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ANatural Soda LLC 2017 Project Status Report & Annual Plan of Development <br /> 5.1.3 Monitoring Wells <br /> Per regulatory requirements, dedicated groundwater monitoring wells have been <br /> constructed to monitor four water-bearing intervals identified as the Perched, A-Groove, <br /> B-Groove, and the Dissolution Surface Aquifers. These aquifers are monitored at <br /> several locations across the solution mining area: up and down-gradient, remote down- <br /> gradient, and toward the east near the southeast portion of Section 26. Refer to Figure <br /> 3 and Figure 4 for well locations. <br /> Baseline and current ground water monitoring data have been obtained from <br /> 1991 through present. Within NS's lease boundaries, there are three aquifers defined <br /> by US EPA as underground sources of drinking water (USDW): the Perched, A-Groove <br /> and B-Groove Aquifers. The Dissolution Surface Aquifer has been exempted as an <br /> underground source of drinking water in the NS lease and permit areas. <br /> The Perched Aquifer is characteristically lower in total dissolved solids (TDS), <br /> conductivity, fluoride, SAR (sodium absorption ratio) and moderate to higher in sulfate <br /> and pH. The A-Groove and B-Groove Aquifers are similar in water quality with <br /> moderate TDS, conductivity, SAR, but higher fluoride. However, the B-Groove Aquifer <br /> generally has slightly higher levels of TDS, conductivity, SAR, and fluoride. The <br /> Dissolution Surface Aquifer is characterized by very high TDS and conductivity <br /> (30,000 to >100,000 ppm), higher SAR, magnesium, potassium, moderate pH, and a <br /> generally higher fluoride. <br /> In 2017 the results of groundwater monitoring were analyzed for potential anomalies in <br /> order to prevent or mitigate potential negative impacts to the USDW's. <br /> Appendix A contains detailed sampling results for all ground water monitoring wells. <br /> 5.1.4 Process Ponds <br /> The process ponds at the NS site have a secondary liner, which collect and direct any <br /> condensation or leakage to the leak detection tube for removal. Weekly collection and <br /> removal of leachate continued in 2017. Process pond information is reported on a monthly <br /> basis. <br /> <br /> <br /> <br /> <br /> . <br /> DAUB&ASSOCIATES. INC. ,. 24 January 2018 <br /> II <br />