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Groundwater Quality Monitoring Plan <br /> Table 2: Example of Indicator Parameters in the South Platte River basin <br /> # Sample <br /> # Analyte Events % Non Statistical <br /> 2010 to Detects Anomaly <br /> 2019 <br /> 1 Alkalinity 25 100 <br /> Carbonate <br /> 2 Antimony 25 100 <br /> 3 Beryllium 25 100 <br /> 4 Cadmium 25 62 Yes <br /> 5 Cobalt 25 80 <br /> 6 Mercury 25 100 <br /> 7 Nickel 25 80 <br /> 8 Nitrite 25 100 <br /> 9 Silver 25 100 <br /> 10 Thallium 25 100 <br /> 11 Vanadium 25 80 <br /> 3.3 Selection of Indicator Parameters <br /> The groundwater data obtained from baseline sampling will provide similar information <br /> that can be used to determine the appropriate analytes for statistical analysis and which <br /> analytes should be excluded in future sampling events. <br /> The proposed set of analytes will be determined after the baseline data is obtained. The <br /> set of analytes will be evaluated on an annual basis and if any anomalous trends <br /> develop for parameters, subsequent statistical analysis will be conducted to assess <br /> anomalous trends outside the expected naturally occurring water quality variability. <br /> 3.4 Statistical Analysis <br /> The water quality database will be preliminarily assessed for representativeness of the <br /> water quality data. Any anomalous, or non-representative, water quality data will be <br /> excluded from the baseline data prior to conducting the statistical analysis. If data points <br /> are excluded, LGE will provide a written rationale to the Division for the exclusion. Once <br /> the representative database has been established, the baseline mean and standard <br /> deviation for each of the indicator parameters will be calculated. The data collected will <br /> provide the standard deviation used to establish a control limit (95 % confidence interval <br /> around the mean), beyond which any changes in water chemistry for that parameter will <br /> be assessed to evaluate if conditions in the mining area may be affecting ground water <br /> quality. <br /> FgAjMOLEN LG Everist Monitoring Plan <br /> &ASSOCIATES Page 6 of 7 <br />