2023-07-12_PERMIT FILE - M2022048 (2)

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Groundwater Monitoring Plan 1.0 INTRODUCTION LG Everist, Inc is planning to mine aggregate resources from the West Farm property as outlined in the mining permit. The LG Everist, Inc West Farm site, hereinafter referred to as LGE-WF site, has applications for approval of the mining permit. In the LGE-WF site plans, detailed descriptions of the physical geography, geology and hydrogeology have been made. The purpose of this Groundwater Monitoring Plan (GWMP) is to assess the potential of the introduction of pollutants into the groundwater during mining activities and to describe the program to assess if and how water quality may change over time. The plan also provides information about the collection of water level measurements to show water level changes over time. A separate Groundwater Sampling Plan GSP) is prepared and describes groundwater sampling procedures, sample handling, and laboratory analysis. This GWMP will designate what data is collected and how it may be interpreted and may be modified as the mining activities progress and new information arises or changes. The GSP presents the sampling methods used to obtain the groundwater samples. Both the GWMP and the GSP will be followed for all groundwater monitoring done at the LGE- WF site. The Division of Reclamation, Mining and Safety (DRMS) calls for a GWMP for the LGE- WF site for the mining permit. Existing groundwater wells have been used to measure water levels over the past two years. The groundwater well locations, to be used for water level measurements and groundwater quality sampling, are shown on Figure 1, Map Exhibit G-1 —Water Wells Within 200 Feet and are shown on other maps in the mining permit plans. Survey data for the existing wells is in Table 1. Some of these wells on the LGE-WF site will be used to obtain baseline groundwater quality data for the LGE-WF site. Additional groundwater monitoring wells are also planned as shown in Figure 1 and described in Table 2. Groundwater monitoring wells are generally in locations that will not be mined or will not be mined in the near future. New wells or replacement wells will be placed in the general area of the existing well and be installed to monitor the same water bearing zone. 2.0 MONITORING PLAN COMPONENTS The current groundwater monitoring well locations are shown in Figure 1. The well monitoring network includes fourteen wells all completed in the uppermost aquifer. A few of the existing groundwater monitoring wells are in areas that will be mined. These wells will not be used for groundwater quality monitoring and will be removed and abandoned in the future. Monitoring wells are located in up-gradient and down-gradient Fjl®MOLEN LG Everist Monitoring Plan Page 2 of 5