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Requirement: The land contained in Phase 1 shall not be filled in such a fashion as to block <br />groundwater from being supplied to wells east of Phase 1. Phase 1 shall be backfilled with wash <br />Tines, overburden, and other inorganic, clean fill such as solidified concrete. (See Page 16) <br />Requirement: Backfilling of Phase f will be done in full consideration of maintaining water <br />flow to the east, as well as backing up some of [he flow to the west [o 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 on the <br />maps prior to mining Phase 2. The only land that may be mined in Phase 2 prior [o installing <br />the groundwater barrier wall will be that area in the northeastern corner of Phase 2 which is <br />outside [he area bounded by the groundwater barrier wall. (See Page / 7) <br />Requirement: A series of monitoring wells shall be maintained around the perimeter of [he <br />operation to maintain a record of the 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 the 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 [he operator in <br />accordance with the needs of the operation so long as the basic layout is followed. (See Page 19) <br />Requirement: All dewatering of the Phase 2 area shall be done via the initial pit in the <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 />the river in accordance with the standards set forth in the NPDES permit. (See Page 20) <br />Pueblo East Pit Amendment 3 (2007) Exhibit D Page 3 of 34 <br />