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Aggregate Industries, Morrison Quarry <br /> Amendment No.7 to Permit M-1973-021 FN <br /> Morrison,CO <br /> mining activities in the South Quarry are expected to encounter and impact groundwater. The <br /> section titled Groundwater, below, discusses the current groundwater monitoring program and <br /> inactive or abandoned monitoring wells in the affected area. Future anticipated groundwater <br /> management activities and planned studies in the South Quarry are discussed in the section <br /> titled Groundwater in the Water Management section later in this exhibit. <br /> These impacts will continue to be addressed during the mining and reclamation phases of the <br /> quarry life cycle. <br /> Groundwater <br /> AM04 summarized hydrogeologic assessments conducted at the site and determined that a <br /> shallow, unconfined water table exists within the fractures in the bedrock that roughly mimics <br /> topography. The bedrock was characterized as low permeability and was estimated to have an <br /> average hydraulic conductivity of approximately 1 x 10-5 centimeters/second. <br /> Current Monitoring Well Network <br /> A monthly groundwater monitoring program began in August 2020 using a series of five wells: <br /> two wells are located at the South Quarry, one well is near the Central Quarry, and two wells <br /> are near the North Quarry. These well locations are shown in Exhibit G.1 and summarized in <br /> Table G-2. Based on the last year of data, groundwater elevations range from approximately El. <br /> 6,400 at the North Quarry to El. 6,588 at the southern end of the South Quarry. <br /> Table G-2. Monitoring Well Summary Information <br /> Well ID/ Date of Location Well Information Water Level <br /> Receipt# Installation (09/25/2020) <br /> Top Depth Bottom Depth Elevation <br /> Elevation (feet) Elevation (feet) (feet) <br /> MW-2019-01 10/2019 East of 6,646.0 246.4 6,339.6 184.7 6,461.3 <br /> South <br /> Quarry <br /> MW-2019-02 11/2019 South of 6,670.0 274.3 6,395.7 81.2 6,588.8 <br /> South <br /> Quarry <br /> MW-2019-03 10/2019 West of 6,689.6 290.0 6,399.6 192.8 6,496.8 <br /> Central <br /> Quarry <br /> 3636623B 01/2009 South of 6,434.5 260.0 6,174.5 35.2 6,399.3 <br /> (R) North Quarry/ <br /> Reservoir <br /> Site II <br /> 3636623C 01/2009 Southeast of 6429.0 260.0 6,169.0 31.8 6,397.2 <br /> (R) North <br /> Quarry/ <br /> Reservoir <br /> Site II <br /> September 2021 1 46 <br />