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Oil wells converted to fresh water wells
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<blockquote data-quote="Allen" data-source="post: 363041" data-attributes="member: 389"><p>I am not aware of any aquifer named after Lake Agassiz, what I am reasonably certain you are referring to is the Dakota Sandstone that daylights out in the Red River Valley. At one point the immense weight of the glaciers in that area reversed flow in the Dakota Sandstone (at least locally) and it freshened up the nearby portion of the Dakota Sandstone. People have nearly wrecked the freshwater areas of the Dakota by installing wells that flowed fresh water, mostly north of Grand Forks. At first they thought it was great, they had an artesian source of fresh water, but over time many of those once fresh and artesian wells either dried up or they turned saline. The State at one point was trying to find some old wells that were abandoned and were just wasting the fresh water, but I'm not sure if there's still an active effort to locate and plug them. </p><p></p><p>BTW, the Dakota Sandstone also exists in western ND where it is quite saline. Enough so that I am not aware of any wells that are used to produce water from it west of the RRV.</p><p></p><p>The recharge area for the Dakota Sandstone is the Black Hills of SD although it is reasonable to believe that in something this large there are other small sources of recharge, probably through the upper and lower confining units.</p></blockquote><p></p>
[QUOTE="Allen, post: 363041, member: 389"] I am not aware of any aquifer named after Lake Agassiz, what I am reasonably certain you are referring to is the Dakota Sandstone that daylights out in the Red River Valley. At one point the immense weight of the glaciers in that area reversed flow in the Dakota Sandstone (at least locally) and it freshened up the nearby portion of the Dakota Sandstone. People have nearly wrecked the freshwater areas of the Dakota by installing wells that flowed fresh water, mostly north of Grand Forks. At first they thought it was great, they had an artesian source of fresh water, but over time many of those once fresh and artesian wells either dried up or they turned saline. The State at one point was trying to find some old wells that were abandoned and were just wasting the fresh water, but I'm not sure if there's still an active effort to locate and plug them. BTW, the Dakota Sandstone also exists in western ND where it is quite saline. Enough so that I am not aware of any wells that are used to produce water from it west of the RRV. The recharge area for the Dakota Sandstone is the Black Hills of SD although it is reasonable to believe that in something this large there are other small sources of recharge, probably through the upper and lower confining units. [/QUOTE]
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