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2021-05-26_REPORT - C1994082
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2021-05-26_REPORT - C1994082
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Last modified
5/26/2021 3:16:19 PM
Creation date
5/26/2021 2:49:30 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
Report
Doc Date
5/26/2021
Doc Name
Annual Hydrology Report Adequacy Review
From
DRMS
To
Twentymile Coal, LLC
Annual Report Year
2019
Permit Index Doc Type
Hydrology Report
Email Name
RAR
JLE
Media Type
D
Archive
No
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Yoast Mine AHR 2019 <br /> Requirement Requirement citation Comment <br /> 18. Basic Standards for CWQCC regulations 41.4 The Yoast Mine did not generate significant amount of <br /> Ground Water and 41.5 leachates in 2019. <br /> 19. Restoration of ground CDRMS regulation For the 2019 water year, it appears that water levels at <br /> water recharge to 4.05.12(3) all wells fell within their historic ranges,with the <br /> approximate pre-mining rate exception of well YGAL16. All alluvial wells <br /> displayed seasonal water level fluctuations in response <br /> to periods of precipitation recharge. <br /> 20. Prevention of adverse CDRMS regulation Compliance with the Basic Standards for ground <br /> impacts to ground water 4.05.11(1) water, as per item 10,indicate the permittee is <br /> systems outside permit area preventing adverse impacts to ground water quality <br /> outside the permit area. Note: no water quality data was <br /> located for Point of Compliance Well SGAL70. <br /> Note: Water level reports as presented in Appendix B <br /> of the AHR Hydrology Report did not indicate average <br /> water levels. <br /> All alluvial wells showed seasonal water level <br /> fluctuations in response to periods of precipitation <br /> or, lack thereof. Overburden and coal well water <br /> levels are fluctuating in response to the precipitation <br /> recharge and ground water flow from the reclaimed <br /> mine pits. <br /> 21. Prevention of impacts to CDRMS regulation No material damage has occurred, as discussed in <br /> ground water that adversely 4.05.11(2) item 20, above. <br /> impact post-mining land use <br /> 22. Minimize disturbance to CDRMS regulation The disturbance to the hydrologic balance within and <br /> hydrologic balance within 4.05.1(1) adjacent to the permit area caused by mining <br /> and adjacent to the permit and reclamation at the Yoast Mine is the minimum <br /> area that can be expected from a reclaimed surface mine at <br /> this location. The operators' use of best management <br /> practices indicates minimization of disturbance to the <br /> hydrologic balance. <br /> 23. Prevention of material CDRMS regulation Surface water: Aprediction was made that increases in <br /> damage to the hydrologic 4.05.1(1) TDS would be observed at various stream sites during the <br /> balance outside the permit irrigation season (June-September). <br /> area Average TDS at all four sites was lower than predicted <br /> for the 2019 water year. <br /> Ground water: In TAB 17 of the PAP, predictions <br /> were made as to the expected TDS increases to be <br /> observed at various monitoring wells. Predicted TDS <br /> values were exceeded at 4 of the 7 sites with the peak <br /> values occurring as far back as 2007 and as recently as <br /> 2014. Although the 4 sites exceeded TDS predictions, <br /> the alluvial wells did not exceed the TDS Point of <br /> Compliance standard for Sage Creek alluvium or <br /> Grassy Creek Alluvium. No material damage has <br /> occurred,as discussed in item 20, above. <br />
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