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SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> Table 10-3 is a summary of analytical results and Table 10-4 shows data summary statistics. <br /> Table 10-5 summarizes consistent detections, non-detections, and BSGW exceedances for <br /> constituents in the groundwater samples collected from the monitoring wells. Note that some <br /> detections occurred at or above the MDL, but below the PQL. <br /> A complete Tier I data validation was not performed for the analytical data. However, as a <br /> general quality control measure, cation-anion balance (CAB) and TDS ratios were evaluated for <br /> each sample analyzed. The results were as follows: <br /> • MW-SUN1: <br /> o CAB: 6 samples exceeded 10% (highest value 16.4%) <br /> o TDS Ratio: 2 samples exceeded criteria of 0.90 to 1.10 (0.612 and 0.651 <br /> 9/24/2013 for SMW1 Final and SMW11) <br /> • MW-SUN2 <br /> o CAB: 8 samples exceeded 10% (10.3 to 59.3%) <br /> o TDS Ratio: 6 samples exceeded criteria of 0.90 to 1.10 <br /> • MW-SUN3 <br /> o CAB: 9 samples exceeded 10% (39 to 53.1%) <br /> o TDS Ratio: 1 sample exceeded criteria of 0.90 to 1.10 <br /> As observed, the CAB for a number of sample data sets exceeded 10%. The preferred <br /> acceptable criteria is for CAB not to exceed 5%. There may be a number of reasons why the <br /> CAB exceedances occurred, one of which could be related to the relatively high pH and <br /> parameters associated with alkalinity or interferences from other ions. Data with a high CAB <br /> should be considered as estimated. <br /> An examination of Table 10-3 shows some unusual inconsistencies in concentrations of some <br /> common ions, mostly within well MW-SUN1. These include the constituents of bicarbonate, <br /> hydroxide, chloride, nitrate, and sulfate. <br /> Bicarbonate, which is a common constituent and the dominant contributor to alkalinity in most <br /> groundwater, ranges from non-detected to 293 mg/L in well MW-SUN1, from 212 to 538 mg/L in <br /> well MW-SUN2, and from 197 to 375 mg/L in well MW-SUN3. <br /> Hydroxide concentrations in well MW-SUN1 were non-detected in early samples, but then <br /> showed concentrations ranging from 126 to 182 mg/L (even when multiple samples were <br /> Western Water S Land, Inc. 35 <br />