2019-01-04_REPORT - C1994082 - Laserfiche WebLink

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Peabody Energy, LLC Page 3 2018 Requirement Requirement citation Comment 8. Basic Standards for CWQCC regulations The manganese standard was exceeded six times at six Surface Water 31.1.11 sites. Based on CWQCC reg. 31, the standard of 0.2 mg/l, applies to plants grown in acidic soils (<6.0 pH). In alkaline soils, as found throughout the Youast and Seneca II W region, the EPA standard would be 10 mg/1. The maximum manganese value observed at any surface site was 0.98 mg/l. 9. Instream Numeric CWQCC regulation 33.0 Ten monitoring sites exist within the Sage and Grassy Standards Creek Basins: YSSF3, NPDES 12, NPDES 13, NPDES 14, and YSS2 are on Sage Creek. NPDES 10, NPDES 11, YSGF5, and YSG5 are on Grassy Creek. In addition, Spoil Springs YSSPG3, YSSPG4, and YSSPG5 are found within the Sage Creek Basin and Spoil Springs YSSPGI and YSSPG2 are found within the Grassy Creek/Annand Draw Basin. The receiving stream standard for both Sage Creek and Grassy Creek is on Segment 13e of the Yampa River basin. The stream standards for Sage Creek and Grassy Creek are based on aquatic life standards. Table 13 of the 2017 AHR provides a comparison of the standards to water quality collected from NPDES points and stream sites in the Sage and Grassy Creek Basins. The total recoverable iron standard (1.0 mg/1) was exceeded four times at two sites. A high level mercury test with a method detection limit of 0.2 ug/1 for streams and a low level mercury test with a method detection limit of 0.0002 ug/1 for NPDES sites was run. All high level test values this year were less than the detection limit. NPDES Outfall 013 exceeded the selenium Yampa Segment 13e standard of 4.06 ug/1 chronic and 18.4 ug/l acute, with values of 18.3 ug/1 for potentially dissolved and 18.8 ug/1 for total recoverable. Both exceedances were from a sole sample taken 4 April 2017. The agricultural use standard of 20 ug/1 was not exceeded at this outfall. The exceedances of the selenium stream standard were not NPDES permit limit exceedances. The permit limit for outfall 013 for selenium is to "Report" only.