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that was how sampling depth was selected. After a period of time, the aquifer data was <br />• expected to reflect characteristics of aquifers at other monitoring locations. Tables 6-11, 6-12, <br />6-13, 6-14, and 6-15 summarize water quality data for period of record. <br />Data from the Dissolution Surface well IRI-7 indicate lower than typical (compared to other <br />NSI wells) concentration, with TDS of 14,100 mg/I and conductivity of 16,300 umhos/cm <br />recorded in May of 2003. An increase over the past thirteen years of TDS, conductivity, <br />and other parameters of the Dissolution Surface aquifer WQ indicates a trend toward <br />typical Dissolution Surface WQ. <br />The B-Groove data indicated moderate TDS (930 mg/I), conductivity (1300 umhos/cm), and <br />high fluoride (22.2 mg/l) as of May 2003 and is characteristic of similar aquifers found at <br />• other monitoring locations. IRI-5 (Perched aquifer) had a conductivity of 862 umhos/cm, <br />fluoride of 0.2 mg/l, and TDS of 610 mg/I in May 2003, which was typical of perched <br />aquifers. The A-Groove at the maxi-pad has historically indicated effects of commingling or <br />completion problems. <br />WQ for A-Groove well IRI-4 indicated conductivity of 1010 umhos/cm, pH of 9.3, and <br />fluoride of 6.5 mg/I in May 2003. Because of the high pH in the A-Groove (IRI-4), an air <br />compressor was used in 2000 to "air lift" samples from the well to remove contaminated <br />water and provide more characteristic WQ. As a result of air lifting, conductivity and pH are <br />within normal range, however fluoride was still lower than normal but increased during <br />2003. No WQ effects are evident from mining activity other than recompilation action. <br />60 <br />