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Surface Water Monitoring <br />During 1992, quarterly surface water quality and flow analyses were conducted at each <br />of the three stations located on Stollsteimer Creek. These samplings were conducted during <br />March, June, September and December. <br />Methods <br />During visits to each station, flow measurements were made using aTeledyne-Gurley <br />Model 622 current meter. Measurements were made by stretching a 100 foot tape across <br />a surveyed cross-section of the creek and utilizing the USGS six-tenths depth method. Crest <br />gauges, which were established at each station during 1986, were also serviced during each <br />visit to the site. <br />t During samplings for water quality, measurements for temperature, pH and conductivity <br />were made utilizing an Orion Research Model 399A portable pH meter and Hack Model <br />16300 portable conductivity meter. Prior to field sampling, meters were calibrated with <br />' known standards. All other parameters were collected in precharged bottles and submitted <br />to Chemtech Laboratory in Salt Lake City for analyses. Methods of analysis were consistent <br />with EPA standard testing procedures. <br />Results <br />Results of all surface water measurements made during 1985 through 1992 are contained <br />in Appendix 1. A summary of major chemical parameters and flow is presented in Table 1. <br />Flow data collected at the surface stations on Stollsteimer Creek during 1992 varied from <br />4.7 cfs at station S-3 in September to a high of 6.8 cfs at station S-1 in June. Flow was too <br />' high to measure during March and ice conditions prevented flow measurements in <br />December. As indicated from the flow records, 1992 was a typical water year with high <br />flows in the spring and early summer and low flows during fall and winter. Recorded flows <br />' over the eight year period ranged from a low of 0 cfs at station S-1 to a high of 195 cfs at <br />station S-1 in March 1985. Maximum recorded flow was approximately 300 cfs during April <br />1986, which was estimated at the mine haul road culvert crossing. In terms of average flow, <br />1985 was the highest and 1989 was the lowest. Spreadsheets and graphs of flow recorded <br />at each station are presented in Appendix 1. <br />' Surface water chemistry was observed to be stable over the eight year monitoring period <br />(Table 1 and Appendix 1). The water may be classified as a mixed calcium/magnesium- <br />sulfatePoicarbonate type water. The degree of ionization varied with season, being highest <br />' during low flow and lowest during high flow. The ratio of calcium to magnesium was <br />generally consistent over the seasons; however, there is a shift in the ratio of sulfate to <br />bicarbonate, with bicarbonate being more prevalent during high flow conditions. These ionic <br />4 <br />