2016-08-25_REPORT - C2009087 - Laserfiche WebLink

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Peabody Sage Creek Mining, LLC Page 7 8/25/2016 Mercury monitoring is no longer required for PSCM's outfalls. 10. Interim Narrative CWQCC regulation 41 It was determined that bedrock groundwater points of Standard for Ground compliance are unwarranted at the PSCM mine. Well Water SGAL70 serves as the PSCM Grassy Creek Alluvial groundwater point of compliance. This wells was approved to be the groundwater point of compliance well for the original Seneca 11 mine (see TR -47 and Attachment 7-3 of the C-1980-005 permit for details). Table 7 of the AHR provides the Ground Water Point of Compliance Standards for the SGAL70 Alluvial Well. Upon review of the 2015 data for SGAL70, none of the standards from Table 7 were exceeded with the exception of Cadmium. On September 8, 2015 the Cadmium level was reported to be <10 ug/1. The Table 7 standard for Cadmium is 5 ug/l. The Reg. 41 standard to Cadmium is 10 ug/l. Given this, it appears the level reported for Cadmium at well SGAL70 is below the CWQCC Regulation 41 standard. 11. Sampling frequency Volume 1, p. 2.04-107 All required sampling frequencies were met with the at surface water of CDRMS mining exception noted below: permit C-2009-087 • SSPG6 was not monitored as required. PSCM indicates this spring was final bond released and therefore did not need to be sampled. This spoil spring has not been bond released and will need to continue to be sampled. The Division is currently reviewing Technical Revision No. 9 for the PSCM which is modifying the currently approved monitoring plan. • SSPG7 was not monitored. According to the PSCM 2015 AHR, this spring no longer exists. The Division is currently reviewing Technical Revision No. 9 for the PSCM which is modifying the currently approved monitoring plan. 12. Parameters to be Volume 1, p. 2.04-108 All required parameters were analyzed with the exception sampled at surface of CDRMS mining noted below: water sites permit C-2009-087