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See Figure 6-1 for illustration of historical precipitation data by month. April typically has the <br />• highest and December the lowest precipitation. <br />For stream flow analysis, the water year (October-September) is the reporting unit. <br />Therefore, water year precipitation for 1991 was 9.74", .13.08" for 1992, 12.16" for 1993, <br />10.54" for 1994, 16.7" for 1995, 12.82" for 1996, 20.21" for 1997, 15.35" for 1998, 13.41" <br />for 1999, 11.45" for 2000, 9.02" for 2001, 9.58" for 2002, and 8.99" for 2003. In conclusion, <br />below average precipitation for the water year resulted in less than average vegetative growth <br />and stream flows for irrigation in 2003. <br />6.1.4 Stream Gauping Stations <br />• As required by the ROD, (project Record of Decision from EIS), NSI contracted for surface <br />water monitoring of water quality and quantity. Monitoring was performed upstream and <br />downstream of the mining operation on Yellow and Piceance Creek by the USGS on four <br />existing stations with extensive historical data. Funding for the USGS stations was shared <br />with one of the other nahcolite projects (American Soda) in the area. <br />Data for the 2002 water year (October 2001 -September 2002) was published the following <br />year in 2003 by the USGS. The USGS water data can be down loaded from the USGS web site <br />at http://co.water.usgs.gov. The USGS report (pages 356-367) contains data pertaining to the <br />NSI project. Table 6-1 is a summary of key 2002 data for the NSI site. Historical data indicates <br />all stations (except Piceance Creek at Ryan Gulch, which remained the same) <br /> <br />31 <br />