Laserfiche WebLink
Baseline data was obtained prior to ground water pumpage from water well (90-1), and from <br />mining activities from 1991 through the present. Within NSI's lease boundaries, there are three <br />aquifers defined by US EPA as underground sources of drinking water: the Perched, A-Groove <br />and B-Groove Aquifers. The Dissolution Surface Aquifer is not designated as an underground <br />source of drinking water. <br />The Perched Aquifer is characteristically low in total dissolved solids (TDS), conductivity, fluoride, <br />SAR (sodium absorption ratio) and moderate to high in sultate and pH. The A-Groove and B- <br />Groove aquifers are similar in water quality with moderate TDS, conductivity, SAR, but high <br />fluoride. However, the B-Groovc aquifer generally has slightly higher levels of TDS, conductivity. <br />SAR and fluoride. The Dissolution Surface Aquifer is characterized by high TDS, conductivity, <br />SAR, magnesium, potassium, and moderate pll. <br />The following graphs represent analytical results from the past five (5) years for monitor wells <br />located within and immediately down-gradient from the well field. Bicarbonate, Sodium, Total <br />Dissolved Solids (TDS) and Conductivity were selected as the constituents most likely to detect <br />negative impacts from solution mining activities. Except for a few sample specific anomalies, there <br />is little variation in the analytical results. The results from 2006 indicate that solution mining is not <br />impacting the Perched, A-Groove or B-Groove aquifers. <br />The following wells are located within the Well field. <br />Figure 5.2 - Well 90-1 is completed in the A-Groove aquifer and provides the raw water supply <br />to the plant. <br />90-1 <br />10000.000 <br />1000 000 -- +- Bicarb <br />- - Sodium <br />100.000 <br />E <br />ConductiHty <br />10.000 --- -- -1 TDS <br />1 <br />000 <br />. <br />O <br />p <br />O <br />O a aa <br />O O O <br />O ?p fp <br />O O <br />O O <br /> 0 a 0 0 0 0 0 0 O Q Q <br />0 <br /> <br />N <br />E <br />a <br />E <br />; P V, <br />P <br />N E t <br />i <br />N C <br /> <br /> Date <br />Figure 5.3 - Well BG-4 is completed in the B-Groove Aquifer, immediately down-gradient of <br />the 5H cavity. <br />BG-4 <br />1000'.' <br />rFS-s ?-?_s s--? • a • a ? • e.a ??-i • . =ti <br />E 100 -- Nty <br />.. - -1DS <br />10 - t Bicarb <br />Y j h 0 1 <br />O? O? O O O? O? O? <br />14- a?J a 16P y? ar 11a '?, <br />Date