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<br />-z- <br />Rule 2.05.4{'l)(c) - Backfilliny and Grading <br />The applicant comments, on page IV-5 of the amended application document, <br />that auger mining pits No. 6, No. 7 and No. 8 will be backfilled in a <br />configuration which varies from the pre-mining topography. Schematic <br />cross-sections of atypical auger area are presented in Figure 1 of <br />Section 2.06.9, page V-16 of the amended application. The applicant <br />should include this cross-reference within the text of Rule 2.05.4. In <br />addition, the applicant should expand the rather vague and ambiguous <br />statement concerning final topography of the augered pit areas. The <br />applicant should specifically discuss why the configuration proposed in <br />Figure 1 of Section 2.06.9 constitutes the reconstruction of approximate <br />original contour. <br />Rule 2.05.4(2)(y) - Sealing Openinys and Drilled Holes <br />The applicant proposes to seal drilled holes by returning the drill <br />cuttings to the bore hole. Rules 4.07.3(1) and ("2) require the placement <br />of an appropriate mechanical plug and concrete poured column near the <br />surface of each bored hole. The applicant should amend the application <br />document appropriately. <br />Rule 2.06.9 - Special Categories of I+lining - Auger t4ininy <br />In general, the augering scheme appears acceptable. However, a few items <br />require additional description within the amended application document. <br />Neither the text of this section nor the schematic Figure No 1 on page <br />V-lti, mentioned the salvaging the topsoil prior to mining. The <br />application should be appropriately amended. The question regarding <br />backfilling of the augered areas to achieve approximate original contour <br />must be resolved, as discussed under Rule 2.05.4(2)(c) above. Further, <br />the applicant's observation that augering down-dip will preclude drainage <br />from the augered bore holes is insufficient. The applicant should expand <br />this discussion to demonstrate that the hydrologic heads encountered will <br />not be sufficient to cause ground water flow from the bore openings. <br />/ant <br />Doc. No. 1766 <br />