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Site YSS4 (see Exhibit 7-7) was monitored from 7/19/79 through 5/73/86. Four water types • <br />ere exhibited et this site, CeHgXC03504, which is the principal water type, CaHgNC03, <br />CeNg504 NC03, end MgCaHC03. The first two water types account for 84 percent of ell the <br />water quality analyses. The trilineer end Schoeller plots show some cation scatter and <br />measurable anion scatter. The cation scatter is mostly due to Ca end Mg veriebility while <br />the anion scatter is principally due to 504 and HC03 veriebility. Though there is no TDS <br />trend overall, there does appear to be en anion trends towards increasing 504 in 7985 and <br />1986. <br />There is no measurable difference among the seasonal mean cation percent meq/l. There is <br />a small difference among the seasonal mean anion percent meq/l with the spring mean <br />showing a higher 504 percenteBe then the other seasons. Seasonal mean TDS levels are <br />similar in the spring and summer and increase approximately 60 to 70 mg/l in the fall end <br />winter. <br />The pH levels for ell samples at Site Y554 range from neutral to moderately alkaline. <br />Excepting one Pb, Hg, and Hi value, dissolved concentrations for Al, 5b, As, Ba, Cd, Cr, <br />Cu, Mo, Se, end Ag ere all censored. Because a majority of the total analyses for Pb, Hg, • <br />and Ni ere also censored, the three uncensored dissolved analyses, which ere right at the <br />detection limits, ere considered suspect. Excepting Al, B, Fe, Mn, Ag, end Zn, a majority <br />of the total analyses for the other eleven trace metals are censored. A seasonal <br />evaluation of the trace metals indicates total Ba and Cu ere only uncensored in the spring <br />end fel L, total Cd, Pb, Hg, and Se ere only uncensored in the summer and fell, end total <br />As is uncensored in the summer end winter seasons. Because totals analyses incorporate a <br />rigorous acid digestion step as part of the analysis, trace metal concentrations leached <br />from the suspended sediment portions of the samples can be quite variable (depending on <br />the silt/clay, high cation exchange capacity fraction of the sediment) and not <br />particularly meaningful. Suspended solids concentrations as high as 2700 mg/l were <br />determined as pert of the water quality analyses at Site YSS4. This undoubtedly <br />contributed to the high Al, As, end Fe concentrations measured. Site YSS F3 has replaced <br />this site as a lower Sage Creek monitoring station. <br />Y-1 Tributary. Site YS53 is located above Dond Y-1 on the Y-7 tributary to Sage Creek <br />(see Exhibit 7-7). This site has been monitored from 5/1/91 through 70/14/93. Five water <br />types are exhibited at Site TSS3, HBCe504HC03, which is the principal water type, MpCaSO4, <br />Mg504, MgCaXC03504, and MBSO4HC03. MgCaSO4HC03 and MOCe504 account for 67 percent of all <br />the water quality analyses at this site. The trilineer end Schoeller plots show <br />106 <br />