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<br /> <br />1992/93 AHR Review Page 2 <br />December 13, 1993 <br />^ Continue monitoring Ward Creek to observe whether <br />the conductivity continues to increase. <br />^ Sample for Total Dissolved Solids (TDS) and the <br />main anions and cations in Ward Creek. The <br />y Probable Hydrologic Consequences (PHC) for the Red <br />~•~,~ Canyon Mine predicts that water in the flooded <br />\U ~ ~ ~ workings is likely to acquire a greater salinity <br />and a more sodic character. The only way to <br />determine whether this impact is occurring is if <br />there is an anion and cation balance. In addition, <br />the PHC describes the pre-mining TDS of Ward Creek <br />at 330 mg/1 and a worst case TDS of 900 mg/1. <br />While the creek does not appear to have approached <br />a worst case, it may be worthwhile at this time to <br />characterize more accurately the TDS of Ward Creek. <br />N'~ ^ Sample alluvial wells near Ward Creek to correlate <br />with surface water and spring quality results. <br />^ Sample ground water wells completed in the E seam <br />\~~ to determine at what level the workings have been <br />flooded and to what extent the mine water <br />correlates with surface water and spring quality <br />results. The 1987 AHR projected that water would <br />reach the water level of E-1 at approximately 6355' <br />in 1993. <br />The Division has reviewed data collected for SP-D and SP-DA. Total <br />Suspended Solids (TSS) has been reduced significantly as compared <br />to May 1991. During an inspection the previous year, the Division <br />inspected the portion of the Carbon Ditch in the vicinity of the <br />mine in an attempt to determine why the TSS increased. The ditch <br />is an unlined, earthen channel that appears to be experiencing <br />downcutting and subsequently an increased downstream sediment load. <br />Other possible explanations could be runoff from Joe Belden's <br />property or runoff from the county road. There appears to be no <br />impact to the Carbon Ditch by surface runoff from the mine site. <br />The sediment pond did not discharge during hydrologic year 1992 or <br />1993. There were two seeps noted at the upstream embankment of the <br />sediment pond which left standing water in the pond during the <br />year. <br />^ The Division would recommend Minrec's continuation <br />~' - of sampling the seeps noted in the sediment pond. <br />