4.3 SR 03-20-2023 - Laserfiche WebLink

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ii. Groundwater — aquifers, springs, seeps. Include: 1) depth to groundwater; 2) if proj ect is within a MDH wellhead protection area; 3) identification of any onsite and/or nearby wells, including unique numbers and well logs if available. If there are no wells known on site or nearby, explain the methodology used to determine this. 1) The depth to ground water appears to vary greatly across the site. During the geotechnical evaluation of the site 22 soil borings were completed across the site. Water tables, wh�en th�ey were observed, ranged fi^om 894.4' to 908.5' MSL. These water tables were all observed in borings taken within or immediately adjacent to wetlands or to open water on site. Water tables typically were not observed within borings taken with�in upland areas. The deepest of which was taken to a depth of 887.3' MSL with no observed water table. A map of the boring locations and boring logs documenting water tables observed is included in Exhibit B— Geotechnical Report. Th�e Minnesota Department of Natural Resources Cooperative Groundwater Monitoring Website maintains clata on ground water levels. The closest observation well to the Project site is DNR Observation Well #86017 (MDH #708372), which is located approximately 2.8 miles southwest of the Project site. The water level in the most recent data record (March 29, 2022) was measured at 859. SI ' MSL. 2) A majority of the Project site is located within the Elk River Wellhead Protection Area (WHPA). The boundary of the ELK River WHPA is illustrated on Appendix A— Figure 8. 3) According to the Minnesota Department of Health — Minnesota Well Index, there are �o identified wells located within th�e Project site. Multiple domestic wells were mapped on adjacent properties, the nearest of which, MDH #SSI578, was located approximately 140 feet east of the Project site. Groundwater resources located within and adjacent to the Project site are illustrated on Appe�dix A— Figure 8. b. Describe effects from project activities on water resources and measures to minimize or mitigate the effects in Item b.i. through Item b.iv. below. Wastewater - For each of the following, describe the sources, quantities and composition of all sanitary, municipal/domestic and industrial wastewater produced or treated at the site. 1) If the wastewater discharge is to a publicly owned treatment facility, identify any pretreatment measures and the ability of the facility to handle the added water and waste loadings, including any effects on, or required eXpansion of, municipal wastewater infrastructure. Wastewater ge�rerated fi^om the site will be discharged into the City ofElkRiver's sanitary sewer system and flow to th�e City ofElkRiver Wastewater Ti^eatment Facility (Facility) located at 248 Railroad Drive, ElkRiver. The Facility is described as follows within its NPDESPermit (M1V0020788): "The Facility has a continuous discharge (SD 001) to the Mississippi River (Class 1 C, 2Bdg, 3C, 4A, 4B, 5, 6 water). This is a Class A facility. Page 9