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Groundwater Quality Monitoring Plan <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 /> It is proposed that"control charts" be constructed for each of the selected parameters in <br /> each of the water systems so that annual water quality data can be tracked to evaluate <br /> any potential trends in water quality. For all of the parameters there will be an upper <br /> control limit beyond which a significant change in ambient water quality can be <br /> assumed. It is also proposed that the stream standard for each of the selected <br /> parameters be shown on the control chart, as, for some parameters, stream standards <br /> may have already been exceeded in the background water quality, while, for other <br /> parameters, stream standards are above the expected range of natural variations in <br /> water chemistry. <br /> The control charts and statistical analysis are prepared on an annual basis as additional <br /> water quality data become available from additional sampling events. <br /> 5.0 VERIFICATION RE-SAMPLING <br /> Under certain circumstances a verification re-sampling may be collected, and samples <br /> submitted for analysis using the Groundwater Sampling Plan. The samples will be <br /> collected within four weeks of the analytical report date. A verification sample may be <br /> collected for the following sampling event depending on the frequency of sampling. <br /> Verification re-samples are designed to provide confirmation of the sample analytical <br /> data for sample result anomalies or statistical analysis. <br /> 6.0 REPORTING <br /> A report will be submitted to DRMS within 60 days after the fifth groundwater quality <br /> sample is collected. The report will include a summary of the data collected, statistical <br /> data, and a description of the assessment of data. Control charts are the preferred <br /> statistical method for presenting the data The control charts will be done on all the data <br /> to date. Future sampling reports will be provided to DRMS on an annual basis or at <br /> another approved frequency. <br /> If confirmed exceedances of the statistical methods (control charts)are noted after <br /> regular annual sampling, a specific response plan will be prepared by LGE to address <br /> that issue. The specific response plan will include an evaluation of the number of <br /> selected parameters that show exceedances, the potential variability in the level of <br /> exceedances, and the duration of these exceedances. <br /> VaMOLEN LG Everist Fort Lupton GW Monitoring Plan <br /> aassociarss Page 7 of 7 <br /> 32 <br />