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2010-02-19_REPORT - C1980001 (4)
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2010-02-19_REPORT - C1980001 (4)
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Last modified
8/24/2016 3:59:51 PM
Creation date
2/19/2010 12:44:21 PM
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Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
REPORT
Doc Date
2/19/2010
Doc Name
2009 Annual Hydrology Report
From
WWC Engineering
To
DRMS
Annual Report Year
2009
Permit Index Doc Type
Hydrology Report
Email Name
JDM
Media Type
D
Archive
No
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and reclamation activities and, as such, the pattern is anticipated to continue. However, since <br />this occurrence existed prior to the initiation of Moffat mining activity, the trend may also <br />' suggest that inflow from undisturbed areas upstream and downstream of TR-C contains <br />approximately the same concentrations of these parameters as runoff from the mine. <br />Calcium, magnesium and sodium concentrations exhibited similar trends in 2009 as found during <br />baseline studies and previous years monitoring. All three parameters show a slight increase in <br />concentration from the 2008 sampling season and an overall decreasing trend since the 1996 <br />' sampling season in agreement with the TDS trend. The lowest calcium concentration in 2009 <br />was recorded at monitoring site TR-A in April with a value of 27 mg/L and the high was <br />recorded at monitoring sites TR-C and TR-D in April with a value of 100.0 mg/L. The lowest <br />magnesium concentration in 2009 was recorded at monitoring site TR-A in April a value of 10.0 <br />mg/L and the high was recorded at monitoring site TR-C in April with a value of 71.0 mg/L. The <br />' lowest sodium concentration in 2009 was recorded at monitoring site TR-A in August with a <br />value of 3.0 mg/L and the high was recorded at monitoring sites TR-C and TR-D in April with a <br />value of 16.0 mg/L. <br />3.3.7 Surface Water Bicarbonate and Sulfate <br />' Charts 10, 11 and 12 show bicarbonate and sulfate concentrations and the sulfate/bicarbonate <br />ratio for monitoring sites TR-A, TR-B, TR-C and TR-D for the period of record. As noted in <br />L previous annual hydrology reports, upstream of the mine on Trout Creek, bicarbonate is the <br />major anion with sulfate concentrations increasing rapidly along the mine area to become <br />predominating downstream. The sulfate level increase is most markedly noticed prior to the peak <br />' flow period of Trout Creek and adjacent to where mining activity took place, as are TDS levels in <br />general. This increase is probably caused by early runoff at the mine site leaching pyritic and <br />organic sulfur as flow passes over and through the spoils. Since the flow of Trout Creek is low at <br />' that time, the amount of sulfur is sufficient to cause an ionic shift from a bicarbonate type water <br />to a sulfate type. During periods of higher flow and late in the season when runoff from the mine <br />is small relative to total Trout Creek flow, the sulfate component is less able to shift the anion <br />t balance to a sulfate type with concentrations of bicarbonate and sulfate being approximately <br />equal downstream. <br />The 2009 data is similar to previous monitoring data indicating a trend that shows a topological <br />change occurring generally at TR-B. This is believed to be the result of the spoil spring, which <br />' has developed at the base of the West Ridge mining area. As reclamation of West Ridge <br />matures, the high levels of sulfur exhibited in the spring are anticipated to decrease. The recent <br />trend showing peak sulfate levels at TR-C and TR-D are expected to continue for some time as <br />' spoil springs in the Moffat area have developed after the completion of mining in that area. Like <br />the West Ridge area the sulfate sources within the Moffat area are anticipated to diminish as <br />vegetation establishes and matures. An overall trend indicates a decrease in sulfate since the <br />1996 sampling season. <br />While peak levels of individual constituents may be shifting as flow proceeds past the mine, they <br />Page 7 <br />??'-?Y Y."........
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