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Late in 1993, WQ changed significantly and was characteristic of a mixture with mine water <br />resulting from affects of pressurized mining. Most WQ parameters peaked in early 1994 and <br />declined from late 1994 to mid 1995 as a result of water used during recompletion in July <br />1994. to 1995-1998 most WQ parameters returned to high concentrations similar to late <br />1993 and early 1994 WQ. No significant trend in WQ was noted in 2003 to indicate <br />continued mining effects or a return to historical WQ. Bicarbonate and fluoride results <br />indicate no significant change since 1996 when submersible pumps were utilized in <br />recovery wells. Although there was no trend, bicarbonate and fluoride remain higher than <br />baseline. Chloride results indicate no significant trend since decline in 1998, with range of <br />data more consistent and concentration slightly less than baseline. <br />No trend or significant water quality change was noted for the Perched, A-Groove and B- <br />• Groove monitoring well aquifers. For example, see Figure 6-5 for conductivity results of B- <br />Groove well (89-1 ). Conductivity results from the B-Groove are consistent showing a slight <br />downward trend, similar to other WQ parameters through this period of record. <br />In November of 1994 WQ effects were noted in the A-Groove water well (90-1 ), which <br />supplies the plant with raw water. As a result of analysis submitted to regulatory agencies, <br />the dewatering effect caused by a cone of depression around 90-1 combined with <br />pressurized effect of mining without submersible pumps caused the effect on the water well <br />90-1. <br />I• <br />