I agree with AJ, that is a weird report. The sodium is astronomic and not suitable for potable water. Anything over 250 ppm sodium would have a plainly apparent salty taste, so something is up. I have heard that there are places in Michigan that have very salty groundwater. I wouldn't brew with it. My hat's off to Pat if he can make it work!
Oh, and to produce the bicarbonate and carbonate numbers that Ward reported, the pH would have to be a little above 9.1.
Oh, and to produce the bicarbonate and carbonate numbers that Ward reported, the pH would have to be a little above 9.1.