DCPCUP-2016-02334 - Laserfiche WebLink

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Mr. bill Buglass ZGEO, LLC Hydrogeoiogic Assessment coomonitoring of groundwater conditions. The findings and conclusions presented in this report are subject to the limitations discussed at the end of the report. RELEVANT ASPECTS OF DESIGN AND OPERATION The proposed site (Site) includes 32 acres of farmland owned by Lloyd and Ruth Klahn and is bordered on the north by Wingra Stone Company, on the west by the C & NW Railroad, on the south by Fox Glen Partners and on the east by CTH MM. The proposed total extraction and operations area is 18.2 acres. The initial extraction and operations area includes approximately 5.4 acres in which gravel will be removed from an elevation of 980— 984 feet above mean sea level (msl) to an elevation of approximately 961 feet msl. Future phase 1 includes approximately 6.1 acres, future phase 2 includes approximately 3.6 acres, and future phase 3 includes 4.1 acres. The draft reclamation plan includes an excavated pond approximately 11.2 acres in area and developable land approximately 20.8 acres in area. According to the operational plans, the Site will be mined for approximately 15 years. Sand and gravel will be excavated to a minimum depth of twenty-five feet below the water table by using a backhoe and/or drag line. Excess water will be allowed to gravity drain from sand and gravel stockpiled at the edge of the excavation discharging back to the excavated pit. There will be no blasting at the Site and fuel and other chemicals will not be stored at the Site. The proposed design includes several features that limit or eliminate the potential for offsite groundwater and surface water impacts from the project: 1. The proposed sand and gravel extraction site is designed for "in the wet" operations, meaning that no dewatering activities/groundwater pumping will be conducted to lower the water table and no discharge of pumped groundwater will be released to surface waters. A well will not be installed as part of the operation. 2. The current project plans indicate that the Site will be isolated from local surface runoff patterns using constructed earthen berms. The berms will be 10 feet high and will surround the operation on all sides with the exception of the area where there are existing structures. The berms will be built during initial Site development. 3. Sand and gravel washing will be conducted with water only, without the use of process chemicals, and no wash water will be discharged from the site. SUMMARY OF HYDROGEOLOGIC CONDITIONS The Site topography indicates that, in general, the west and central part of the property is at an elevation of approximately 984 feet msl. Land elevation decreases at the eastern edge of the property to approximately 976 feet msl. According to Clayton and Attig (1997), the Site has deposits of sand and gravel deposited by braided streams that carried glacial meltwater during the Wisconsin Glaciation. In the area of the Site, sands and gravels were deposited on stagnant ice resulting in hummocky topography. No wetlands or surface water bodies are present at the Site. The four hydrogeologic units of Dane County have been described by Bradbury and others in Wisconsin Geological and Natural History Survey Open-File Report 1999-04. Each of these units consist of groups of stratigraphic units. From shallow to deep, the four hydrogeologic units (lor include: 1) Pleistocene glacial deposits consisting of sand, gravel, till, lacustrine material and c:\rny docs\zgeo 2003\P&D 10/30/03 2