1989-03-23_REPORT - C1981012 (2)

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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 1988 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 four 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 and fluoride. These elevated levels indicate that mine discharge to Ciruela Canyon is being detected at PAW-6 . Water quality at PAW-6 has been stable over the four year monitoring period. Alluvial well PAW-7 was installed on September 1 , 1988 down- gradient of the proposed Pond 005. Data collected is presented in Table 2-7 of Appendix 1 . Water levels were between 6 and 7 feet below the surface and quality parameters indicate that the water is a mixed calcium-sodium/bicarbonate type with elevated conductivities and low metals. Data collected at the canyon well stations ( CCAW-1 and ACAW-1 ) is presented in Table 2-8 of Appendix 1 . No data was collected at well ACAW-1 . Data collected at well CCAW-1 was consistent with previous samplings. 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 -18-