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<br /> <br />(b) The approximate volume of inert material to be backfilled. <br />The volume of material placed will typically be about 5 cubic yards per month. <br />(c) A signed affidavit certifying that the material is clean and inert. <br />An affidavit is attached. <br />(d) The approximate dates the proposed activity will commence and end. <br />Use of inert concrete rubble as backfill material began around 1998. It is expected <br />to end with the r..ompletion of mining at this site. Gravel extraction is expected to <br />be completed in 2003. <br />(e) An explanation of how the backfilled site will result in apost-mining <br />configuration [hat is compatible with the post-mining landuse. <br />The post-mining land uses for the site are 28 acres restored for industrial or <br />commercial land and the remainder of the site restored as a lake. The presence of <br />the rubble material on the pi[ floor has no effect on the configuration or stability <br />of the final land surface or final pit side slopes. In the area that will be industrial <br />land, concrete rubble was not placed on the pit floor or incorporated in the <br />backfill in any way. The area located at the perimeter slope at the south side of the <br />lake will not suffer stability problems due to the rubble backfill. Rubble located in <br />these final slopes will never be a very large volume of material. The soil cover <br />will be sufficient to embed the rubble in a stable slope. <br />(~ A general engineering plan stating how the material will be placed and stabilized <br />in a manner to avoid unacceptable settling and voids. <br />Rubble is placed at the floor of the pi[ prior to backfilling over the rubble with soil <br />material. As a slope area is backfilled with soil material to achieve the final <br />configuration, a D8 bulldozer shapes the material through multiple passes at a <br />particular location. The multiple passes that the dozer makes at any particular <br />location compacts the fill sufficiently to create a stable slope area. The rubble <br />pieces are distributed at the bottom of this fill volume. The rubble volume is a <br />small fraction of the total backfill volume. Compaction of the soil is sufficient to <br />stabilize the fill. <br />Sincere) , <br />K•~~nw~ C~ ~eU---~~ <br />Richard Johnson <br />Resource Manager <br />