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M-2001-001 Line Camp Pit Amendment#2 (Expansion) <br /> b. Limit slope of pit to 2H:1V or immediately (same day) replace excavated material <br /> with backfill material and compact to 2H:1V slope. <br /> c. Do not strip or excavate during high-water events on the river. <br /> d. Cease operations if there is any immediate flow of water observed in the <br /> exposed soil or materials, and evaluate impacts and potential effects. <br /> e. Provide "gates" in stockpiled soil (berms) along riverside edge of pit of <br /> undisturbed soil (and vegetation) and protect berm toes with riprap or silt fencing. <br /> f. Construct "gates" every 200 feet, floor with 2% inverse crown, 6 feet wide and full <br /> depth of berm, 2H:1V sideslopes. Install silt fence at toe of sides and facing river <br /> (min 6 feet on each side of opening). <br /> g. Refer to Exhibit C (Mining Plan) and SWMP for procedures. <br /> 4. Groundwater <br /> a. Use water from Home Ditch to maintain pond levels as shown in Map F-2 table and Map F-3 <br /> b. As dewatering will be rarely done and for limited periods of time, while known water wells <br /> obtaining water from the alluvial aquifer are 1,500 or more feet from the ponds/excavations <br /> being dewatered, there continues to be no anticipated impact or significant drawdown on <br /> water wells located to the north and south of the operation. (As determined as part of the <br /> initial application package.) <br /> c. Due to the alluvium and relatively short lag times between the river and the ponds, the water <br /> level in the ponds will generally be within one to two feet vertically of river water levels. Thus <br /> there will not be a drawdown of alluvial or other groundwater. <br /> d. Pond surfaces can be observed on a daily basis (when operations are on-going) and any <br /> contamination of the water by oil and grease can be noted and dealt with before water levels <br /> allow such contaminants to enter ground or surface water. Procedures are included in <br /> surface water management plan (SWMP) and operating instructions. <br /> e. As determined by water court decree, the Home Ditch, through temporary and permanent <br /> dry-up of irrigated lands now being mined, provides adequate water during irrigation season, <br /> shoulder months, and during periods of frozen water surfaces (winter), to make up water lost <br /> to evaporation and in product processing and shipping. These consumptive uses therefore <br /> do not impact negatively on groundwater. <br /> 5182-22-001 VVASTELINE, INC, Page 41 of 65 <br />