4.3 SR 03-20-2023 - Laserfiche WebLink

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2.4.1.3 Water Resources Surfa ce Wa ters There is one DNR Public Waters `vatercourses, Trott Brook (M-063-001.5), located within the project aYea. TYott BYook meandeYs in and out of the pYoject site along its westeYn and southeYn boundaries. There are no DNR Public Waters basins, designated wildlife lakes, migratoryT waterfowl feeding/Yesting areas, trout streams/lakes, MPCA oY MDNR listed calcaYeous fens, outstanding resource value waters, and countyT or jurisdictional ditches within or adjacent to the project area. PYominent wateY features located witl�in 1 mile of the pYoject site include the aforementioned Trott BYook as well as two DNR Public WateYs wetlands. These wetlands weYe KlieveY MaYsh (71000300) located appro�mately 0.6 miles south of the project site, and an unnamed basin (71023800) located approximatelyT 0.8 miles to the north. There are no MPCA Section 303d listed impaired waters located within a 1-mile Yadius of the project site. 12 wetland areas, totaling appro�matelyT 71 acres, were delineated on the main Project site and approved by the Local Government Unit (CityT of Elk River) of the Minnesota Wetland ConseYvation Act (Minnesota Rules 8420). A Notice of Decision was issued on November 10, 2021 (LGU PYoject No. W-21-21). Groundwater The depth to ground water appears to varyT greatly across the site. During the geotechnical evaluation of the site 22 soil borings were completed across the site. Water tables, when they were observed, ranged from 894.4' to 908.5' MSL. These `vater tables `vere all observed in borings taken within or immediatelyT adjacent to wetlands or to open water on site. Water tables tyTpically were not observed within borings taken within 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. The Minnesota Department of Natural Resources Cooperative Groundwater Monitoring Website maintains data on gYound wateY levels. The closest observation well to the Project site is DNR Observation Well #86017 (MDH #708372), which is located appro�matelyT 2.8 miles southwest of the Project site. The wateY level in the most Yecent data record (l�ZaYch 29, 2022) was measured at 859.51' MSL. A majorityT of the Project site is located within the Elk River Wellhead Protection Area (WHPA). The boundar�T of the ELK River WHPA is illustrated on Appendix A— Figure 8. According to the Minnesota DepaYtment of Health — Minnesota Well Index, theYe aYe no identified wells located within the Project site. Multiple domestic wells were mapped on adjacent properties, the neaYest of �uhich,lVIDH #551578, was located appro�matelyr 140 feet east of the Project site. Wastewater Waste`vater generated from the site `vill be discharged into the CityT of Elk River's sanitaryT sewer syrstem and flow to the Cityr of Elk RiveY WastewateY TYeatment Facility (Facilityr) located at 248 Railroad Drive, Elk RiveY. The Facilityr is described as follows within its NPDES PeYmit (MN0020788):