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2.7.5.2b Ground Water Quality, Eastern Expansion Area <br />Trapper submitted PR -07 in May of 2013 with the intent to extend the perimeter boundary of the mine <br />to the Knez Divide road, otherwise known as Moffat County Road 33. This small permit extension <br />adjoins the active mine area and permit boundary as of 2013. The relevant geologic units in this <br />expansion are present minewide. Sections 2.7.5.2 and 2.7.5.2a both contain relevant information to the <br />area, particularly section 2.7.5.2a. <br />Further data collection will be ongoing in the area mentioned above. Three proposed wells will be <br />completed in the northern end of the expansion area. These wells will target any possible alluvium <br />aquifer, the Hl aquifer and the QR aquifer. <br />Current water quality for the eastern portion of the mine is represented in Table 2.7 -22aa depicting the <br />water quality data to date for relevant wells in the eastern portion of the mine. Wells such as GP -7 and <br />GP -8 are located adjacent to the PR -07 expansion area. They have been minimally impacted by mining <br />to their west and display steady water quality parameters. Water quality data from these wells is an <br />accurate representation of the expansion area for the HI and KLM intervals. <br />The TD5 concentrations in the ground water of the eastern half of the mine has shown very limited <br />impacts as mining has progressed across the existing permit area. Small increases noted in wells such as <br />GC -1, 2 and 3 may correlate to the passing of Ashmore pit in this area. Otherwise, the long term trends <br />as presented in Figures 2.7 -28u, 28v, 28w and 28x show very little change beyond natural variability <br />within the eastern aquifers of the mine site. Of particular interest are the correlations of the GC series <br />wells and GP -7, 8 and 9. The GP wells have remained relatively isolated from mining and exhibit similar <br />trends to the GC wells that were nearer active mining. <br />Water quality within the eastern expansion area is expected to mirror the water quality found in the <br />above mentioned wells in the existing eastern portion of the mine permit. Wells GP -7 and GP -8 sit on <br />the easternmost edge of the property and adjoin the expansion area. Water quality at these wells <br />should demonstrate the characteristics of the aquifer immediately east of them. Figures 2.7 -28w and <br />2.7 -28x show steady trends of TDS for these wells and their counterparts further west. it is assumed <br />that the other water quality parameters will follow the steady trend depicted by the TD5. The water <br />quality of the potentially impacted aquifers should closely follow the trends seen in the wells of the <br />eastern portion of the existing permit area. <br />Once further baseline water quality data is obtained in the expansion area, an analysis of this data will <br />be conducted and presented in this section comparing the new wells and relevant existing wells in the <br />eastern portion of the mine area. Very little variation is expected with the area after analysis of the long <br />term trends seen in the existing eastern wells. <br />Revision: PR - 0 ? <br />2 -520ww <br />Approved: <br />