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2019-02-22_REPORT - C1981019
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2019-02-22_REPORT - C1981019
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Last modified
2/25/2019 9:34:23 AM
Creation date
2/22/2019 12:34:25 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Report
Doc Date
2/22/2019
Doc Name
Annual Hydrology Report
From
Tri-State Generation and Transmission Association, Inc
To
DRMS
Annual Report Year
2018
Permit Index Doc Type
Hydrology Report
Email Name
ZTT
Media Type
D
Archive
No
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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />►I V 1 P !R91TEC <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.16 <br />0.13 <br />0.70 <br />8.40 <br />7.70 <br />11/27/18 <br />11/05/14 <br />Lab Cond. <br />2258.13 <br />145.21 <br />700 <br />2460 <br />1760 <br />08/20/18 <br />05/04/11 <br />TDS <br />1780.00 <br />81.08 <br />320 <br />1920 <br />1600 <br />08/18/11 <br />05/24/17 <br />Sulfate <br />790.94 <br />47.68 <br />205 <br />891 <br />686 <br />05/04/11 <br />11/08/11 <br />Calcium <br />144.28 <br />6.70 <br />22 <br />157 <br />135 <br />08/27/14 <br />11/19/13 <br />Iron <br />0.06 <br />0.04 <br />0.17 <br />0.22 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />192.09 <br />10.42 <br />39 <br />217 <br />178 <br />03/22/11 <br />11/29/17 <br />Sodium <br />138.75 <br />11.98 <br />50 <br />166 <br />116 <br />03/22/11 <br />09/13/16 <br />Elevation <br />20.22 <br />0.93 <br />5.81 <br />21.57 <br />15.76 <br />09/13/16 <br />11/08/11 <br />Evaluation of 2018 data for MJ -95-03 Well <br />Maximum values for Lab pH and Lab Conductivity recorded during this period. Mining <br />commenced on the Collom Pit in the fall of 2018; therefore, not enough data has been <br />acquired to provide any reasonable analysis of the data acquired to date. <br />Trout Creek Well: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />9.20 <br />0.30 <br />0.80 <br />9.50 <br />8.70 <br />08/20/18 <br />03/15/17 <br />Lab Cond. <br />1135.00 <br />39.64 <br />130 <br />1220 <br />1090 <br />03/15/17 <br />11/27/18 <br />TDS <br />710.00 <br />44.08 <br />130 <br />800 <br />670 <br />03/15/17 <br />11/27/18 <br />Sulfate <br />249.88 <br />28.93 <br />88 <br />309 <br />221 <br />03/15/17 <br />11/27/18 <br />Calcium <br />8.50 <br />4.44 <br />11 <br />16 <br />5 <br />03/15/17 <br />11/27/18 <br />Iron <br />0.08 <br />0.06 <br />0.17 <br />0.22 <br />0.05 <br />03/13/18 <br />11/29/17 <br />Magnesium <br />26.50 <br />4.87 <br />16 <br />38 <br />22 <br />03/15/17 <br />09/18/17 <br />Sodium <br />196.38 <br />10.89 <br />30 <br />210 <br />180 <br />05/24/17 <br />11/29/17 <br />Elevation <br />590.41 <br />0.82 <br />1.95 <br />591.02 <br />589.07 <br />09/18/17 <br />08/20/18 <br />Evaluation of 2018 data for Trout Creek Well <br />Maximum values for Lab pH and Iron were recorded in 2018. Minimum values for Lab <br />Conductivity, TDS, Sulfate, Calcium, and Well Elevation were recorded during this <br />period. Mining commenced on the Collom Pit in the fall of 2018; therefore, not enough <br />data has been acquired to provide any reasonable analysis of the data acquired to date. <br />SPOIL SPRING DEVELOPMENT <br />A limited number of low impact spoil springs may develop occasionally, but their aerial <br />extent and low level or non-existent surface flow will have a very minor impact on <br />surface (and shallow groundwater/perched aquifer) water quality and quantity in the <br />future. Colowyo is not aware of any springs that have developed due to rain/snowmelt <br />percolating through the spoil and emerging down gradient. <br />Page 16 <br />
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