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Groundwater Quality Monitoring Plan <br /> It is proposed that the water quality monitoring wells be completed with a 2-inch <br /> diameter PVC casing and screen. Typically, the wells are constructed with screening <br /> across the entire water bearing zone, with solid piping to the surface completion. <br /> At least one groundwater monitoring well is proposed as the downgradient water quality <br /> sampling point. The one downgradient water monitoring well will also be considered a <br /> point of compliance (POC) well. <br /> 2.3 Water Level Monitoring <br /> Water level measurements will be made in accordance with this monitoring evaluation <br /> plan. Typically, all monitoring wells will have water level measurements at least on a <br /> quarterly basis. Water level measurements collected in concert with water quality <br /> sampling will serve as quarterly water level measurements for the purposes of this <br /> monitoring evaluation plan. <br /> 2.4 Water Quality Monitoring <br /> Existing wells are currently being measured for water levels and will have water quality <br /> samples collected using the Groundwater Quality Sampling Plan as agreed to by DRMS <br /> and LGE. The proposed parameters listed in Table 1, would be included in the baseline <br /> water quality data collection. Once baseline water quality data is obtained, only certain <br /> monitoring wells will be utilized for the collection of water quality data. Monitoring wells <br /> in upgradient and downgradient positions from the specific phase of mining will be used <br /> to assess whether water quality degradation could be occurring. <br /> It is believed that this monitoring and water quality evaluation plan should focus on <br /> inorganic parameters that are likely to change as a result of the mining operations. The <br /> water quality parameters that are proposed for the water quality evaluation monitoring <br /> program are shown in Table 2. <br /> It is proposed that water quality samples are obtained at least quarterly prior to mining <br /> for the first five quarters. This water quality data will be used as part of the baseline, <br /> while subsequent water quality data, obtained annually, will be compared to the <br /> baseline data to assess water quality variations. The method proposed for the water <br /> quality assessments is discussed in the following section. <br /> 3.0 WATER QUALITY EVALUATION <br /> The proposed water quality evaluation is based on statistical analysis, where the <br /> baseline data is statistically analyzed to evaluate expected natural water quality <br /> variations within each aquifer system. The statistical analysis is necessary to provide a <br /> means to evaluate the expected range of values in the representative baseline data, so <br /> that when future samples are obtained, variations outside the statistical norms can then <br /> be evaluated regarding the potential of water quality degradation from mining activities. <br /> ,�T,',MOLEN LG Everist Monitoring Plan <br /> &ASSOCIATES Page 4 of 7 <br />