed in-lake conditions using a lake water quality model. 6. Using the lake model, assess likelihood of beneficial use attainment under ultimate watershed land use conditions 7. If necessary, recommend feasible alternative remedial measures. The deliverable outcome of this process (essentially an 8"' step) is a Management Alternatives Report that discusses the work that was conducted, results, discussion of alternatives, and concept-level recommendations of remedial measures for the lake. The total cost for completing this entire scope of work is $68,610. A detailed discussion of the work tasks associated with completion of the seven UAA steps and a Management Alternatives Report provided below: Barr Engineering Company :ODMA\PCDOCS\DOCS\247725\ I