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valved pipes were installed in the portal seal to control the seepage and route it to several <br />treatment ponds via a French drain. The seepage water entering the treatment ponds was <br />treated with sodium hydroxide in order to increase the pH and allow the iron to precipitate <br />before the water discharged to the creek. The treatment system was later modified to increase <br />the residence time of the seepage water in the treatment ponds. This was accomplished by <br />elongating the treatment ponds to increase their volume. The longer residence time resulted in <br />the iron precipitating out of the water, to below the NPDES effluent limits, without the sodium <br />hydroxide treatment. <br />A plan for backfilling the entrance was approved with Technical Revision No. 20 on October <br />1, 1998. The Division's inspection of October 26, 1998 confirmed that the Mine No. 1 main <br />adit and ventilation shaft adit were backfilled, graded and topsoiled. <br />The final reclamation of the loadout area included grading and backfilling the disturbed areas. <br />The area was returned to its approximate original contours and restored to support agricultural <br />production. The loadout area reclamation was completed in 1987. <br />The main portion of the loadout was located north and east of the Roaring Fork River on land <br />known as the Diamond A parcel. The Diamond A Parcel was removed from the permit by the <br />DMG's approval of TR-15 on February 1, 1994. <br />s <br />