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MINING PLAN <br />Requirement: The land contained in Phase 1 shall no[ be filled in such a fashion as [o block <br />groundwater from being supplied to wells east of Phase f. Phase 1 shall be backfilled with wash <br />fines, overburden, and other inorganic, clean fill such as solidified concrete. (See Page 16J <br />Requirement: Backfilling of Phase 1 will be done in full consideration of maintaining water <br />flow to the east, as well as backing up some of the flow to the west to help supply 25'" Lane <br />wells, and ultimately produce an environment suitable for establishing a riparian forest over <br />much of the Phase 1 area. (See Page 17) <br />Requirement: A groundwater barrier wall will be installed around Phase 2 as shown an [he <br />maps prior [o mining Phase 2. The only land that may be mined in Phase 2 prior to installing <br />the groundwater barrier wall will be that area in [he northeastern corner of Phase 2 which is <br />outside the area bounded by the groundwater barrier wall. (See Page 17) <br />Requirement: A series of monitoring wells shall be maintained around the perimeter of the <br />operation [o maintain a record of [he impacts of the operation on the adjacent groundwater. <br />(See Page 19) <br />DEWATERING REQUIREMENTS - <br />Requirement: Dewa[ering and sediment control of Phase 1 shall be maintained in accordance <br />with [he basic layout shown in Figure 1 in this exhibit. The actual location and arrangement of <br />sediment basins and piped or pumped flows shall be at the discretion of the operator in <br />accordance with the needs of [he operation so long as the basic layout is followed. (See Page 19J <br />Requirement: All dewatering of the Phase 2 area shall be done via [he initial pit in [he <br />northeastern corner of Phase 2. Discharge from the initial pit may be into Phase 1 or into the <br />adjacent existing channel (see next requirement). (See Page 20) <br />Requirement: If discharge is into the adjacent channel then a series of step dams must be <br />installed in the channel to reduce water velocity and remove sediment prior to its discharge into <br />[he river in accordance with [he standards se[ forth in the NPDES permit. (See Page 20) <br />Pueblo East Pit Amendment 3 (2007} Exhibit D Page 3 of 34 <br />