Laserfiche WebLink
COLORADO LEGACY LAND <br /> $CHWARTZWALDER MINE <br /> TABLE E-5:SUMMARY OF WATER TREATMENT PLANT OPERATIONS FOR FOUR CONSECUTIVE OPERATING <br /> YEARS <br /> WTP Operations Dissolved Mine Pool <br /> Year Uranium Dewatering Notes <br /> Summary (mg/L) Summary 3 <br /> Operated 47%of the year. Feet Gained= 51 feet <br /> 2018 Online= 171 days. 12.19 Max.Depth= 201 fbS In situ injection in <br /> December 2017. <br /> Offline= 194 days. (6,401 ft amsl) <br /> Operated 66%of the year. Feet Gained=46 feet Installed new 60 hp <br /> 2019 Online= 241 days. 13.73 Max.Depth= 246 fbS dewatering pump <br /> Offline= 124 days. (6,356 ft amsl) at—410 fbS. <br /> Operated 47%of the year. Feet Gained=99 feet <br /> 2020 Online= 172 days. 12.56 Max.Depth= 345 fbS In-situ injection in <br /> Offline= 194 days. (6,257ft amsl) January 2020. <br /> Operated 37%of the year. Feet Gained=—20 feet <br /> 2021 Online= 134 days. 19.802 Max.Depth> 345 fbS In-situ injection in <br /> Offline= 231 days. (>6,257 ft amsl) October 2021. <br /> Notes: <br /> ' Mean concentration of mine pool sample results.For comparison,the mean concentration of dissolved <br /> uranium in the mine pool from 2000- 2007 was 41.14 mg/L. (Source:Whetstone Associates.2007.) <br /> Z The mean concentration of mine pool sample results for 2021 do not include data collected during the <br /> fourth quarter because this report was prepared concurrent with the sample analysis. <br /> 3"Feet gained"is a measure of the storage created in the mine pool,measured as feet below the <br /> regulatory level (150-feet below the Steve Adit). <br /> -Approximately <br /> amsl-Above mean sea level <br /> fbS-Feet below Steve Level (6,602 ft amsl) <br /> ft amsl- Feet above mean sea level <br /> mg/L-milligrams per liter <br /> WTP-Water Treatment Plant <br /> E.5.3. Tracer Test <br /> During 2020,a two-chemical tracer test was conducted in the mine to evaluate the system hydraulics and the <br /> degree that organic carbon placed underground would disperse within the mine workings to facilitate in-situ <br /> treatment.A complete description of the tracer test is provided in Appendix 2.During the duration of the tracer <br /> test,there was no flow leaving the mine as confirmed by the mine pool elevation being consistently below the <br /> regulatory limit and the demonstrated inward gradient shown toward the mine compared to surrounding <br /> groundwater monitoring wells.Based on the absence of tracer concentrations in the WTP discharge,the tracers <br /> remained in the mine.Therefore,the mine is a hydrologic sink,e.g.,mine pool water is not exiting the mine. <br /> AUGUST 2022 34 AMENDMENT 6 <br />