1988-06-17_REPORT - C1981012 (2)

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alluvial wells have been established to monitor water elevation and chemical parameters. Monitoring began in April of 1985 with the data presented in Tables 2-3 and 2-4 of Appendix 1 for stations PAW-3 and PAW-4 , respectively. The wells were cased with 18 inch galvanized CMP and completed in the cobble an gravel fill of the channel. Total depth of PAW-3 is approximately 20 feet from the top of the casing. Total depth of PAW-4 is approximately 15 feet from the top of the casing. Static water level in both wells corresponds closely with static water level in the Purgatoire River. Water quality monitoring shows water in these wells to be a mixed calcium/sodium-bicarbonate type water similar to the well monitored at PAW-2 (Table 2-9) . Wells PAW-5 and PAW-6 were established to monitor the Golden Eagle Mine. Data collected during 1987 are presented in Tables 2-5 and 2-6. Analyses of all water chemistry parameters at PAW-5 were similar to those of PAW-1 indicating negligable effects of the New Elk Mine on the Purgatoire alluvium. Table 2-9 presents the range and mean for all parameters measured during the previous three years of monitoring. The major differences observed in the two stations was that the water in PAW-5 is a calcium-bicarbonate type while that of PAW-6 is more a sodium-bicarbonate type. PAW-6 had a higher ionic concentration and higher levels of pH, conductivity, TDS, TSS, TCS, sodium, bicarbonate, chloride, sulfate, iron and fluoride. These elevated levels indicate that mine discharge to Ciruela Canyon may be being detected at PAW-6. Water quality at PAW-6 has been stable over the four year monitoring period. 3. 3 Hydrologic Consequence Analysis of potential impacts associated with mining and refuse disposal have been completed and are contained in the mine permit application. Of particular concern are changes in the water quality and quantity of the Purgatoire River and side canyons within the permit and adjacent areas. 16