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• than those for the other three seasons. Mean spring and summer HC04 levels ere distinctly <br />higher than the fall and winter levels. Meen TDS concentrations ere lowest in the spring <br />and increase through the summer and fall to about twice the spring levels, then lower in <br />the wLnter period of minimal evaporation end appreciable recher9e. <br />The pH levels for ell the samples et Site YSS2 range from neutral to moderately alkaline. <br />No seasonal trend is evident in the pH. The dissolved Al USGS date looks very suspect es <br />the minimum dissolved Al value still ten times the maximum recent total recoverable AI <br />values obtained et this site. Three other trace metal values, ell analyzed on 9/10/92, <br />have anomalous concentrations end are suspect. They are Al (76 ug/I), Cu (2970 ug/l), and <br />Ni (100 ug/l). Of the 16 principal trace metals analyzed for total end total recoverable <br />analyses, 12, 15, and 11 of the trace metals have uncensored values in the spring, summer, <br />end fall, respectively. Cd levels ere two to three times higher in the summer, Cu levels <br />are highest in the fell, Se levels ere higher in the spring end summer, Ag levels ere <br />higher in the sunnier end fall, and Zn levels ere highest in the summer. <br />Site wSSF3 (see Exhibit 7-1) has been sampled from 10/1/90 through 10/14/93. Two water <br />• types ere exhibited at Site YSSF3, CaNg504HC03, which is the principal water type and <br />CaNgHC03 SO4. A third wafer type, CaNgNL03, can be discounted because it results only <br />because of gross labs retory errors for S04 and HC03 in the 10/14/92 analysis. The <br />trf linear and Schoeller plots shot minimal cation scatter end measurable anion scatter <br />with no overall trend. A majority of the anion scatter is attributable to the S04 and <br />HC03 variability. TDS does not show any overall trend. The mean TDS et this site is <br />approximately 100 mg/t higher than that at the next upstream Site YSS 2. <br />The seasonal trilinear and Schoeller plots show no measurable difference between mean <br />cation percentages. On the anion side, the mean fall S04 and H[03 percent meq/l values <br />ere measurably different (more HC03 and less 504, approximately 14 percent) from those for <br />spring end summer. <br />The pH levels for ell the samples et Site wS SF3 range from slightly alkaline to moderately <br />alkaline. No seasonal trend is evident in [he pH. The 9/70/92 pH value of 3.1 is a Bross <br />laboratory error. Excepting As, Be, B, Fe, Nn, and 2n, a majority of the analyses for the <br />other 11 trace metals ere censored. A seesanaL evaluation of the trace metals shows Cd, <br />Pb, and Se concentrations are higher in the spring and summer end censored in the fall, Hg <br />and Mo ere only detected in the spring end As is only detected in the summer and fell. <br />705 <br />