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Stage 1 -will establish the Aggregate Plant,the Siltation Pond,the Freshwater Pond,and will <br /> mine out the future commercial area in the south-west corner of the site.These areas, <br /> excluding the Aggregate Plant,will be wet mined with excavators. Stage 1 is expected to last <br /> approximately 2 years. <br /> Topsoil mined from phase one will be segregated and utilized to establish a berm along the <br /> north-western boundary of the site along Weld County Road 44 and Colorado State Highway <br /> 66.After the berm has been established the remaining segregated topsoil will be stockpiled in <br /> the northern portion of Cell 7. <br /> Overburden,clay and any other material that is uneconomical to sell will be stockpiled in the <br /> northern portion of Cell 7 to be used in Stage 2 slope reclamation. <br /> Stage 2-will consist of mining out Cell 3 in the north-east corner of the site. Mining will be <br /> completed in three(3)year long phases and will progress from west to east. Cell 3 will be a <br /> slurry wall lined cell and will be dry mined. The Infiltration Pond north of Cell 7 will be mined <br /> out concurrent with Cell 3. The Infiltration Pond will be mined to approximately 10 to 15 feet <br /> deep and will not encounter the water table. If the groundwater is encountered the area of the <br /> pit below the groundwater table will be filled with aggregate to approximately two(2)feet <br /> above the elevation where groundwater was encountered. <br /> Topsoil from this stage will be segregated and stockpiled in the northern portion of Cell 7. <br /> In the initial phase,overburden will be stockpiled existing stockpile in Cell 7. Once the first <br /> phase has been completely mined out, reclamation will begin on that phase and overburden <br /> material from the other phases will be placed directly in the reclamation slopes or sold. <br /> Stage 3—will consist of mining out Cell 4 and concurrently reclaiming Cell 3. Cell 4 contains <br /> three(3)approximately one (1)year phases. Cell 4 will be a slurry wall lined cell and will be <br /> dry mined. Concurrent with Cell 4 slurry wall construction the southeast underdrain or series <br /> of dewatering wells will be constructed south of Cell 5S. Water from this area will be rerouted <br /> to the infiltration pond excavated in Stage 2 to mitigate the drop in groundwater elevation north <br /> of the site due to slurry wall construction. <br /> Topsoil from this stage will be segregate and stockpiled in the northern portion of Cell 7 as <br /> indicated on the map. <br /> Slope reclamation of the previous phases will be concurrent with mining. Overburden will be <br /> placed in the reclamation slope or stockpiled in the bottom of the pit next to the current <br /> reclamation phase. Excess overburden will be placed in the southwest corner of Cell 6 to fill in <br /> the future commercial area. <br /> Stage 4—will consist of mining out Cell 5 and concurrently reclaiming Cell 4. Cell 5 contains <br /> seven (7)approximately one(1)year phases. Cell 5 will be a slurry wall lined cell and will be <br /> dry mined. <br /> Topsoil from this stage will be segregate and stockpiled in the northern portion of Cell 7 as <br /> indicated on the map. <br /> Section 20—Gravel Mine—MLRB 112 Permit Amendment <br /> Exhibit D-2 <br />