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A~(anh 2006 Pit BarkfillS'tabifiry * IIIG' <br />(115.6 pcf) to 2.36 (94.2 pcf). 'Phe unit weight of the material has only a rnirumal effect on the <br />• stability. <br />The stability analysis has shown that the depth of the phreatic surface is the controlling parameter in <br />the model When the postmining topographic model, using the Wadge Coal over/underburden <br />phreatic surfaces, is compared with conceptual models with varying scope heights, the phreatic surface <br />does not reach an elevation required to reduce the F.S. to 1.30. The present postmirting topography <br />being constructed for the IIW Mine pit backfill is therefore acceptable under anticipated groundwater <br />conditions. <br />• <br />• <br />MWH * 1475 Pine Grove RaaA, Suite 109 * Steamboat Spnngg CO 80dR7 <br />u-u vn.w.,i an'iru e~taa,ma~n/au a., ]r..o <br />+/:xioa <br />