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• The ephemeral discharge from the proposed permit area has been <br /> observed during water sample collection by CYCC personnel during the <br />1979 and 1980 floe seasons. Flw in the proposed permit area <br />results from spring anowmelt and occasional rainstorm runoff, where <br />dry conditions usually predominate. <br />Seasonal Variations in Water Quality <br />The description of seasonal variations in surface water quality <br />is based on grab samples taken by CYCC personnel. All samples were <br />analyzed according to EPA and ASTM standards. Temperature, pH, <br />dissolved ozygen, and electrical conductivity were measured in the <br />field with electrode meters. Grab samples were collected for <br />analysis of all other parameters listed in Exhibit 15, Hydrologic <br />Monitoring Flan. The collected data is listed in Table 29, Surface <br />Water Quality Data. The surface water chemistry shown on Figure 9, <br />Surface Water Quality Trilinear Diagram, is predominantly calcium <br />bicarbonate with lesser concentrations of magnesium and sulfate. <br />Bepreaentative data were assimilated from sites upstream and <br />downstream from Mine No. 3 on Middle and Fish Creeks to demonstrate <br />seasonal water quality variations. Seasonal quality variations at <br />any one sample site were found to be directly related to the amount <br />sad intensity of flow, as shown in Figure 11, Eunoff vs. slater <br />Quality. Aa flaw increases, amount of suspended constituents (ie., <br />sediment, total iron and total manganese) increases proportionately. <br />Concentrations of dissolved constituents, on the other hand decrease <br />• with higher flows due to dilution. <br />2.04-51 <br />