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ENVIRONMENT, INC. <br />NOVEMBER 14, 2014 <br />PAGE 4 <br />13) Please provide an approximate volume of inert material to be backfilled in mining phase 1 <br />and mining phase 2. <br />Estimates for fill to be placed in Phase 1 is 247,000 cyds and in Phase 2 it is estimate that <br />1,553,700 cyds will be placed in the excavated area. Adams County requires an Inert <br />Materials Certificate of Designation (CD) permit for backfilling the Phase 2 area so a CD for <br />the entire permit area will be obtained from the county. A copy of the permit will be provided <br />to the Division upon receipt. <br />14) Please demonstrate how the backfilled site will result in a post- mining configuration that is <br />compatible with the approved post - mining land use. <br />Map Exhibit F shows the area when reclaimed the mined with be reclaimed leaving flat <br />surfaces adjacent to two major streets and an interstate highway. If Option 1 is used, the <br />method of backfilling and the material used would not hamper the use,of the area as pasture. <br />Of Option 2 is used and the site is developed with commercial or industrial uses it will be <br />consistent with surrounding properties. Backfilling with inert maternal will still allow structures <br />to be built on the filled areas but may restrict the types of foundation used on the structures. <br />More information on the filling method is addressed in item 15 below and the methodology <br />described would still make the property usable since the chances for significant settling will <br />be minimal <br />15) Please provide a general engineering plan stating how the material will be placed and <br />stabilized in a manner to avoid unacceptable settling and voids. Please demonstrate that the <br />method used to place the inert fill will support the post- mining land use of <br />commercial/industrial. ( Note: DRMS believes that uncontrolled backfill is not generally <br />compatible with future development that would require properly placed structural fill under <br />utilities and structures. Additionally, with thick sections or large pieces of inert material, issues <br />like soil piping and preferential subsurface drainage patterns can become problems in the future.) <br />In Phase 2 the fill material to be used in defined as "Inert material ", i.e., old concrete, <br />asphalt, dirt, sand and gravel, masonry products and rubble from construction sites. We will <br />not accept anything that does not fit the definition of "Inert material ", i.e., wood, paper or <br />household garbage ( "Solid Waste "). It is not considered structural fill but the filled area will <br />be suitable for building structures that have engineered foundations that take into <br />consideration of the nature of the fill material and site specific conditions. <br />Regular deliveries of inert materials will be delivered to the Site and unloaded on level <br />ground near the area being filled. The inert materials will be placed starting at the base of <br />the lined pit gradually filling to match the existing ground surfaces as shown on the <br />Reclamation Plan Map. Once adequate area at the upper level is 'reached, the material will <br />be placed along the fill slope and pushed in to the hole using heavy equipment. Albert Frei & <br />Sons, Inc. operates 2 other Inert Material Landfills where this method has proved to be <br />successful. The heavy equipment moving over the filled area during the filling process <br />provides adequate compaction on this material. <br />No specific compaction rates are proposed for the fill. The nature of the MI material is such' <br />that much of the material is material from transportation projects containing, dirt, broken <br />concrete and asphalt and large blocks of solid material. This makes it very difficult_ to <br />achieve a specific compaction rate. In most cases the larger materials can be laid on end <br />