2009-02-26_REPORT - C1982057 (10)

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• The Seneca II-W PHC, Table 17-42b, predicts an irrigation season (June- September) average TDS value of 676 mg/l on Sage Creek, while a value of 665 mg/l was observed this year. Springs. Spring data may be found after surface water data in Appendix E. Data provided are a water quality report for the past two years, historic flow measurements and remarks, a LOWESS plot of TDS or electrical conductivities (EC, corrected to 25° C, since 10/1/89), and a historic listing of percent milliequivalents of major ions and TDS. Baseline water quality statistics for springs downstream of mining (when available) has been provided in Appendix E1. Springs with a flow less than 5 gpm (0.011 cfs) are analyzed for field parameters only. In Appendix E, all native springs have a WSPG prefix (e.g., Spring 5-45 = WSPG45) while all spoil springs have a WSSPG prefix. Spring 5-46 is a developed spring first monitoring during the 1979 spring survey. This spring became part of the required monitoring . program in 2000. It is located immediately below the 005 Pond. The EC plot indicates an increasing trend. Spring S-47 was first discovered by SCC personal in 1989 and was monitored first in June 1990. It is a developed spring existing alongside the mine entrance haul road just to the west of the Seneca II- W Meteorological Station. This spring became part of the required monitoring program in 2000. Its EC plot indicates a decreasing trend. Spring 5-50 is the discharge of the french drain that collects water from the W-24 series monitor wells (located below Pond 16A) that failed in 2003. This water was first sampled in September 2005. The W-24 wells were finally abandoned in August 2007. Its EC plot indicates an increasing trend. Spring S-7 in an alluvial clearwell located adjacent to Hubberson Gulch. It serves as the non-potable water supply at the Smith ranch. Due to the taste and possible coliform contamination of the spring, bottled water 18