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REP40945
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REP40945
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Entry Properties
Last modified
8/25/2016 12:42:50 AM
Creation date
11/27/2007 8:53:10 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981012
IBM Index Class Name
Report
Doc Date
4/17/2007
Doc Name
2005/2006 AHR Review Letter
From
DRMs
To
Peak Project Management
Annual Report Year
2005
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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Excursions from the required monitoring frequency were noted in 2006 as follows <br />• Both required water level measurements were missed in NEW-3 <br />• The annual water sample for both NEW-2 and NEW-4 were not reported. <br />Analysis of Data arnd Determination of Imaacts <br />Surface Water Quantity and Quality <br />Two stations on the Purgatoire River are monitored for flow and field parameters on a <br />semi-annual basis, and water quality on an annual basis. PRS-1 is located upstream of <br />all New Elk mining activities and PRS-4 is located downstream of all mining activities, <br />yet upstream of the confluence of the North Fork of the Purgatoire with the Middle Fork. <br />The measured value of TDS at the downstream site, PRS-4 is 30 mg/I higher than the <br />upstream site, PRS-'I (180 mg/I vs. 150 mg/I respectively) and is likely due to pre-law <br />mining activities along this stretch of the river. The classifications that apply to this <br />segment are Aquatic Life Cold 1, Recreation 1, Water Supply, and Agriculture. No <br />exceedance of any physical, biological, inorganic, or metal standard was noted in either <br />the upstream or the downstream water sample data reported. No identifiable impact to <br />surface water quality or quantity is evident in the data collected and reported. <br />Ground Water Quarriity and Quality <br />The operator believes that the water level plateau established by 2006 measurements <br />in NEW-2 and NEW-4 coupled with a corresponding rapid rise in NEW-3 indicate water <br />is spilling toward the east in the mine workings. The Division concurs with this <br />assessment. Review of Map 22, Mine Progress indicates that once the water level in <br />the workings reache<.~ about 7115 feet above MSL, water would begin to spill eastward <br />down the 4 South entry after overcoming a small rise at about the mid-point along the <br />length of the entry. \Nater level in NEW-3 was rising at about 6 feet per year in the past <br />but is now rising at a rate of about 20 feet per year. Once the water level reaches <br />about 7115 feet in NEW-3, all three wells completed in the mine workings should begin <br />to rise at about the same rate. Since the operator has future plans to begin pumping <br />water from the workings, this may not occur any time in the near future. <br />One water sample in 2005 at NEW-2 indicates no change in TDS, returning a value of . <br />670 mg/I. A sample taken in April 2006 at NEW-4 returned the highest ever recorded <br />TDS value of 1650 mg/I. No explanation is apparent for the significant difference in <br />TDS between these two wells that are separated by about 1900 feet horizontally. <br />Alluvial water levels, as indicated in wells PAW-1 upstream of the mine and PAW-9 <br />downstream of the mine, continue to show normal variation due to seasonal influences <br />and no impact to alluvial water levels can be identified at this time. Water levels have <br />returned to more hisiioric levels following drought conditions in 2000-2002. <br />Alluvial water quality generally remains slightly more saline than the surface water, <br />which recharges the alluvium, but is within an acceptable range for all known and <br />current uses. One exception is PAW-1, where TDS values continue to be low {100 <br />mg/I), although higher than previous years (60 mg/I in 2004-2005, 70 mg/I in 2002- <br />
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