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A review of USGS stream water quality data indicates no significant change in stream water quality <br />through 2006. Therefore, no effect on stream water quality was noted from the NSI operation. <br />Table 5.1 <br />Historical vs. Current 2006 Data <br /> <br />Total <br />Total Specific conductance <br />(microsiemens/centimeter <br />25° C.) <br />Tem <br />°c. <br /> Dis. Dis. Discharge Discharge <br /> P of 2006 <br /> R* WY** P of R 2005 P of R 2005 WY P of R 2005 WY P of R 2005 WY <br />Station cfs cfs ac ft/vr ac ft/vr Max Max Min Min Max Max <br />6200 Piceance Creek 29.1 <br />below Ryan Gulch (40 yrs) 14.3 21,060 10,990 2,920 1,800 398 1,490 28 15.7 <br />6222 Piceance Creek at 36.1 <br />White River 40 yrs) 16.6 26,130 12,910 10,000 3,910 460 1,960 32 21.2 <br />6242 Corral Gulch near 1.93 <br />Rangely (31 yrs) 0.24 1,400 325 3,000 1,500 271 1,310 29 12.5 <br />6255 Yellow Creek near 3.01 <br />White River (32 s) 1.12 2,180 859 5,790 4,320 457 3,700 35 22.3 <br />Discharge for Water Years in cfs <br /> <br />Station 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 <br />6200 Piceance Creek below 38.90 79.80 Na <br />Ryan Gulch 16.60 11.60 11.60 6.41 6.91 13.40 14.30 <br />6222 Piceance Creek at <br /> <br />White River 48.00 108.00 44.70 <br />19.70 <br />15.80 <br />12.10 <br />5.98 <br />6.55 <br />22.20 <br />16.60 <br />6242 Corral Gulch near <br />Rangely 2.00 5.40 2.36 0.81 0.65 0.55 0.44 0.34 0.81 0.24 <br />6255 Yellow Creek near 4.68 <br />White River 7.35 6.93 5.41 3.44 3.14 2.36 1.80 1.60 1.12 <br />* P of R =Period of Record for collection of data. <br />**WY =Water Year (October-September). <br />cfs =cubic feet per second, average annual flow. <br />5.1.3 Monitoring Wells <br />Per regulatory requirements, dedicated monitoring wells have been constructed to monitor four <br />water-bearing zones, the Dissolution Surface, B-Groove, A-Groove and Perched aquifers, see <br />Figure 5-1 for location of monitoring wells. The aquifers are monitored at five (5) locations; <br />immediately down-gradient of the well field, up-gradient at two locations, remote down-gradient <br />and east in panel 2. <br />9 <br />