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• 6.0 ENVIRONMENTAL MONITORING AND PROTECTION <br />6.1 Hvdrol gy Monitoring <br />6.1.1 Introduction <br />The monitoring plan is designed to determine impacts of NaTec's mining operation. <br />Based on results of initial 1991 mining and monitoring, future <br />operationslmonitoring will be evaluated. Monitoring activity in 1990-91 exceeded <br />the required BLM, EPA and CMLR (Colorado Mined Land Reclamation) <br />requirements for initial cavities. Figure 2-1 illustrates location of monitoring wells <br />completed in 1989-91. <br />6.1.2 Scooe <br />Hydrology monitoring concentrates on ground water monitoring as there are no <br />perennial streams or springs located on the sodium leases. HRS Water <br />Consultants were Contracted to project the cone of depression based on current <br />plant location and projected water well pumpage rates. An evaluation of possible <br />springs on the lease and pumpage effected areas was conducted in 1990. No <br />springs were found within the cone of depression based on a review of USGS and <br />BLM survey results, and field inventory. <br />6.1.3 Stream Gauging Stations <br />As required by the ROD, NaTec contracted for surface water monitoring of water <br />~ quality and quantity, upstream and downstream of the cone of depression on <br />Yellow and Piceance Creeks. Monitoring was done by the USGS on four existing <br />stations with extensive historical data. <br />r~ <br />45 <br />