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1 2019 GROUNDWATER MONITORING REPORT <br /> 4 CONCLUSIONS AND RECOMMENDATIONS <br /> Arcadis presents the following conclusions based on the information presented in this report: <br /> • For the March 2019 groundwater sampling event, concentrations of all analytes measured in the two <br /> ' downgradient wells, MW-7 and MW-13, were below the NPLs except for the total iron result for MW- <br /> 7 The concentration of total iron in monitoring well MW-7 was more than 10% over the NPL. <br /> However, no other exceedances were observed and per the revised GMP, resampling of MW-7 is not <br /> required. <br /> • Concentrations of TDS and sulfate are generally decreasing in MW-7 and generally stable in MW-13. <br /> • Generally stable or decreasing trends for manganese, dissolved iron, and potassium to sodium ratios <br /> continue to be observed in wells MW-7 and MW-13. <br /> • Groundwater flow is to the south and velocity is 0.3 foot to 2 feet per year, which is consistent with <br /> historical data. In addition, groundwater elevations and interpreted flow direction are similar to <br /> previous sample rounds. <br /> Based on March 2019 sampling results that indicate there is no discernible impact from the CKD disposal <br /> area and that only one parameter(total iron) exceeded its NPL, Arcadis recommends that groundwater <br /> monitoring continue on an annual basis. <br /> 1 arcadis com <br />