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Groundwater Quality Monitoring Plan <br /> 1.0 INTRODUCTION <br /> LG Everist, Inc is planning to mine aggregate resources from the West Farm property <br /> as outlined in the mining permit. The purpose of this Groundwater Quality Monitoring <br /> Plan (GWMP) is to assess the potential of the introduction of pollutants into the <br /> groundwater during mining activities and to describe the program to assess if and how <br /> water quality may change over time. The plan also provides information about the <br /> collection of water level measurements to show water level changes over time. <br /> A separate Groundwater Sampling Plan is prepared and describes groundwater <br /> sampling procedures, sample handling, and laboratory analysis. This GWMP will <br /> designate what data is collected and how it may be interpreted and may be modified as <br /> the mining activities progress and new information arises or changes. Both the GWMP <br /> and the Groundwater Sampling Plan (GSP) will be followed for all groundwater <br /> monitoring done at the LGE-WF site. <br /> The Division of Reclamation, Mining and Safety (DRMS) calls for a GWMP for the LG <br /> Everist —West Farm (LGE-WF) for the mining permit. Existing groundwater wells n used <br /> to measure water levels over the past two years. The groundwater well locations are <br /> shown on Figure 1, Map Exhibit G-1 — Water Wells Within 200 Feet and are shown on <br /> other maps in the mining permit plans. Most or all of these wells will be used to obtain <br /> baseline groundwater quality data for the LGE-WF site. Additional groundwater <br /> monitoring wells are also planned as shown in Figure 1. <br /> Groundwater monitoring wells are generally in locations that will not be mined or will not <br /> be mined in the near future. New wells or replacement wells will be placed in the <br /> general area of the existing well and be installed to monitor the same water bearing <br /> zone. <br /> 2.0 MONITORING PLAN COMPONENTS <br /> The current groundwater monitoring well locations are shown in Figure 1. The current <br /> system includes seven wells completed in the uppermost aquifer. A few of the existing <br /> groundwater monitoring wells are in areas that will be mined. These wells will not be <br /> used for groundwater quality monitoring. Monitoring wells are located in up-gradient and <br /> down-gradient positions in the alluvium. Additional monitoring wells may be included in <br /> the future as necessary, or in response to regulatory concerns. <br /> Water quality monitoring sampling will begin within the next quarter following regulatory <br /> approval or consensus from DRMS. As proposed, the data collected will be used to <br /> develop a baseline of data for which future comparisons can be made. Once the <br /> baseline data collection is completed, then future water quality samples collected from <br /> points downgradient of the mining operations can be used to assess potential changes <br /> in water chemistry that might cause overall changes in water quality downstream. <br /> F�T1,MOLEN LG Everist Monitoring Plan <br /> S ASSOCIATES Page 2 of 7 <br />