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March 2014 Mill MLGW -7 Groundwater Quality Assessment ♦ 7 <br />These historical and recent observations suggest that the low pH values observed in <br />MLGW -7 likely are not associated with seepage from the 1 -Dam TSF. Lower pH <br />measurements are observed in other Mill monitor wells (MI.GW -10, MGLW -11, and <br />MLGW -17) that are representative of ambient background conditions. The pH values in <br />MLGW -7 also do not appear to correlate with increased solute or metals concentrations in <br />groundwater. In addition, the fluctuation of pH, in response to drought or wet water years, <br />suggests that the low pH measurements recorded at MLGW -7 and background wells are <br />more consistent with the influence of natural recharge, which has a pH usually below 5.7 <br />(Langmuir, 1997). <br />AJAX Ltd ♦ 28828 Cedar Circle ♦ Evergreen, CO 80439 ♦ (303) 241 -2057 <br />Clear Creek Associates♦ 6155 E. Indian School Rd. ♦ Scottsdale, AZ 85251 ♦ (480) 659 -7131 <br />