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tenths depth method. In the office, cross-sections were drawn to <br />assess changes in the stream bed configuration and flows were <br />calculated. Crest gauges, which were established at each station <br />during 1986, were serviced during each visit to the site. <br />I During quarterly samplings for water quality, measurements <br />for temperature, pH and conductivity were made utilizing an Orion <br />Research Model 399A portable pH meter and Hack Model 16300 <br />portable conductivity meter. Prior to field sampling, meters were <br />I calibrated with known standards. All other parameters were <br />collected in precharged bottles and submitted to Chemtech <br />Laboratory in Salt Lake City for analyses. Methods of analysis <br />were consistent with EPA standard testing procedures. <br />Results <br />Results of all surface water measurements made during 1985 <br />through 1987 are contained in Appendix 1. A summary of major <br />chemical parameters and flow is presented in Table 1. <br />Flow data collected at the surface stations on Stollsteimer <br />1 Creek during 1987 varied from a low of 2.63 cfs at station S-1 in <br />1 October to a high of 115 cfs at station S-1 in April. High flow <br />crest events were recorded at all three stations during March and <br />April and a crest event at station S-2 in May only. Over the <br />three year period, highest flow was approximately 300 cfs during <br />April, 1986 which was estimated at the main haul road culvert at <br />the mine. Recorded flows over the three year period ranged from a <br />low of 2.63 cfs at Station S-1 in October 1987 to a high of 195 <br />cfs at station S-1 in March, 1985. In terms of average flow, 1985 <br />was the highest and 1986 was the lowest. Spreadsheets and graphs <br />' of flow recorded at each station are presented in Appendix 1. <br />Generally, the high flow occurs during March or April with low <br />flow during July and October. <br />` Surface water chemistry was observed to be stable over the <br />three year monitoring period (Table 1 and Appendix 1). The water <br />I may be classified as a mixed calcium/magnesium-sulfate/bicarbonate <br />type water. The degree of ionization varied with season, being <br />highest during low flow and lowest during high flow. The ratio of <br />calcium to magnesium was generally consistent over the year, <br />I however, there was a shift in the ratio of sulfate to bicarbonate, <br />with bicarbonate being more prevalent during high flow conditions. <br />These ionic conditions also influenced the conductivity and TDS as <br />i exhibited in the graphs in Appendix I. <br />