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2020-07-06_GENERAL DOCUMENTS - C1994082
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2020-07-06_GENERAL DOCUMENTS - C1994082
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Last modified
7/7/2020 2:28:12 PM
Creation date
7/7/2020 2:26:00 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
General Documents
Doc Date
7/6/2020
Doc Name Note
For SL7
Doc Name
Proposed Decision and Findings of Compliance
From
DRMS
To
Seneca Property LLC
Permit Index Doc Type
Findings
Email Name
RAR
JLE
Media Type
D
Archive
No
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Instream Numeric Standards (CWQCC 33) <br />The SL7 Phase III bond release area discharges surface runoff and spoil leachate into Segments <br />13e (Sage Creek and tributaries), Segment 13i (upper Grassy Creek), and Segment 13j (lower <br />Grassy Creek) of the Yampa River in CWQCC's Region 12 of the Yampa River Basin. The <br />stream standards for Sage Creek and Grassy Creek are based on aquatic life standards. <br />SPL is required to monitor 14 of the parameters in Segment 13e, 131, and 13j per CWQCC and <br />CDRMS. A review of the statistical summary of the water quality data provided in Yoast <br />Mine's Annual Hydrology Reports and specifically for the past three years was conducted for the <br />mine's NPDES Outfalls (NPDES 10, NPDES 11, NPDES 12, NPDES 13, NPDES 14) and stream <br />sites YSSF3, YSS2, YSGF5, and YSG5. The total recoverable iron standard (1.0 mg/1), was <br />exceeded a total of six times at site YSG5 from <br />2014 to 2018 on Segment 13j. YSG5 receives <br />drainage from outfalls 010 and 01 l and over the <br />course of 2014 through 2018 no exceedance of the <br />iron standard was measured at either outfall. <br />The total recoverable iron standard (1.0 mg/1), <br />was exceeded a total of six times at site YSG5 <br />from 2014 to 2018 on Segment 13j. YSG5 <br />receives drainage from outfalls 010 and 011 and <br />over the course of 2014 through 2018 no <br />exceedance of the iron standard was measured at <br />either outfall. <br />II The total recoverable iron standard (1.0 mg/1), is <br />7 higher at site YSGF5 than at site YSG5. YSGF5 <br />receives drainage from outfalls 010 and 011 and <br />%J over the course of 2014 through 2018 no <br />exceedance of the iron standard was measured at <br />either outfall. Exceedances at the upstream <br />YSGF5 and downstream YSG5 indicate that the <br />exceedances are not likely caused by runoff from <br />Photo 4: Constructed Drainage YPM7 the site and are generally observed during <br />snowmelt runoff. On Segment 13e, the recoverable iron standard was exceeded twice at YSS2 <br />between 2014 and 2018. No exceedance occurred upstream at YSSF3 during this time frame, and <br />upstream at Ponds 12, 13, and 14, where monitoring also occurred, showed these outfalls meeting the <br />Segment 13e standard. Therefore, the exceedances are not likely caused by runoff from the Yoast <br />Mine. Exceedances at the upstream YSS3 and downstream at YSS2 indicate that the exceedances <br />are not likely caused by runoff from the site and are generally observed during snowmelt runoff. <br />The SPL includes four monitored spoil springs (YSSPGI through 4). Spoil Spring 2 (YSSPG2), <br />flows into Annand Draw and Pond 011 (NPDES 11) respectively. Due to the fact that the post - <br />mining land uses for the Yoast Mine have been approved as grazing and wildlife habitat, a review <br />of the water quality data was compared to the CWQCC surface water agricultural standards. The <br />CWQCC Regulation 31, applies to plants grown in acidic (<6.0 pH) soils. In alkaline soils, as <br />found in the Yoast permit area, a more appropriate standard for manganese is 10 mg/1. The 10 <br />mg/1 standard was not exceeded during the past five water years (2013-2018). And, no <br />Permit Number C-1994-082 Page 18 of 23 <br />
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