Laserfiche WebLink
• No anomalous water quality impacts attributable to mining were evident in data collected from Wadge <br />Overburden wells during 1998. A New minimum value for lab pH was recorded in May, and a new minimum lab <br />conductivity was recorded in September at well 009-79-4 (Table 1). At Well FBR-II-A (Table 2), new <br />maximum values for sodium and SAR were recorded in April, then a new minimum value for lab pH and a new <br />maximum value for iron were recorded in September. AT Well 006-82-74C, several new maximum values were <br />recorded. These included values for dissolved calcium and dissolved molybdenum in May, then values for field <br />pH, lab pH, dissolved sodium and SAR in September. At well 91M006 (Table 4) elevated pH values continued <br />to remain evident during 1998. New minimum values were recorded during the year for field conductivity, lab <br />conductivity, dissolved solids, hardness, dissolved calcium, dissolved magnesium, and bicarbonate. New <br />maximum values was noted far field pH, lab pH, dissolved sodium. SAR, carbonate, and dissolved molybdenum. <br />At well 93M001 (Table 6), new minimum values were recorded for field conductivity, lab conductivity, lab pH, <br />dissolved solids, and dissolved iron; new maximum values were recorded for bicarbonate, nitrite, and ortho-diss <br />phosphate. At well 93M003 (Table 7), new minimum values were recorded for dissolved solids, hardness, <br />dissolved magnesium, sulfate and bicarbonate; new maximum values were recorded for conductivity, pH, SAR, <br />hydroxide, dissolved manganese, nitrite, and ortho-diss phosphate. The data is not indicative of significant <br />changes in trace metals concentrations. <br />Twentymile Sandstone: During 1998, two Twentymile Sandstone wells (006-BRDH-7 and 91M005) required <br />• monitoring for water levels and field parameters on asemi-annual basis. Two additional Twentymile Sandstone <br />wells, FBR-II-B, and FBR-2) required monitoring for water levels, field parameters, and water quality <br />parameters on asemi-annual basis. All monitoring requirements were completed at these sites during 1998 with <br />field measurements obtained and water quality samples collected during April and September. Tables 8, 9, 10, <br />and 1 I provide summaries of the 1998 Water Year data collected at each site. Figures 17 through 24 provide <br />graphical representations of water levels and selected water quality parameters recorded at each site. <br />The potentiometric surface in the Twentymile Sandstone as reflected by these four wells is generally observed to <br />slope from south to north. Water levels during 1998 were observed as follows. Wells 006-BRDH-7 (Figure 17). <br />91M005 (Figure 19), FBR-l l-B (Figure 2l), and FBR-2 (Figure 23) remained steady throughout the yeaz with no <br />mine impacts apparent. The lower water levels typical in well 91 M005 relative to well 006-82-48A continued to <br />remain apparent. Well 91M005 was established in 1993 to replace well 006-82-48A which was mined through <br />during 1993. <br />Field measurements are presented in Tables 8 and 9 for wells 006-BRDH-7 and 91M005. Field parameter <br />measurements on these Twentymile Sandstone wells monitored during 1998 returned values within anticipated <br />ranges with no mine related impacts evident. Field measurements and water quality parameters for wells FBR- <br />I I-B and FBR-2 are provided on Tables 10 and I 1 respectively. These wells show slightly different water quality <br />• characteristics with higher calcium, magnesium, and sodium concentrations noted in well FBR-2 along with <br />-3- <br />