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2010-11-02_HYDROLOGY - C1981010
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2010-11-02_HYDROLOGY - C1981010
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Last modified
8/24/2016 4:26:27 PM
Creation date
11/2/2010 1:41:52 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
HYDROLOGY
Doc Date
11/2/2010
Doc Name
2009 AHR Review Letter
From
DRMS
To
Trapper Mining, Inc
Permit Index Doc Type
Hydrology Report
Email Name
RDZ
Media Type
D
Archive
No
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Require- <br /> ment <br />Requirement Regulation complied Comment <br /> with? <br /> (yes / no) <br />N. Timely filing of CDRMS <br />pond reports regulation yes <br /> 4.05. 9(17) <br />0. Content of pond CDRMS <br /> <br />reports regulation yes <br /> 4.05. 9(17) <br />P. Sampling Table 4.8-13a <br /> <br />frequency of of CDRMS Generally <br />Radium 226 only sampled once a year but should be sampled <br />groundwater mining yes, but see twice a year for 4 sites: GF-4, GF-5, GF-7, and GMP-1. <br />monitoring wells permit C-81- comment <br /> 010 <br />Q. Parameters to be Table 4.8-13 <br />analyzed in of CDRMS <br />groundwater mining yes <br />samples permit C-81- <br /> 010 <br /> Based on previous analysis by DRMS staff, the Third White <br /> Sandstone aquifer is the only bedrock stratigraphic unit having <br /> significant permeability that is in the groundwater flow path of any <br /> coal spoil leachate; therefore, the Third White Sandstone is the <br /> only bedrock stratigraphic unit whose ground water quality may be <br /> negatively impacted by mining at Trapper. Well GP-9 monitors the <br /> Third White Sandstone immediately downgradient from Trapper's <br /> pits at a location where a leachate plume can be expected to form, <br /> as explained in the PHC (Section 3.8.3 of the permit). Well GP-9 <br /> is Trapper's ground water point of compliance for the Third White <br /> Sandstone as explained on permit page 2-242. In general, 2009 <br /> data from well GP-9 does not exceed Basic Standards for Ground <br /> Water for a Domestic Use classification. (This classification is for <br /> the Third White Sandstone in a Specified Area that extends <br /> outward from Trapper's northern permit boundary on the east half <br /> CWQCC of the mine to the axis of the Big Bottom Syncline, a distance <br />R. Basic Standards regulations es ranging between 1/2 and 3/4 mile from the boundary.) There are <br />for Ground Water y exceedances of drinking water standards for Fe and Mn; however, <br /> 41.4 and 41.5 Fe and Mn exceedances also occurred in GP-9 prior to mining in <br /> the area upgradient of this well. Furthermore, other hydrogeologic <br /> and water quality factors indicate that coal spoil leachate has not <br /> reached GP-9. <br /> Trapper is not expected to negatively impact water quality in the <br /> Third White Sandstone aquifer outside Flume Gulch, as <br /> documented previously by DRMS staff. <br /> Flume Gulch alluvium could also be contaminated by coal spoil <br /> leachate. The Coy well is the ground water point of compliance for <br /> the Flume Gulch alluvium, as explained on page 4-242 of the <br /> permit application. Data from the Coy well in 2009 indicate no <br /> exceedances of the Basic Standards for Ground Water for the <br /> classification of Agricultural Use. <br />Page 3
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