2021-09-07_REVISION - M1973021 (4)

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Aggregate Industries, Morrison Quarry Amendment No.7 to Permit M-1973-021 FN Morrison,CO The monitoring wells installed near the South Quarry will be used to evaluate groundwater levels with respect to excavation depths in the quarry bottom. The well locations were selected to avoid impacts to mining operations and placed in areas where monitoring personnel are not exposed to rockfall hazards. The depth of the two wells range from El. 6,339 to El. 6,395. Once mining Phase IV mining activities are approved, the depth of these two wells will be increased or new wells will be installed to monitor groundwater levels in deeper excavations. Abandoned or Inactive Monitoring Wells In January 2019, the following wells, listed in Table G-3 and located near the Central Quarry, were identified as abandoned and the appropriate forms submitted to the Colorado Department of Water Resources (CDWR). Table G-3. Abandoned Well Summary Information Permit# Date of Installation Depth Elevation 249880 4/8/2002 160 6,480 249881 4/8/2002 70 6,371 249883 4/8/2002 70 6,371 249885 4/8/2002 80 6,500 249886 4/8/2002 80 6,500 249887 4/8/2002 80 6,501 249888 4/8/2002 180 6,569 249889 4/8/2002 180 6,574 249890 4/8/2002 160 6,567 249891 4/8/2002 100 6,492 249892 4/8/2002 100 6,492 According to state records, the wells listed in Table G-4 are also present at Morrison Quarry, but their locations are not known and, therefore, not currently included in the groundwater monitoring program. These wells will be located and closed in accordance with CDWR requirements. Table G-4. Abandoned Well Summary Information Permit#/ Date of Depth Elevation Notes Receipt# Installation 3636623A (R) 1/20/2019 270 Unknown Non-Permitted Need Construction Records 3636623E (R) 1/20/2019 Unknown Unknown Listed on DWR website—Non- Permitted No Permit Application Groundwater well installation and abandonment forms are included in Exhibit G.2. September 2021 1 47