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Mr. Mark Maloney Apri] 21, 2008 Page 2 The preliminary results of the diagnostic portion of the study were presented to the GLWMO Board during their January 24, 2008 meeting. The Board discussed the potential need for additional field monitoring to help reduce some of the uncertainty with the model calibration and to better access the surface runoff from the yard waste composting site.. Therefore, the GLWMO Board requested that Barr work with RWMWD to prepare a scope of work to perform additional monitoring during 2008, to validate (or recalibrate if necessary), the models developed. for Lake Owasso in 2007, to reduce the level of uncertainty quantifying the sources of pollutants to Lake Owasso, and to evaluate the impacts of best management practices that can help improve the overall water quality of Lake Owasso. The advantages of expanding the original scope include: ® The verification and refinement of the Lake Owasso watershed runoff and pollutant loading model (P8), • Abetter assessment and understanding of the external and internal loading sources to Lake Owasso, • The development of more accurate tools to evaluate the impact of Best Management Practices (BMPs) on the overall water quality of Lake Owasso, and • The ability to estimate the runoff water quality from the yard waste compost site and evaluate its impact on the water quality in Lake Owasso. The following table is a summary of the recommended additional work tasks, including the 2008 monitoring tasks recommended for Lake Owasso and its watershed as well as the validation/recalibration of the P8 pollutant loading model and the in-lake water quality model to 2008 data. Task Cost Tasks 11 a-d -Continued 2008 Monitoring $16,220 Task 12 - Validation/Recalibration of the Runoff and Pollutant Loading Model using 2008 monitoring data $7,265 Task 13 - Validation/Recalibration of the in-lake water quality model using 2008 monitoring data $7,130 Task 14 -Additional Year of Project Management $3,385 Proposed Budget Adjustment for Additional Lake User Survey Work and Unforeseen Calibration Difficulties (existing Tasks 4, 5, 10) $8,600 TOTAL $42, 600 Additional details about each task and why it is important to the study of Lake Owasso is discussed further in the sections below. Attached are also an updated schedule for the completion of the study (Attachment A) and the itemized cost estimates for the proposed tasks that fall outside the original budget for the Lake Owasso UAA study (Attachment B). P:\Mpls\23 MN\62\2362946\WorkFiles\ProjectManagement\ForGLWMO_04212008\Letter_Contract-Revised SCOpe_Apr1121.doC April 21, 2008 Version