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~~ Data for the 1991 water year (October, 1990 -September, 1991 j was published <br />by the USGS as Data Report CO-91-2. See USGS report, pages 331-343 for data <br />pertaining to the WRNM project. Table 6-1 summarizes key 1991 data for the <br />WRNM site. Historical data indicates three of four stations, except station 6255 <br />on lower Yellow Creek, reported lower than normal flows. The reduced flows are <br />probably a result of louver than average precipitation. The higher than average <br />~ period of record (P of R- flow at station 6255 is interesting, as no significant <br />farming or industrial activity occurred on the Yellow Creek drainage during 1990- <br />1991. Unfortunately, station 6255 has the shortest P of R (not in operation from <br />September, 1982 -May, 1998). During the 1980's, precipitation and surface <br />flows were abnormally Itiigh. Also industrial activity at C-a Oil Shale Tract may <br />have influenced flows during period of record. As a result, no significant <br />conclusions can be developed for increased flows noted at station 6255 for 1990- <br />1991. <br />A comparison of flow from 1990 versus 1991 is also interesting, see Table 6-1. <br />Piceance Creek flow above (Station 6200) and below (Station 62221 the WRNM <br />operation were slightly higher in 1991. But the Yellow Creek flow above (Station <br />6242) and below (Station 6255) the WRNM operation were significantly (greater <br />than 20%) lower in 1991. <br />Review of water quality data indicates no significant change in stream water <br />quality. <br />No effect on stream flow vas noted from the WRNM operation and none would be <br />expected because monitoring wells near mining operation, which feed nearby <br />r1 <br />43 <br />