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• caverns. Location of monitoring wells will be approved by EPA <br />and BLM. Monitoring wells established on a boundary between <br />adjacent five-yea:r blocks may be designated for monitoring use <br />for both five-year mining blocks. <br />After evaluation of data from monitoring wells from a five-year <br />block, and with EPA/BLM approval, NaTec will plug and abandon <br />all but one set. All four aquifers at the NaTec-26-EX-2 drill <br />pad will be utilized as a set of permanent monitoring wells to <br />cover the first five-year block of cavities. A set (two wells) <br />containing Dissolution Surface and B-Groove well completions <br />will be maintained as permanent monitoring wells for each five- <br />year block from years 6-30. <br />• <br />NaTec proposes to eventually establish a line of monitor wells <br />located on the northeastern boundary of the well field and <br />monitor ground water of the B-Groove and the interval <br />immediately overlying the Dissolution Surface for the duration <br />of the mining project. Monitor wells that are established as <br />cavities are mined-out will be abandoned as new wells are <br />established to k~aep up the cavity development. Figure 2 <br />portrays an example of how this sequencing will occur for <br />illustrative purposes. Location of well field monitoring wells <br />will be approved by the EPA and BLM. As indicated, the monitor <br />wells located along the transition facies, which forms the <br />• northeastern boundary will be developed as mining proceeds and <br />10 <br />