2004-01-14_REVISION - M1980183 - Laserfiche WebLink

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. EXHIBIT D -MINING PLAN Brannan Sand and Gravel Company will continue to operate the mining of Pit No. 29 on Pazcels A and B as permitted in the original permit application. This amended application is to change the current operation from a dragline excavation under water to a dry excavation with loaders and/or scrapers and to enlazge the operation to include Pazcels C and D. In order to change the mine from a wet to dry operation, the amended mine plan is to install slurry walls around Pazcels A, B, C, and D, dewater the pit, and continue mining by dry excavation. The layout of the slurry walls and site phasing and operation scheme is shown on the Mining Plan, Figure C-4. As discussed in the original permit application the dry earthmoving operations, surface water management and commodities mined will be similar. Overburden materials will be removed by scrapers and stockpiled for use during reclamation. Surface water runoff will not be diverted but intercepted by the pits where it will percolate, evaporate or be pumped out with the dewatering operations. Dewatering is discussed further in Exhibit G. The commodities to be mined are gravels and sand for construction use as concrete and asphalt aggregates. A general outline of the mining operation is discussed below followed by a Timetable of Events that outlines the sequence of events, the operation to occur and the time periods for each phase. • Initially, wet mining of Pazcel A will continue with some excavated material from Pazcel A stockpiled on Parcel B for use during reclamation. During the final stages of mining in Pazcel A, slurry walls azound the perimeter will be constructed along with acut-across slurry wall between Pazcel A and B and possibly a second cut-across slurry wall between parcels A and D. This will create two or three cells for use as reservoirs. The order of operations is as follows: • Construct slurry wall azound perimeter with cut-across wall, or walls. • Dewater Area I and pump water into Area II. • Dry mine Area I with 2:I slopes. • -Stockpile and process material from Area I on Area II land. • Complete mining Area I and reclaim slopes at 3:1. • Reclaim slopes as shown on Figure F-2. • Pump water from Area II into Area I, thereby dewatering Area II. • Dry mine Area II, with or without Area III with 2:1 slopes. • Complete mining Areas II and III and reclaim slopes at 3:1. • Optionally, Area III may be a separate cell. This will require acut-across wall between Areas II and III. The mining of Area III will follow the completion of Area II in this event. • All slopes will be reclaimed as shown on Figure F-2. Brannan Sand & Gravel Mining Application August 2003 X:\1440000.a11\1445701\WordUtepom\Pe~mit Amedmem-12-I1-03.doe