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2 <br />Colorado Division of Reclamation and Mine Safety (CDRMS) defined Numeric <br />Protective Levels (NPL) and Early Warning Indicators (EWI) are shown for each <br />constituent at each well where these statistical values apply. <br />Up- Gradient Alluvial Well 28 -1— Total Dissolved Solids <br />Comparison of the data values with the Early Warning Indicators (EWI) and the <br />Numeric Protective Levels (NPL) indicates one data point for total dissolved solids <br />elevated above the EWI at up- gradient alluvial well 28 -1. The sample, collected in <br />June 2012, was reported with a value for total dissolved solids of 5,460 mg /L. The <br />calculated EWI for this constituent at this monitoring point is 5,407 mg /L, a <br />difference of 53 mg /L. The baseline mean value for total dissolved solids for this <br />well is 3,958 mg /L computed from 15 baseline samples. The maximum value for <br />dissolved solids observed in the baseline program was 4,380 mg /L. The <br />operational mean value determined from 86 samples is 4,574 mg /L. The value of <br />total dissolved solids at alluvial well 28 -1 has never been above the calculated <br />EWI before in the operational period of record. The historical record of total <br />dissolved solids samples versus the ground water elevation at up- gradient alluvial <br />well 28 -1 is provided in the following hydrograph: <br />