2020-06-16_REVISION - C1981010 (17)

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Page 12 Minor Revision MR-225 will be submitted concurrently with this permit application in order to facilitate the construction of three new groundwater monitor wells into the First, Second and Third White Sandstone aquifers down dip of I and J Pits mining activity. The following revised permit text pages are enclosed and updated as follows: • i-5. Page number changes • i-6. Page number changes • i-13. Page number changes • 2-462o. New section. I/J Pits aquifer characteristics discussion. • 2-520yy to 2-520zz. New section. VJ Pits groundwater quality discussion. • 2-523aa. New section. I/J Pits groundwater levels. • 2-524. Groundwater use discussion updated. • 2-524i. New section. I/J Pits groundwater use discussion. • 3-15 to 3-15a. Update I/J Pits mining sequence narrative. • 3-15b. I/J Pits highwall mining discussion included. • 3-15c. I/J Pits temporary spoil dump discussion included. • 3-44. I/J Pits boxcut discussion included. • 4-4. Discussion of I/J Pits Cropland vs. Range Site C post-mining land use. • 4-226a. Drawdown calculations and discussion added for I and J Pits mining impacts. • 4-226b. Last paragraph on page removed and placed at the top of page 4-226c. Potential impacts to wells from I and J Pits mining added. • 4-226c. Discussion from page 4-226b continued. • 4-226d. Pit by pit discussion of current permit term groundwater inflow reformatted on this page. • 4-226e. I/J pit discussion of groundwater inflow added to this page. Groundwater drawdown predictions also on this page. • 4-226f. Groundwater drawdown predictions, including for I/J Pits, continue on this page. Also, impacts to adjudicated wells is updated to include I/J Pits. • 4-177 (Table 4.8-3). Diversion ditch table updated to reflect future I/J Pits diversion ditches. The following additions to Appendices are enclosed: • Appendix A. Supplemental addendum to bond calculations currently in App A. • Appendix Q. I and J Pits diversion ditch design backup is added to Section XVII. The following revised maps are enclosed: • M6. Sheet 1 of this three set Worst Case Bond revised to include I/J Pits. • M9. Sheet 1 of this three set Haulroads Map is updated. • M10A. Sheet 1 of this three set Mining and Regrade Map is updated. • MIOB. Sheet 1 of this three set Topsoil Stripping and Reclaim Map is updated. • M12. Sheet 1 of this three set Postmining Topography Map is updated. • M14. This Drainage Profiles Map is updated in line with changes to Map M12. • M14A. I/J Pits Pre and post-mining profiles are updated in line with changes to Map M12.