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• pumpage effects, i.e. A Groove dewatering and an example of potentiometric WL recovery <br />following reduced pumpage, can be noted on Figure (3-7. <br />The Dissolution Surface WL changes have been correlated with mining activity. <br />Following use of submersible pumps in cavities #1A, 3A, and 4A in 1995 - 2001, the <br />WL in EX-2 and other Dissolution Surface wells has significantly declined. <br />Submersible pumps provide the ability to control recovery and balance net flow in and <br />out of cavities. <br />The following information summarizes potentiometric water level data from ground surface, <br />for monitoring wells immediately down~ip of solution mining activity: <br />10.90 1091 12!94 11196 1 tA7 11198 12199 1?/00 <br />signified E,ma,em E,aa,dm E,aa,am i~dad <br />Prig Rrr~e 3hu01oarr 0~ <br />Felled = 310' WC +2 (3061 -13 (323') -13 (3231 ~4 (3141 -2 (3127 ~6 (316') ~ (31r7 <br />PrGrOfAC = 445 30 (475) 5 45~ -26 (4711 -24 (4691 -25 (47~ ~ (4~7 -19 (~~) ~ (4~') <br />B-Grove = 445 -13 (46Z) E (455') -13 (4621 -14 (4611 -10 (4591 '7 (`4.,G') -10 (453') -11 (4fiU) <br />Dssdutim = 459' WC +1 (458') +1?5 (344') +57 (4021 +29 (430') +1214471 +5 (454') -2 (461') <br />• +cr-=chargefrant>aseline <br />• WC =insignificant change from t>a5eline a prior to w'Aa well and operabane. <br />• prior =4190, prior to pumping weer well and mining <br />In summary, no significant change in the WL of the Perched aquifer was noted from <br />12A1 <br />°~~, <br />-10 (3zo) <br />31 (476) <br />-12 (461) <br />3 (462) <br />pumpage or mining activity, however a decrease in the WL in 1994 and 1999-2001 was <br />probably a result of extremely low precipitation, with WL increase in wet years. A direct <br />correlation is noted between pumpage and levels reported for the A-Groove. The pumpage <br />effect on the B-Groove is less than the A-Groove, but corresponds with the A-Groove. <br />• 51 <br />