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2014-02-05_REPORT - C1994082
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2014-02-05_REPORT - C1994082
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Last modified
3/29/2017 12:50:52 PM
Creation date
2/5/2014 12:56:10 PM
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Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
Report
Doc Date
2/5/2014
From
Katryna Snowden
To
DRMS
Annual Report Year
2013
Permit Index Doc Type
Hydrology Report
Email Name
JHB
DIH
Media Type
D
Archive
No
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Premining manganese values often exceeded the 0.2 mg /1 standard. One <br />site, NPDESI3, exceeded the agricultural selenium standard. This <br />exceedance will be discussed below. <br />Table 13 shows the CDPHE receiving stream standards for Sage and Grassy <br />Creeks (Yampa Segment 13e, Reg. 33, January 2009). These aquatic life <br />standards were based on the presence of fish in the lower portions of <br />the creeks. However, the upper portions that the Yoast Mine discharges <br />into have no fish present. Table 14 provides a comparison of those <br />standards to water quality data collected this year from NPDES and <br />stream sites in the Sage and Grassy Creek basins. Standards that were <br />exceeded are: <br />Iron, Total Rec. <br />5/6 <br />pH <br />1/1 <br />Mercury <br />1/1 <br />Selenium, <br />Diss., chronic <br />2/2 <br />Selenium, <br />Diss., acute <br />1/1 <br />Selenium, <br />Pot. Diss., chronic <br />2/3 <br />Selenium, <br />Tot. Rec., chronic <br />2/3 <br />Zinc, Pot. <br />Diss., chronic <br />1/1 <br />Zinc, Pot. <br />Diss., acute <br />1/1 <br />Sites / # of Excursions <br />The total recoverable iron standard (1.0 mg /1) was exceeded six times <br />this year. Excursions were normally related to high suspended solids. <br />Two excursions for this iron standard occurred this year at NPDES sites <br />(see the following `NPDES Effluent Criteria' section for a further <br />discussion). This strict aquatic life standard was exceeded in 38% of <br />the premining stream samples. <br />The pH standard (6.5 -9.0) was exceeded on May 2 at NPDESI3 with a value <br />of 9.53. The cause was most likely algae growth. See the following <br />NPDES Effluent Criteria' section for a further discussion. <br />12 <br />
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