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CCCf-- <br /> CIVIL RESPURCES <br /> ➢ Irrigation: The site is located in an area of irrigated cropland. Applied irrigation that is not lost to <br /> evaporation and transpiration likely recharges the groundwater. <br /> ➢ Alluvial wells: Other than the eight monitoring wells drilled at the site for monitoring groundwater levels, <br /> there are also eight pumping wells permitted within 600 feet of the mine property.There are three wells <br /> north of the site, three wells east of the site, one well south of the site and one well west of the site. If <br /> pumping, groundwater will be drawn to these wells. <br /> Potential Slurry Wall and Mining Impacts to Local Groundwater Levels <br /> For all lined cells, a properly constructed slurry wall will tend to isolate these cells from the surrounding alluvial <br /> groundwater table. The liner around these cells could cause "mounding" of groundwater (increase in groundwater <br /> elevation) on the upgradient side (south and south east) of the lined cells and a potential "shadow effect" (reduction in <br /> groundwater level) on the downgradient side (north and northwest) of the mine. Because the liner will tend to isolate <br /> these cells from the surrounding groundwater table, the effects of dewatering when mining lined cells will tend to not <br /> extend beyond the liner. <br /> Any mounding effect on the upgradient side of the site (south and southwest) is anticipated to be on the order of a few <br /> feet or less and will dissipate with distance from the mine. Similarly, shadowing effects will be on the order of a few feet <br /> and will dissipate with distance from the mine. The shadowing effects will be minimized by the presence of the Saint <br /> Wain River to the northwest and the Last Chance Ditch that runs between the site and the Varra Pit. <br /> Dewatering of the unlined cells (Cells 1 and 2)will result in decreases in water levels around these cells. Since there are <br /> no wells permitted within 600'of the unlined cells,the effects of dewatering the unlined cells will be minimal. <br /> Area Wells <br /> A review of the permitted wells on file with the State Engineer's Office (SEO), Division of Water Resources (DWR) <br /> indicates that there are eight permitted pumping wells within 600 feet of the permit boundary. All of these wells are <br /> screened in the alluvium. None of these wells are within 600 feet of the unlined cells(Cells 1 and 2) <br /> Wells within 600 feet of the permit boundary are discussed below: <br /> ➢ Varra Companies Inc Well (Permit#74385-F): Located to the west and downgradient of the slurry wall lined Cell <br /> 4. This well may see a groundwater shadow effect from the slurry wall which will be minimized by it's proximity <br /> to the lateral of the Last Chance Ditch that runs between the well and the slurry wall <br /> ➢ Johnson Well (Permit #219284): Located north and downgradient of the slurry wall lined Cell 4 across State <br /> Highway 66. This well may see a groundwater shadow effect from the slurry wall which will be minimized by it's <br /> proximity to the lateral of the Last Chance Ditch. <br /> ➢ Marquez Well (Permit#152561--A): Located north and downgradient of the slurry wall lined Cell 4 across State <br /> Highway 66. This well may see a groundwater shadow effect from the slurry wall which will be minimized by it's <br /> proximity to the lateral of the Last Chance Ditch. <br /> ➢ Kurtz Estates Well (Permit #152516): Located north and downgradient of the slurry wall lined Cell 4 across <br /> State Highway 66. This well may see a groundwater shadow effect from the slurry wall which will be minimized <br /> by it's proximity to the lateral of the Last Chance Ditch. <br />