Laserfiche WebLink
considered a calcium sulfate/bicarbonate type with a more stable ionic condition <br />than the surface waters of the creek. Trace metal concentrations of arsenic, <br />cadmium, lead, mercury and selenium were at or below detection limits while <br />aluminum, iron, manganese and zinc were present in acceptable quantities. <br />Extreme levels of these latter four parameters were detected at Station W-1 in <br />October. A possible reason for those levels may be that the sample was <br />contaminated by sediments in the bottom of the well as only a small quantity of <br />water was available. <br />The well at station W-7 is a domestic water supply at a residence above <br />the mine site. During the year no access to the well could be obtained. <br />Deep wells were sampled at stations W-6, W-9, W-iD, W-17 and W-18. <br />The general water level fluctuation cycle of these wells was an increase in level <br />from January through June, a decrease from July through October and a slight <br />increase in November and December (Appendix 2). Stations W-6 and W-18 <br />exhibited the greatest fluctuations ranging nearly 16 and 18 feet, respectively <br />(Table 1). Water quality of the deep wells was similar to that of the surface and <br />alluvial waters. The waters were a calcium sulfate/bicarbonate type, however , <br />exhibited higher concentrations of iron, manganese, zinc and ammonia. <br />Chemical parameters were relatively stable over the year with greater <br />ionization as water levels were lower. Some of the parameters such as iron and <br />ammonia exhibited high concentrations during certain sampling events. Reasons <br />for these spikes are not known. Conductivity and TDS of well W-17 were also <br />higher than other wells. <br />Station W-16 is located in the reclaimed area. Water level remained <br />relatively stable over the monitoring period ranging from 93 1/8" in July to 96.8 in <br />January. Water quality was consistent with other wells sampled with somewhat <br />higher concentrations of iron and manganese. <br />9 <br />