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MINING PLAN <br />Requirement: Another overflow berm will be constructed along [he south end of the large <br />drainage channel that extends along the west side of [he site. This berm shall be an <br />extension of the berm on the east side of the drainage that runs along [he west side of <br />Phase 2. The berm shall connect with the overflow protection berm along [he river. <br />(See Page 24) <br />Requirement: These berms shall remain in place throughout the duration of the operation <br />and until the sealed area is filled with water so as to reduce groundwater barrier wall <br />damage as a result of river overflows causing headward erosion into the pit wall. Once [he <br />sealed portion of the pit is filled with water these berms should no longer be necessary. <br />(No discussion associated with this requirement) <br />Step 2: Installation of the Phase 2 Groundwater Barrier Wall <br />Requirement: Prior to mining the land within the groundwater barrier wall the <br />groundwater barrier wall shall be installed approximately following the path shown on the <br />maps in Exhibit C-3 and C-4C. (See Page 24J <br />Requirement: The groundwater barrier wall shall not enclose the northeastern corner of <br />the Phase 2 area to allow for a smooth outflow of groundwater from 25`" Lane to the river. <br />(See Page 25) <br />STEP 3: Topsoil Salvage and Stockpiling <br />Requirement: Soil over lands to be mined shall be removed prior to mining. Soil will be <br />removed from each area as it is opened for mining rather than over the entire area all at <br />once. (See Page 26) <br />Requirement: Most of the soil removed from Phase 2 will be taken [o Phase 1 for use as <br />topdressing for backfilled areas. Sufficient Phase 2 soil will be retained in Phase 2 for use in <br />topdressing completed pi[ slopes above the expected high water level of a reservoir <br />established after completion of mining. (See Page 26) <br />Requirement: Any topsoil that is stockpiled for more than one season OR is not frequently <br />added to will be seeded. (See Page 27 for discussion and seed mixture to be used.) <br />Pueblo East Pit Amendment 3 (2007) Exhibit D Page 5 of 34 <br />