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action will be taken to identify and correct the problem. Potentiometric data for monitor <br />wells without pressure transducers will be collected manually on a quarterly or annual <br />schedule, depending on the proximity of the monitor well to the production well field. <br />Water levels taken by depth sounder will be obtained through visual and/or audio response <br />of the instrument. In the active mining areas, the DS pressure transducers will be verified <br />monthly. Outside the active mining area, manual water levels are collected at least <br />annually. <br />2.1.4 Groundwater Quality <br />All groundwater monitor wells will be sampled pursuant to the NS Sampling Analysis Plan <br />(SAP). Field data (pH, temperature and conductivity) and other observations will be <br />recorded during each sampling event. Sampled groundwater is analyzed for constituents <br />which are characterized into major and minor groupings. A list of the major and minor <br />constituents is provided in Table 1. <br />The analytical lists may be updated as deemed necessary by any of the three regulatory <br />agencies. For monitor wells located outside the well field (remote monitor wells), sampling <br />will continue for a minimum of three years after project cessation. Sampling frequency of <br />remote monitor wells will be conducted on an annual basis. NS will submit a request to <br />discontinue sampling for in -field wells no sooner than three (3) years after cessation of <br />mining within the area which is being monitored. <br />2.1.5 Water Monitoring Plan <br />NS personnel or their contractors will typically draw groundwater samples using dedicated <br />samplers from approved completion zones. Dedicated water quality monitoring wells will <br />be equipped with a bladder pump, nitrogen gas -lift type well sampling device, or other EPA <br />approved sampling method. The sampling methods are discussed in detail in the NS SAP. <br />2.1.6 Monitoring/Reporting Contingency Plan <br />The monitoring frequency may be increased to at least once -per -month if recorded values <br />indicate that the monitored zones have been affected by the mining operations. Field <br />measurements may be taken and the samples may be analyzed for major constituents. The <br />first sample may include minor constituents. <br />Daub & Associates, Inc. Page 7 Natural Soda LLC 2015 EMP <br />