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• change in rock type from primarily silty sandstones to <br />marlstones which are deltaic tongues of the Green River <br />Formation that :interfinger with the Uinta Formation. The <br />Perched aquifer is not continuous over the NaTec sodium lease <br />tract. Water production from the Perched aquifer in the lease <br />area has been mea:>ured to be less than 10 GPM. <br />As a result of water quality and piezometric data, NaTec has <br />identified four zones within the original upper and lower <br />aquifer concept which merit monitoring. Figure 2 illustrates <br />Dissolution Surface, B-Groove, A-Groove and Perched aquifers <br />which will be monitored. <br />• 1.1 Dedicated Monitor Wells <br />The location of the dedicated up- and down-gradient monitoring <br />wells are shown on map in Plate 1. As shown, four wells (IRI-1, <br />NaTec-26-2, 3 and 4) were recompleted to the southwestern side <br />of the well field. These wells are up-hydraulic gradient from <br />the well field. Immediately down-gradient, four wells (NaTec- <br />26-EX-2, NaTec-26-89-1, 2 and 3) were completed immediately <br />northeast of the well field and will be utilized as long-term <br />well ie d and dedicated monitoring wells. In addition, five <br />wells (IRI-4, 5, 6, 7, and 8) will be completed to the northeast <br />and down-hydraulic gradient from the well field at the former <br />• (maxi-padj aquifer test site. Consequently, four ground water <br />zones (the 20 fool: interval overlying the Dissolution Surface, <br />6 <br />