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Historical Field Data <br />Harvey Gap-Above Mine-pH <br />Year Max Min Avg Std <br />1996 8.2 7.2 7.6 12.9 <br />1997 8.3 7.5 7.9 0.3 <br />1998 8.0 7.0 7.6 0.4 <br />1999 8.0 7.0 7.6 0.3 <br />2000 8.0 6.5 7.4 0.5 <br />2001 7.5 6.5 6.8 0.3 <br />2002 7.5 6.5 7.0 0.4 <br />Harvey Gap-Below Mine-pH <br />Yeaz Max Min Avg Std <br />1996 8.4 7.2 7.6 12.9 <br />1997 8.4 7.5 7.9 0.3 <br />1998 8.0 7.0 7.5 0.4 <br />1999 8.0 7.0 7.4 0.4 <br />2000 8.0 6.5 7.5 0.5 <br />2001 7.5 6.5 6.8 0.3 <br />2002 7.5 6.5 7.2 0.3 <br />Page 12 of 22 <br />