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rationale and monitoring requirements, and will determine the extent and duration of <br />subsequent monitoring. <br />2.2 Seeps, Springs, and Precipitation <br />There are no known seeps or springs located within the NS Sodium Lease boundary, or in <br />the surface projection area of the cone of depression for existing and proposed water <br />supply wells. <br />NS will monitor precipitation and collect data with at least one weather station on the <br />sodium lease area. <br />2.3 Stream Gauging Stations <br />NS, through a cooperative agreement with the USGS, provides funding via Rio Blanco <br />County for the operation of four stream gauging stations. Stations are located upstream <br />and downstream of the NS operation on the Piceance and Yellow Creeks. Figure 4 <br />illustrates the locations of the stations. USGS personnel collect stream flow data and water <br />quality samples for periodic analyses. The samples are analyzed for the chemical <br />parameters that are listed in Table 2. <br />The gauging stations have an extensive, long-term database consisting of more than <br />twenty-five years of data collection. Natural or artificial control devices are utilized to <br />facilitate water level readings acquired with a continuous level recording unit. <br />If the water quality deviates significantly from historical baseline conditions, sampling <br />frequency may increase as directed by the BLM. NS will propose monitoring changes if <br />variations are detected in water quality or flows that are not a result of natural fluctuations; <br />but variations that are directly attributed to NS mining operations. <br />Daub & Associates, Inc. Page 9 Natural Soda LLC 2015 EMP <br />