1990-03-27_REPORT - C1981013 (5)

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Wet Canyon (WCS-1) to gather baseline data for those drainages. At each station, a staff and crest gauge were installed to gather base and peak flow events. These stations are monitored monthly. During 1989 monitoring of these three stations, stations CHC-1 and LCS-1 were dry. Also, no crest events were recorded at these two stations. Station WCS-1 exhibited a base flow condition. No peak flow events were recorded at WCS-1 during the year. All data collected at these stations is presented in Tables 1-11, 1-12 and 1-13 of Appendix 1. Data collected over the two years in which the stations have been monitored is contained in Table 1-14. 3 . 2 Ground Water Seven wells in the Purgatoire River alluvium and one well in Ciruela Canyon were monitored quarterly during 1989. Generally, wells within the Purgatoire alluvium responded directly to the level of water in the river. The well in Ciruela Canyon responded primarily to precipitation received in the drainage. All data is contained in Table 2-1 through 2-8 of Appendix 1. Table 2-9 summarizes all data collected over the previous five years of monitoring. Wells PAW-1 and PAW-2 were established to monitor the existing refuse pile at the New Elk Mine. The summary presented in Table 2-9 indicates some differences in water quality between the two wells. PAW-2 has a higher ionization of the water and higher concentrations of TDS, conductivity, iron, manganese, sodium, sulfate, calcium, magnesium and bicarbonate. PAW-1 is a calcium-bicarbonate water. Water in PAW-2 is a mixed calcium/sodium-bicarbonate type. Metals analyzed for PAW-1 were near or below detection limits while iron and manganese was elevated at station PAW-2 . These elevated levels indicate that the coal refuse is leaching into the alluvial aquifer. -17-