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Analyses at the Madrid station indicate aloes-yield watershed with the mean annual runoff volume <br />measured at 28,980 acre feet. <br />• In terms of local water quality of the Purgatoire River and associated alluvium, mine discharge and <br />leachate from refuse contribute to higher ionization of the water and increased amounts of trace <br />elements. The main pazameters of interest are sodium and other dissolved salts which may affect <br />downstream use of the water for irrigation. In the worst case, during low flow conditions, effects of <br />ionization caused by mining are insignificant when compared to the natural deterioration of water <br />quality as the river flows to the east. Figure 3.2-1 presents stiff diagrams of water quality at stations <br />PRS-1 and PRS-4 on the Purgatoire River for November 1997 through 2001. As shown, water quality <br />above the mine is similar to water quality below the mine. <br />Discharge from the site passes through treatment facilities or sediment impoundments. Copies of the <br />NPDES Discharge Monitoring Reports submitted to the Colorado Departrnent of Public Health and <br />Environment are sent to CDMG as they are filed quarterly. No discharges were noted at any of the <br />ponds in 2006. <br />3.2.3 Alluvial Groundwater <br />Wells in the Purgatoire River alluvium, (stations PAW-1 through PAW-9) were monitored during the <br />year. Stiff diagrams of wells PAW-I, PAW-2, PAW-8 and PAW-9 in the alluvium at New Elk are <br />shown in Figure 3.2-2. This shows slight decreases over the past six years in salinity in alluvial ground <br />• water quality in response to decreased mining activity. <br /> <br />16 <br />