Laserfiche WebLink
91 M006 remains drawn down to 6600 feet elevation, which is a X00 foot decline from baseline <br />conditions. Although this well is structurally downgradient, a gradient reversal would likely be <br />occurring due to operational pumping of the S~VMD, maintaining a suppressed water level in the <br />Wadge unit. TDS remains at about 900 mg/I, which would also confirm continued movement of <br />water from the undisturbed area toward the mine workings. This well is located 700 feet <br />downgradient of the SWMD. <br />Well 008-77-~8 is east of the EIvID and shows no identifiable change in level or quality. <br />Although the PHC predicts potential dewatering of the Wadge unit out to the recharge mareins <br />of the basin, at this time mining has not caused this to occur. <br />93M001 lies structurally upgradient of the EMD. Approximately 80 feet of decline in water <br />level is apparent in this well since May 1996. Water quality is generally the same or slightly <br />improved, likely due to an increase in velocity caused by downgradient mining, resulting in less <br />resident time in the recharge azea above this well. <br />93M003 also lies structurally upgradient of the EMD. It has declined 200 feet since May 1996 <br />and its quality is variable but generally reflects Wadge groundwater unaffected by mining. <br />However, water quality is improving more recently which may indicate water movement at a <br />higher velocity toward the EMD from the outcrop and recharge zones, resulting in slightly better <br />water quality at the well location, possibly due to less resident time in the formation. <br />Twentvmile sandstone wells <br />Well 006-BRDH7 is completed in the Twentymile sandstone between mined Panel 8 and an un- <br />mined azea of Panel 7. It shows no impact from mining. <br />Well 91 M00~ is completed in Section 20 north of the North Main extension. It shows a 40 foot <br />drop in level, likely due to Panel 8 and Panel 9 mining to the southwest in the EMD. <br />006-82-48A, another Twentymile sandstone well, clearly shows dewatering as mining past by, <br />and under the well. The water quality in the well is basically unchanged. <br />Wells FBR-11B and FBR-2 are 2000 feet and 1000 feet, respectively, from current mining in the <br />EMD. No water level or quality changes are observed. <br />Trout Creek sandstone wells <br />Well 001-83-106 is used by the mine for a mine water supply. Continuous pumping of this well <br />causes a dravvdown of 200 feet from initial readings. <br />Pumping of well OO1-83-106 is the likely cause of the drawdown in well OO1-83-1071ocated <br />5000 feet to the southwest. The timing of the drawdown does not correspond exactly in time but <br />to the continuous pumping of 001-83-106 but the atnount of drawdovvn is similaz in each well. <br />No quality changes in the Trout Creek are apparent. Inflows from the floor of the mine predicted <br />along the faults does not appear to be the cause of the drawdown. <br /> <br />