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Observed Impacts to Groundwater Resulting from the Operation of CBNG Impoundments ANALYSIS OF OBSERVED GROUNDWATER IMPACTS Analysis of the groundwater chemistry of aquifers and of CBNG produced waters can be performed by evaluating posted analytical plots of a variety of chemical constituents present in the water. The analysis of total dissolved solids (TDS) and sodium adsorption ration (SAR) are commonly utilized to evaluate CBNG waters as a measure of suitability