Laserfiche WebLink
Seneca II Mine <br />SL -6 Phase M Bond Release Request <br />June 2014 <br />Table 9 indicates that the predicted TDS values in June and July, 497 and 607 mg /1, at Site SSF13 <br />were occasionally exceeded. This is due to the baseline TDS values at Site SSF11 being higher <br />than expected. In any case, the observed TDS increases between the two sites were always less <br />than the predicted values. Also, the highest TDS value on Table 9, 680 mg /1, is still less than <br />2,000 mg /l crop tolerance level indicated above. Therefore, TDS increases on Fish Creek due to <br />the two mines are not causing any significant negative impact to crops in the area. <br />Agnement of observed hydrologic impacts with the 'Probable Hydrologic Consequences" (PHC) projected in the <br />mining permit <br />The Seneca PHC predictions were discussed in the section above Impacts to Alluvial Valley <br />Floors AVFs). The observed TDS values are below the PHC predicted values. <br />Completion of the Hydrologic Reclamation Plan <br />There are four monitoring wells associated with the Seneca II Mine. Well GW -S41 -W (computer <br />id SW41) monitors the Wadge coal (bedrock). Well GW- S4I -LWI (SOV41) monitors the <br />Lennox -Wadge interburden (i.e., Wadge overburden, also bedrock). Well GW -S68 -A (SBAL68) <br />monitors the Bond Creek (008) alluvium. Well 008 -AU -3 (SFAL72) monitors the Fish Creek <br />alluvium. The two bedrock wells are in the permit boundary and will be removed using well <br />abandonment procedures approved by the CDRMS after approval of this bond release <br />application. The two alluvial wells (one of which is a GWPOC well owned by Twentymile Coal <br />Company) exist outside of the permit boundary. Well SBAL68 will be retained until termination <br />of the CPDS permit for Outfall 008. <br />Four bedrock wells were drilled by the USGS in 1987 upstream of Pond 008 and Spoil Spring <br />SSSPG9. They are: 1) Well BL2 (98 feet deep, completed in the Lennox coal), 2) Well BI2 (150 <br />feet deep, completed in the Lennox /Wadge interburden), 3) BW2 (164 feet deep, completed in <br />the Wadge coal, and 4) Well BU2 (175 feet deep, completed in the Wadge underburden). All <br />wells are two inch diameter PVC, and all four are normally flowing. All four wells are capped and <br />pressurized with nitrogen gas to prevent freezing in the winter. Water quality and completion <br />information for these wells may be found in the USGS Open File Report 92 -122; and USGS <br />Water - Resources Investigation Reports 92 -4067 and 92 -4187. These wells will be removed using <br />32 <br />