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Adelaide Landing Residential Development EAW, Hugo January 31, 2017 Surface/Groundwater Appropriations and Dewatering The project is not proposing new water wells, and it is not anticipated that surface waters will be appropriated in quantities requiring a permit. According to the CWI record, one well exists on the site. Well No. 674743 is an 85-foot deep domestic well, which was completed in 2002 (Appendix B). This well will be abandoned in accordance with Minnesota Department of Health (MDH) regulations, and with the necessary permits and approvals. If other active or inactive wells are discovered on the property, they will be field -located, abandoned, and sealed in accordance with MDH regulations prior to site development. Dewatering will become necessary if surficial groundwater is encountered during utility installation. According to data gathered from Unique Well No. 674743, upon installation in August of 2002, static groundwater levels in the southern part of the property are approximately 12 feet below grade. The quantity and duration of potential construction dewatering is not known at this time, but it is expected that necessary dewatering for construction will be temporary. If groundwater is encountered during utility installation, it will be discharged to temporary sediment basins located within the project site. If construction dewatering and pumping from the proposed development exceeds the 10,000- gallon per day or 1,000,000 gallons per year thresholds, a DNR Water Appropriation Permit will be obtained. If it becomes apparent that construction dewatering will not exceed 50 million gallons in total and duration of one year from the start of pumping, the contractor or project proposer will apply to the DNR Division of Waters for coverage under the amended DNR General Permit 97-0005 for temporary water appropriations. It is not anticipated that construction dewatering or pumping from the proposed development will be extensive or continue long enough to require a permit from the DNR, or impact nearby domestic or municipal wells. Connection to a public water supply system The City of Hugo currently has six wells for municipal use, which are permitted under the DNR Water Appropriations Permit Numbers listed in Table 11.2, of which 5 are active. The City of Hugo also has three additional Water Appropriations Permits (2010-0445, 2015-2706, 2016- 0392) for non -crop irrigation use within a mile of the property. Table 11.2. MNDNR Water Appropriations Permit Numbers Permit Well Number 1975-6218 208521-inactive 1975-6218 523948 1975-6218 654497 1975-6218 671642 1975-6218 686272 1975-6218 773400 *Wells in bold represent those within one mile of the Subject Property. 21