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. drainage, the eater quality discussion will progress from the most updreinage site to the <br />furthest downgredient site. <br />Sage Creek. Site YSS1 (upper Sage Creek, see Exhibit 7.1) was monitored for aster quality <br />from 8/28/80 to 9/15/82. Two water types are exhibited at Site YSS1, CaMgHC03, which is <br />the principal water type, and MgCaHC03. The trilinear end Schoeller plots shoo <br />appreciable cation scatter with a trend towards increasing Ca in 1981 and 1982. The plots <br />also shoo some anion scatter. Nost of the anion scatter appears to be due to 504 and HC03 <br />variability between analyses. Besides some seasonal variability, factors contributing to <br />cation and anion scatter are: 1) S04 interference of 1CP measurement of Ce and Mg; 2) S <br />loss from samples prior to analysis; end 3) samples saturated or supersaturated with <br />gypsum or have significant amounts of HC03 will likely lose some of the original dissolved <br />carbonate and S04 species to precipitation prior to laboratory analysis. TDS does not <br />appear to show any overall trend. <br />The seasonal mean trilinear and Schoeller plots show mean cation data for summer and fall <br />to be very similar, chile that for spring has a measurably higher Ca percentage. Mean <br />• summer 504 meq/I values are lower while spring and fall values are equivalent. Mean HC03 <br />meq/L values in the spring are lower, end higher in the summer and fall. Mean summer and <br />fall meq/l levels of HC03 are comparable. Mean TDS levels ere Lower in the spring and <br />increase in the summer. Mean summer and fall TDS levels are comparable. <br />The pH levels for all samples range from neutral to moderately alkaline. If there is any <br />seasonal effect, the pH trends towards more alkaline conditions from spring to the fall. <br />Monitoring was discontinued at this site in 7982 and only total Lrace metal concentrations <br />were determined. Excepting B, Fe, Mn, Hg, and Zn a majority of the other trace metal <br />total analyses were censored. Total As, Sb, Ba, Pb, Mo, and Se were always censored. The <br />one uncensored Ag value appears to be a lab error. Cd and Cr are only present et <br />detectable concentrations in the spring. Al is uncensored in the summer and fell and Cu <br />and Ni are only uncensored in the fall. The amount and type of suspended sediment <br />collected with the water quality sample can also affect the total concentration analyses <br />of trace metals. If the sediment contains higher percentages of silt and clay, there is a <br />greater potential for higher concentrations of trace metals to be leached off the sediment <br />during the acid digestion end preservation steps of the totals analysis. <br />• Site YSSF3 (see Exhibit 7-1) has been monitored from 11/14/90 through 10/14/93. Two water <br />types are exhibited at Site YSSF3, CaMgHL03, which is the principal water type, and <br />103 Revised 05/23/95 <br />