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Yoast Mine AHR 2020 <br /> Requirement Requirement citation Comment <br /> 8. Basic Standards for CWQCC regulations There were no exceedances of the agricultural use <br /> Surface Water 31.1.11 surface water standards. Based on CWQCC reg. 31, <br /> the standard of 0.2 mg/l, applies to plants grown in <br /> acidic soils (<6.0 pH). In alkaline soils, as found <br /> throughout the Yoast and Seneca IIW region, the EPA <br /> standard would be 10 mg/l. <br /> 9. Instream Numeric CWQCC regulation 33.0 Nine monitoring sites exist within the Sage and <br /> Standards Grassy Creek Basins: YSSF3,NPDES 12,NPDES 13, <br /> NPDES 14,and YSS2 are on Sage Creek. NPDES <br /> 10,NPDES 11,YSGF5,and YSG5 are on Grassy <br /> Creek. In addition, spoil springs YSSPG3, YSSPG4, <br /> and YSSPG5 are found within the Sage Creek Basin <br /> and spoil springs YSSPG 1 and YSSPG2 are found <br /> within the Grassy Creek/Annand Draw Basin. The <br /> receiving stream standard(aquatic life), for both Sage <br /> Creek and Grassy Creek are on segments 13e; 131 and <br /> 13j respectively of the Yampa River basin. <br /> The stream standards for Sage Creek and Grassy <br /> Creek are based on aquatic life standards. <br /> The total recoverable iron standard (1.0 mg/1) was <br /> exceeded once each at the YSG5 and YSS2 sites. <br /> There were no exceedances of NPDES standards in the <br /> Grassy Creek or Sage Creek segments. There were no <br /> exceedances of the agricultural use standard <br /> A high level mercury test with a method detection <br /> limit of 0.2 ug/1 for streams and a low level mercury <br /> test with a method detection limit of 0.0002 ug/1 for <br /> NPDES sites was run. All high level test values this <br /> year were less than the detection limit. <br /> A single exceedances of the selenium standard at <br /> NPDES 12,did not appear to constitute a NPDES <br /> permit limit exceedance. <br /> 3 <br />