REP20277 - Laserfiche WebLink

Home Browse Search

. Field conductivity measurements in general at well 001-5-5 (average of 2185 in 2002) were again noted to be higher than the upgradient site 009-5-10 (average of 1259 in 2002). Moving downgradient, field conductivities at wells FO-4 and FO-1 averaged 2518 and 2932 respectively for 2002. Further downgradient, field conductivities a[ well 008-AV-2 are averaging 1688. Conductivity values at well 009-S-10 fluctuated within previously established ranges during 2002. The generally increasing field conductivity trend, noted in previous yeazs for well 001-S-5, appears to have stabilized, beginning in 2000 and continuing through 2002. Field conductivity measurements at wells 008-AV-1 and 008-AV-2 are 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 upward trend. TCC will continue to monitor the direction of this trend. No new maximum or minimum values were recorded at we11009-S-10 (Table 24). At we11001-S-5 (Table 25) a new maximum value for laboratory ph was recorded, and a new maximum value for dissolved calcium and sulfate were recorded. At well 008-AV-2 (Table 26) a new maximum value for dissolved calcium was recorded. At well FO-1 (Table 28) new minimum values were recorded for dissolved calcium, dissolved magnesium, and dissolved sodium. A new maximum value was also recorded for nitrate. At well FO-4 (Table 29) new minimum values were recorded for dissolved calcium, dissolved magnesium, and dissolved sodium. Wells FO-1 and FOB exhibit field conductivities notably higher than alluvial wells upstream and downstream of these sites. Well FO-1 is characterized with calcium and sulfate as the dominant cation and anion respectively. Well FO-4 exhibits sodium and sulfate as the dominant ions. • Fish Creek Alluvial Groundwater: During 2002 five Fish Creek alluvial wells (006-AY-1, 006-AZ-3, 006- AW-2, 008-AU-3 and 008-AW-3) required monitoring for water levels and field parameters on a monthly basis, and water quality sampling on a quarterly basis. All sampling requirements were met. Tables 30 through 34 provide summaries of the 2002 Water Yeaz data collected at each site. Tables 30a through 34a provide period of record statistical summaries of collected data at each site. Figures 56 through 65 provide graphical representations of water levels and selected water quality pazameters recorded at each site. Two new alluvial wells (AVF-13 and AVF-14) were installed in August 2001. An additional new alluvial well was installed in June 2002 (AVF-IS). These wells require monitoring for water levels and field parameters on a quarterly basis, and water quality sampling on asemi-annual basis. Localized mining subsidence along Fish Creek, combined with drought conditions, allowed only one round of water quality sampling from wells AVF-14 and AVF-15 during 2002, before they went dry in July 2002. Data for sites AVF-13, AVF-14, and AVF-15 are provided in Tables 75, 76, and 77, respectively. Figures 138 through 140 provide graphical representations of water levels and selected water quality parameters recorded at each site. Due to the limited period in which these wells have been established, the data base will need to be expanded before maximum and minimum values can be evaluated. None of the values recorded during the initial sampling episode fell outside the typical historical range of other wells in this aquifer. • Water levels at well 006-AY-1, located on Fish Creek upstream of the Southwest Mining District and Mine 2, had exhibited a relatively steady increase from approximately 1990 through 1994 (see Figure 56). From 1994 8