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REP04258
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REP04258
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Entry Properties
Last modified
8/24/2016 11:35:24 PM
Creation date
11/26/2007 10:44:40 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Date
12/11/2001
Doc Name
1993 AHR text & streamflow
Annual Report Year
1993
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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C~ <br />• <br /> <br />Hydrologic Dala /nlerprera(ion and <br />combination of low quantities of water <br />available and relatively impermeable bound- <br />ary formations. The assessment is that there <br />is a low impact on the water regime of the <br />mined and adjacent areas. <br />Assessment of Springs <br />Ten of the twenty-six springs monitored <br />during WY 1993 have a relatively constant <br />flow while sixteen springs show definite <br />seasonal variation. A comparison of WY <br />1993 monitoring data with previous years <br />shows no significant trends or changes <br />which can be associated with mining activi- <br />ty. With the exception of Springs G-12 and <br />G-20, springs are consistently responsive to <br />spring runoff. The flow rates of springs G- <br />12 and G-20 are sporadic and many times <br />do not correlate well with other seasonal <br />parameters such as snowpack, precipitation, <br />or streamflow. The springs appear to be <br />characteristic of a relatively shallow ground- <br />water system, independent of deep ground- <br />water sources of flow. These springs appear <br />to be a result of intersection of the surface <br />topography with the potentiometric surface <br />of water captured in alluvial or colluvial <br />materials or by more impervious layers in <br />the form of perched water tables. <br />No clear relationship is shown by data of an <br />impact on springs from mining activities, <br />and none would be expected if the shallow <br />and deep groundwater systems are not hy- <br />draulically connected. There appears to be <br />no impact from mining activities on this <br />shallow regime. The mine workings are at <br />depths up to 1200 feet and ground subsi- <br />dence (transmission of crack up through the <br />overburden or settlement) has apparently not <br />adversely impacted the integrity of the <br />shallow groundwater systems. <br />Assersmen! jor the Permit and Adjacent Arens <br />Field data acquired and reported from <br />springs in the Jumbo Mountain tract and <br />Lone Pine Gulch from September, 1993 to <br />May, 1994 will be discussed in the 1994 <br />AHR. <br />Assessment of <br />Groundwater <br />Some groundwater wells exhibited slightly <br />changed conditions in some instances and <br />the subsidence monitoring deep wells <br />showed some influence from mining. Over- <br />all, however, the wells remained fairly con- <br />stant compared to previous years. <br />Alluvial Wells and the Lower <br />Refuse Pile <br />After approximately five relatively dry <br />years, water levels in well SG-1 rose ap- <br />proximately 20 feet to "historic" normal <br />levels and rose approximately 35 feet in GP- <br />1, exceeding historic ranges for a time. No <br />water was detected in the other GP wells, <br />suggesting that no potentiometric surface has <br />developed in the fill. This may be due to <br />the low vertical permeability of the alluvial <br />and the refuse pile materials, and small <br />quantity of recharge water on (and drainage <br />from) the pile. General relationships of WY <br />1993 data with baseline limits for wells SG- <br />1 and GP-1, and for Sylvester Creek, are <br />summarized in Appendix E. Samples from <br />well SG-1 were within baseline parameters <br />except pH was slightly higher and iron was <br />slightly lower. Ranges of sample parame- <br />ters from GP-1 were much greater, from <br />below to above baseline ranges for pH and <br />manganese, above in iron, and within to <br />above in conductivity. Spring Sylvester <br />Gulch samples exceeded historic ranges of <br />iron and manganese (and total suspended <br />12 <br />
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