Laserfiche WebLink
Requirement: Pi[ slopes in Phase 1 will be left in a near vertical condition because Phase 1 <br />will be backtilled. (See Page 31) <br />Requirement: Pit slopes inside the groundwater barrier wall in Phase 2 will be mined to a <br />grade not steeper than 3:1. If a steel wall rather than a slurry wall is installed and fill is <br />available that will not adversely affect the reclamation of Phase 1, then constructing part or <br />all of the elopes with backfill is acceptable. However, under no circumstances may the steel <br />wall itself be exposed directly by mining or through sloughing of the mined face. <br />(See Page 31) <br />Requirement: In the initial mining area of Phase 2 (northeast corner) the south slope <br />adjacent to the groundwater barrier wall will be mined to a grade no[ steeper than 3:1. The <br />other three slopes can be steeper. (See Page 3l) <br />Requirement: Gradual backfilling of the initial mining area in Phase 2 will use a mixture of <br />solidified waste concrete and overburden. (See Page 31) <br />Requirement: Discharge from the initial mining area in Phase 2 will be either into Phase 1 or <br />into the adjacent drainage. If discharge is into the adjacent drainage, appropriate <br />structures to control flow and sediment may be needed to maintain compliance with [he <br />NPDES permit. (See Page 34) <br />Requirement: All discharges from the initial mining area for Phase 2 that do not pass <br />through the sediment control system for Phase 1 must be kept in compliance with the <br />NPDES permit. (No discussion associated with this requirement) <br />Requirement: Mining of the remainder of Phase 2 will generally proceed from west to east <br />and north to south. The southern side of the pit will not be mined within 300 feet of the <br />river until any streambank stabilization actions taken on the current river bank have <br />developed to a point where they can protect the bank from undercutting. (No discussion <br />associated with this requirement) <br />Pueblo East Pit Amendment 3 (2007) Exhibit D Page 7 of 34 <br />