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<br />Work Scope (cant.) <br /> <br />development between 2004 and 2020. Load reductions from street sweeping will be <br />applied to the total impervious area in 2020 based on the same rate (pounds per impervious <br />acre) determined from 2004 data. <br /> <br />Task 2c. Outline Potential Measures to Reduce Pollutant Loading and Volume <br />Discharge <br /> <br />Once the load assessment model is complete and load reductions for runoff volume, TP and <br />TSS have been calculated, this task will identify potential revisions to development <br />standards to meet the reduction goals. City staff has indicated that retrofitting treatment <br />devices into previously developed areas is a low priority option. Therefore, Wenck staff <br />will focus on revising development standards for future development in order to achieve <br />nondegradation. <br /> <br />BMP selection at this stage will be at a planning level of completeness with a goal of <br />identifying possible structures or activities along with a corresponding budget. <br />Effectiveness of each potential BMP will be evaluated using literature values or values <br />obtained by local governmental agencies. <br /> <br />Task 2d. Estimate Impact on Pollutant Loading and Volume as a Result of Potential <br />Reduction Measures <br /> <br />Wenck has extensive experience in assisting watershed districts in revising rules in order to <br />meet specific performance standards, and this experience is directly applicable to this task <br />of the work scope. <br /> <br />For example, if an area needs a reduction in one or all three parameters, the BMP analysis <br />will start with what is generally considered the most cost-effective methods and work <br />towards the more expensive alternatives. The first step would be to add or enlarge existing <br />ponds and/or infiltration basins and move towards more expensive alternatives like <br />underground storage and treatment. This work would be done in partnership with the City <br />to continually evaluate the practicality of the construction and maintenance of each <br />proposed BMP. <br /> <br />The alternatives for each pollutant parameter would be considered with a budgetary cost <br />screening and review by the City to determine their practicality. For those areas not <br />meeting nondegradation, a BMP implementation plan would be developed to include <br />construction and operations and maintenance costs. <br /> <br />It is important to note that the MPCA has recognized the difficulty in reducing volume back <br />to 1988 conditions and suggests that BMPs focus on resource protection in addition to any <br />volume controls. Consequently, BMPs discussed may include bank stabilization to mitigate <br />volumes as well as potential BMPs to protect wetland hydrology. <br /> <br />Task 3. Recommendations <br />Task 3a. Prepare Draft N ondegradation Plan Report <br />Task 3b. Review Draft Nondegradation Plan Report with City Staff <br /> <br />T:I0598100INonDegradation Proposa!l Wor!< Scope. doc <br /> <br />14 <br /> <br />~Wenck <br />