REP24903 - Laserfiche WebLink

Home Browse Search

. these deposits indicate that they aze usually Tess than 20 feet thick and the depth to Bound water is typically less than 10 feet. The limited extent of the Foidel Creek alluvial deposits, and the lack of base flow in the creek indicates that these deposits aze relatively insignificant to the area Bound water hydrologic system. Alluvial deposits wntaining goundwater aze monitored in the Foidel Creek, Fish Creek, Trout Creek and Middle Creek drainages. In the Foidel Creek drainage, sites both upstream and downstream of the TCC portals and support facilities aze monitored. In the Fish Creek Drainage, sites upstream and downstream of the Mine 2 area and the Fish Creek Borehole mine dewatering facilities aze monitored. Foidel Creek Alluvial Groundwater: Duriug 2001, five Foidel Crcek alluvial wells, 009-5-10, 001-5-5, 008- AV-2, FO-1, and FO-4, required monitoring for water levels and field pazameters on a monthly basis, and water quality sampling on a quarterly basis. An additional well, 008-AV-1 required monthly monitoring only for water levels and field parameters. All monitoring requirements were met at these sites. Tables 24 through 29 provide summaries of the 2001 Water Yeaz data collected at each site. Tables 24a through 29a provide period of record statistical summaries of collected data at each site. Figures 43 through 55 provide graphical representations of water levels and selected water quality parameters recorded at each site. Water levels during 2001 remained generally consistent with established ranges and patterns and showed the typical seasonal variability of elevated water levels in the spring. Well 009-S-10 provides data for the alluvial aquifer upgradient from the mine portals. Well 001-5-5 is located just downgradient form the mine portals and • surface facilities location and is monitored in conjunction with surface water monitoring site 8. Figure 47 is indicative of the general relationship between the alluvial goundwater elevations and surface water elevations at these two sites. Site 8 exhibited an historic drop in water levels for 2001, going from about 6792 ft at the end of 2000 to about 6789 ft in 2001. Wells 008-AV-1 and 008-AV-2 are monitored in conjunction with surface water site 304 at a point on Foidel Creek approximately 1000 feet upstream of the confluence of Foidel and Middle Creeks. Water levels in these wells and the stream show the typical seasonal interrelationship of relatively rapid increases and declines associated with spring nmoff (Figure 48). The longer-term trends in water levels at these sites generally parallel the fluctuations observed in annual stream flows. Wells FO-1 and FO-4 are situated on Foidel Creek approximately overlying the gateroads between the second and third panels mined in the EMD. Typical seasonal fluctuations in water levels are depicted at these sites on figures 52 and 54. Field conductivity measurements in general at wed 001-5-5 (average of 2223 in 2001) were again noted to be higher than the upgradient site 009-5-10 (average of 1194 in 2001). Moving downgadient, field conductivities at wells FOB and FO-1 averaged 2778 and 2742 respectively for 2001. Further downgradient, field wnduc$vities at well 008-AV-2 are averaging 1707. Conductivity values at well 009-5-10 fluctuated within previously established ranges during 2000. The generally increasing field conductivity (rend, noted in previous years for well 001-5-5, appears to be continuing in the 2001 data. Field conductivity measurements at wells 008-AV-1 and 008-AV-2 aze comparable and occurred within previously established ranges for these sites. As indicated on Figure 51, TDS concentrations at well 008-AV-2 continued a gentle upwazd trend. TCC will continue to monitor . the direction of this trend.