PERMFILE46234 - Laserfiche WebLink

Home Browse Search

• site. The trilinear end Schoeller plots show minimal cation scatter end measurable anion scatter. The anion scatter ie largely due to 504 end NC03 percentage vertability. iDS shows no overall trends, but appears to increase in early spring, then decrease into April and Ney and increase in the summer. Fell TDS levels appear to be comparable to summer levels. The seasonal mean trilinear end Schoeller plots show the cation date is very similar with only a slight increase in Ne in the winter. The mean seasonal anion data show two groupings of data. The summer and fell anion plots have a higher percentage of HC03 end the spring end winter date show a higher percentage of 504. The mean seesonaL TDS date shoal en increase in concentration from spring to winter. The pX of the water ranges from slightly alkaline to moderately alkaline (7.9 to 8.7) with no seasonality. Excepting Al, Be, Fe, Nn, and Zn, a majority of the rest of the other ten trace metals analyzed for total recoverable concentrations are censored. A seasonal evaluation of the trace metals shows Cr levels ere always censored regardless of the season. Al, As, Ba, Cd, Cu, Fe, Nn, end Zn show some uncensored values in each season. Mo and Se are • uncensored in the spring end summer, but not int he fall. Hg, Ni, end Ag ere uncensored only in the summer and Pb is censored only in the summer. the summer Cu value of 1040 ug/I is a gross lab error. All other Cu measurements ere right et, near, or below the detection Limit of 10 ug/l. ' Surface Vater Suitabi lity. Potential surface water suitability in the proposed permit area and adjacent drainages was evaluated by compering analyte concentrations from the nine stream monitoring sites along Sege and Grassy Creeks and select tributaries to the three categories of water quality standards: 1) domestic drinking; 2) irrigation; and 3) livestot k. Domestic, irrigation, end livestock standards are compared to the baseline surf eee water quality in Sage Creek, Grassy Creek, Annand Drew, and the T-1 tributary to Sage Creek to determine if they exhibit any water use potential that would need to be protected and to define the type of surface water quality that spoil spring discharges and mined lend surface runoff will be misine with. The domestic standards consist of EPA end CDOH criteria (see Table 7-34). Irrigation standards consist of CDON criteria and parameter • limits recommended by California State Water Resources Control Board (1963), Food and Agricultural Organization of the United Nations (Kandish, A., 1987), end CMLRD (1988) (see Table 7-35). Livestock standards consist of CDOH criteria end parameter limits 109 Revised 03/01/95