2024-06-28_PERMIT FILE - M2024034 (5)

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7. Groundwater Groundwater is located approximately five feet below the surface at the Marcovich site. This was determined from wells installed onsite. Table G-4 outlines all wells within 600' of the permit area. These well locations are also shown on Map C-2. Groundwater quality data was gathered in advance of mining. This data and discussion of it can be seen in the Groundwater Monitoring Plan in Appendix G-2. Table G-4. Wells Within 600' of Permit Area Total Distance from Depth nearest mining Applicant/Well ID Permit ID (feet) Purpose area(ft) ELIZABETH A WETHINGTON&CO 197906 30 Domestic Stock 600 WETHINGTON,ELIZABETH A 19458-F-R 34 Irrigation <100 but spotted from quarters EHELNS,WM H 936-WCB 48 Irrigation <100 but spotted from quarters ASPHALT SPECIALTIES CO.,INC. 4000003- 29 Monitoring 0 (HUNT,DAN) MH LELL,J 124421 34 Domestic 0 CENTRAL COLO W CONSER DIST 20005-F 41 Other 375 *Lell,J and Asphalt Specialties wells on the property are under the applicant's control. 7.1 . Groundwater — Monitoring Plan The operator is in the process of collecting the minimum required five (5) quarters of background data to characterize baseline groundwater conditions prior to the start of mining. To-date, data has been obtained from June 2023 through April 2024. This includes 11 of the 13 monthly groundwater elevations (for groundwater quantity) and four(4) of the five (5) quarterly groundwater sampling events (for groundwater quality). This data, along with INS Table 1 -4 Groundwater Quality Standards, is presented in Appendix G-2. Once the initial baseline monitoring period is complete (after June 2024), the GWMMP will be submitted to DRMS as a technical revision. 7.2. Groundwater — Mining Prior to mining, a slurry wall will be installed around the perimeter of the pit to prevent groundwater flow into the mining area. Following slurry wall installation, the operator will mine out the pod by dewatering it via the approved CDPHE discharge point. Pumping to conduct this dewatering will take place during the initial mining and then pumping will cease. Stormwater runoff that is collected may be pumped out to protect local water rights, once sediment has settled. For this reason, the CDPHE discharge point will be maintained over the life of the mine. The pump will be located at least two feet below the active mining floor at the lowest point of the pit. It will be surrounded by a gravel filter. This configuration minimizes the risk of sediment being pumped out of the pit. Marcovich Gravel Pit May 2024 G-5 Lewicki&Associates