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Vater Lev�l in thg &uthEgn High PI i s <br />esignate in ater assn - 19�� <br />Dakota Aguifer <br />Page 4 <br />In 1999, water level data indicates five wells completed exclusively in the Dakota aquifer <br />experienced a decline ranging from -0.10 feet to -0.80 feet as compared to these 5 wells <br />declining in 1998 from -0.60 to -2.00. Rises on wells completed in the Dakota Aquifer range <br />from +0.10 feet to +4.40 feet. <br />Cheyenne Aquifer <br />The area of greatest decline in water levels of wells penetrating exclusively the Cheyenne <br />aquifer was southeast of Pritchett where a -2.50 foot decline was recorded in 1999 as <br />compared to a Cheyenne aquifer decline of -6.20 feet in 1998 east of Springfield. The range <br />of decline of the Cheyenne aquifer for 1999 was -0.10 to -2.50 feet. The average 1999 <br />decline was -1.07 feet as compared to -2.00 feet average decline in 1998. Rises of water <br />levels of Cheyenne aquifer wells range from +0.80' to +6.20'. In 1999, the average rise <br />equalled + 2.35 feet, as compared to the average rise of + 1.86 feet in 1998. <br />Dockum Aquifer <br />The Dockum aquifer declines range from -0.05 feet east of Stonington to -4.90 feet of <br />decline immediately west of Stonington (as compared with -11.1 feet decline east of <br />Stonington in 1998). The arithmetic average of Dockum aquifer declines over the entire <br />network was -2.20 feet in 1999 as compared to -3.22 feet in 1998, and as compared to <br />-0.51 in 1997. <br />Dakota/Cheyenne Aquifer <br />Water level changes in wells producing from a combined Dakota -Cheyenne aquifer range from <br />a +2.80 foot rise north and west of Walsh to a -4.40 foot decline northeast of Two Buttes. <br />There was no average water level change of Dakota/Cheyenne aquifer wells measured in <br />1999 as compared to -0.98 feet rise for the average change in 1998 . <br />4698R.cr <br />