Laserfiche WebLink
• <br />Allen Sorenson: <br />That was another question I wanted to ask. In terms of locating, now you're talking about A- <br />Groove monitoring wells. How well are the gradients understood at your lease? I mean from <br />the existing lease. Is the idea to get these located downgradient in your well field optimally <br />located. <br />Roger Day: <br />I believe that the groundwater flow is such that your best optimum is right dead center of <br />your potential impact. Because if you don't and you're impact is over here and your sitting <br />down here forever, waiting to see it. <br />Allen Sorenson: <br />You'll have your monitoring wells right in the hole? <br />Roger Day: <br />Dead center, right in the field. It bisects it. Then we've got those TH -75 -7A and 7B wells <br />and if there were something that surprised us and got around this thing, this is a backup <br />system. <br />Ned Banta: <br />I have some concerns about that. First of all, they're pretty far away and we're talking about <br />years for any solute getting down there. Because it is so far away, you also have to be <br />concerned about whether it's really downgradient. They're generally downgradient, but <br />whether a plume would actually intersect either one of those wells is another question. And <br />the fact that they're open over such a large interval, that'd be masking a plume that happens <br />to follow a fairly permeable zone, maybe it'd make up a small amount. So, I might ask about <br />the real usefulness of those. <br />Jerry Daub: <br />Keep in mind that those wells could be recompleted if we wanted to recomplete them and put <br />them in useful operation. The other thing is, we're not talking about a cyanide heap leaching <br />operation here where we'd end up having hazardous waste. We're talking about the <br />solubility of sodium bicarbonate. You chew it in your gum, you brush your teeth with it, it's <br />.in the water, it's being naturally dissolved now. So .that's something to consider also when <br />-.you're monitoring —what we're dealing with. We're not leaching copper as is done in <br />Arizona. We're not using hazardous material. To answer your question, a regional <br />perspective of the groundwater flow is to the northeast. And you said it's far away. The well <br />field in the area of review that we just did for the UIC permit application, the center of the <br />well field is about 1,000 ft from USGS TH -75 -A and 7B. So, it's not all that far away. <br />Ned Banta: <br />I was assuming it was almost twice that far. I'm kind of confused then. I went through my <br />little calculations. I was using this side as the center of your well field. (Jerry Daub and <br />Roger Day guided Ned to the correct center of the well field). <br />END OF TAPE 2 SIDE A <br />23 <br />