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REP37946
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REP37946
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Entry Properties
Last modified
8/25/2016 12:17:24 AM
Creation date
11/27/2007 7:56:03 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
4/1/1999
Doc Name
1998 ANNUAL HYDROLOGY REPORT & LIST OF TABLES
Annual Report Year
1998
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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<br />higher bicarbonate, carbonate, and total alkalinity concentrations. At well FBR-1 I-B (Table 10), new minimum <br />values were recorded for lab conductivity, lab pH, dissolved solids, and carbonate; new maximum values were <br />recorded for lab conductivity, alkalinity, bicarbonate, dissolved cadmium, dissolved iron, and dissolved <br />manganese. At well FBR-2 (Table 11), new minimum values were recorded for conductivity, alkalinity, <br />hardness, dissolved calcium, and dissolved magnesium; new maximum values were recorded for dissolved <br />sodium, SAR, and dissolved lead. <br />Trout Creek Sandstone: During 1998, four Trout Creek Sandstone wells (001-83-106, 001-83-107, FCM#2, and <br />FBR-2-E) required monitoring for water levels and field parameters on asemi-annual basis. An additional well <br />(008-75-EFC) required an annual water level measurement. Wells 001-83-106, FCM#2, and FBR-2-E also <br />required water quality sampling on asemi-annual basis. Well FCM#2 was replaced in the fall of 1995 by <br />monitoring well 95M001. Semi-annual monitoring during 1998 occurred at well 95M001 in lieu of FCM#2. <br />Field parameters at well 001-83-107 were not obtained during 1998 as this well had formerly been pressurized <br />and was constructed to remain sealed. Pressures during 1997 were reduced to the point that artesian flow from <br />[he well ceased. Though water level measurements were obtained, no opening large enough for a bailer was <br />available to extract water for field parameter measurements. In December, 1997, the well was modified to <br />provide access for a bailer and field parameter measurements were obtained. An elevated pH was noted at this <br />time (9.76) with conductivity and temperature readings normal. Tables 12 through 16 provide summaries of the <br />1998 Water Year data collected at each site. Table 12a provides the period of record statistical summary of <br />. collected data at well 001-83-106 with Tables 15a and 16a providing the period of record statistical summaries of <br />collected data at wells 95M001 and FBR-2-E. Figures 25 through 31 provide graphical representations of water <br />levels and selected water quality parameters recorded at each site. <br />The continuous pumping of well 001-83-106 (Figure 25) complicates the potentiometric surface in the Trout <br />Creek Sandstone. The potentiometric surface trends prevalent in the Twentymile Sandstone and Wadge <br />Overburden aquifers are not evident in the monitored Trout Creek wells. The previously monitored well 006-83- <br />48C routinely exhibited water levels in [he 7100 ft elevation range while replacement well FCM#2 returned levels <br />around elevation 6520 during 1995. In the fall of 1995, well 95M001 was established in part to address the <br />apparent discrepancy in water levels between wells 006-83-48C and FCM#2. Water levels returned from well <br />95M001 confirm that levels recorded from well FCM#2 were accurate (Figure 27). Inflows from the Trout Creek <br />Sandstone into the mine workings have not been encountered to date to account for the apparent lowering of the <br />poten[iometric surface in the Trout Creek formation as indicated by the water level data previously recorded for <br />well 006-83-48C. Some dewatering of the aquifer does occur from the pumping of well 001-83-106 to supply the <br />mine with domestic water. During 199, [he southernmost Trout Creek well (001-83-107 -Figure 26) continued [o <br />exhibited lower water levels in the 6860 ft elevation range while the northernmost well (008-75-EFC -Figure 28) <br />remained around the 6620 R elevation level. Well FBR-2-E (Figure 30) returned levels around 6730 ft elevation <br />during 1998. With [he exception of well 001-83-107, water levels in the Trout Creek were observed to be <br />consistent with recently obtained measurements. Well 001-83-107 continued to show lower water levels than <br />-4- <br />
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