Laserfiche WebLink
<br />1 MonilorinR Resufls <br />' Surface water chemistry was observed to be stable over the thirteen year monitoring period <br />(Table 1 and Appendix I). The water may be classified as a mixed calcium/magnesium-sul- <br />fatelbicarbonate type water. The degree of ionization varied with season, being highest during <br />' low flow and lowest during high flow. The ratio of calcium to magnesium was generally <br />consistent over the seasons; however, there is a shift th the ratio of sulfate to bicarbonate, with <br />bicarbonate being more prevalent during high flow conditions. These ionic conditions also <br />influenced the conductivity and TDS as exhibited in the graphs in Appendix I. <br />' Analysis of trace metals indicates low concentrations. Aluminum and iron were detected in all <br />samplings, higher values being reported during high flow events (Appendix I). Manganese and <br />zinc were also sampled and found in only trace amounts. <br />' Mining and reclamation operations at the Chimney Rock Mine appear to have little or no effect <br />on the quantity or quality of area surface waters. This may be due to the mines inactive status <br />' during 1985 through 1989. Backfill and grading activities occurred in the Revision 1 Pit and <br />Surface facilities during 1990 and 1991; however, sediment control ponds established on the <br />disturbed areas eliminated runoff of surface waters from the mine site. These ponds were removed <br />in the fall of 1997. All NPDES forms were filed with the Colorado Department of Public Health <br />and Envirotunent during quarterly reporting periods. CDMG also received copies of these <br />reports. Results of the pond surveys conducted for the first two quarters of the year prior to pond <br />' removal are contained in Appendix III. <br />' GROUNDWATER <br />The three alluvial wells A-1, W-1 and W-5 were replaced and added to the monitoring program <br />' in 1993. Water levels were measured during the quarterly samplings with water chemistry being <br />analyzed during the second quarter. All data is contained in Appendix II. <br />Water levels in all wells varied seasonally. The spring season showed higher alluvial water levels <br />than normal. All wells had water over the entire monitoring period. <br />' Water quality was analyzed from well A-1. The water is considered a mixed ion <br />calcium/magnesium-sulfate bicarbonate type. Historically, well A-1 has a higher ion concentration <br />than well W-5 as exhibited by the values of conductivity, TDS, and cation anion analysis. Sodium <br />' and magnesium concentrations were also higher in well A-1. Water quality analyses conducted <br />in 1997 were consistent with previous years. <br /> <br />1 <br /> <br />' 1997.05}/}/01-22-98(8'.32am) 6 <br />