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grass continued to produce through August. See Figure 6-1 for illustration of historical <br />precipitation data by month. April typiplly has the highest and December the lowest <br />precipitation. <br />For stream flow analysis, the water year (October-September) is the reporting unit. Therefore, <br />water year precipitation for 1991 (October '90 -September '91) was 9.74", 13.08" for 1992, <br />12.16" for 1993, 10.54" for 1994, 16.T' for 1995, 12.82" for 1996, 20.21" for 1997, 15.35' for <br />1998, 13.41"for 1999, 11.45" for 2000, and 9.02" for 2001. <br />In conclusion, below average precipitation for the water year 2001 resulted in lower vegetative <br />growth and stream flows for irrigation. <br />• <br />6.1.4 Stream Gauging Stations <br />As required by the ROD, (project Record of Decision from EIS), WRN contracted for <br />surface water monitoring of water quality and quantity. Monitoring was performed <br />upstream and downstream of the mining operation on Yellow and Piceance Creek by the <br />USGS on four existing stations with extensive historical data. Funding for the USGS <br />stations was shared with one of the other nahcolite projects in the area. <br />• <br />34 <br />