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Mr. Steve Gatlin November 19, 1993 Page 2 TASK III - Collect Water Quality Information Stormwater run-off water quality samples for a pollutant list to be established will be collected and analyzed after receiving input on quality concerns from the City, the Watershed District, and the MPCA. Samples will also be collected in Langton Lake to establish background levels of target pollutants. Samples will also be collected to calibrate a water quality model that will be developed as part of TASK VI. It is likely taus sampling effort will take place in the Spring of 1994. Analysis costs will be an extra to this task. Estimated Cost $1,800 TASK IV - Complete Preliminary Hydrologic and Hydraulic Analysis of Study Area Utilizing topographic mapping and as-built information, ahydrologic/hydraulic model will be developed to predict stormwater run-off rates and volumes generated within the study area. (The study area will consist of all areas tributary to Langton Lake that are south of County Road C2). A TR-20 based hydrologic model will be utilized to assist in the development of phis information. Stormwater non-off rates and volumes fora 1, 10, and 100-year frequency event will be analyzed. Estimated Cost X4,500 TASK V - Complete Field Survey A field survey will be completed as necessary to further define and refine stage storage and stage discharge relationships for depressions and conveyance systems within the study area. Estimated Cost $2.,(W-. TASK VI- Set up P-8 Water Quality Model A water qaaffity model will be developed that wil3 predict pollutant loadings from the watered as well as treatment basin removal efficiencies. Specifically, this model will- target pollutant loadings and removal efficiencies associated with total phosphorus, total suspended solids, and metals, such as copper and lead. The model will be calibrated baased on literature values and site specific sampling results. Estimated Cost X3,800