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<br />' Mani[orinp Resuf[s <br />' Surface water chemistry was observed to be stable over the twelve year monitoring period <br />(Table 1 and Appendix n. The water may be classified as a mixed calcium/magnesium-sul- <br />fate/bicarbonate 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 in 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. All NPDES forms were <br />filed with the Colorado Department of Public Health and Environment during quarterly reporting <br />periods. CDMG also received copies of these reports. Results of the annual pond survey <br />conducted in October 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 and fourth quarters. All data is contained in Appendix II. <br />Water levels in well A-1 varied seasonally. W-1 and W-5 were dry for all of the four quarters of <br />' monitoring. <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 1996 were consistent with previous years. <br />1 <br /> <br />1 <br />' 199G.OSlq/01~?0-97(11'OSam) 6 <br />