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2015-11-05_PERMIT FILE - C1981014
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2015-11-05_PERMIT FILE - C1981014
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Last modified
8/24/2016 6:12:18 PM
Creation date
11/17/2015 10:08:53 AM
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Template:
DRMS Permit Index
Permit No
C1981014
IBM Index Class Name
Permit File
Doc Date
11/5/2015
Section_Exhibit Name
2.04.7 HYDROLOGY INFORMATION
Media Type
D
Archive
No
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• and continuing erosion and downcutting of sedimentary channel materials <br />in transitional segments and lower drainage reaches. Percolation of <br />surface water through colluvial/alluvial terrace deposits and discharge <br />to the surface water system along with reduced volumes as a result of loss <br />to the groundwater system through the more permeable stream channel <br />materials are primary factors effecting variability in TDS levels. <br />There was essentially no baseline water quality information available at <br />the time of initial permit submittal. Consequently, all existing water <br />quality data is the result of Dorchester's and subsequently EFCI's ongoing <br />monitoring programs initiated as a result of Stipulation No.2 to the <br />original permit approval. Consistent with typical water quality <br />relationships, there is a significant correlation between variations in <br />water quality and fluctuations in stream flow volumes. As a general rule <br />TSS levels are directly related to stream flows with increases in runoff <br />and flow volume resulting in increased erosion and sediment transport with <br />• corresponding increases in TSS levels. Under normal conditions TDS levels <br />are inversely related to stream flows with elevated runoff and stream <br />flows resulting in decreased leaching of soluble mineral components and <br />significant dilution of normal mineral constituents in natural drainage. <br />However, the high degree of variability in TDS levels and elevated values <br />of certain mineral constituents during high flow periods indicate that <br />other hydrologic and chemical mechanisms may be at work. <br />The majority of the mine area is drained by the lower portion of Newlin <br />Creek which includes several tributary streams including Magpie Creek. <br />Existing water quality monitoring data has been summarized in Table 16, <br />Newlin Creek Water Quality, which presents minimum, maximum and mean <br />analysis values for major chemical constituents and analysis parameters. <br />This summary indicates that surface drainage in the mine and adjacent <br />areas is slightly alkaline with average TDS and TSS levels of <br />approximately 150 and 10 mg/1 respectively. Within the mine area, <br />variations in TSS and TDS with flow generally follow the anticipated <br />• pattern with an inverse relationship for TDS and a direct relationship for <br />TSS as illustrated by Figure 9, Newlin Creek Flow Rate Vs TDS and TSS. <br />However, there is some evidence of significant increases in TDS levels in <br />conjunction with peak stream flows. This observed anomaly may be the <br />2.04.7-36 <br />
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