Laserfiche WebLink
0 2008 AHR McClane & Munger Canyon Mines Page 5 <br />PHC East Salt Creek <br /> SW-1 Upstream SW-8 Downstream Change <br />Total Dissolved Solids <br />1S Quarter 2008 1972 1936 -36 <br />2" Quarter 2008 1060 1147 +87 <br />3` Quarter 2008, 1712 1622 -90 <br />The quality of the water at the upstream monitoring point was better than the <br />downstream monitoring point during the second quarter when the mine discharge could <br />have had a minor impact on the upstream quality. Based on this analysis, the mine <br />discharge had a negligible impact on the quality of East Salt Creek. Total dissolved <br />solids (TDS) in the above tables are laboratory values in mg/I. <br />Groundwater <br />Table 5 shows the results of groundwater sampling during the water year. Baseline data <br />from the 1981 & 1986 monitoring is also shown. Results of quality sampling are <br />consistent with the results from previous years. GW-4 in close proximity to a hay field <br />that is irrigated during dry periods and in danger of being eroded with an oxbow has been <br />replaced with GW-3. GW-3 is located adjacent to the road south of GW-4 and should be <br />outside of the influence of the irrigation of the hay field. Refer to Figure 4.2-2 of the <br />McClane Canyon Permit. The Division of Reclamation, Mining and Safety has approved <br />• this substitution. Ground water wells GW-2, GW-4, GW-7, and GW-8 were sealed <br />during 2007. <br />Pond Discharges <br />There was no discharge from the Munger sediment pond during the water year. There <br />was one discharge in February from the McClane sediment pond. The water quality of <br />the discharge met discharge permit requirements. The sediment fences at McClane, <br />Munger Canyon and Loma were maintained as necessary. <br />Discharge monitoring from the sediment ponds and mines are regulated by the Colorado <br />Discharge Permit System Numbers CO-0038342 (McClane) and CO-0040827 (Munger). <br />Copies of Quarterly Discharge Monitoring Reports have been provided, under separate <br />cover, to the DMRS at the same schedule required by the CDPS Permit. They are included <br />in this report by reference. <br />McClane Creek Temporary Diversion <br />The Operator placed four wooden gabions in the McClane Creek channel during 1997 to <br />ensure the channel would remain stable. The gabions were to provide a solid place in <br />the channel bottom to limit any further erosion. In 2004 a re-survey was conducted and <br />the data and inspection observations show there has been significant erosion <br />subsequent to the 1997 gabion installation. Future high flow events may result in <br />additional channel scour and side-cutting erosion. Portions of the diverted channel <br />appeared to be unstable and further erosion may be likely. To alleviate this problem, the <br />operator installed a 48" culvert ("P") under the haul road during 2006 in order to <br />reconnect upper McClane Creek to it's original lower segment. <br />• <br />Rev. 08/09