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Task 6, lJsing the lake m®del, assess likelih®® ®f beneficial use attainment under ulti ate watershed land use c®nditi®ns Expected Cost: $3,050 The calibrated P8 and in-lake models will be used to estimate phosphorus loads and lake phosphorus concentrations assuming ultimate watershed land use conditions. Runoff and lake water quality during wet, dry, and average precipitation conditions will be evaluated to better represent the full range of possible climatic conditions. The estimated im-lake conditions will be used to determine the future attainability of the established beneficial use goals. Task 7: E?ec®mmend feasible alternative remedial measures Expected Cost: $5,040 If in-lake water quality modeling results suggest that water quality goals will not be attained under ultimate watershed land use conditions, the water quality model will be used to predict the benefits of implementing watershed or in-lake BMPs on Lake Owasso water quality. BMP alternatives will be selected based on several factors, including characterization of the in-lake phosphorus budget (the contribution of watershed versus internal phosphorus loads), hydrologic considerations (stormwater rate and/or volume reduction), availability of land for BMP implementation, and soil characteristics at potential BMP sites. It is expected that imacrophyte management may play a role in the recommendations for this lake. If t11is is the case, Barr will include general aquatic macrophyte management recommendations as part of the BMP analysis. Once the BMPs have been analyzed, planning-level cost estimates will be prepared to help determine the cost effectiveness of identified BMPs. Individual BMPs will be prioritized based on overall cost-effectiveness, and a phased implementation plan will be developed. Task Prepare a anagemenf Alternatives ep®rt ®n the Lake wass® iagn®stic®Feasibility Study, with Stakeh®Ider lnv®lvement Expected Cost: $'i 6,870 Creating a Mana};ement Alternatives Report on the Lake Owasso Diagnostic-Feasibility Study will involve generating drafts that describe the work conducted through the UAA process, the UAA results, maps, discussion of management alternatives and concept-level recommendations of remedial measures for the lake. After incorporating the WMO's feedback on the initial draft report, it will be presented at a public meeting in order to obtain feedback. A revised final report will then be generated for presentation at a subsequent public meeting. P:\wr\13\prp\2006\6069 -Lake Owasso\Lake_Owasso_UAA_Scope_Final_Jan 12 07.doc