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Wells within 600 feet of the permit boundary(not owned by the site property owner)are discussed below: <br /> ➢ Carrol Sorrell Well 12462-R-R: This well is northeast of the plant area and is cross-gradient from the site. It is <br /> not expected to see a rise or fall due to the mine. <br /> ➢ Richard Karbowski Well 216684-8: This well is located between the north Freshwater Pond and the Siltation <br /> Pond. During mining of the North Freshwater Pond and Siltation Pond this well may see some drawdown due to <br /> the dewatering process. A monitoring well was installed approximately 250 feet to the west in order to monitor <br /> the effects of dewatering on the Karbowski well. <br /> ➢ Red Tierra Equities LLC Well 13689-R-R:This well is approximately 350 feet east of the Siltation Pond and may <br /> see some drawdown during dewatering of the Siltation Pond. <br /> ➢ United Water and Sanitation District Well 14028-R: This well is located approximately 365' southeast of the <br /> southem Fresh Water Pond. This well is upgradient from the unlined Fresh Water Pond and may see some <br /> drawdown during dewatering operations. <br /> ➢ Gerald Moran Well 187426—A: This well is located approximately 220 feet southeast and upgradient from the <br /> slurry wall lined Cell 2 and north of the Western Mutual Ditch.This well may see a groundwater mounding effect <br /> from the Cell 2 slurry wall on the order of a couple feet. <br /> ➢ Allan Frank Well 206387-:This well is located approximately 520'south west of the slurry wall lined Cell 1. The <br /> well is cross-gradient from Cell 2 and it is not anticipated to see changes in groundwater table. <br /> ➢ Janice Frank Well 14042-R: This well is located approximately 520' south west of the slurry wall lined Cell 1. <br /> The well is cross-gradient from Cell 2 and it is not anticipated to see changes in groundwater table. <br /> ➢ Ben Gutfelder Well 1874250-:This well is located approximately 275 feet northwest and downgradient from Cell <br /> 2. The well may see a groundwater shadow effect from the Cell 2 slurry wall on the order of a couple of feet. <br /> The groundwater shadow effect will likely be mitigated by the wells proximity to the South Platte River. <br /> 5.0 GROUNDWATER MODEL <br /> The MODFLOW program utilizes a finite-difference mathematical model to simulate groundwater flow and was <br /> developed by the United States Geological Survey(USGS). Groundwater Modeling System (GMS V 10.4.10)provided <br /> the graphical user interface for entering and reviewing the MODLFOW data. The model has a total area of <br /> approximately 42 square miles, extending from the South Platte River to the west,the Town of Platteville to the south, <br /> the Evans#2 Ditch to the east and the Town of La Salle to the north (refer to Figure 1). The grid size was set at 200 feet <br /> by 200 feet squares. <br /> The following boundary conditions were applied to the model as presented in Figure 2: <br /> ➢ South Platte River to the northwest(River Package within MODFLOW); <br /> ➢ A constant head boundary to the south; <br /> ➢ A no flow boundary to the east to simulate the rise in bedrock east of Highway 85; <br /> ➢ A constant head boundary to the north; <br /> Groundwater Model Report—Monarch DENM Gravel Mine Site -3- January 2023 <br />