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• appreciable cation and anion scatter with no ova rail trends. The cation scatter is due to <br />variability in the percent meq/l levels of Ce, MB, end Na, while the anion scatter is due <br />to variability in NC03 and 804 percent meq/l levels. TDS shows no overall trend, but <br />reaches concentration levels in 1993 that ere twice as high es any measured in 1991 and <br />1992. <br />The seasonal mean trilinear and Schoeller plats show the cations have a higher pereentege <br />of Ce in the spring es compered to the summer end fall. The anions show a higher mean <br />percent S04 in the fall as compared to the spring end summer seasons. TDS appears to <br />increase in early spring, decrease into late spring, and then increase throughout the <br />summer and fall. The mean summer TDS concentration is 62 percent higher then the mean <br />spring level and the mean fell concentration is 45 percent higher then the mean summer <br />level. <br />the pN is similar to that at the monitoring sites discussed so far, ranging from slightly <br />to moderately alkaline conditions. Excepting AL, Be, B, Fe, Mn, and 2n, a majority of the <br />rest of the other ten trace metal analyses are censored. A seasonal evaluation of the <br />• other trace metals shows uncensored Cr, Cu, Pb, Ng, Mo, Ni, Se, end Ag levels were <br />measured only in the spring. Uncensored Al, As, Be, B, Fe, Mn, and Zn levels have been <br />recorded in ell three seasons end uncensored levels of Cd have been measured in the spring <br />end summer only. <br />Site YSSF2 is located below Pond Y-1 on the Y-1 tributary to Sege Lreek (see Exhibit 7-1). <br />This site has been monitored from 3/11/91 through 9/14/93. Three water types ere <br />exhibited at Site YSSF2, MgCa504NC03 which is the principal water type, Ng[e504, end <br />Mg504. The first two water types account for 89 percent of ell the water quality analyses <br />at this site. The trilinear and Schoeller plots show appreciable cation end anion scatter <br />with no overall trends. The cation scatter is largely due to Ca end Mg percent meq/l <br />variability, while the anion scatter is principally due to NC03 and S04 percent meq/l <br />variability. TOS shows no overall trend. <br />The seasonal mean trilinear and Schoeller plots show Ce meq/L percentages ere higher in <br />the spring and lower in the summer, whereas Na end MB meq/L percentages increase in the <br />summer. On the anion side, the summer water quality has a distinctly higher S04 meq/l <br />percentage. The mean TDS concentration for the spring is 587 mg/l. The one summer TDS <br />value is 69 percent greater than the spring mean. <br />107 <br />