2013-12-11_REPORT - C1994082 - Laserfiche WebLink

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Page 3 of 5 the EPA standard would be 10 mg /1. The maximum manganese value observed at any surface site was .88 mg /1. 9. Instream Numeric CWQCC regulation 33.0 Ten monitoring sites exist within the Sage and Grassy Creek Standards 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. The receiving stream standards 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 14 of the 2012 AHR provides a comparision of the standards to water quality collectedfrom NPDES points and stream sites in the Sage and Grassy Creek Basins. The total recoverable iron standard (1.0 mg /1) was exceeded five times at four sites, with no NPDES exceedances for iron occurring during the 2012 water year. The pH standard of 6.5 -9.0 was exceeded in July at NPDESI3 (9.07 pH). Nitrite standard (0.05 mg /1) was exceeded at YSS2 (0.06). The chronic selenium standard of 4.6 ug /I was exceeded twice at NPDESI3 (5.4 and 8.4) and once at NPDES12 (5.2). 10. Interim Narrative CWQCC regulation It was determined that bed rock groundwater points of Standard for Ground Water 41.5.C.6 compliance are unwarranted at the Yoast Mine. Well SGAL70 serves as the Yoast Mine's Grassy Creek Alluvial ground water point of compliance and well YSAL3 serves as the alluvial ground water point of compliance for Sage Creek. Ambient values for this site were below the Reg. 41 standards during the 2012 water year. 11. Sampling frequency at Tab 15, Table 15 -9 of The report indicates that all frequencies were met. surface water CDRMS mining permit C- 1992 -084 12. Parameters to be Tab 15, Table 15 -4 and Parameters to be sampled are conductivity (umhos /cm), pH sampled at surface water 15 -5 of CDRMS mining (units), temperature (C), total recoverable iron (mg /1), sites permit C- 1992 -084 dissolved manganese (mg /1), total mercury (ug /1), dissolved nitrate (mg /1), dissolved nitrite (mg /1), total ammonia (mg /1), dissolved selenium (ug /1), dissolved sulfate (mg /1), total sulfide (mg /1), total suspended solids (mg /1) and total dissolved solids (mg /1). All required parameters were analyzed. All parameters were met. 13. Filing frequency of pond CDRMS regulation Pond 008 remains as the only sediment pond associated with reports 4.05.9(17) C- 1980 -005. Quarterly pond inspections were conducted within the appropriate quarter. 14. Timely filing of pond CDRMS regulation Quarterly pond inspection reports were submitted and reports 4.05.9(17) received by the Division within an appropriate timeframe. 15. Content of pond reports CDRMS regulation All required information was addressed on quarterly 4.05.9(15) sediment pond inspection in water year 2012.