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regression models would fit a straight line to this data set. LOWESS, on the other hand, would plot a <br />smooth curve through the set of data points, indicating a decreasing trend towards the end of data <br />points. A good description of LOWESS may be found on the website: <br />http;_/,/en.wikipedia.org /wiki /Local_, regression <br />Monitoring frequencies for .stream sites have been changed from triannual to biannual. Monitoring <br />frequencies for alluvial wells have been changed from biannual to annual. Monitoring frequencies for <br />bedrock wells will remain annual. These monitoring frequencies will be increased to their previous <br />frequencies (as defined above in this paragraph) one year prior to final bond release. <br />On Table 15 -8, certain ground water monitoring wells were 'suspended' (wells with a single <br />strikethrough). In this case, suspended means that monitoring at a site will be discontinued until one <br />year prior to final bond release. Following is a list of suspended wells, and the reasons for doing so. <br />Well YSAL112 (Sage Creek alluvium): Well is upstream of mining. The 49 samples collected so far <br />have adequately defined upstream conditions. <br />- Well YGAL15 (Grassy Creek alluvium below Pond 011): TDS values have stabilized. Also, Well <br />YGAL16, which monitors the Pond 011 tributary alluvium, will continue to be monitored. <br />- Well YWU16 (Old USGS Well): This Wadge Underburden well is upgradient of mining, is often dry, <br />but never had more the 6.4 feet of water in it. <br />Y..28 and Y..29 wells (both sites have Wedge Overburden, Wedge Coal and Wadge Underburden <br />Wells). TDS values at these wells have either stabilized or are decreasing, and also, these <br />three strata will continue to be monitored at the Y..30 wells. <br />Finally, SCC intends on abandoning (that is, plugging and closing) certain monitor wells. Following is <br />the list of wells to be abandoned, and the reasons for doing so. <br />Well YSAL2 (lower Sage Creek alluvium): This well was never monitored for water quality. This well <br />is adjacent to Well YSAL1, which will continued to be monitored for water quality. <br />Wells YSAL4 and YSALS (mid Sage Creek alluvium): These wells were never monitored for water <br />quality. These wells exist between the discharges from Ponds 012 and 013, and therefore, <br />are not upstream or downstream of the entire mining area. <br />Wells YSAL6 to YSAL9 (mid Sage Creek alluvium): These four wells exist between the discharges <br />from Ponds 012 and 014, and therefore, are not upstream or downstream of the entire mining <br />area. The fifth well in this area, YSAL10, was already abandoned in 2001. <br />Wells YGAL.15 and YGAL18 (Grassy Creek tributary alluviums above Pond 011): These tributaries <br />were never disturbed by mining. Last monitored for water quality in 1994 and water levels in <br />1999. <br />Wells YW7, YOV8, YOV9, YOV10, YW11, YW12 and YW13 (old USGS wells nested together in a <br />site immediately south of the Y..30 wells): Most wells have failed and were discontinued in <br />1993 or 1994 (see Table 15 -3). Wells YW7 and YOV9 are monitored for water levels only, <br />TR -47 32 Revised 4/10 <br />