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• Data for the 1990 water year (October, 1989 -September, 1990) was published <br />by the USGS as Data Report CO-90-2. See USGS report, pages 311-323 for data <br />pertaining to the NaTec project. Table 6-1 summarizes key 1990 data for the <br />NaTec site. It is interesting to note that maximum temperature for period of record <br />• (26 years) was established in 1990 at station 6200 on Piceance Creek below Ryan <br />Gulch. Three of the four stream gauging stations (supported by NaTec) reported <br />lower flows than normal, but station 6255 on Yellow Creek near White River <br />reported higher flows than normal. For example, the twelve year or period of <br />i record IP. of R.) average flow was 2.27 cfs but in 1990 water year, the average <br />flow was 3.49 cfs. This higher than average IP. of R.) flow was significant, in <br />that other stations (3) monitored for NaTec, indicated lower than average flow. <br />` Also, what makes the increased flow at lower Yellow Creek interesting is that <br />h lower flows were expected as a result of nearly four years of less than average <br />~• <br />precipitation (see Section 6.1.41. <br />No effect on stream flow was noted from the NaTec operation and none would be <br />expected because monitoring wells in the Perched aquifer near mining operation, <br />which feed nearby springs, indicate no water quality or quantity effects resulting <br />from NaTec's injection or pumpage. <br />The next USGS annual report is expected in the spring of 1992. Additional data <br />will be required to develop trends or conclusions regarding the NaTec operation. <br /> <br />46 <br />