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2011-09-07_PERMIT FILE - C1981028A
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2011-09-07_PERMIT FILE - C1981028A
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Last modified
8/24/2016 4:42:58 PM
Creation date
11/2/2011 2:56:36 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981028A
IBM Index Class Name
Permit File
Doc Date
9/7/2011
Doc Name
pg 34 to 101
Section_Exhibit Name
2.04 Environmental Resources
Media Type
D
Archive
Yes
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Subsurface Water Monitoring and Analysis <br />• Since the initiation of a formal ground-water sampling program in January, 1982, <br />subsurface water quality information has been collected from monitor wells at the <br />Keenesburg Mine. The present ground-water monitoring program provides <br />information which can be compazed to the eazlier baseline conditions relative to <br />groundwater movement and quality in the formerly active operations areas (now <br />used for ash disposal as part of the reclamation effort). <br />The results obtained from data collected in the field and from comprehensive water <br />quality analysis indicate that surface and ground-water quality has not been <br />significantly impacted by the mining operation, nor altered from the natural pre- <br />mising condition. In addition, regional ground-water movement patterns have not <br />been significantly influenced, altered or interrupted by the mining or reclamation <br />activities. <br />The subsurface water wells are monitored on a quarterly basis by Coors Energy <br />Company employees. The six (6) wells presently monitored are: <br />1) FPW <br />2) DH-122 <br />3) DH-96 <br />4) AMW-1 ' <br />• 5) SMW-2 ' <br />6) AMW-2 <br />Note: This is also the order in which the wells are sampled, based on <br />historic and present salanity levels. "Analysis" includes both field and laboratory <br />work performed on samples taken from all wells. <br />The sampling procedure to be used is described herein: <br />The order of samp]ing of the wells is determined based on the historical <br />salinity level of each of the wells relative to the others. The well with the <br />lowest salinity level is sampled first, followed by the others, in increasing <br />value. This order will protect each well against possible data <br />contamination from a higher salinity well. Following a visual examination <br />of the physical condition of the surface area around the well casing, and the <br />casing itself for damage or unusual conditions, the cap is removed and the <br />static water level is measured, from the top of the well casing, and <br />recorded. A one (1) liter sample bailer is used to remove five (5) bailer <br />volumes of water. The fifth bailer volume is used to rinse the field sample <br />containers. A sixth bailer volume is used to fill the field sample container. <br />The field sample is then analyzed and values are recorded for temperature, <br />pH, and electrical conductivity. <br /> <br />56 <br />
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