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8.1.2 Area 2 <br /> Pit dewatering will intercept groundwater from the alluvial aquifer of the Colorado River that is <br /> onsite and route it back towards the river via the exposed groundwater ponds on the Orchard <br /> Grove Industrial Pit. This process is common among sand and gravel pits along the rivers and <br /> waterways of Colorado. The layout of the dewatering process can be found on Map C-3, <br /> including the typical location of the pit pump, its typical installation, and dewatering path. The <br /> pit pump will be a mobile pump with and accompanying diesel generator. This generator will <br /> have an onboard fuel tank with secondary containment. It will typically be located at the <br /> southwest end of the pit,to allow for the shortest pipe length. The pump will be located, <br /> typically,two feet below the active pit floor. It will also be surrounded by a gravel filter. This <br /> configuration minimizes the amount of sediment that is collected by the pumped water. <br /> The groundwater will take water from the pit pump and allow settling time to remove remaining <br /> sediment while also allowing the pumped water to return to the aquifer. This system of <br /> dewatering is proven to move the water out of the way of mining operations while trapping <br /> sediment on site. <br /> 23 114 West <br /> July 2020 G—�7 <br /> / (:nX lawichi and:lssocia(iy rl l.( <br />