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Seneca 11 Mine <br />SL -6 Phase 111 Bond Release Request <br />June 2014 <br />well abandonment procedures approved by the CDRMS after approval of this Phase III bond <br />release application. <br />The ditches and drainages shown on Map 2 represent the permanent drainage features in the <br />Phase III bond release area and were addressed in TR -37 approved in September 2006 and <br />updated in PR -2 in December 2010. Permanent Impoundment 008 has been discussed <br />previously. There are no permanent wells in the Phase III bond release area. Monitoring wells <br />TR3 and TR4 were transferred to landowners, wells TR15 and WR 1 were reclaimed in August <br />2009 and the sites inspected in September 2009. The Division approved termination of the water <br />monitoring program with the approval of Technical Revision No 48 (TR 48) on August 20 2009. <br />Findin <br />,gs of the Protection of Hydrolo gic Balance <br />The observed hydrological impacts at the Seneca II Mine are consistent with those predicted in <br />the PHC section of the permit package. With the exception of the occasional excursion of the <br />aquatic life selenium standard at Outfall 008, water pollution is not occurring at the Seneca II <br />Mine, and there is no potential for future water pollution. Water quality at the alluvial Ground <br />Water Point of Compliance ( GWPOC) well is within the prescribed limits, with the exception of <br />iron at Well SFAL72. However, the high levels of iron displayed at this Well SFAL72 are likely <br />the result of naturally occurring organic matter and plant debris present in the alluvium. Bedrock <br />GWPOC wells were deemed to be not necessary, based on the absence of the potential for the <br />mine to negatively impact the quality of bedrock ground water. <br />The Seneca II Mine has provided CDRMS annual hydrology reports (AHRs) since 1980. <br />Additional hydrology data may be found in those reports. <br />REFERENCES <br />Hem, John D. 1989. "Study and Interpretation of the Chemical Characteristics of Natural Water" <br />USGS Water Supply Paper 2254, Third Edition <br />EPA. 1976. "Quality Criteria for Water" <br />33 <br />