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taste and possible coliform contamination of the spring, bottled water <br />is used for drinking. Sampling at this spring was discontinued in 1990, <br />but was reestablished in 1999 since it is downstream of mining at the <br />Seneca II -W South area. Its TDS plot indicates a recently decreasing <br />trend (SF 0.5), with the peak value occurring in September 2006. <br />The hydrology monitoring program at the Seneca II -W Mine requires a <br />spoil spring survey every year after the spring snowpack runoff. Spoil <br />Spring I (WSSPGI, not to be confused with WSPG1) was discovered in 1998 <br />above the NPDES 005 pond (D pit area). It existed approximately 800 feet <br />southeast of Well GW- S2W -14W. Its TDS plot indicates an increasing <br />trend. <br />Spoil Spring 2 (WSSPG2) was discovered in June 1999. It is located in <br />the main stream channel above Pond 006 adjacent to the oil well. Its TDS <br />plot indicates an increasing trend. <br />Spoil Spring 3 (WSSPG3) was discovered in September 1999. It is located <br />immediately to the east of Pond 006. Its TDS plot indicates an <br />increasing trend. <br />Spoil Spring 4 (WSSPG4) was first sampled in 2003. It contains the <br />combined discharges of the backfilled A and B pits. It is sampled at the <br />outlet of the haul road culvert just above Pond 006. Its TDS plot <br />indicates an increasing trend. <br />Spoil Spring S (WSSPG5) was first sampled in June 2006. It is located <br />just above the large culvert that feeds into Pond 016A. Its TDS plot <br />indicates a decreasing trend. <br />Spoil Spring 6 (WSSPG6) was first sampled in July 2011. It is located at <br />the discharge of Stock Tank 25, which was above Pond 017. The stock tank <br />was removed later in 2011, therefore, this will be the only sample <br />collected at this site. <br />18 <br />