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6.0 ENVIRONMENTAL MONITORING AND PROTECTION <br />6.1 Hydrology Moni orin <br />6.1.1 Introduction <br />The monitoring plan is designed to determine impacts of WRNM's mining <br />operation. Based on results of initial 1991-1992 mining and monitoring, future <br />operations/monitoring will be evaluated. Monitoring activity in 1990-1992 <br />exceeded 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, WRNM 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 /> <br />42 <br />