Laserfiche WebLink
The 1997 NO3 for well P-3 was 45 mg/l and the only 1997 NO3 value above the <br />drinking water standard of 10 mgA. This value is similar to values observed in this well prior <br />to mining in this area and, therefore, the 1997 value is within the natural range for this well. <br />3.6 OTHER CONSTITUENTS <br />The major constituents other than calcium and magnesium are presented on <br />pages B-93 through B-120. An overall decrease in the calcium and magnesium <br />concentrations has been observed since 1985 for wells GB-5 and GE-2 with present <br />concentrations being very small. A decreasing trend in sodium had been observed at well <br />GP-6 until a small increase in 1997. Declines in sodium concentrations at well GF-7 <br />stopped in 1997 with the 1996 and 1997 values being fairly similar. <br />The heavy metals with a "t" subscript by their symbol represent total <br />measurements, while the others are dissolved concentrations. Dissolved and total <br />concentrations are similar for most of the heavy metals, except for iron concentrations in <br />some wells where the total values are significantly greater in some wells. <br />Iron concentrations have varied over large ranges near the mine pits and at <br />distant wells but no consistent trends have been observed. Levels of aluminum, barium, <br />boron, phosphate and manganese have also varied over significant ranges but no <br />consistent trends have been observed. Arsenic, cadmium, chromium, copper and lead <br />concentrations have been low with a few exceptions. Copper concentrations in wells G8-5 <br />and GE-3 have been higher mainly prior to mining. A few early lead concentrations in wells <br />3-12 <br /> <br />