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6.0 ENVIRONMENTAL MONITORING AND PROTECTION <br />_~ <br />6.1 Hvdrologv Monitoring <br />6.1.1 Introduction <br />The hydrology monitoring plan is designed to determine impacts of NSI's mining operation. <br />Based on results of mining from 1991-2003 future operations/monitoring will be evaluated. <br />Figure 5-1 illustrates location of monitoring wells completed in 1989-2003. <br />6.1.2 Scope <br />NSI's hydrology monitoring program concentrates on ground water, as there are no perennial <br />streams or springs located on the sodium leases. The USGS stream gauging station- <br />. monitoring program is conducted, with NSI support, to provide regional stream flow data. <br />6.1.3 Precipitation <br />Precipitation gauges are located near injection well 90-5 (tipping gauge) and near monitoring <br />well EX-2 (V-gauge). Based on perennial vegetation, which is an indicator of long-term <br />precipitation, the "normal" precipitation for the NSI site is 12-14 inches per the calander year. <br />The distribution of precipitation is important for reclamation. <br />I • 29 <br />