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Ms. Rachel Juba April 2, 2021 Page 3 G:\.Clients All\Hugo\Proposals\2021 LaValle AUAR\LTR - RJuba - LaValle AUAR - 040221.docx available based on past studies of the project area, that will be included. If these features would create unique environmental impacts, that will be discussed in this section. Task 5 – Evaluate Project Impact on Water Resources This task covers an analysis for surface water, groundwater, wastewater, stormwater, and water appropriation for the Development Concepts. Information about wetlands will be obtained through readily available desktop data, such as the National Wetland Inventory, wetland delineations, and staff knowledge of the site. As part of the stormwater task, a detailed evaluation of three Development Concepts on water quantity and quality will be completed. This will include incorporating the development plans into a basic stormwater model and evaluating the concepts with local, state, and federal policies. This evaluation will take into account the development area and external drainage area tributary to the project site for the water quantity model. Preference will be placed on utilizing a regional stormwater management approach for the site. The stormwater model developed for the project area will include evaluating the existing and proposed discharge rates, runoff volumes, and potential impact to downstream water bodies. WSB will start with the City’s subwatershed map for th is modeling. The three concept-level storm water management plans to address potential storm water impacts will be developed as part of the AUAR process. For groundwater, existing soils mapping and groundwater information from the USGS will be used to analyze impacts to susceptible groundwater features in relation to proposed land use. For the municipal water and wastewater analysis, the impact of the Development Concepts on water supply and sanitary sewer will be evaluated. WSB will use recent data from the City’s Comprehensive Water Supply and Sanitary Sewer Plans, including the City’ WaterCAD model. This evaluation will be discussed in the AUAR, and a mitigation plan that outlines municipal infrastructure improvements will be included. This work includes: • Estimating water demand and sewer flows per concept based on land use map. • Evaluating the water distribution system to evaluate each concept in terms of system pressure and available fire flow. • Estimating water infrastructure needs. • Evaluating capacity in the sanitary sewer in the area. • Estimating wastewater infrastructure needs including lifts stations and trunk mains. Task 6 – Review of Contamination / Hazardous Wastes Available studies and information will be used to complete this section of the AUAR. This includes information supplied by the City or property owner as well as any other available desktop data. If the concepts include the potential for hazardous wastes to be stored or generated within the project area, that will be included in this section as well. Task 7 – Review of Fish and Wildlife Information from a site visit and the DNR Natural Heritage Database will be used to describe and evaluate wildlife impacts to the area. From the existing information and the field review, the impact of the Development Concepts on these resources will be summarized in the AUAR. Task 8 – Review of Historic Properties, Visual Impacts, and Parks Information from the City, property owner, State Historical Preservation Office, and the readily available public data will be used to determine if there is potential for impact to historic properties or parks or if there will be visual impacts. This task does not include a Phase I archeological site