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2015-02-26_REPORT - C1981028
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2015-02-26_REPORT - C1981028
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Last modified
3/29/2017 10:35:21 AM
Creation date
2/26/2015 12:49:22 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981028
IBM Index Class Name
Report
Doc Date
2/26/2015
Doc Name
Annual Hydrology and Reclamation Report
From
Coors Energy Company
To
DRMS
Annual Report Year
2014
Permit Index Doc Type
Hydrology Report
Email Name
TNL
DIH
Media Type
D
Archive
No
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Laboratory analysis: <br />The wells are sampled in a sequence that follows the order of least to <br />greatest level of salinity. At the end of 2013 this sequence continued to be: <br />(1) FPW, (2) AMW -1, (3) DH -96, (4) DH -122, (5) SMW -2 and (6) AMW -2. <br />Ash Monitor Well No. 2 (AMW -2) still continues to recharge following the <br />conclusion of the A -Pit reclamation activity. This process has been <br />ongoing since the end of 1999 when A -Pit reclamation was completed, but <br />only since 2004 has it resulted in volumes sufficient to allow sampling. <br />Adequate water volumes were found in this well during each of the semi- <br />annual samplings for 2013, making it possible to obtain samples following <br />the standard three -well volume purge procedure. While the well bore water <br />level recovery following testing remains slower, higher static water levels <br />provide evidence that the highly disturbed zone in the reclaimed overburden <br />area is recharging. The timeline for this recharge is consistent with previous <br />predictions. <br />Copies of the analytical laboratory test results are found in the pages <br />following this text. Each ground water monitoring well was sampled in <br />accordance with the "permit procedure ". The `B" designation following the <br />well identification confirms that the laboratory sample was obtained after <br />initial field sampling, well purging and a subsequent (second) field <br />sampling. The 2014 ground water monitoring test results remain consistent <br />with results from previous year's analyses in that there have been no <br />confirmed statistical exceedences, with but one exception, the samples <br />obtained from the SMW -2 well during 2004. The SMW -2 well is <br />completed in the disturbed spoil material which is being subjected to slow <br />re- saturation by ground water, and appears to be leaching dissolved <br />minerals as the water table rises. This has caused manganese concentrations <br />to somewhat exceed the calculated tolerance limit. CEC addressed this <br />tolerance limit exceedence with CDPHE during 2005, and was granted <br />permission to continue the current detection monitoring program [Doty & <br />Associates letter dated 04108105, "Alternate Source Demonstration, <br />Statistically Significant Increase Over Background Manganese in SMW -2, <br />Fourth Quarter 2004, Keenesburg Disposal Facility"]. <br />The direction of ground water flow, to the extent that it has been <br />documented in the area of the Keenesburg Mine property, trends <br />downgradient to the northeast. Recharge of the aquifer in the "spoil area" <br />continues to be limited to a single source, the localized infiltration of <br />36 <br />
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