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REP19056
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Last modified
8/24/2016 11:47:49 PM
Creation date
11/27/2007 2:33:18 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
3/27/1996
Doc Name
1995 AHR (1 of 2)
Annual Report Year
1995
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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Foidel Creek Mine. One surface water site addressed in this report (USGS 09243800) is monitored for flow <br />by the US Geologic Survey (USGS). Prior to the 1989 Water Year, the USGS also collected and analyzed <br />water quality samples from the site. Since the 1989 Water Year, Cyprus collects water quality samples for <br />subsequent analysis by ACZ laboratories. Unless otherwise indicated, all references to "1995" in this report <br />to refer to the 1995 Water Year. <br />BEDROCK GROUNDWATER MONITORING <br />The Wadge Overburden formation (including the Wadge coal seam) overlies the Trout Creek Sandstone and <br />underlies the Twentymile Sandstone. All three geologic units are monitored within the Foidel Creek Mine <br />permit area. <br />Wadge Overburden: During 1995, four Wadge Overburden wells (009-79-4, FBR-11-A, 006-82-74C, and <br />91M006) required monitoring for water levels, field parameters, and water quality parameters on a semi- <br />annual basis. All monitoring requirements were completed at these sites with field measurements obtained <br />and water quality samples collected during May and September Tables 1 through 4 provide summaries of <br />the 1995 Water Year data collected at each site. Throughout the 1995 AHR, data collected in October 1994 <br />is included although these monitoring instances are applicable to the 1994 Water Year. Tables la through <br />• 4a provide period of record statistical summaries of collected data at each site. Figures 3 through 10 provide <br />graphical representations of water levels and selected water quality parameters recorded at each site. <br />The potentiometric surface in the Wadge Overburden is generally observed to slope from south to north in <br />monitored wells. During 1995, water levels were observed to remain fairly static with slight increasing <br />trends indicated in wells FBR-11-A and 006-82-74C. Repairs were completed at well FBR-11-A which <br />allowed more accurate measurement of the pressurized potentiometric surface at this site. The 1995 water <br />levels are noted to be similar to those previously recorded at well 006-88-2 prior to undermining. The <br />previously noted declining trend in well 91M006 appeared to stabilize in 1995. This trend may be related <br />to localized dewatering of the formation as a result of mining activities in the vicinity. Water levels at well <br />009-79-4 remained essentially stable during 1995 with no mining impacts apparent. <br />No anomalous water quality impacts attributable to mining were evident in data collected from Wadge <br />Overburden wells during 1995. However, several monitored parameters at well 009-79-4 were observed <br />to return higher than normal values in May of 1995 (see Table 1). Increased dissolved solids levels are ~p5 qs <br />possibly indicative of impacts associated with spoils water The unusually wet spring experienced in the area 5p~~ <br />may have resulted in the mobilization of these constituents. The data is not indicative of significant changes I ,C' <br />kJ - <br />in trace metals concentrations. By September 1995, monitored parameters exhibited values back within Wit, <br />previously established ranges with the exceptions of field conductivity, total alkalinity, sulfate and SAR ~SI> K~' _ <br />values although these parameters were observed to be declining, Water quality parameters were observed <br />to remain within established ranges at well 006-82-74C with the exception of a slightly elevated SAR values. <br />-2- <br />
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